/*- * Copyright (c) 2003-2007 Tim Kientzle * Copyright (c) 2011-2012 Michihiro NAKAJIMA * Copyright (c) 2016 Martin Matuska * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "archive_platform.h" __FBSDID("$FreeBSD$"); #ifdef HAVE_ERRNO_H #include #endif #include #ifdef HAVE_STDLIB_H #include #endif #ifdef HAVE_STRING_H #include #endif #include "archive.h" #include "archive_acl_private.h" /* For ACL parsing routines. */ #include "archive_entry.h" #include "archive_entry_locale.h" #include "archive_private.h" #include "archive_read_private.h" #define tar_min(a,b) ((a) < (b) ? (a) : (b)) /* * Layout of POSIX 'ustar' tar header. */ struct archive_entry_header_ustar { char name[100]; char mode[8]; char uid[8]; char gid[8]; char size[12]; char mtime[12]; char checksum[8]; char typeflag[1]; char linkname[100]; /* "old format" header ends here */ char magic[6]; /* For POSIX: "ustar\0" */ char version[2]; /* For POSIX: "00" */ char uname[32]; char gname[32]; char rdevmajor[8]; char rdevminor[8]; char prefix[155]; }; /* * Structure of GNU tar header */ struct gnu_sparse { char offset[12]; char numbytes[12]; }; struct archive_entry_header_gnutar { char name[100]; char mode[8]; char uid[8]; char gid[8]; char size[12]; char mtime[12]; char checksum[8]; char typeflag[1]; char linkname[100]; char magic[8]; /* "ustar \0" (note blank/blank/null at end) */ char uname[32]; char gname[32]; char rdevmajor[8]; char rdevminor[8]; char atime[12]; char ctime[12]; char offset[12]; char longnames[4]; char unused[1]; struct gnu_sparse sparse[4]; char isextended[1]; char realsize[12]; /* * Old GNU format doesn't use POSIX 'prefix' field; they use * the 'L' (longname) entry instead. */ }; /* * Data specific to this format. */ struct sparse_block { struct sparse_block *next; int64_t offset; int64_t remaining; int hole; }; struct tar { struct archive_string acl_text; struct archive_string entry_pathname; /* For "GNU.sparse.name" and other similar path extensions. */ struct archive_string entry_pathname_override; struct archive_string entry_linkpath; struct archive_string entry_uname; struct archive_string entry_gname; struct archive_string longlink; struct archive_string longname; struct archive_string pax_header; struct archive_string pax_global; struct archive_string line; int pax_hdrcharset_binary; int header_recursion_depth; int64_t entry_bytes_remaining; int64_t entry_offset; int64_t entry_padding; int64_t entry_bytes_unconsumed; int64_t realsize; int sparse_allowed; struct sparse_block *sparse_list; struct sparse_block *sparse_last; int64_t sparse_offset; int64_t sparse_numbytes; int sparse_gnu_major; int sparse_gnu_minor; char sparse_gnu_pending; struct archive_string localname; struct archive_string_conv *opt_sconv; struct archive_string_conv *sconv; struct archive_string_conv *sconv_acl; struct archive_string_conv *sconv_default; int init_default_conversion; int compat_2x; int process_mac_extensions; int read_concatenated_archives; int realsize_override; }; static int archive_block_is_null(const char *p); static char *base64_decode(const char *, size_t, size_t *); static int gnu_add_sparse_entry(struct archive_read *, struct tar *, int64_t offset, int64_t remaining); static void gnu_clear_sparse_list(struct tar *); static int gnu_sparse_old_read(struct archive_read *, struct tar *, const struct archive_entry_header_gnutar *header, size_t *); static int gnu_sparse_old_parse(struct archive_read *, struct tar *, const struct gnu_sparse *sparse, int length); static int gnu_sparse_01_parse(struct archive_read *, struct tar *, const char *); static ssize_t gnu_sparse_10_read(struct archive_read *, struct tar *, size_t *); static int header_Solaris_ACL(struct archive_read *, struct tar *, struct archive_entry *, const void *, size_t *); static int header_common(struct archive_read *, struct tar *, struct archive_entry *, const void *); static int header_old_tar(struct archive_read *, struct tar *, struct archive_entry *, const void *); static int header_pax_extensions(struct archive_read *, struct tar *, struct archive_entry *, const void *, size_t *); static int header_pax_global(struct archive_read *, struct tar *, struct archive_entry *, const void *h, size_t *); static int header_longlink(struct archive_read *, struct tar *, struct archive_entry *, const void *h, size_t *); static int header_longname(struct archive_read *, struct tar *, struct archive_entry *, const void *h, size_t *); static int read_mac_metadata_blob(struct archive_read *, struct tar *, struct archive_entry *, const void *h, size_t *); static int header_volume(struct archive_read *, struct tar *, struct archive_entry *, const void *h, size_t *); static int header_ustar(struct archive_read *, struct tar *, struct archive_entry *, const void *h); static int header_gnutar(struct archive_read *, struct tar *, struct archive_entry *, const void *h, size_t *); static int archive_read_format_tar_bid(struct archive_read *, int); static int archive_read_format_tar_options(struct archive_read *, const char *, const char *); static int archive_read_format_tar_cleanup(struct archive_read *); static int archive_read_format_tar_read_data(struct archive_read *a, const void **buff, size_t *size, int64_t *offset); static int archive_read_format_tar_skip(struct archive_read *a); static int archive_read_format_tar_read_header(struct archive_read *, struct archive_entry *); static int checksum(struct archive_read *, const void *); static int pax_attribute(struct archive_read *, struct tar *, struct archive_entry *, const char *key, const char *value, size_t value_length); static int pax_attribute_acl(struct archive_read *, struct tar *, struct archive_entry *, const char *, int); static int pax_attribute_xattr(struct archive_entry *, const char *, const char *); static int pax_header(struct archive_read *, struct tar *, struct archive_entry *, struct archive_string *); static void pax_time(const char *, int64_t *sec, long *nanos); static ssize_t readline(struct archive_read *, struct tar *, const char **, ssize_t limit, size_t *); static int read_body_to_string(struct archive_read *, struct tar *, struct archive_string *, const void *h, size_t *); static int solaris_sparse_parse(struct archive_read *, struct tar *, struct archive_entry *, const char *); static int64_t tar_atol(const char *, size_t); static int64_t tar_atol10(const char *, size_t); static int64_t tar_atol256(const char *, size_t); static int64_t tar_atol8(const char *, size_t); static int tar_read_header(struct archive_read *, struct tar *, struct archive_entry *, size_t *); static int tohex(int c); static char *url_decode(const char *); static void tar_flush_unconsumed(struct archive_read *, size_t *); int archive_read_support_format_gnutar(struct archive *a) { archive_check_magic(a, ARCHIVE_READ_MAGIC, ARCHIVE_STATE_NEW, "archive_read_support_format_gnutar"); return (archive_read_support_format_tar(a)); } int archive_read_support_format_tar(struct archive *_a) { struct archive_read *a = (struct archive_read *)_a; struct tar *tar; int r; archive_check_magic(_a, ARCHIVE_READ_MAGIC, ARCHIVE_STATE_NEW, "archive_read_support_format_tar"); tar = (struct tar *)calloc(1, sizeof(*tar)); if (tar == NULL) { archive_set_error(&a->archive, ENOMEM, "Can't allocate tar data"); return (ARCHIVE_FATAL); } #ifdef HAVE_COPYFILE_H /* Set this by default on Mac OS. */ tar->process_mac_extensions = 1; #endif r = __archive_read_register_format(a, tar, "tar", archive_read_format_tar_bid, archive_read_format_tar_options, archive_read_format_tar_read_header, archive_read_format_tar_read_data, archive_read_format_tar_skip, NULL, archive_read_format_tar_cleanup, NULL, NULL); if (r != ARCHIVE_OK) free(tar); return (ARCHIVE_OK); } static int archive_read_format_tar_cleanup(struct archive_read *a) { struct tar *tar; tar = (struct tar *)(a->format->data); gnu_clear_sparse_list(tar); archive_string_free(&tar->acl_text); archive_string_free(&tar->entry_pathname); archive_string_free(&tar->entry_pathname_override); archive_string_free(&tar->entry_linkpath); archive_string_free(&tar->entry_uname); archive_string_free(&tar->entry_gname); archive_string_free(&tar->line); archive_string_free(&tar->pax_global); archive_string_free(&tar->pax_header); archive_string_free(&tar->longname); archive_string_free(&tar->longlink); archive_string_free(&tar->localname); free(tar); (a->format->data) = NULL; return (ARCHIVE_OK); } /* * Validate number field * * This has to be pretty lenient in order to accommodate the enormous * variety of tar writers in the world: * = POSIX (IEEE Std 1003.1-1988) ustar requires octal values with leading * zeros and allows fields to be terminated with space or null characters * = Many writers use different termination (in particular, libarchive * omits terminator bytes to squeeze one or two more digits) * = Many writers pad with space and omit leading zeros * = GNU tar and star write base-256 values if numbers are too * big to be represented in octal * * Examples of specific tar headers that we should support: * = Perl Archive::Tar terminates uid, gid, devminor and devmajor with two * null bytes, pads size with spaces and other numeric fields with zeroes * = plexus-archiver prior to 2.6.3 (before switching to commons-compress) * may have uid and gid fields filled with spaces without any octal digits * at all and pads all numeric fields with spaces * * This should tolerate all variants in use. It will reject a field * where the writer just left garbage after a trailing NUL. */ static int validate_number_field(const char* p_field, size_t i_size) { unsigned char marker = (unsigned char)p_field[0]; if (marker == 128 || marker == 255 || marker == 0) { /* Base-256 marker, there's nothing we can check. */ return 1; } else { /* Must be octal */ size_t i = 0; /* Skip any leading spaces */ while (i < i_size && p_field[i] == ' ') { ++i; } /* Skip octal digits. */ while (i < i_size && p_field[i] >= '0' && p_field[i] <= '7') { ++i; } /* Any remaining characters must be space or NUL padding. */ while (i < i_size) { if (p_field[i] != ' ' && p_field[i] != 0) { return 0; } ++i; } return 1; } } static int archive_read_format_tar_bid(struct archive_read *a, int best_bid) { int bid; const char *h; const struct archive_entry_header_ustar *header; (void)best_bid; /* UNUSED */ bid = 0; /* Now let's look at the actual header and see if it matches. */ h = __archive_read_ahead(a, 512, NULL); if (h == NULL) return (-1); /* If it's an end-of-archive mark, we can handle it. */ if (h[0] == 0 && archive_block_is_null(h)) { /* * Usually, I bid the number of bits verified, but * in this case, 4096 seems excessive so I picked 10 as * an arbitrary but reasonable-seeming value. */ return (10); } /* If it's not an end-of-archive mark, it must have a valid checksum.*/ if (!checksum(a, h)) return (0); bid += 48; /* Checksum is usually 6 octal digits. */ header = (const struct archive_entry_header_ustar *)h; /* Recognize POSIX formats. */ if ((memcmp(header->magic, "ustar\0", 6) == 0) && (memcmp(header->version, "00", 2) == 0)) bid += 56; /* Recognize GNU tar format. */ if ((memcmp(header->magic, "ustar ", 6) == 0) && (memcmp(header->version, " \0", 2) == 0)) bid += 56; /* Type flag must be null, digit or A-Z, a-z. */ if (header->typeflag[0] != 0 && !( header->typeflag[0] >= '0' && header->typeflag[0] <= '9') && !( header->typeflag[0] >= 'A' && header->typeflag[0] <= 'Z') && !( header->typeflag[0] >= 'a' && header->typeflag[0] <= 'z') ) return (0); bid += 2; /* 6 bits of variation in an 8-bit field leaves 2 bits. */ /* * Check format of mode/uid/gid/mtime/size/rdevmajor/rdevminor fields. */ if (bid > 0 && ( validate_number_field(header->mode, sizeof(header->mode)) == 0 || validate_number_field(header->uid, sizeof(header->uid)) == 0 || validate_number_field(header->gid, sizeof(header->gid)) == 0 || validate_number_field(header->mtime, sizeof(header->mtime)) == 0 || validate_number_field(header->size, sizeof(header->size)) == 0 || validate_number_field(header->rdevmajor, sizeof(header->rdevmajor)) == 0 || validate_number_field(header->rdevminor, sizeof(header->rdevminor)) == 0)) { bid = 0; } return (bid); } static int archive_read_format_tar_options(struct archive_read *a, const char *key, const char *val) { struct tar *tar; int ret = ARCHIVE_FAILED; tar = (struct tar *)(a->format->data); if (strcmp(key, "compat-2x") == 0) { /* Handle UTF-8 filenames as libarchive 2.x */ tar->compat_2x = (val != NULL && val[0] != 0); tar->init_default_conversion = tar->compat_2x; return (ARCHIVE_OK); } else if (strcmp(key, "hdrcharset") == 0) { if (val == NULL || val[0] == 0) archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "tar: hdrcharset option needs a character-set name"); else { tar->opt_sconv = archive_string_conversion_from_charset( &a->archive, val, 0); if (tar->opt_sconv != NULL) ret = ARCHIVE_OK; else ret = ARCHIVE_FATAL; } return (ret); } else if (strcmp(key, "mac-ext") == 0) { tar->process_mac_extensions = (val != NULL && val[0] != 0); return (ARCHIVE_OK); } else if (strcmp(key, "read_concatenated_archives") == 0) { tar->read_concatenated_archives = (val != NULL && val[0] != 0); return (ARCHIVE_OK); } /* Note: The "warn" return is just to inform the options * supervisor that we didn't handle it. It will generate * a suitable error if no one used this option. */ return (ARCHIVE_WARN); } /* utility function- this exists to centralize the logic of tracking * how much unconsumed data we have floating around, and to consume * anything outstanding since we're going to do read_aheads */ static void tar_flush_unconsumed(struct archive_read *a, size_t *unconsumed) { if (*unconsumed) { /* void *data = (void *)__archive_read_ahead(a, *unconsumed, NULL); * this block of code is to poison claimed unconsumed space, ensuring * things break if it is in use still. * currently it WILL break things, so enable it only for debugging this issue if (data) { memset(data, 0xff, *unconsumed); } */ __archive_read_consume(a, *unconsumed); *unconsumed = 0; } } /* * The function invoked by archive_read_next_header(). This * just sets up a few things and then calls the internal * tar_read_header() function below. */ static int archive_read_format_tar_read_header(struct archive_read *a, struct archive_entry *entry) { /* * When converting tar archives to cpio archives, it is * essential that each distinct file have a distinct inode * number. To simplify this, we keep a static count here to * assign fake dev/inode numbers to each tar entry. Note that * pax format archives may overwrite this with something more * useful. * * Ideally, we would track every file read from the archive so * that we could assign the same dev/ino pair to hardlinks, * but the memory required to store a complete lookup table is * probably not worthwhile just to support the relatively * obscure tar->cpio conversion case. */ static int default_inode; static int default_dev; struct tar *tar; const char *p; const wchar_t *wp; int r; size_t l, unconsumed = 0; /* Assign default device/inode values. */ archive_entry_set_dev(entry, 1 + default_dev); /* Don't use zero. */ archive_entry_set_ino(entry, ++default_inode); /* Don't use zero. */ /* Limit generated st_ino number to 16 bits. */ if (default_inode >= 0xffff) { ++default_dev; default_inode = 0; } tar = (struct tar *)(a->format->data); tar->entry_offset = 0; gnu_clear_sparse_list(tar); tar->realsize = -1; /* Mark this as "unset" */ tar->realsize_override = 0; /* Setup default string conversion. */ tar->sconv = tar->opt_sconv; if (tar->sconv == NULL) { if (!tar->init_default_conversion) { tar->sconv_default = archive_string_default_conversion_for_read(&(a->archive)); tar->init_default_conversion = 1; } tar->sconv = tar->sconv_default; } r = tar_read_header(a, tar, entry, &unconsumed); tar_flush_unconsumed(a, &unconsumed); /* * "non-sparse" files are really just sparse files with * a single block. */ if (tar->sparse_list == NULL) { if (gnu_add_sparse_entry(a, tar, 0, tar->entry_bytes_remaining) != ARCHIVE_OK) return (ARCHIVE_FATAL); } else { struct sparse_block *sb; for (sb = tar->sparse_list; sb != NULL; sb = sb->next) { if (!sb->hole) archive_entry_sparse_add_entry(entry, sb->offset, sb->remaining); } } if (r == ARCHIVE_OK && archive_entry_filetype(entry) == AE_IFREG) { /* * "Regular" entry with trailing '/' is really * directory: This is needed for certain old tar * variants and even for some broken newer ones. */ if ((wp = archive_entry_pathname_w(entry)) != NULL) { l = wcslen(wp); if (l > 0 && wp[l - 1] == L'/') { archive_entry_set_filetype(entry, AE_IFDIR); } } else if ((p = archive_entry_pathname(entry)) != NULL) { l = strlen(p); if (l > 0 && p[l - 1] == '/') { archive_entry_set_filetype(entry, AE_IFDIR); } } } return (r); } static int archive_read_format_tar_read_data(struct archive_read *a, const void **buff, size_t *size, int64_t *offset) { ssize_t bytes_read; struct tar *tar; struct sparse_block *p; tar = (struct tar *)(a->format->data); for (;;) { /* Remove exhausted entries from sparse list. */ while (tar->sparse_list != NULL && tar->sparse_list->remaining == 0) { p = tar->sparse_list; tar->sparse_list = p->next; free(p); } if (tar->entry_bytes_unconsumed) { __archive_read_consume(a, tar->entry_bytes_unconsumed); tar->entry_bytes_unconsumed = 0; } /* If we're at end of file, return EOF. */ if (tar->sparse_list == NULL || tar->entry_bytes_remaining == 0) { if (__archive_read_consume(a, tar->entry_padding) < 0) return (ARCHIVE_FATAL); tar->entry_padding = 0; *buff = NULL; *size = 0; *offset = tar->realsize; return (ARCHIVE_EOF); } *buff = __archive_read_ahead(a, 1, &bytes_read); if (bytes_read < 0) return (ARCHIVE_FATAL); if (*buff == NULL) { archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Truncated tar archive"); return (ARCHIVE_FATAL); } if (bytes_read > tar->entry_bytes_remaining) bytes_read = (ssize_t)tar->entry_bytes_remaining; /* Don't read more than is available in the * current sparse block. */ if (tar->sparse_list->remaining < bytes_read) bytes_read = (ssize_t)tar->sparse_list->remaining; *size = bytes_read; *offset = tar->sparse_list->offset; tar->sparse_list->remaining -= bytes_read; tar->sparse_list->offset += bytes_read; tar->entry_bytes_remaining -= bytes_read; tar->entry_bytes_unconsumed = bytes_read; if (!tar->sparse_list->hole) return (ARCHIVE_OK); /* Current is hole data and skip this. */ } } static int archive_read_format_tar_skip(struct archive_read *a) { int64_t bytes_skipped; int64_t request; struct sparse_block *p; struct tar* tar; tar = (struct tar *)(a->format->data); /* Do not consume the hole of a sparse file. */ request = 0; for (p = tar->sparse_list; p != NULL; p = p->next) { if (!p->hole) { if (p->remaining >= INT64_MAX - request) { return ARCHIVE_FATAL; } request += p->remaining; } } if (request > tar->entry_bytes_remaining) request = tar->entry_bytes_remaining; request += tar->entry_padding + tar->entry_bytes_unconsumed; bytes_skipped = __archive_read_consume(a, request); if (bytes_skipped < 0) return (ARCHIVE_FATAL); tar->entry_bytes_remaining = 0; tar->entry_bytes_unconsumed = 0; tar->entry_padding = 0; /* Free the sparse list. */ gnu_clear_sparse_list(tar); return (ARCHIVE_OK); } /* * This function recursively interprets all of the headers associated * with a single entry. */ static int tar_read_header(struct archive_read *a, struct tar *tar, struct archive_entry *entry, size_t *unconsumed) { ssize_t bytes; int err, eof_vol_header; const char *h; const struct archive_entry_header_ustar *header; const struct archive_entry_header_gnutar *gnuheader; eof_vol_header = 0; /* Loop until we find a workable header record. */ for (;;) { tar_flush_unconsumed(a, unconsumed); /* Read 512-byte header record */ h = __archive_read_ahead(a, 512, &bytes); if (bytes < 0) return ((int)bytes); if (bytes == 0) { /* EOF at a block boundary. */ /* Some writers do omit the block of nulls. */ return (ARCHIVE_EOF); } if (bytes < 512) { /* Short block at EOF; this is bad. */ archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, "Truncated tar archive"); return (ARCHIVE_FATAL); } *unconsumed = 512; /* Header is workable if it's not an end-of-archive mark. */ if (h[0] != 0 || !archive_block_is_null(h)) break; /* Ensure format is set for archives with only null blocks. */ if (a->archive.archive_format_name == NULL) { a->archive.archive_format = ARCHIVE_FORMAT_TAR; a->archive.archive_format_name = "tar"; } if (!tar->read_concatenated_archives) { /* Try to consume a second all-null record, as well. */ tar_flush_unconsumed(a, unconsumed); h = __archive_read_ahead(a, 512, NULL); if (h != NULL && h[0] == 0 && archive_block_is_null(h)) __archive_read_consume(a, 512); archive_clear_error(&a->archive); return (ARCHIVE_EOF); } /* * We're reading concatenated archives, ignore this block and * loop to get the next. */ } /* * Note: If the checksum fails and we return ARCHIVE_RETRY, * then the client is likely to just retry. This is a very * crude way to search for the next valid header! * * TODO: Improve this by implementing a real header scan. */ if (!checksum(a, h)) { tar_flush_unconsumed(a, unconsumed); archive_set_error(&a->archive, EINVAL, "Damaged tar archive"); return (ARCHIVE_RETRY); /* Retryable: Invalid header */ } if (++tar->header_recursion_depth > 32) { tar_flush_unconsumed(a, unconsumed); archive_set_error(&a->archive, EINVAL, "Too many special headers"); return (ARCHIVE_WARN); } /* Determine the format variant. */ header = (const struct archive_entry_header_ustar *)h; switch(header->typeflag[0]) { case 'A': /* Solaris tar ACL */ a->archive.archive_format = ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE; a->archive.archive_format_name = "Solaris tar"; err = header_Solaris_ACL(a, tar, entry, h, unconsumed); break; case 'g': /* POSIX-standard 'g' header. */ a->archive.archive_format = ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE; a->archive.archive_format_name = "POSIX pax interchange format"; err = header_pax_global(a, tar, entry, h, unconsumed); if (err == ARCHIVE_EOF) return (err); break; case 'K': /* Long link name (GNU tar, others) */ err = header_longlink(a, tar, entry, h, unconsumed); break; case 'L': /* Long filename (GNU tar, others) */ err = header_longname(a, tar, entry, h, unconsumed); break; case 'V': /* GNU volume header */ err = header_volume(a, tar, entry, h, unconsumed); if (err == ARCHIVE_EOF) eof_vol_header = 1; break; case 'X': /* Used by SUN tar; same as 'x'. */ a->archive.archive_format = ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE; a->archive.archive_format_name = "POSIX pax interchange format (Sun variant)"; err = header_pax_extensions(a, tar, entry, h, unconsumed); break; case 'x': /* POSIX-standard 'x' header. */ a->archive.archive_format = ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE; a->archive.archive_format_name = "POSIX pax interchange format"; err = header_pax_extensions(a, tar, entry, h, unconsumed); break; default: gnuheader = (const struct archive_entry_header_gnutar *)h; if (memcmp(gnuheader->magic, "ustar \0", 8) == 0) { a->archive.archive_format = ARCHIVE_FORMAT_TAR_GNUTAR; a->archive.archive_format_name = "GNU tar format"; err = header_gnutar(a, tar, entry, h, unconsumed); } else if (memcmp(header->magic, "ustar", 5) == 0) { if (a->archive.archive_format != ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE) { a->archive.archive_format = ARCHIVE_FORMAT_TAR_USTAR; a->archive.archive_format_name = "POSIX ustar format"; } err = header_ustar(a, tar, entry, h); } else { a->archive.archive_format = ARCHIVE_FORMAT_TAR; a->archive.archive_format_name = "tar (non-POSIX)"; err = header_old_tar(a, tar, entry, h); } } if (err == ARCHIVE_FATAL) return (err); tar_flush_unconsumed(a, unconsumed); h = NULL; header = NULL; --tar->header_recursion_depth; /* Yuck. Apple's design here ends up storing long pathname * extensions for both the AppleDouble extension entry and the * regular entry. */ if ((err == ARCHIVE_WARN || err == ARCHIVE_OK) && tar->header_recursion_depth == 0 && tar->process_mac_extensions) { int err2 = read_mac_metadata_blob(a, tar, entry, h, unconsumed); if (err2 < err) err = err2; } /* We return warnings or success as-is. Anything else is fatal. */ if (err == ARCHIVE_WARN || err == ARCHIVE_OK) { if (tar->sparse_gnu_pending) { if (tar->sparse_gnu_major == 1 && tar->sparse_gnu_minor == 0) { ssize_t bytes_read; tar->sparse_gnu_pending = 0; /* Read initial sparse map. */ bytes_read = gnu_sparse_10_read(a, tar, unconsumed); if (bytes_read < 0) return ((int)bytes_read); tar->entry_bytes_remaining -= bytes_read; } else { archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Unrecognized GNU sparse file format"); return (ARCHIVE_WARN); } tar->sparse_gnu_pending = 0; } return (err); } if (err == ARCHIVE_EOF) { if (!eof_vol_header) { /* EOF when recursively reading a header is bad. */ archive_set_error(&a->archive, EINVAL, "Damaged tar archive"); } else { /* If we encounter just a GNU volume header treat * this situation as an empty archive */ return (ARCHIVE_EOF); } } return (ARCHIVE_FATAL); } /* * Return true if block checksum is correct. */ static int checksum(struct archive_read *a, const void *h) { const unsigned char *bytes; const struct archive_entry_header_ustar *header; int check, sum; size_t i; (void)a; /* UNUSED */ bytes = (const unsigned char *)h; header = (const struct archive_entry_header_ustar *)h; /* Checksum field must hold an octal number */ for (i = 0; i < sizeof(header->checksum); ++i) { char c = header->checksum[i]; if (c != ' ' && c != '\0' && (c < '0' || c > '7')) return 0; } /* * Test the checksum. Note that POSIX specifies _unsigned_ * bytes for this calculation. */ sum = (int)tar_atol(header->checksum, sizeof(header->checksum)); check = 0; for (i = 0; i < 148; i++) check += (unsigned char)bytes[i]; for (; i < 156; i++) check += 32; for (; i < 512; i++) check += (unsigned char)bytes[i]; if (sum == check) return (1); /* * Repeat test with _signed_ bytes, just in case this archive * was created by an old BSD, Solaris, or HP-UX tar with a * broken checksum calculation. */ check = 0; for (i = 0; i < 148; i++) check += (signed char)bytes[i]; for (; i < 156; i++) check += 32; for (; i < 512; i++) check += (signed char)bytes[i]; if (sum == check) return (1); return (0); } /* * Return true if this block contains only nulls. */ static int archive_block_is_null(const char *p) { unsigned i; for (i = 0; i < 512; i++) if (*p++) return (0); return (1); } /* * Interpret 'A' Solaris ACL header */ static int header_Solaris_ACL(struct archive_read *a, struct tar *tar, struct archive_entry *entry, const void *h, size_t *unconsumed) { const struct archive_entry_header_ustar *header; size_t size; int err, acl_type; int64_t type; char *acl, *p; /* * read_body_to_string adds a NUL terminator, but we need a little * more to make sure that we don't overrun acl_text later. */ header = (const struct archive_entry_header_ustar *)h; size = (size_t)tar_atol(header->size, sizeof(header->size)); err = read_body_to_string(a, tar, &(tar->acl_text), h, unconsumed); if (err != ARCHIVE_OK) return (err); /* Recursively read next header */ err = tar_read_header(a, tar, entry, unconsumed); if ((err != ARCHIVE_OK) && (err != ARCHIVE_WARN)) return (err); /* TODO: Examine the first characters to see if this * is an AIX ACL descriptor. We'll likely never support * them, but it would be polite to recognize and warn when * we do see them. */ /* Leading octal number indicates ACL type and number of entries. */ p = acl = tar->acl_text.s; type = 0; while (*p != '\0' && p < acl + size) { if (*p < '0' || *p > '7') { archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Malformed Solaris ACL attribute (invalid digit)"); return(ARCHIVE_WARN); } type <<= 3; type += *p - '0'; if (type > 077777777) { archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Malformed Solaris ACL attribute (count too large)"); return (ARCHIVE_WARN); } p++; } switch ((int)type & ~0777777) { case 01000000: /* POSIX.1e ACL */ acl_type = ARCHIVE_ENTRY_ACL_TYPE_ACCESS; break; case 03000000: /* NFSv4 ACL */ acl_type = ARCHIVE_ENTRY_ACL_TYPE_NFS4; break; default: archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Malformed Solaris ACL attribute (unsupported type %o)", (int)type); return (ARCHIVE_WARN); } p++; if (p >= acl + size) { archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Malformed Solaris ACL attribute (body overflow)"); return(ARCHIVE_WARN); } /* ACL text is null-terminated; find the end. */ size -= (p - acl); acl = p; while (*p != '\0' && p < acl + size) p++; if (tar->sconv_acl == NULL) { tar->sconv_acl = archive_string_conversion_from_charset( &(a->archive), "UTF-8", 1); if (tar->sconv_acl == NULL) return (ARCHIVE_FATAL); } archive_strncpy(&(tar->localname), acl, p - acl); err = archive_acl_from_text_l(archive_entry_acl(entry), tar->localname.s, acl_type, tar->sconv_acl); if (err != ARCHIVE_OK) { if (errno == ENOMEM) { archive_set_error(&a->archive, ENOMEM, "Can't allocate memory for ACL"); } else archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Malformed Solaris ACL attribute (unparsable)"); } return (err); } /* * Interpret 'K' long linkname header. */ static int header_longlink(struct archive_read *a, struct tar *tar, struct archive_entry *entry, const void *h, size_t *unconsumed) { int err; err = read_body_to_string(a, tar, &(tar->longlink), h, unconsumed); if (err != ARCHIVE_OK) return (err); err = tar_read_header(a, tar, entry, unconsumed); if ((err != ARCHIVE_OK) && (err != ARCHIVE_WARN)) return (err); /* Set symlink if symlink already set, else hardlink. */ archive_entry_copy_link(entry, tar->longlink.s); return (ARCHIVE_OK); } static int set_conversion_failed_error(struct archive_read *a, struct archive_string_conv *sconv, const char *name) { if (errno == ENOMEM) { archive_set_error(&a->archive, ENOMEM, "Can't allocate memory for %s", name); return (ARCHIVE_FATAL); } archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, "%s can't be converted from %s to current locale.", name, archive_string_conversion_charset_name(sconv)); return (ARCHIVE_WARN); } /* * Interpret 'L' long filename header. */ static int header_longname(struct archive_read *a, struct tar *tar, struct archive_entry *entry, const void *h, size_t *unconsumed) { int err; err = read_body_to_string(a, tar, &(tar->longname), h, unconsumed); if (err != ARCHIVE_OK) return (err); /* Read and parse "real" header, then override name. */ err = tar_read_header(a, tar, entry, unconsumed); if ((err != ARCHIVE_OK) && (err != ARCHIVE_WARN)) return (err); if (archive_entry_copy_pathname_l(entry, tar->longname.s, archive_strlen(&(tar->longname)), tar->sconv) != 0) err = set_conversion_failed_error(a, tar->sconv, "Pathname"); return (err); } /* * Interpret 'V' GNU tar volume header. */ static int header_volume(struct archive_read *a, struct tar *tar, struct archive_entry *entry, const void *h, size_t *unconsumed) { (void)h; /* Just skip this and read the next header. */ return (tar_read_header(a, tar, entry, unconsumed)); } /* * Read body of an archive entry into an archive_string object. */ static int read_body_to_string(struct archive_read *a, struct tar *tar, struct archive_string *as, const void *h, size_t *unconsumed) { int64_t size; const struct archive_entry_header_ustar *header; const void *src; (void)tar; /* UNUSED */ header = (const struct archive_entry_header_ustar *)h; size = tar_atol(header->size, sizeof(header->size)); if ((size > 1048576) || (size < 0)) { archive_set_error(&a->archive, EINVAL, "Special header too large"); return (ARCHIVE_FATAL); } /* Fail if we can't make our buffer big enough. */ if (archive_string_ensure(as, (size_t)size+1) == NULL) { archive_set_error(&a->archive, ENOMEM, "No memory"); return (ARCHIVE_FATAL); } tar_flush_unconsumed(a, unconsumed); /* Read the body into the string. */ *unconsumed = (size_t)((size + 511) & ~ 511); src = __archive_read_ahead(a, *unconsumed, NULL); if (src == NULL) { *unconsumed = 0; return (ARCHIVE_FATAL); } memcpy(as->s, src, (size_t)size); as->s[size] = '\0'; as->length = (size_t)size; return (ARCHIVE_OK); } /* * Parse out common header elements. * * This would be the same as header_old_tar, except that the * filename is handled slightly differently for old and POSIX * entries (POSIX entries support a 'prefix'). This factoring * allows header_old_tar and header_ustar * to handle filenames differently, while still putting most of the * common parsing into one place. */ static int header_common(struct archive_read *a, struct tar *tar, struct archive_entry *entry, const void *h) { const struct archive_entry_header_ustar *header; char tartype; int err = ARCHIVE_OK; header = (const struct archive_entry_header_ustar *)h; if (header->linkname[0]) archive_strncpy(&(tar->entry_linkpath), header->linkname, sizeof(header->linkname)); else archive_string_empty(&(tar->entry_linkpath)); /* Parse out the numeric fields (all are octal) */ archive_entry_set_mode(entry, (mode_t)tar_atol(header->mode, sizeof(header->mode))); archive_entry_set_uid(entry, tar_atol(header->uid, sizeof(header->uid))); archive_entry_set_gid(entry, tar_atol(header->gid, sizeof(header->gid))); tar->entry_bytes_remaining = tar_atol(header->size, sizeof(header->size)); if (tar->entry_bytes_remaining < 0) { tar->entry_bytes_remaining = 0; archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Tar entry has negative size"); return (ARCHIVE_FATAL); } if (tar->entry_bytes_remaining == INT64_MAX) { /* Note: tar_atol returns INT64_MAX on overflow */ tar->entry_bytes_remaining = 0; archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Tar entry size overflow"); return (ARCHIVE_FATAL); } tar->realsize = tar->entry_bytes_remaining; archive_entry_set_size(entry, tar->entry_bytes_remaining); archive_entry_set_mtime(entry, tar_atol(header->mtime, sizeof(header->mtime)), 0); /* Handle the tar type flag appropriately. */ tartype = header->typeflag[0]; switch (tartype) { case '1': /* Hard link */ if (archive_entry_copy_hardlink_l(entry, tar->entry_linkpath.s, archive_strlen(&(tar->entry_linkpath)), tar->sconv) != 0) { err = set_conversion_failed_error(a, tar->sconv, "Linkname"); if (err == ARCHIVE_FATAL) return (err); } /* * The following may seem odd, but: Technically, tar * does not store the file type for a "hard link" * entry, only the fact that it is a hard link. So, I * leave the type zero normally. But, pax interchange * format allows hard links to have data, which * implies that the underlying entry is a regular * file. */ if (archive_entry_size(entry) > 0) archive_entry_set_filetype(entry, AE_IFREG); /* * A tricky point: Traditionally, tar readers have * ignored the size field when reading hardlink * entries, and some writers put non-zero sizes even * though the body is empty. POSIX blessed this * convention in the 1988 standard, but broke with * this tradition in 2001 by permitting hardlink * entries to store valid bodies in pax interchange * format, but not in ustar format. Since there is no * hard and fast way to distinguish pax interchange * from earlier archives (the 'x' and 'g' entries are * optional, after all), we need a heuristic. */ if (archive_entry_size(entry) == 0) { /* If the size is already zero, we're done. */ } else if (a->archive.archive_format == ARCHIVE_FORMAT_TAR_PAX_INTERCHANGE) { /* Definitely pax extended; must obey hardlink size. */ } else if (a->archive.archive_format == ARCHIVE_FORMAT_TAR || a->archive.archive_format == ARCHIVE_FORMAT_TAR_GNUTAR) { /* Old-style or GNU tar: we must ignore the size. */ archive_entry_set_size(entry, 0); tar->entry_bytes_remaining = 0; } else if (archive_read_format_tar_bid(a, 50) > 50) { /* * We don't know if it's pax: If the bid * function sees a valid ustar header * immediately following, then let's ignore * the hardlink size. */ archive_entry_set_size(entry, 0); tar->entry_bytes_remaining = 0; } /* * TODO: There are still two cases I'd like to handle: * = a ustar non-pax archive with a hardlink entry at * end-of-archive. (Look for block of nulls following?) * = a pax archive that has not seen any pax headers * and has an entry which is a hardlink entry storing * a body containing an uncompressed tar archive. * The first is worth addressing; I don't see any reliable * way to deal with the second possibility. */ break; case '2': /* Symlink */ archive_entry_set_filetype(entry, AE_IFLNK); archive_entry_set_size(entry, 0); tar->entry_bytes_remaining = 0; if (archive_entry_copy_symlink_l(entry, tar->entry_linkpath.s, archive_strlen(&(tar->entry_linkpath)), tar->sconv) != 0) { err = set_conversion_failed_error(a, tar->sconv, "Linkname"); if (err == ARCHIVE_FATAL) return (err); } break; case '3': /* Character device */ archive_entry_set_filetype(entry, AE_IFCHR); archive_entry_set_size(entry, 0); tar->entry_bytes_remaining = 0; break; case '4': /* Block device */ archive_entry_set_filetype(entry, AE_IFBLK); archive_entry_set_size(entry, 0); tar->entry_bytes_remaining = 0; break; case '5': /* Dir */ archive_entry_set_filetype(entry, AE_IFDIR); archive_entry_set_size(entry, 0); tar->entry_bytes_remaining = 0; break; case '6': /* FIFO device */ archive_entry_set_filetype(entry, AE_IFIFO); archive_entry_set_size(entry, 0); tar->entry_bytes_remaining = 0; break; case 'D': /* GNU incremental directory type */ /* * No special handling is actually required here. * It might be nice someday to preprocess the file list and * provide it to the client, though. */ archive_entry_set_filetype(entry, AE_IFDIR); break; case 'M': /* GNU "Multi-volume" (remainder of file from last archive)*/ /* * As far as I can tell, this is just like a regular file * entry, except that the contents should be _appended_ to * the indicated file at the indicated offset. This may * require some API work to fully support. */ break; case 'N': /* Old GNU "long filename" entry. */ /* The body of this entry is a script for renaming * previously-extracted entries. Ugh. It will never * be supported by libarchive. */ archive_entry_set_filetype(entry, AE_IFREG); break; case 'S': /* GNU sparse files */ /* * Sparse files are really just regular files with * sparse information in the extended area. */ /* FALLTHROUGH */ case '0': /* * Enable sparse file "read" support only for regular * files and explicit GNU sparse files. However, we * don't allow non-standard file types to be sparse. */ tar->sparse_allowed = 1; /* FALLTHROUGH */ default: /* Regular file and non-standard types */ /* * Per POSIX: non-recognized types should always be * treated as regular files. */ archive_entry_set_filetype(entry, AE_IFREG); break; } return (err); } /* * Parse out header elements for "old-style" tar archives. */ static int header_old_tar(struct archive_read *a, struct tar *tar, struct archive_entry *entry, const void *h) { const struct archive_entry_header_ustar *header; int err = ARCHIVE_OK, err2; /* Copy filename over (to ensure null termination). */ header = (const struct archive_entry_header_ustar *)h; if (archive_entry_copy_pathname_l(entry, header->name, sizeof(header->name), tar->sconv) != 0) { err = set_conversion_failed_error(a, tar->sconv, "Pathname"); if (err == ARCHIVE_FATAL) return (err); } /* Grab rest of common fields */ err2 = header_common(a, tar, entry, h); if (err > err2) err = err2; tar->entry_padding = 0x1ff & (-tar->entry_bytes_remaining); return (err); } /* * Read a Mac AppleDouble-encoded blob of file metadata, * if there is one. */ static int read_mac_metadata_blob(struct archive_read *a, struct tar *tar, struct archive_entry *entry, const void *h, size_t *unconsumed) { int64_t size; const void *data; const char *p, *name; const wchar_t *wp, *wname; (void)h; /* UNUSED */ wname = wp = archive_entry_pathname_w(entry); if (wp != NULL) { /* Find the last path element. */ for (; *wp != L'\0'; ++wp) { if (wp[0] == '/' && wp[1] != L'\0') wname = wp + 1; } /* * If last path element starts with "._", then * this is a Mac extension. */ if (wname[0] != L'.' || wname[1] != L'_' || wname[2] == L'\0') return ARCHIVE_OK; } else { /* Find the last path element. */ name = p = archive_entry_pathname(entry); if (p == NULL) return (ARCHIVE_FAILED); for (; *p != '\0'; ++p) { if (p[0] == '/' && p[1] != '\0') name = p + 1; } /* * If last path element starts with "._", then * this is a Mac extension. */ if (name[0] != '.' || name[1] != '_' || name[2] == '\0') return ARCHIVE_OK; } /* Read the body as a Mac OS metadata blob. */ size = archive_entry_size(entry); /* * TODO: Look beyond the body here to peek at the next header. * If it's a regular header (not an extension header) * that has the wrong name, just return the current * entry as-is, without consuming the body here. * That would reduce the risk of us mis-identifying * an ordinary file that just happened to have * a name starting with "._". * * Q: Is the above idea really possible? Even * when there are GNU or pax extension entries? */ data = __archive_read_ahead(a, (size_t)size, NULL); if (data == NULL) { *unconsumed = 0; return (ARCHIVE_FATAL); } archive_entry_copy_mac_metadata(entry, data, (size_t)size); *unconsumed = (size_t)((size + 511) & ~ 511); tar_flush_unconsumed(a, unconsumed); return (tar_read_header(a, tar, entry, unconsumed)); } /* * Parse a file header for a pax extended archive entry. */ static int header_pax_global(struct archive_read *a, struct tar *tar, struct archive_entry *entry, const void *h, size_t *unconsumed) { int err; err = read_body_to_string(a, tar, &(tar->pax_global), h, unconsumed); if (err != ARCHIVE_OK) return (err); err = tar_read_header(a, tar, entry, unconsumed); return (err); } static int header_pax_extensions(struct archive_read *a, struct tar *tar, struct archive_entry *entry, const void *h, size_t *unconsumed) { int err, err2; err = read_body_to_string(a, tar, &(tar->pax_header), h, unconsumed); if (err != ARCHIVE_OK) return (err); /* Parse the next header. */ err = tar_read_header(a, tar, entry, unconsumed); if ((err != ARCHIVE_OK) && (err != ARCHIVE_WARN)) return (err); /* * TODO: Parse global/default options into 'entry' struct here * before handling file-specific options. * * This design (parse standard header, then overwrite with pax * extended attribute data) usually works well, but isn't ideal; * it would be better to parse the pax extended attributes first * and then skip any fields in the standard header that were * defined in the pax header. */ err2 = pax_header(a, tar, entry, &tar->pax_header); err = err_combine(err, err2); tar->entry_padding = 0x1ff & (-tar->entry_bytes_remaining); return (err); } /* * Parse a file header for a Posix "ustar" archive entry. This also * handles "pax" or "extended ustar" entries. */ static int header_ustar(struct archive_read *a, struct tar *tar, struct archive_entry *entry, const void *h) { const struct archive_entry_header_ustar *header; struct archive_string *as; int err = ARCHIVE_OK, r; header = (const struct archive_entry_header_ustar *)h; /* Copy name into an internal buffer to ensure null-termination. */ as = &(tar->entry_pathname); if (header->prefix[0]) { archive_strncpy(as, header->prefix, sizeof(header->prefix)); if (as->s[archive_strlen(as) - 1] != '/') archive_strappend_char(as, '/'); archive_strncat(as, header->name, sizeof(header->name)); } else { archive_strncpy(as, header->name, sizeof(header->name)); } if (archive_entry_copy_pathname_l(entry, as->s, archive_strlen(as), tar->sconv) != 0) { err = set_conversion_failed_error(a, tar->sconv, "Pathname"); if (err == ARCHIVE_FATAL) return (err); } /* Handle rest of common fields. */ r = header_common(a, tar, entry, h); if (r == ARCHIVE_FATAL) return (r); if (r < err) err = r; /* Handle POSIX ustar fields. */ if (archive_entry_copy_uname_l(entry, header->uname, sizeof(header->uname), tar->sconv) != 0) { err = set_conversion_failed_error(a, tar->sconv, "Uname"); if (err == ARCHIVE_FATAL) return (err); } if (archive_entry_copy_gname_l(entry, header->gname, sizeof(header->gname), tar->sconv) != 0) { err = set_conversion_failed_error(a, tar->sconv, "Gname"); if (err == ARCHIVE_FATAL) return (err); } /* Parse out device numbers only for char and block specials. */ if (header->typeflag[0] == '3' || header->typeflag[0] == '4') { archive_entry_set_rdevmajor(entry, (dev_t) tar_atol(header->rdevmajor, sizeof(header->rdevmajor))); archive_entry_set_rdevminor(entry, (dev_t) tar_atol(header->rdevminor, sizeof(header->rdevminor))); } tar->entry_padding = 0x1ff & (-tar->entry_bytes_remaining); return (err); } /* * Parse the pax extended attributes record. * * Returns non-zero if there's an error in the data. */ static int pax_header(struct archive_read *a, struct tar *tar, struct archive_entry *entry, struct archive_string *in_as) { size_t attr_length, l, line_length, value_length; char *p; char *key, *value; struct archive_string *as; struct archive_string_conv *sconv; int err, err2; char *attr = in_as->s; attr_length = in_as->length; tar->pax_hdrcharset_binary = 0; archive_string_empty(&(tar->entry_gname)); archive_string_empty(&(tar->entry_linkpath)); archive_string_empty(&(tar->entry_pathname)); archive_string_empty(&(tar->entry_pathname_override)); archive_string_empty(&(tar->entry_uname)); err = ARCHIVE_OK; while (attr_length > 0) { /* Parse decimal length field at start of line. */ line_length = 0; l = attr_length; p = attr; /* Record start of line. */ while (l>0) { if (*p == ' ') { p++; l--; break; } if (*p < '0' || *p > '9') { archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Ignoring malformed pax extended attributes"); return (ARCHIVE_WARN); } line_length *= 10; line_length += *p - '0'; if (line_length > 999999) { archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Rejecting pax extended attribute > 1MB"); return (ARCHIVE_WARN); } p++; l--; } /* * Parsed length must be no bigger than available data, * at least 1, and the last character of the line must * be '\n'. */ if (line_length > attr_length || line_length < 1 || attr[line_length - 1] != '\n') { archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Ignoring malformed pax extended attribute"); return (ARCHIVE_WARN); } /* Null-terminate the line. */ attr[line_length - 1] = '\0'; /* Find end of key and null terminate it. */ key = p; if (key[0] == '=') return (-1); while (*p && *p != '=') ++p; if (*p == '\0') { archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Invalid pax extended attributes"); return (ARCHIVE_WARN); } *p = '\0'; value = p + 1; /* Some values may be binary data */ value_length = attr + line_length - 1 - value; /* Identify this attribute and set it in the entry. */ err2 = pax_attribute(a, tar, entry, key, value, value_length); if (err2 == ARCHIVE_FATAL) return (err2); err = err_combine(err, err2); /* Skip to next line */ attr += line_length; attr_length -= line_length; } /* * PAX format uses UTF-8 as default charset for its metadata * unless hdrcharset=BINARY is present in its header. * We apply the charset specified by the hdrcharset option only * when the hdrcharset attribute(in PAX header) is BINARY because * we respect the charset described in PAX header and BINARY also * means that metadata(filename,uname and gname) character-set * is unknown. */ if (tar->pax_hdrcharset_binary) sconv = tar->opt_sconv; else { sconv = archive_string_conversion_from_charset( &(a->archive), "UTF-8", 1); if (sconv == NULL) return (ARCHIVE_FATAL); if (tar->compat_2x) archive_string_conversion_set_opt(sconv, SCONV_SET_OPT_UTF8_LIBARCHIVE2X); } if (archive_strlen(&(tar->entry_gname)) > 0) { if (archive_entry_copy_gname_l(entry, tar->entry_gname.s, archive_strlen(&(tar->entry_gname)), sconv) != 0) { err = set_conversion_failed_error(a, sconv, "Gname"); if (err == ARCHIVE_FATAL) return (err); /* Use a converted an original name. */ archive_entry_copy_gname(entry, tar->entry_gname.s); } } if (archive_strlen(&(tar->entry_linkpath)) > 0) { if (archive_entry_copy_link_l(entry, tar->entry_linkpath.s, archive_strlen(&(tar->entry_linkpath)), sconv) != 0) { err = set_conversion_failed_error(a, sconv, "Linkname"); if (err == ARCHIVE_FATAL) return (err); /* Use a converted an original name. */ archive_entry_copy_link(entry, tar->entry_linkpath.s); } } /* * Some extensions (such as the GNU sparse file extensions) * deliberately store a synthetic name under the regular 'path' * attribute and the real file name under a different attribute. * Since we're supposed to not care about the order, we * have no choice but to store all of the various filenames * we find and figure it all out afterwards. This is the * figuring out part. */ as = NULL; if (archive_strlen(&(tar->entry_pathname_override)) > 0) as = &(tar->entry_pathname_override); else if (archive_strlen(&(tar->entry_pathname)) > 0) as = &(tar->entry_pathname); if (as != NULL) { if (archive_entry_copy_pathname_l(entry, as->s, archive_strlen(as), sconv) != 0) { err = set_conversion_failed_error(a, sconv, "Pathname"); if (err == ARCHIVE_FATAL) return (err); /* Use a converted an original name. */ archive_entry_copy_pathname(entry, as->s); } } if (archive_strlen(&(tar->entry_uname)) > 0) { if (archive_entry_copy_uname_l(entry, tar->entry_uname.s, archive_strlen(&(tar->entry_uname)), sconv) != 0) { err = set_conversion_failed_error(a, sconv, "Uname"); if (err == ARCHIVE_FATAL) return (err); /* Use a converted an original name. */ archive_entry_copy_uname(entry, tar->entry_uname.s); } } return (err); } static int pax_attribute_xattr(struct archive_entry *entry, const char *name, const char *value) { char *name_decoded; void *value_decoded; size_t value_len; if (strlen(name) < 18 || (memcmp(name, "LIBARCHIVE.xattr.", 17)) != 0) return 3; name += 17; /* URL-decode name */ name_decoded = url_decode(name); if (name_decoded == NULL) return 2; /* Base-64 decode value */ value_decoded = base64_decode(value, strlen(value), &value_len); if (value_decoded == NULL) { free(name_decoded); return 1; } archive_entry_xattr_add_entry(entry, name_decoded, value_decoded, value_len); free(name_decoded); free(value_decoded); return 0; } static int pax_attribute_schily_xattr(struct archive_entry *entry, const char *name, const char *value, size_t value_length) { if (strlen(name) < 14 || (memcmp(name, "SCHILY.xattr.", 13)) != 0) return 1; name += 13; archive_entry_xattr_add_entry(entry, name, value, value_length); return 0; } static int pax_attribute_rht_security_selinux(struct archive_entry *entry, const char *value, size_t value_length) { archive_entry_xattr_add_entry(entry, "security.selinux", value, value_length); return 0; } static int pax_attribute_acl(struct archive_read *a, struct tar *tar, struct archive_entry *entry, const char *value, int type) { int r; const char* errstr; switch (type) { case ARCHIVE_ENTRY_ACL_TYPE_ACCESS: errstr = "SCHILY.acl.access"; break; case ARCHIVE_ENTRY_ACL_TYPE_DEFAULT: errstr = "SCHILY.acl.default"; break; case ARCHIVE_ENTRY_ACL_TYPE_NFS4: errstr = "SCHILY.acl.ace"; break; default: archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Unknown ACL type: %d", type); return(ARCHIVE_FATAL); } if (tar->sconv_acl == NULL) { tar->sconv_acl = archive_string_conversion_from_charset( &(a->archive), "UTF-8", 1); if (tar->sconv_acl == NULL) return (ARCHIVE_FATAL); } r = archive_acl_from_text_l(archive_entry_acl(entry), value, type, tar->sconv_acl); if (r != ARCHIVE_OK) { if (r == ARCHIVE_FATAL) { archive_set_error(&a->archive, ENOMEM, "%s %s", "Can't allocate memory for ", errstr); return (r); } archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "%s %s", "Parse error: ", errstr); } return (r); } /* * Parse a single key=value attribute. key/value pointers are * assumed to point into reasonably long-lived storage. * * Note that POSIX reserves all-lowercase keywords. Vendor-specific * extensions should always have keywords of the form "VENDOR.attribute" * In particular, it's quite feasible to support many different * vendor extensions here. I'm using "LIBARCHIVE" for extensions * unique to this library. * * Investigate other vendor-specific extensions and see if * any of them look useful. */ static int pax_attribute(struct archive_read *a, struct tar *tar, struct archive_entry *entry, const char *key, const char *value, size_t value_length) { int64_t s; long n; int err = ARCHIVE_OK, r; #ifndef __FreeBSD__ if (value == NULL) value = ""; /* Disable compiler warning; do not pass * NULL pointer to strlen(). */ #endif switch (key[0]) { case 'G': /* Reject GNU.sparse.* headers on non-regular files. */ if (strncmp(key, "GNU.sparse", 10) == 0 && !tar->sparse_allowed) { archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Non-regular file cannot be sparse"); return (ARCHIVE_FATAL); } /* GNU "0.0" sparse pax format. */ if (strcmp(key, "GNU.sparse.numblocks") == 0) { tar->sparse_offset = -1; tar->sparse_numbytes = -1; tar->sparse_gnu_major = 0; tar->sparse_gnu_minor = 0; } if (strcmp(key, "GNU.sparse.offset") == 0) { tar->sparse_offset = tar_atol10(value, strlen(value)); if (tar->sparse_numbytes != -1) { if (gnu_add_sparse_entry(a, tar, tar->sparse_offset, tar->sparse_numbytes) != ARCHIVE_OK) return (ARCHIVE_FATAL); tar->sparse_offset = -1; tar->sparse_numbytes = -1; } } if (strcmp(key, "GNU.sparse.numbytes") == 0) { tar->sparse_numbytes = tar_atol10(value, strlen(value)); if (tar->sparse_numbytes != -1) { if (gnu_add_sparse_entry(a, tar, tar->sparse_offset, tar->sparse_numbytes) != ARCHIVE_OK) return (ARCHIVE_FATAL); tar->sparse_offset = -1; tar->sparse_numbytes = -1; } } if (strcmp(key, "GNU.sparse.size") == 0) { tar->realsize = tar_atol10(value, strlen(value)); archive_entry_set_size(entry, tar->realsize); tar->realsize_override = 1; } /* GNU "0.1" sparse pax format. */ if (strcmp(key, "GNU.sparse.map") == 0) { tar->sparse_gnu_major = 0; tar->sparse_gnu_minor = 1; if (gnu_sparse_01_parse(a, tar, value) != ARCHIVE_OK) return (ARCHIVE_WARN); } /* GNU "1.0" sparse pax format */ if (strcmp(key, "GNU.sparse.major") == 0) { tar->sparse_gnu_major = (int)tar_atol10(value, strlen(value)); tar->sparse_gnu_pending = 1; } if (strcmp(key, "GNU.sparse.minor") == 0) { tar->sparse_gnu_minor = (int)tar_atol10(value, strlen(value)); tar->sparse_gnu_pending = 1; } if (strcmp(key, "GNU.sparse.name") == 0) { /* * The real filename; when storing sparse * files, GNU tar puts a synthesized name into * the regular 'path' attribute in an attempt * to limit confusion. ;-) */ archive_strcpy(&(tar->entry_pathname_override), value); } if (strcmp(key, "GNU.sparse.realsize") == 0) { tar->realsize = tar_atol10(value, strlen(value)); archive_entry_set_size(entry, tar->realsize); tar->realsize_override = 1; } break; case 'L': /* Our extensions */ /* TODO: Handle arbitrary extended attributes... */ /* if (strcmp(key, "LIBARCHIVE.xxxxxxx") == 0) archive_entry_set_xxxxxx(entry, value); */ if (strcmp(key, "LIBARCHIVE.creationtime") == 0) { pax_time(value, &s, &n); archive_entry_set_birthtime(entry, s, n); } if (strcmp(key, "LIBARCHIVE.symlinktype") == 0) { if (strcmp(value, "file") == 0) { archive_entry_set_symlink_type(entry, AE_SYMLINK_TYPE_FILE); } else if (strcmp(value, "dir") == 0) { archive_entry_set_symlink_type(entry, AE_SYMLINK_TYPE_DIRECTORY); } } if (memcmp(key, "LIBARCHIVE.xattr.", 17) == 0) pax_attribute_xattr(entry, key, value); break; case 'R': /* GNU tar uses RHT.security header to store SELinux xattrs * SCHILY.xattr.security.selinux == RHT.security.selinux */ if (strcmp(key, "RHT.security.selinux") == 0) { pax_attribute_rht_security_selinux(entry, value, value_length); } break; case 'S': /* We support some keys used by the "star" archiver */ if (strcmp(key, "SCHILY.acl.access") == 0) { r = pax_attribute_acl(a, tar, entry, value, ARCHIVE_ENTRY_ACL_TYPE_ACCESS); if (r == ARCHIVE_FATAL) return (r); } else if (strcmp(key, "SCHILY.acl.default") == 0) { r = pax_attribute_acl(a, tar, entry, value, ARCHIVE_ENTRY_ACL_TYPE_DEFAULT); if (r == ARCHIVE_FATAL) return (r); } else if (strcmp(key, "SCHILY.acl.ace") == 0) { r = pax_attribute_acl(a, tar, entry, value, ARCHIVE_ENTRY_ACL_TYPE_NFS4); if (r == ARCHIVE_FATAL) return (r); } else if (strcmp(key, "SCHILY.devmajor") == 0) { archive_entry_set_rdevmajor(entry, (dev_t)tar_atol10(value, strlen(value))); } else if (strcmp(key, "SCHILY.devminor") == 0) { archive_entry_set_rdevminor(entry, (dev_t)tar_atol10(value, strlen(value))); } else if (strcmp(key, "SCHILY.fflags") == 0) { archive_entry_copy_fflags_text(entry, value); } else if (strcmp(key, "SCHILY.dev") == 0) { archive_entry_set_dev(entry, (dev_t)tar_atol10(value, strlen(value))); } else if (strcmp(key, "SCHILY.ino") == 0) { archive_entry_set_ino(entry, tar_atol10(value, strlen(value))); } else if (strcmp(key, "SCHILY.nlink") == 0) { archive_entry_set_nlink(entry, (unsigned) tar_atol10(value, strlen(value))); } else if (strcmp(key, "SCHILY.realsize") == 0) { tar->realsize = tar_atol10(value, strlen(value)); tar->realsize_override = 1; archive_entry_set_size(entry, tar->realsize); } else if (strncmp(key, "SCHILY.xattr.", 13) == 0) { pax_attribute_schily_xattr(entry, key, value, value_length); } else if (strcmp(key, "SUN.holesdata") == 0) { /* A Solaris extension for sparse. */ r = solaris_sparse_parse(a, tar, entry, value); if (r < err) { if (r == ARCHIVE_FATAL) return (r); err = r; archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Parse error: SUN.holesdata"); } } break; case 'a': if (strcmp(key, "atime") == 0) { pax_time(value, &s, &n); archive_entry_set_atime(entry, s, n); } break; case 'c': if (strcmp(key, "ctime") == 0) { pax_time(value, &s, &n); archive_entry_set_ctime(entry, s, n); } else if (strcmp(key, "charset") == 0) { /* TODO: Publish charset information in entry. */ } else if (strcmp(key, "comment") == 0) { /* TODO: Publish comment in entry. */ } break; case 'g': if (strcmp(key, "gid") == 0) { archive_entry_set_gid(entry, tar_atol10(value, strlen(value))); } else if (strcmp(key, "gname") == 0) { archive_strcpy(&(tar->entry_gname), value); } break; case 'h': if (strcmp(key, "hdrcharset") == 0) { if (strcmp(value, "BINARY") == 0) /* Binary mode. */ tar->pax_hdrcharset_binary = 1; else if (strcmp(value, "ISO-IR 10646 2000 UTF-8") == 0) tar->pax_hdrcharset_binary = 0; } break; case 'l': /* pax interchange doesn't distinguish hardlink vs. symlink. */ if (strcmp(key, "linkpath") == 0) { archive_strcpy(&(tar->entry_linkpath), value); } break; case 'm': if (strcmp(key, "mtime") == 0) { pax_time(value, &s, &n); archive_entry_set_mtime(entry, s, n); } break; case 'p': if (strcmp(key, "path") == 0) { archive_strcpy(&(tar->entry_pathname), value); } break; case 'r': /* POSIX has reserved 'realtime.*' */ break; case 's': /* POSIX has reserved 'security.*' */ /* Someday: if (strcmp(key, "security.acl") == 0) { ... } */ if (strcmp(key, "size") == 0) { /* "size" is the size of the data in the entry. */ tar->entry_bytes_remaining = tar_atol10(value, strlen(value)); /* * The "size" pax header keyword always overrides the * "size" field in the tar header. * GNU.sparse.realsize, GNU.sparse.size and * SCHILY.realsize override this value. */ if (!tar->realsize_override) { archive_entry_set_size(entry, tar->entry_bytes_remaining); tar->realsize = tar->entry_bytes_remaining; } } break; case 'u': if (strcmp(key, "uid") == 0) { archive_entry_set_uid(entry, tar_atol10(value, strlen(value))); } else if (strcmp(key, "uname") == 0) { archive_strcpy(&(tar->entry_uname), value); } break; } return (err); } /* * parse a decimal time value, which may include a fractional portion */ static void pax_time(const char *p, int64_t *ps, long *pn) { char digit; int64_t s; unsigned long l; int sign; int64_t limit, last_digit_limit; limit = INT64_MAX / 10; last_digit_limit = INT64_MAX % 10; s = 0; sign = 1; if (*p == '-') { sign = -1; p++; } while (*p >= '0' && *p <= '9') { digit = *p - '0'; if (s > limit || (s == limit && digit > last_digit_limit)) { s = INT64_MAX; break; } s = (s * 10) + digit; ++p; } *ps = s * sign; /* Calculate nanoseconds. */ *pn = 0; if (*p != '.') return; l = 100000000UL; do { ++p; if (*p >= '0' && *p <= '9') *pn += (*p - '0') * l; else break; } while (l /= 10); } /* * Parse GNU tar header */ static int header_gnutar(struct archive_read *a, struct tar *tar, struct archive_entry *entry, const void *h, size_t *unconsumed) { const struct archive_entry_header_gnutar *header; int64_t t; int err = ARCHIVE_OK; /* * GNU header is like POSIX ustar, except 'prefix' is * replaced with some other fields. This also means the * filename is stored as in old-style archives. */ /* Grab fields common to all tar variants. */ err = header_common(a, tar, entry, h); if (err == ARCHIVE_FATAL) return (err); /* Copy filename over (to ensure null termination). */ header = (const struct archive_entry_header_gnutar *)h; if (archive_entry_copy_pathname_l(entry, header->name, sizeof(header->name), tar->sconv) != 0) { err = set_conversion_failed_error(a, tar->sconv, "Pathname"); if (err == ARCHIVE_FATAL) return (err); } /* Fields common to ustar and GNU */ /* XXX Can the following be factored out since it's common * to ustar and gnu tar? Is it okay to move it down into * header_common, perhaps? */ if (archive_entry_copy_uname_l(entry, header->uname, sizeof(header->uname), tar->sconv) != 0) { err = set_conversion_failed_error(a, tar->sconv, "Uname"); if (err == ARCHIVE_FATAL) return (err); } if (archive_entry_copy_gname_l(entry, header->gname, sizeof(header->gname), tar->sconv) != 0) { err = set_conversion_failed_error(a, tar->sconv, "Gname"); if (err == ARCHIVE_FATAL) return (err); } /* Parse out device numbers only for char and block specials */ if (header->typeflag[0] == '3' || header->typeflag[0] == '4') { archive_entry_set_rdevmajor(entry, (dev_t) tar_atol(header->rdevmajor, sizeof(header->rdevmajor))); archive_entry_set_rdevminor(entry, (dev_t) tar_atol(header->rdevminor, sizeof(header->rdevminor))); } else archive_entry_set_rdev(entry, 0); tar->entry_padding = 0x1ff & (-tar->entry_bytes_remaining); /* Grab GNU-specific fields. */ t = tar_atol(header->atime, sizeof(header->atime)); if (t > 0) archive_entry_set_atime(entry, t, 0); t = tar_atol(header->ctime, sizeof(header->ctime)); if (t > 0) archive_entry_set_ctime(entry, t, 0); if (header->realsize[0] != 0) { tar->realsize = tar_atol(header->realsize, sizeof(header->realsize)); archive_entry_set_size(entry, tar->realsize); tar->realsize_override = 1; } if (header->sparse[0].offset[0] != 0) { if (gnu_sparse_old_read(a, tar, header, unconsumed) != ARCHIVE_OK) return (ARCHIVE_FATAL); } else { if (header->isextended[0] != 0) { /* XXX WTF? XXX */ } } return (err); } static int gnu_add_sparse_entry(struct archive_read *a, struct tar *tar, int64_t offset, int64_t remaining) { struct sparse_block *p; p = (struct sparse_block *)calloc(1, sizeof(*p)); if (p == NULL) { archive_set_error(&a->archive, ENOMEM, "Out of memory"); return (ARCHIVE_FATAL); } if (tar->sparse_last != NULL) tar->sparse_last->next = p; else tar->sparse_list = p; tar->sparse_last = p; if (remaining < 0 || offset < 0 || offset > INT64_MAX - remaining) { archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Malformed sparse map data"); return (ARCHIVE_FATAL); } p->offset = offset; p->remaining = remaining; return (ARCHIVE_OK); } static void gnu_clear_sparse_list(struct tar *tar) { struct sparse_block *p; while (tar->sparse_list != NULL) { p = tar->sparse_list; tar->sparse_list = p->next; free(p); } tar->sparse_last = NULL; } /* * GNU tar old-format sparse data. * * GNU old-format sparse data is stored in a fixed-field * format. Offset/size values are 11-byte octal fields (same * format as 'size' field in ustart header). These are * stored in the header, allocating subsequent header blocks * as needed. Extending the header in this way is a pretty * severe POSIX violation; this design has earned GNU tar a * lot of criticism. */ static int gnu_sparse_old_read(struct archive_read *a, struct tar *tar, const struct archive_entry_header_gnutar *header, size_t *unconsumed) { ssize_t bytes_read; const void *data; struct extended { struct gnu_sparse sparse[21]; char isextended[1]; char padding[7]; }; const struct extended *ext; if (gnu_sparse_old_parse(a, tar, header->sparse, 4) != ARCHIVE_OK) return (ARCHIVE_FATAL); if (header->isextended[0] == 0) return (ARCHIVE_OK); do { tar_flush_unconsumed(a, unconsumed); data = __archive_read_ahead(a, 512, &bytes_read); if (bytes_read < 0) return (ARCHIVE_FATAL); if (bytes_read < 512) { archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, "Truncated tar archive " "detected while reading sparse file data"); return (ARCHIVE_FATAL); } *unconsumed = 512; ext = (const struct extended *)data; if (gnu_sparse_old_parse(a, tar, ext->sparse, 21) != ARCHIVE_OK) return (ARCHIVE_FATAL); } while (ext->isextended[0] != 0); if (tar->sparse_list != NULL) tar->entry_offset = tar->sparse_list->offset; return (ARCHIVE_OK); } static int gnu_sparse_old_parse(struct archive_read *a, struct tar *tar, const struct gnu_sparse *sparse, int length) { while (length > 0 && sparse->offset[0] != 0) { if (gnu_add_sparse_entry(a, tar, tar_atol(sparse->offset, sizeof(sparse->offset)), tar_atol(sparse->numbytes, sizeof(sparse->numbytes))) != ARCHIVE_OK) return (ARCHIVE_FATAL); sparse++; length--; } return (ARCHIVE_OK); } /* * GNU tar sparse format 0.0 * * Beginning with GNU tar 1.15, sparse files are stored using * information in the pax extended header. The GNU tar maintainers * have gone through a number of variations in the process of working * out this scheme; fortunately, they're all numbered. * * Sparse format 0.0 uses attribute GNU.sparse.numblocks to store the * number of blocks, and GNU.sparse.offset/GNU.sparse.numbytes to * store offset/size for each block. The repeated instances of these * latter fields violate the pax specification (which frowns on * duplicate keys), so this format was quickly replaced. */ /* * GNU tar sparse format 0.1 * * This version replaced the offset/numbytes attributes with * a single "map" attribute that stored a list of integers. This * format had two problems: First, the "map" attribute could be very * long, which caused problems for some implementations. More * importantly, the sparse data was lost when extracted by archivers * that didn't recognize this extension. */ static int gnu_sparse_01_parse(struct archive_read *a, struct tar *tar, const char *p) { const char *e; int64_t offset = -1, size = -1; for (;;) { e = p; while (*e != '\0' && *e != ',') { if (*e < '0' || *e > '9') return (ARCHIVE_WARN); e++; } if (offset < 0) { offset = tar_atol10(p, e - p); if (offset < 0) return (ARCHIVE_WARN); } else { size = tar_atol10(p, e - p); if (size < 0) return (ARCHIVE_WARN); if (gnu_add_sparse_entry(a, tar, offset, size) != ARCHIVE_OK) return (ARCHIVE_FATAL); offset = -1; } if (*e == '\0') return (ARCHIVE_OK); p = e + 1; } } /* * GNU tar sparse format 1.0 * * The idea: The offset/size data is stored as a series of base-10 * ASCII numbers prepended to the file data, so that dearchivers that * don't support this format will extract the block map along with the * data and a separate post-process can restore the sparseness. * * Unfortunately, GNU tar 1.16 had a bug that added unnecessary * padding to the body of the file when using this format. GNU tar * 1.17 corrected this bug without bumping the version number, so * it's not possible to support both variants. This code supports * the later variant at the expense of not supporting the former. * * This variant also replaced GNU.sparse.size with GNU.sparse.realsize * and introduced the GNU.sparse.major/GNU.sparse.minor attributes. */ /* * Read the next line from the input, and parse it as a decimal * integer followed by '\n'. Returns positive integer value or * negative on error. */ static int64_t gnu_sparse_10_atol(struct archive_read *a, struct tar *tar, int64_t *remaining, size_t *unconsumed) { int64_t l, limit, last_digit_limit; const char *p; ssize_t bytes_read; int base, digit; base = 10; limit = INT64_MAX / base; last_digit_limit = INT64_MAX % base; /* * Skip any lines starting with '#'; GNU tar specs * don't require this, but they should. */ do { bytes_read = readline(a, tar, &p, (ssize_t)tar_min(*remaining, 100), unconsumed); if (bytes_read <= 0) return (ARCHIVE_FATAL); *remaining -= bytes_read; } while (p[0] == '#'); l = 0; while (bytes_read > 0) { if (*p == '\n') return (l); if (*p < '0' || *p >= '0' + base) return (ARCHIVE_WARN); digit = *p - '0'; if (l > limit || (l == limit && digit > last_digit_limit)) l = INT64_MAX; /* Truncate on overflow. */ else l = (l * base) + digit; p++; bytes_read--; } /* TODO: Error message. */ return (ARCHIVE_WARN); } /* * Returns length (in bytes) of the sparse data description * that was read. */ static ssize_t gnu_sparse_10_read(struct archive_read *a, struct tar *tar, size_t *unconsumed) { ssize_t bytes_read; int entries; int64_t offset, size, to_skip, remaining; /* Clear out the existing sparse list. */ gnu_clear_sparse_list(tar); remaining = tar->entry_bytes_remaining; /* Parse entries. */ entries = (int)gnu_sparse_10_atol(a, tar, &remaining, unconsumed); if (entries < 0) return (ARCHIVE_FATAL); /* Parse the individual entries. */ while (entries-- > 0) { /* Parse offset/size */ offset = gnu_sparse_10_atol(a, tar, &remaining, unconsumed); if (offset < 0) return (ARCHIVE_FATAL); size = gnu_sparse_10_atol(a, tar, &remaining, unconsumed); if (size < 0) return (ARCHIVE_FATAL); /* Add a new sparse entry. */ if (gnu_add_sparse_entry(a, tar, offset, size) != ARCHIVE_OK) return (ARCHIVE_FATAL); } /* Skip rest of block... */ tar_flush_unconsumed(a, unconsumed); bytes_read = (ssize_t)(tar->entry_bytes_remaining - remaining); to_skip = 0x1ff & -bytes_read; /* Fail if tar->entry_bytes_remaing would get negative */ if (to_skip > remaining) return (ARCHIVE_FATAL); if (to_skip != __archive_read_consume(a, to_skip)) return (ARCHIVE_FATAL); return ((ssize_t)(bytes_read + to_skip)); } /* * Solaris pax extension for a sparse file. This is recorded with the * data and hole pairs. The way recording sparse information by Solaris' * pax simply indicates where data and sparse are, so the stored contents * consist of both data and hole. */ static int solaris_sparse_parse(struct archive_read *a, struct tar *tar, struct archive_entry *entry, const char *p) { const char *e; int64_t start, end; int hole = 1; (void)entry; /* UNUSED */ end = 0; if (*p == ' ') p++; else return (ARCHIVE_WARN); for (;;) { e = p; while (*e != '\0' && *e != ' ') { if (*e < '0' || *e > '9') return (ARCHIVE_WARN); e++; } start = end; end = tar_atol10(p, e - p); if (end < 0) return (ARCHIVE_WARN); if (start < end) { if (gnu_add_sparse_entry(a, tar, start, end - start) != ARCHIVE_OK) return (ARCHIVE_FATAL); tar->sparse_last->hole = hole; } if (*e == '\0') return (ARCHIVE_OK); p = e + 1; hole = hole == 0; } } /*- * Convert text->integer. * * Traditional tar formats (including POSIX) specify base-8 for * all of the standard numeric fields. This is a significant limitation * in practice: * = file size is limited to 8GB * = rdevmajor and rdevminor are limited to 21 bits * = uid/gid are limited to 21 bits * * There are two workarounds for this: * = pax extended headers, which use variable-length string fields * = GNU tar and STAR both allow either base-8 or base-256 in * most fields. The high bit is set to indicate base-256. * * On read, this implementation supports both extensions. */ static int64_t tar_atol(const char *p, size_t char_cnt) { /* * Technically, GNU tar considers a field to be in base-256 * only if the first byte is 0xff or 0x80. */ if (*p & 0x80) return (tar_atol256(p, char_cnt)); return (tar_atol8(p, char_cnt)); } /* * Note that this implementation does not (and should not!) obey * locale settings; you cannot simply substitute strtol here, since * it does obey locale. */ static int64_t tar_atol_base_n(const char *p, size_t char_cnt, int base) { int64_t l, maxval, limit, last_digit_limit; int digit, sign; maxval = INT64_MAX; limit = INT64_MAX / base; last_digit_limit = INT64_MAX % base; /* the pointer will not be dereferenced if char_cnt is zero * due to the way the && operator is evaluated. */ while (char_cnt != 0 && (*p == ' ' || *p == '\t')) { p++; char_cnt--; } sign = 1; if (char_cnt != 0 && *p == '-') { sign = -1; p++; char_cnt--; maxval = INT64_MIN; limit = -(INT64_MIN / base); last_digit_limit = INT64_MIN % base; } l = 0; if (char_cnt != 0) { digit = *p - '0'; while (digit >= 0 && digit < base && char_cnt != 0) { if (l>limit || (l == limit && digit > last_digit_limit)) { return maxval; /* Truncate on overflow. */ } l = (l * base) + digit; digit = *++p - '0'; char_cnt--; } } return (sign < 0) ? -l : l; } static int64_t tar_atol8(const char *p, size_t char_cnt) { return tar_atol_base_n(p, char_cnt, 8); } static int64_t tar_atol10(const char *p, size_t char_cnt) { return tar_atol_base_n(p, char_cnt, 10); } /* * Parse a base-256 integer. This is just a variable-length * twos-complement signed binary value in big-endian order, except * that the high-order bit is ignored. The values here can be up to * 12 bytes, so we need to be careful about overflowing 64-bit * (8-byte) integers. * * This code unashamedly assumes that the local machine uses 8-bit * bytes and twos-complement arithmetic. */ static int64_t tar_atol256(const char *_p, size_t char_cnt) { uint64_t l; const unsigned char *p = (const unsigned char *)_p; unsigned char c, neg; /* Extend 7-bit 2s-comp to 8-bit 2s-comp, decide sign. */ c = *p; if (c & 0x40) { neg = 0xff; c |= 0x80; l = ~ARCHIVE_LITERAL_ULL(0); } else { neg = 0; c &= 0x7f; l = 0; } /* If more than 8 bytes, check that we can ignore * high-order bits without overflow. */ while (char_cnt > sizeof(int64_t)) { --char_cnt; if (c != neg) return neg ? INT64_MIN : INT64_MAX; c = *++p; } /* c is first byte that fits; if sign mismatch, return overflow */ if ((c ^ neg) & 0x80) { return neg ? INT64_MIN : INT64_MAX; } /* Accumulate remaining bytes. */ while (--char_cnt > 0) { l = (l << 8) | c; c = *++p; } l = (l << 8) | c; /* Return signed twos-complement value. */ return (int64_t)(l); } /* * Returns length of line (including trailing newline) * or negative on error. 'start' argument is updated to * point to first character of line. This avoids copying * when possible. */ static ssize_t readline(struct archive_read *a, struct tar *tar, const char **start, ssize_t limit, size_t *unconsumed) { ssize_t bytes_read; ssize_t total_size = 0; const void *t; const char *s; void *p; tar_flush_unconsumed(a, unconsumed); t = __archive_read_ahead(a, 1, &bytes_read); if (bytes_read <= 0) return (ARCHIVE_FATAL); s = t; /* Start of line? */ p = memchr(t, '\n', bytes_read); /* If we found '\n' in the read buffer, return pointer to that. */ if (p != NULL) { bytes_read = 1 + ((const char *)p) - s; if (bytes_read > limit) { archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, "Line too long"); return (ARCHIVE_FATAL); } *unconsumed = bytes_read; *start = s; return (bytes_read); } *unconsumed = bytes_read; /* Otherwise, we need to accumulate in a line buffer. */ for (;;) { if (total_size + bytes_read > limit) { archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, "Line too long"); return (ARCHIVE_FATAL); } if (archive_string_ensure(&tar->line, total_size + bytes_read) == NULL) { archive_set_error(&a->archive, ENOMEM, "Can't allocate working buffer"); return (ARCHIVE_FATAL); } memcpy(tar->line.s + total_size, t, bytes_read); tar_flush_unconsumed(a, unconsumed); total_size += bytes_read; /* If we found '\n', clean up and return. */ if (p != NULL) { *start = tar->line.s; return (total_size); } /* Read some more. */ t = __archive_read_ahead(a, 1, &bytes_read); if (bytes_read <= 0) return (ARCHIVE_FATAL); s = t; /* Start of line? */ p = memchr(t, '\n', bytes_read); /* If we found '\n', trim the read. */ if (p != NULL) { bytes_read = 1 + ((const char *)p) - s; } *unconsumed = bytes_read; } } /* * base64_decode - Base64 decode * * This accepts most variations of base-64 encoding, including: * * with or without line breaks * * with or without the final group padded with '=' or '_' characters * (The most economical Base-64 variant does not pad the last group and * omits line breaks; RFC1341 used for MIME requires both.) */ static char * base64_decode(const char *s, size_t len, size_t *out_len) { static const unsigned char digits[64] = { 'A','B','C','D','E','F','G','H','I','J','K','L','M','N', 'O','P','Q','R','S','T','U','V','W','X','Y','Z','a','b', 'c','d','e','f','g','h','i','j','k','l','m','n','o','p', 'q','r','s','t','u','v','w','x','y','z','0','1','2','3', '4','5','6','7','8','9','+','/' }; static unsigned char decode_table[128]; char *out, *d; const unsigned char *src = (const unsigned char *)s; /* If the decode table is not yet initialized, prepare it. */ if (decode_table[digits[1]] != 1) { unsigned i; memset(decode_table, 0xff, sizeof(decode_table)); for (i = 0; i < sizeof(digits); i++) decode_table[digits[i]] = i; } /* Allocate enough space to hold the entire output. */ /* Note that we may not use all of this... */ out = (char *)malloc(len - len / 4 + 1); if (out == NULL) { *out_len = 0; return (NULL); } d = out; while (len > 0) { /* Collect the next group of (up to) four characters. */ int v = 0; int group_size = 0; while (group_size < 4 && len > 0) { /* '=' or '_' padding indicates final group. */ if (*src == '=' || *src == '_') { len = 0; break; } /* Skip illegal characters (including line breaks) */ if (*src > 127 || *src < 32 || decode_table[*src] == 0xff) { len--; src++; continue; } v <<= 6; v |= decode_table[*src++]; len --; group_size++; } /* Align a short group properly. */ v <<= 6 * (4 - group_size); /* Unpack the group we just collected. */ switch (group_size) { case 4: d[2] = v & 0xff; /* FALLTHROUGH */ case 3: d[1] = (v >> 8) & 0xff; /* FALLTHROUGH */ case 2: d[0] = (v >> 16) & 0xff; break; case 1: /* this is invalid! */ break; } d += group_size * 3 / 4; } *out_len = d - out; return (out); } static char * url_decode(const char *in) { char *out, *d; const char *s; out = (char *)malloc(strlen(in) + 1); if (out == NULL) return (NULL); for (s = in, d = out; *s != '\0'; ) { if (s[0] == '%' && s[1] != '\0' && s[2] != '\0') { /* Try to convert % escape */ int digit1 = tohex(s[1]); int digit2 = tohex(s[2]); if (digit1 >= 0 && digit2 >= 0) { /* Looks good, consume three chars */ s += 3; /* Convert output */ *d++ = ((digit1 << 4) | digit2); continue; } /* Else fall through and treat '%' as normal char */ } *d++ = *s++; } *d = '\0'; return (out); } static int tohex(int c) { if (c >= '0' && c <= '9') return (c - '0'); else if (c >= 'A' && c <= 'F') return (c - 'A' + 10); else if (c >= 'a' && c <= 'f') return (c - 'a' + 10); else return (-1); }