1 /* $NetBSD: getnetconfig.c,v 1.3 2000/07/06 03:10:34 christos Exp $ */
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33 #if defined(LIBC_SCCS) && !defined(lint)
34 static char sccsid[] = "@(#)getnetconfig.c 1.12 91/12/19 SMI";
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
40 * Copyright (c) 1989 by Sun Microsystems, Inc.
43 #include "namespace.h"
44 #include "reentrant.h"
47 #include <netconfig.h>
53 #include "un-namespace.h"
57 * The five library routines in this file provide application access to the
58 * system network configuration database, /etc/netconfig. In addition to the
59 * netconfig database and the routines for accessing it, the environment
60 * variable NETPATH and its corresponding routines in getnetpath.c may also be
61 * used to specify the network transport to be used.
69 #define NC_NONETCONFIG ENOENT
70 #define NC_NOMEM ENOMEM
71 #define NC_NOTINIT EINVAL /* setnetconfig was not called first */
72 #define NC_BADFILE EBADF /* format for netconfig file is bad */
73 #define NC_NOTFOUND ENOPROTOOPT /* specified netid was not found */
76 * semantics as strings (should be in netconfig.h)
78 #define NC_TPI_CLTS_S "tpi_clts"
79 #define NC_TPI_COTS_S "tpi_cots"
80 #define NC_TPI_COTS_ORD_S "tpi_cots_ord"
81 #define NC_TPI_RAW_S "tpi_raw"
84 * flags as characters (also should be in netconfig.h)
86 #define NC_NOFLAG_C '-'
87 #define NC_VISIBLE_C 'v'
88 #define NC_BROADCAST_C 'b'
91 * Character used to indicate there is no name-to-address lookup library
93 #define NC_NOLOOKUP "-"
95 static const char * const _nc_errors[] = {
96 "Netconfig database not found",
99 "Netconfig database has invalid format",
100 "Netid not found in netconfig database"
103 struct netconfig_info {
104 int eof; /* all entries has been read */
105 int ref; /* # of times setnetconfig() has been called */
106 struct netconfig_list *head; /* head of the list */
107 struct netconfig_list *tail; /* last of the list */
110 struct netconfig_list {
111 char *linep; /* hold line read from netconfig */
112 struct netconfig *ncp;
113 struct netconfig_list *next;
116 struct netconfig_vars {
117 int valid; /* token that indicates a valid netconfig_vars */
118 int flag; /* first time flag */
119 struct netconfig_list *nc_configs; /* pointer to the current netconfig entry */
122 #define NC_VALID 0xfeed
123 #define NC_STORAGE 0xf00d
127 static int *__nc_error(void);
128 static int parse_ncp(char *, struct netconfig *);
129 static struct netconfig *dup_ncp(struct netconfig *);
132 static FILE *nc_file; /* for netconfig db */
133 static struct netconfig_info ni = { 0, 0, NULL, NULL};
135 #define MAXNETCONFIGLINE 1000
140 static pthread_mutex_t nc_lock = PTHREAD_MUTEX_INITIALIZER;
141 static thread_key_t nc_key = 0;
142 static int nc_error = 0;
146 * Use the static `nc_error' if we are the main thread
147 * (including non-threaded programs), or if an allocation
154 mutex_lock(&nc_lock);
156 error = thr_keycreate(&nc_key, free);
157 mutex_unlock(&nc_lock);
161 if ((nc_addr = (int *)thr_getspecific(nc_key)) == NULL) {
162 nc_addr = (int *)malloc(sizeof (int));
163 if (thr_setspecific(nc_key, (void *) nc_addr) != 0) {
173 #define nc_error (*(__nc_error()))
175 * A call to setnetconfig() establishes a /etc/netconfig "session". A session
176 * "handle" is returned on a successful call. At the start of a session (after
177 * a call to setnetconfig()) searches through the /etc/netconfig database will
178 * proceed from the start of the file. The session handle must be passed to
179 * getnetconfig() to parse the file. Each call to getnetconfig() using the
180 * current handle will process one subsequent entry in /etc/netconfig.
181 * setnetconfig() must be called before the first call to getnetconfig().
182 * (Handles are used to allow for nested calls to setnetpath()).
184 * A new session is established with each call to setnetconfig(), with a new
185 * handle being returned on each call. Previously established sessions remain
186 * active until endnetconfig() is called with that session's handle as an
189 * setnetconfig() need *not* be called before a call to getnetconfigent().
190 * setnetconfig() returns a NULL pointer on failure (for example, if
191 * the netconfig database is not present).
196 struct netconfig_vars *nc_vars;
198 if ((nc_vars = (struct netconfig_vars *)malloc(sizeof
199 (struct netconfig_vars))) == NULL) {
204 * For multiple calls, i.e. nc_file is not NULL, we just return the
205 * handle without reopening the netconfig db.
208 if ((nc_file != NULL) || (nc_file = fopen(NETCONFIG, "r")) != NULL) {
209 nc_vars->valid = NC_VALID;
211 nc_vars->nc_configs = ni.head;
212 return ((void *)nc_vars);
215 nc_error = NC_NONETCONFIG;
222 * When first called, getnetconfig() returns a pointer to the first entry in
223 * the netconfig database, formatted as a struct netconfig. On each subsequent
224 * call, getnetconfig() returns a pointer to the next entry in the database.
225 * getnetconfig() can thus be used to search the entire netconfig file.
226 * getnetconfig() returns NULL at end of file.
230 getnetconfig(handlep)
233 struct netconfig_vars *ncp = (struct netconfig_vars *)handlep;
234 char *stringp; /* tmp string pointer */
235 struct netconfig_list *list;
236 struct netconfig *np;
239 * Verify that handle is valid
241 if (ncp == NULL || nc_file == NULL) {
242 nc_error = NC_NOTINIT;
246 switch (ncp->valid) {
249 * If entry has already been read into the list,
250 * we return the entry in the linked list.
251 * If this is the first time call, check if there are any entries in
252 * linked list. If no entries, we need to read the netconfig db.
253 * If we have been here and the next entry is there, we just return
256 if (ncp->flag == 0) { /* first time */
258 ncp->nc_configs = ni.head;
259 if (ncp->nc_configs != NULL) /* entry already exist */
260 return(ncp->nc_configs->ncp);
262 else if (ncp->nc_configs != NULL && ncp->nc_configs->next != NULL) {
263 ncp->nc_configs = ncp->nc_configs->next;
264 return(ncp->nc_configs->ncp);
268 * If we cannot find the entry in the list and is end of file,
271 if (ni.eof == 1) return(NULL);
274 nc_error = NC_NOTINIT;
278 stringp = (char *) malloc(MAXNETCONFIGLINE);
283 if (malloc_verify() == 0) {
284 fprintf(stderr, "memory heap corrupted in getnetconfig\n");
290 * Read a line from netconfig file.
293 if (fgets(stringp, MAXNETCONFIGLINE, nc_file) == NULL) {
298 } while (*stringp == '#');
300 list = (struct netconfig_list *) malloc(sizeof (struct netconfig_list));
305 np = (struct netconfig *) malloc(sizeof (struct netconfig));
313 list->ncp->nc_lookups = NULL;
314 list->linep = stringp;
315 if (parse_ncp(stringp, list->ncp) == -1) {
323 * If this is the first entry that's been read, it is the head of
324 * the list. If not, put the entry at the end of the list.
325 * Reposition the current pointer of the handle to the last entry
328 if (ni.head == NULL) { /* first entry */
329 ni.head = ni.tail = list;
332 ni.tail->next = list;
333 ni.tail = ni.tail->next;
335 ncp->nc_configs = ni.tail;
336 return(ni.tail->ncp);
341 * endnetconfig() may be called to "unbind" or "close" the netconfig database
342 * when processing is complete, releasing resources for reuse. endnetconfig()
343 * may not be called before setnetconfig(). endnetconfig() returns 0 on
344 * success and -1 on failure (for example, if setnetconfig() was not called
348 endnetconfig(handlep)
351 struct netconfig_vars *nc_handlep = (struct netconfig_vars *)handlep;
353 struct netconfig_list *q, *p;
356 * Verify that handle is valid
358 if (nc_handlep == NULL || (nc_handlep->valid != NC_VALID &&
359 nc_handlep->valid != NC_STORAGE)) {
360 nc_error = NC_NOTINIT;
365 * Return 0 if anyone still needs it.
367 nc_handlep->valid = NC_INVALID;
368 nc_handlep->flag = 0;
369 nc_handlep->nc_configs = NULL;
376 * Noone needs these entries anymore, then frees them.
377 * Make sure all info in netconfig_info structure has been reinitialized.
385 if (q->ncp->nc_lookups != NULL) free(q->ncp->nc_lookups);
399 * getnetconfigent(netid) returns a pointer to the struct netconfig structure
400 * corresponding to netid. It returns NULL if netid is invalid (that is, does
401 * not name an entry in the netconfig database). It returns NULL and sets
402 * errno in case of failure (for example, if the netconfig database cannot be
407 getnetconfigent(netid)
410 FILE *file; /* NETCONFIG db's file pointer */
411 char *linep; /* holds current netconfig line */
412 char *stringp; /* temporary string pointer */
413 struct netconfig *ncp = NULL; /* returned value */
414 struct netconfig_list *list; /* pointer to cache list */
416 nc_error = NC_NOTFOUND; /* default error. */
417 if (netid == NULL || strlen(netid) == 0) {
421 if (strcmp(netid, "unix") == 0) {
422 fprintf(stderr, "The local transport is called \"unix\" ");
423 fprintf(stderr, "in /etc/netconfig.\n");
424 fprintf(stderr, "Please change this to \"local\" manually ");
425 fprintf(stderr, "or run mergemaster(8).\n");
426 fprintf(stderr, "See UPDATING entry 20021216 for details.\n");
427 fprintf(stderr, "Continuing in 10 seconds\n\n");
428 fprintf(stderr, "This warning will be removed 20030301\n");
434 * Look up table if the entries have already been read and parsed in
435 * getnetconfig(), then copy this entry into a buffer and return it.
436 * If we cannot find the entry in the current list and there are more
437 * entries in the netconfig db that has not been read, we then read the
438 * db and try find the match netid.
439 * If all the netconfig db has been read and placed into the list and
440 * there is no match for the netid, return NULL.
442 if (ni.head != NULL) {
443 for (list = ni.head; list; list = list->next) {
444 if (strcmp(list->ncp->nc_netid, netid) == 0) {
445 return(dup_ncp(list->ncp));
448 if (ni.eof == 1) /* that's all the entries */
453 if ((file = fopen(NETCONFIG, "r")) == NULL) {
454 nc_error = NC_NONETCONFIG;
458 if ((linep = malloc(MAXNETCONFIGLINE)) == NULL) {
465 char *tmpp; /* tmp string pointer */
468 if ((stringp = fgets(linep, MAXNETCONFIGLINE, file)) == NULL) {
471 } while (*stringp == '#');
472 if (stringp == NULL) { /* eof */
475 if ((tmpp = strpbrk(stringp, "\t ")) == NULL) { /* can't parse file */
476 nc_error = NC_BADFILE;
479 if (strlen(netid) == (size_t) (len = tmpp - stringp) && /* a match */
480 strncmp(stringp, netid, (size_t)len) == 0) {
481 if ((ncp = (struct netconfig *)
482 malloc(sizeof (struct netconfig))) == NULL) {
485 ncp->nc_lookups = NULL;
486 if (parse_ncp(linep, ncp) == -1) {
492 } while (stringp != NULL);
501 * freenetconfigent(netconfigp) frees the netconfig structure pointed to by
502 * netconfigp (previously returned by getnetconfigent()).
506 freenetconfigent(netconfigp)
507 struct netconfig *netconfigp;
509 if (netconfigp != NULL) {
510 free(netconfigp->nc_netid); /* holds all netconfigp's strings */
511 if (netconfigp->nc_lookups != NULL)
512 free(netconfigp->nc_lookups);
519 * Parse line and stuff it in a struct netconfig
520 * Typical line might look like:
521 * udp tpi_cots vb inet udp /dev/udp /usr/lib/ip.so,/usr/local/ip.so
523 * We return -1 if any of the tokens don't parse, or malloc fails.
525 * Note that we modify stringp (putting NULLs after tokens) and
526 * we set the ncp's string field pointers to point to these tokens within
531 parse_ncp(stringp, ncp)
532 char *stringp; /* string to parse */
533 struct netconfig *ncp; /* where to put results */
535 char *tokenp; /* for processing tokens */
539 nc_error = NC_BADFILE; /* nearly anything that breaks is for this reason */
540 stringp[strlen(stringp)-1] = '\0'; /* get rid of newline */
542 if ((ncp->nc_netid = strtok_r(stringp, "\t ", &lasts)) == NULL) {
547 if ((tokenp = strtok_r(NULL, "\t ", &lasts)) == NULL) {
550 if (strcmp(tokenp, NC_TPI_COTS_ORD_S) == 0)
551 ncp->nc_semantics = NC_TPI_COTS_ORD;
552 else if (strcmp(tokenp, NC_TPI_COTS_S) == 0)
553 ncp->nc_semantics = NC_TPI_COTS;
554 else if (strcmp(tokenp, NC_TPI_CLTS_S) == 0)
555 ncp->nc_semantics = NC_TPI_CLTS;
556 else if (strcmp(tokenp, NC_TPI_RAW_S) == 0)
557 ncp->nc_semantics = NC_TPI_RAW;
562 if ((tokenp = strtok_r(NULL, "\t ", &lasts)) == NULL) {
565 for (ncp->nc_flag = NC_NOFLAG; *tokenp != '\0';
571 ncp->nc_flag |= NC_VISIBLE;
574 ncp->nc_flag |= NC_BROADCAST;
580 /* protocol family */
581 if ((ncp->nc_protofmly = strtok_r(NULL, "\t ", &lasts)) == NULL) {
585 if ((ncp->nc_proto = strtok_r(NULL, "\t ", &lasts)) == NULL) {
589 if ((ncp->nc_device = strtok_r(NULL, "\t ", &lasts)) == NULL) {
592 if ((tokenp = strtok_r(NULL, "\t ", &lasts)) == NULL) {
595 if (strcmp(tokenp, NC_NOLOOKUP) == 0) {
596 ncp->nc_nlookups = 0;
597 ncp->nc_lookups = NULL;
599 char *cp; /* tmp string */
601 if (ncp->nc_lookups != NULL) /* from last visit */
602 free(ncp->nc_lookups);
603 ncp->nc_lookups = NULL;
604 ncp->nc_nlookups = 0;
605 while ((cp = tokenp) != NULL) {
606 if ((nc_lookups = realloc(ncp->nc_lookups,
607 (ncp->nc_nlookups + 1) * sizeof *ncp->nc_lookups)) == NULL) {
608 free(ncp->nc_lookups);
609 ncp->nc_lookups = NULL;
612 tokenp = _get_next_token(cp, ',');
613 ncp->nc_lookups = nc_lookups;
614 ncp->nc_lookups[ncp->nc_nlookups++] = cp;
622 * Returns a string describing the reason for failure.
631 message = _nc_errors[0];
634 message = _nc_errors[1];
637 message = _nc_errors[2];
640 message = _nc_errors[3];
643 message = _nc_errors[4];
646 message = "Unknown network selection error";
648 /* LINTED const castaway */
649 return ((char *)message);
653 * Prints a message onto standard error describing the reason for failure.
659 fprintf(stderr, "%s: %s\n", s, nc_sperror());
663 * Duplicates the matched netconfig buffer.
665 static struct netconfig *
667 struct netconfig *ncp;
673 if ((tmp=malloc(MAXNETCONFIGLINE)) == NULL)
675 if ((p=(struct netconfig *)malloc(sizeof(struct netconfig))) == NULL) {
680 * First we dup all the data from matched netconfig buffer. Then we
681 * adjust some of the member pointer to a pre-allocated buffer where
682 * contains part of the data.
683 * To follow the convention used in parse_ncp(), we store all the
684 * necessary information in the pre-allocated buffer and let each
685 * of the netconfig char pointer member point to the right address
689 p->nc_netid = (char *)strcpy(tmp,ncp->nc_netid);
690 tmp = strchr(tmp, '\0') + 1;
691 p->nc_protofmly = (char *)strcpy(tmp,ncp->nc_protofmly);
692 tmp = strchr(tmp, '\0') + 1;
693 p->nc_proto = (char *)strcpy(tmp,ncp->nc_proto);
694 tmp = strchr(tmp, '\0') + 1;
695 p->nc_device = (char *)strcpy(tmp,ncp->nc_device);
696 p->nc_lookups = (char **)malloc((size_t)(p->nc_nlookups+1) * sizeof(char *));
697 if (p->nc_lookups == NULL) {
702 for (i=0; i < p->nc_nlookups; i++) {
703 tmp = strchr(tmp, '\0') + 1;
704 p->nc_lookups[i] = (char *)strcpy(tmp,ncp->nc_lookups[i]);