usr.bin/calendar/io.c

   1 /*-
   2  * Copyright (c) 1989, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #ifndef lint
  31 static const char copyright[] =
  32 "@(#) Copyright (c) 1989, 1993\n\
  33         The Regents of the University of California.  All rights reserved.\n";
  34 #endif
  35
  36 #if 0
  37 #ifndef lint
  38 static char sccsid[] = "@(#)calendar.c  8.3 (Berkeley) 3/25/94";
  39 #endif
  40 #endif
  41
  42 #include <sys/cdefs.h>
  43 __FBSDID("$FreeBSD$");
  44
  45 #include <sys/param.h>
  46 #include <sys/stat.h>
  47 #include <sys/wait.h>
  48 #include <ctype.h>
  49 #include <err.h>
  50 #include <errno.h>
  51 #include <langinfo.h>
  52 #include <locale.h>
  53 #include <pwd.h>
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <string.h>
  57 #include <unistd.h>
  58
  59 #include "pathnames.h"
  60 #include "calendar.h"
  61
  62 const char *calendarFile = "calendar";  /* default calendar file */
  63 const char *calendarHomes[] = {".calendar", _PATH_INCLUDE};     /* HOME */
  64 const char *calendarNoMail = "nomail";  /* don't sent mail if this file exist */
  65
  66 char    path[MAXPATHLEN];
  67
  68 struct fixs neaster, npaskha, ncny, nfullmoon, nnewmoon;
  69 struct fixs nmarequinox, nsepequinox, njunsolstice, ndecsolstice;
  70
  71 #define REPLACE(string, slen, struct_) \
  72                 if (strncasecmp(buf, (string), (slen)) == 0 && buf[(slen)]) { \
  73                         if (struct_.name != NULL)                             \
  74                                 free(struct_.name);                           \
  75                         if ((struct_.name = strdup(buf + (slen))) == NULL)    \
  76                                 errx(1, "cannot allocate memory");            \
  77                         struct_.len = strlen(buf + (slen));                   \
  78                         continue;                                             \
  79                 }
  80 void
  81 cal(void)
  82 {
  83         char *pp, p;
  84         FILE *fp;
  85         int ch, l;
  86         int count, i;
  87         int month[MAXCOUNT];
  88         int day[MAXCOUNT];
  89         int year[MAXCOUNT];
  90         char **extradata;       /* strings of 20 length */
  91         int flags;
  92         static int d_first = -1;
  93         char buf[2048 + 1];
  94         struct event *events[MAXCOUNT];
  95         struct tm tm;
  96         char dbuf[80];
  97
  98         extradata = (char **)calloc(MAXCOUNT, sizeof(char *));
  99         for (i = 0; i < MAXCOUNT; i++) {
 100                 extradata[i] = (char *)calloc(1, 20);
 101         }
 102
 103         /* Unused */
 104         tm.tm_sec = 0;
 105         tm.tm_min = 0;
 106         tm.tm_hour = 0;
 107         tm.tm_wday = 0;
 108
 109         count = 0;
 110         if ((fp = opencal()) == NULL) {
 111                 free(extradata);
 112                 return;
 113         }
 114         while (fgets(buf, sizeof(buf), stdin) != NULL) {
 115                 if ((pp = strchr(buf, '\n')) != NULL)
 116                         *pp = '\0';
 117                 else
 118                         /* Flush this line */
 119                         while ((ch = getchar()) != '\n' && ch != EOF);
 120                 for (l = strlen(buf);
 121                      l > 0 && isspace((unsigned char)buf[l - 1]);
 122                      l--)
 123                         ;
 124                 buf[l] = '\0';
 125                 if (buf[0] == '\0')
 126                         continue;
 127
 128                 /* Parse special definitions: LANG, Easter, Paskha etc */
 129                 if (strncmp(buf, "LANG=", 5) == 0) {
 130                         (void)setlocale(LC_ALL, buf + 5);
 131                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 132                         setnnames();
 133                         continue;
 134                 }
 135                 REPLACE("Easter=", 7, neaster);
 136                 REPLACE("Paskha=", 7, npaskha);
 137                 REPLACE("ChineseNewYear=", 15, ncny);
 138                 REPLACE("NewMoon=", 8, nnewmoon);
 139                 REPLACE("FullMoon=", 9, nfullmoon);
 140                 REPLACE("MarEquinox=", 11, nmarequinox);
 141                 REPLACE("SepEquinox=", 11, nsepequinox);
 142                 REPLACE("JunSolstice=", 12, njunsolstice);
 143                 REPLACE("DecSolstice=", 12, ndecsolstice);
 144                 if (strncmp(buf, "SEQUENCE=", 9) == 0) {
 145                         setnsequences(buf + 9);
 146                         continue;
 147                 }
 148
 149                 /*
 150                  * If the line starts with a tab, the data has to be
 151                  * added to the previous line
 152                  */
 153                 if (buf[0] == '\t') {
 154                         for (i = 0; i < count; i++)
 155                                 event_continue(events[i], buf);
 156                         continue;
 157                 }
 158
 159                 /* Get rid of leading spaces (non-standard) */
 160                 while (isspace((unsigned char)buf[0]))
 161                         memcpy(buf, buf + 1, strlen(buf));
 162
 163                 /* No tab in the line, then not a valid line */
 164                 if ((pp = strchr(buf, '\t')) == NULL)
 165                         continue;
 166
 167                 /* Trim spaces in front of the tab */
 168                 while (isspace((unsigned char)pp[-1]))
 169                         pp--;
 170
 171                 p = *pp;
 172                 *pp = '\0';
 173                 if ((count = parsedaymonth(buf, year, month, day, &flags,
 174                     extradata)) == 0)
 175                         continue;
 176                 *pp = p;
 177                 if (count < 0) {
 178                         /* Show error status based on return value */
 179                         if (debug)
 180                                 fprintf(stderr, "Ignored: %s\n", buf);
 181                         if (count == -1)
 182                                 continue;
 183                         count = -count + 1;
 184                 }
 185
 186                 /* Find the last tab */
 187                 while (pp[1] == '\t')
 188                         pp++;
 189
 190                 if (d_first < 0)
 191                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 192
 193                 for (i = 0; i < count; i++) {
 194                         tm.tm_mon = month[i] - 1;
 195                         tm.tm_mday = day[i];
 196                         tm.tm_year = year[i] - 1900;
 197                         (void)strftime(dbuf, sizeof(dbuf),
 198                             d_first ? "%e %b" : "%b %e", &tm);
 199                         if (debug)
 200                                 fprintf(stderr, "got %s\n", pp);
 201                         events[i] = event_add(year[i], month[i], day[i], dbuf,
 202                             ((flags &= F_VARIABLE) != 0) ? 1 : 0, pp,
 203                             extradata[i]);
 204                 }
 205         }
 206
 207         event_print_all(fp);
 208         closecal(fp);
 209         free(extradata);
 210 }
 211
 212 FILE *
 213 opencal(void)
 214 {
 215         uid_t uid;
 216         size_t i;
 217         int fd, found, pdes[2];
 218         struct stat sbuf;
 219
 220         /* open up calendar file as stdin */
 221         if (!freopen(calendarFile, "r", stdin)) {
 222                 if (doall) {
 223                         if (chdir(calendarHomes[0]) != 0)
 224                                 return (NULL);
 225                         if (stat(calendarNoMail, &sbuf) == 0)
 226                                 return (NULL);
 227                         if (!freopen(calendarFile, "r", stdin))
 228                                 return (NULL);
 229                 } else {
 230                         char *home = getenv("HOME");
 231                         if (home == NULL || *home == '\0')
 232                                 errx(1, "cannot get home directory");
 233                         if (chdir(home) != 0)
 234                                 errx(1, "cannot enter home directory");
 235                         for (found = i = 0; i < sizeof(calendarHomes) /
 236                             sizeof(calendarHomes[0]); i++)
 237                                 if (chdir(calendarHomes[i]) == 0 &&
 238                                     freopen(calendarFile, "r", stdin)) {
 239                                         found = 1;
 240                                         break;
 241                                 }
 242                         if (!found)
 243                                 errx(1,
 244                                     "can't open calendar file \"%s\": %s (%d)",
 245                                     calendarFile, strerror(errno), errno);
 246                 }
 247         }
 248         if (pipe(pdes) < 0)
 249                 return (NULL);
 250         switch (fork()) {
 251         case -1:                        /* error */
 252                 (void)close(pdes[0]);
 253                 (void)close(pdes[1]);
 254                 return (NULL);
 255         case 0:
 256                 /* child -- stdin already setup, set stdout to pipe input */
 257                 if (pdes[1] != STDOUT_FILENO) {
 258                         (void)dup2(pdes[1], STDOUT_FILENO);
 259                         (void)close(pdes[1]);
 260                 }
 261                 (void)close(pdes[0]);
 262                 uid = geteuid();
 263                 if (setuid(getuid()) < 0) {
 264                         warnx("first setuid failed");
 265                         _exit(1);
 266                 };
 267                 if (setgid(getegid()) < 0) {
 268                         warnx("setgid failed");
 269                         _exit(1);
 270                 }
 271                 if (setuid(uid) < 0) {
 272                         warnx("setuid failed");
 273                         _exit(1);
 274                 }
 275                 execl(_PATH_CPP, "cpp", "-P",
 276                     "-traditional", "-nostdinc",        /* GCC specific opts */
 277                     "-I.", "-I", _PATH_INCLUDE, (char *)NULL);
 278                 warn(_PATH_CPP);
 279                 _exit(1);
 280         }
 281         /* parent -- set stdin to pipe output */
 282         (void)dup2(pdes[0], STDIN_FILENO);
 283         (void)close(pdes[0]);
 284         (void)close(pdes[1]);
 285
 286         /* not reading all calendar files, just set output to stdout */
 287         if (!doall)
 288                 return (stdout);
 289
 290         /* set output to a temporary file, so if no output don't send mail */
 291         (void)snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP);
 292         if ((fd = mkstemp(path)) < 0)
 293                 return (NULL);
 294         return (fdopen(fd, "w+"));
 295 }
 296
 297 void
 298 closecal(FILE *fp)
 299 {
 300         uid_t uid;
 301         struct stat sbuf;
 302         int nread, pdes[2], status;
 303         char buf[1024];
 304
 305         if (!doall)
 306                 return;
 307
 308         rewind(fp);
 309         if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
 310                 goto done;
 311         if (pipe(pdes) < 0)
 312                 goto done;
 313         switch (fork()) {
 314         case -1:                        /* error */
 315                 (void)close(pdes[0]);
 316                 (void)close(pdes[1]);
 317                 goto done;
 318         case 0:
 319                 /* child -- set stdin to pipe output */
 320                 if (pdes[0] != STDIN_FILENO) {
 321                         (void)dup2(pdes[0], STDIN_FILENO);
 322                         (void)close(pdes[0]);
 323                 }
 324                 (void)close(pdes[1]);
 325                 uid = geteuid();
 326                 if (setuid(getuid()) < 0) {
 327                         warnx("setuid failed");
 328                         _exit(1);
 329                 };
 330                 if (setgid(getegid()) < 0) {
 331                         warnx("setgid failed");
 332                         _exit(1);
 333                 }
 334                 if (setuid(uid) < 0) {
 335                         warnx("setuid failed");
 336                         _exit(1);
 337                 }
 338                 execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
 339                     "\"Reminder Service\"", (char *)NULL);
 340                 warn(_PATH_SENDMAIL);
 341                 _exit(1);
 342         }
 343         /* parent -- write to pipe input */
 344         (void)close(pdes[0]);
 345
 346         write(pdes[1], "From: \"Reminder Service\" <", 26);
 347         write(pdes[1], pw->pw_name, strlen(pw->pw_name));
 348         write(pdes[1], ">\nTo: <", 7);
 349         write(pdes[1], pw->pw_name, strlen(pw->pw_name));
 350         write(pdes[1], ">\nSubject: ", 11);
 351         write(pdes[1], dayname, strlen(dayname));
 352         write(pdes[1], "'s Calendar\nPrecedence: bulk\n\n", 30);
 353
 354         while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
 355                 (void)write(pdes[1], buf, nread);
 356         (void)close(pdes[1]);
 357 done:   (void)fclose(fp);
 358         (void)unlink(path);
 359         while (wait(&status) >= 0);
 360 }