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 static const char *calendarHomes[] = {".calendar", _PATH_INCLUDE}; /* HOME */
  64 static const char *calendarNoMail = "nomail";/* don't sent mail if file exist */
  65
  66 static 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 *fpin;
  85         FILE *fpout;
  86         int l;
  87         int count, i;
  88         int month[MAXCOUNT];
  89         int day[MAXCOUNT];
  90         int year[MAXCOUNT];
  91         char **extradata;       /* strings of 20 length */
  92         int flags;
  93         static int d_first = -1;
  94         char buf[2048 + 1];
  95         struct event *events[MAXCOUNT];
  96         struct tm tm;
  97         char dbuf[80];
  98
  99         initcpp();
 100         extradata = (char **)calloc(MAXCOUNT, sizeof(char *));
 101         for (i = 0; i < MAXCOUNT; i++) {
 102                 extradata[i] = (char *)calloc(1, 20);
 103         }
 104
 105         /* Unused */
 106         tm.tm_sec = 0;
 107         tm.tm_min = 0;
 108         tm.tm_hour = 0;
 109         tm.tm_wday = 0;
 110
 111         count = 0;
 112         if ((fpin = opencalin()) == NULL) {
 113                 free(extradata);
 114                 return;
 115         }
 116         if ((fpout = opencalout()) == NULL) {
 117                 fclose(fpin);
 118                 free(extradata);
 119                 return;
 120         }
 121         while ((fpin = fincludegets(buf, sizeof(buf), fpin)) != NULL) {
 122                 if (*buf == '\0')
 123                         continue;
 124                 for (l = strlen(buf);
 125                      l > 0 && isspace((unsigned char)buf[l - 1]);
 126                      l--)
 127                         ;
 128                 buf[l] = '\0';
 129                 if (buf[0] == '\0')
 130                         continue;
 131
 132                 /* Parse special definitions: LANG, Easter, Paskha etc */
 133                 if (strncmp(buf, "LANG=", 5) == 0) {
 134                         (void)setlocale(LC_ALL, buf + 5);
 135                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 136                         setnnames();
 137                         continue;
 138                 }
 139                 REPLACE("Easter=", 7, neaster);
 140                 REPLACE("Paskha=", 7, npaskha);
 141                 REPLACE("ChineseNewYear=", 15, ncny);
 142                 REPLACE("NewMoon=", 8, nnewmoon);
 143                 REPLACE("FullMoon=", 9, nfullmoon);
 144                 REPLACE("MarEquinox=", 11, nmarequinox);
 145                 REPLACE("SepEquinox=", 11, nsepequinox);
 146                 REPLACE("JunSolstice=", 12, njunsolstice);
 147                 REPLACE("DecSolstice=", 12, ndecsolstice);
 148                 if (strncmp(buf, "SEQUENCE=", 9) == 0) {
 149                         setnsequences(buf + 9);
 150                         continue;
 151                 }
 152
 153                 /*
 154                  * If the line starts with a tab, the data has to be
 155                  * added to the previous line
 156                  */
 157                 if (buf[0] == '\t') {
 158                         for (i = 0; i < count; i++)
 159                                 event_continue(events[i], buf);
 160                         continue;
 161                 }
 162
 163                 /* Get rid of leading spaces (non-standard) */
 164                 while (isspace((unsigned char)buf[0]))
 165                         memcpy(buf, buf + 1, strlen(buf));
 166
 167                 /* No tab in the line, then not a valid line */
 168                 if ((pp = strchr(buf, '\t')) == NULL)
 169                         continue;
 170
 171                 /* Trim spaces in front of the tab */
 172                 while (isspace((unsigned char)pp[-1]))
 173                         pp--;
 174
 175                 p = *pp;
 176                 *pp = '\0';
 177                 if ((count = parsedaymonth(buf, year, month, day, &flags,
 178                     extradata)) == 0)
 179                         continue;
 180                 *pp = p;
 181                 if (count < 0) {
 182                         /* Show error status based on return value */
 183                         if (debug)
 184                                 fprintf(stderr, "Ignored: %s\n", buf);
 185                         if (count == -1)
 186                                 continue;
 187                         count = -count + 1;
 188                 }
 189
 190                 /* Find the last tab */
 191                 while (pp[1] == '\t')
 192                         pp++;
 193
 194                 if (d_first < 0)
 195                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 196
 197                 for (i = 0; i < count; i++) {
 198                         tm.tm_mon = month[i] - 1;
 199                         tm.tm_mday = day[i];
 200                         tm.tm_year = year[i] - 1900;
 201                         (void)strftime(dbuf, sizeof(dbuf),
 202                             d_first ? "%e %b" : "%b %e", &tm);
 203                         if (debug)
 204                                 fprintf(stderr, "got %s\n", pp);
 205                         events[i] = event_add(year[i], month[i], day[i], dbuf,
 206                             ((flags &= F_VARIABLE) != 0) ? 1 : 0, pp,
 207                             extradata[i]);
 208                 }
 209         }
 210
 211         event_print_all(fpout);
 212         closecal(fpout);
 213         free(extradata);
 214 }
 215
 216 FILE *
 217 opencalin(void)
 218 {
 219         size_t i;
 220         int found;
 221         struct stat sbuf;
 222         FILE *fpin;
 223
 224         /* open up calendar file */
 225         if ((fpin = fopen(calendarFile, "r")) == NULL) {
 226                 if (doall) {
 227                         if (chdir(calendarHomes[0]) != 0)
 228                                 return (NULL);
 229                         if (stat(calendarNoMail, &sbuf) == 0)
 230                                 return (NULL);
 231                         if ((fpin = fopen(calendarFile, "r")) == NULL)
 232                                 return (NULL);
 233                 } else {
 234                         char *home = getenv("HOME");
 235                         if (home == NULL || *home == '\0')
 236                                 errx(1, "cannot get home directory");
 237                         if (chdir(home) != 0)
 238                                 errx(1, "cannot enter home directory");
 239                         for (found = i = 0; i < sizeof(calendarHomes) /
 240                             sizeof(calendarHomes[0]); i++)
 241                                 if (chdir(calendarHomes[i]) == 0 &&
 242                                     (fpin = fopen(calendarFile, "r")) != NULL) {
 243                                         found = 1;
 244                                         break;
 245                                 }
 246                         if (!found)
 247                                 errx(1,
 248                                     "can't open calendar file \"%s\": %s (%d)",
 249                                     calendarFile, strerror(errno), errno);
 250                 }
 251         }
 252         return (fpin);
 253 }
 254
 255 FILE *
 256 opencalout(void)
 257 {
 258         int fd;
 259
 260         /* not reading all calendar files, just set output to stdout */
 261         if (!doall)
 262                 return (stdout);
 263
 264         /* set output to a temporary file, so if no output don't send mail */
 265         snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP);
 266         if ((fd = mkstemp(path)) < 0)
 267                 return (NULL);
 268         return (fdopen(fd, "w+"));
 269 }
 270
 271 void
 272 closecal(FILE *fp)
 273 {
 274         uid_t uid;
 275         struct stat sbuf;
 276         int nread, pdes[2], status;
 277         char buf[1024];
 278
 279         if (!doall)
 280                 return;
 281
 282         rewind(fp);
 283         if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
 284                 goto done;
 285         if (pipe(pdes) < 0)
 286                 goto done;
 287         switch (fork()) {
 288         case -1:                        /* error */
 289                 (void)close(pdes[0]);
 290                 (void)close(pdes[1]);
 291                 goto done;
 292         case 0:
 293                 /* child -- set stdin to pipe output */
 294                 if (pdes[0] != STDIN_FILENO) {
 295                         (void)dup2(pdes[0], STDIN_FILENO);
 296                         (void)close(pdes[0]);
 297                 }
 298                 (void)close(pdes[1]);
 299                 uid = geteuid();
 300                 if (setuid(getuid()) < 0) {
 301                         warnx("setuid failed");
 302                         _exit(1);
 303                 };
 304                 if (setgid(getegid()) < 0) {
 305                         warnx("setgid failed");
 306                         _exit(1);
 307                 }
 308                 if (setuid(uid) < 0) {
 309                         warnx("setuid failed");
 310                         _exit(1);
 311                 }
 312                 execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
 313                     "\"Reminder Service\"", (char *)NULL);
 314                 warn(_PATH_SENDMAIL);
 315                 _exit(1);
 316         }
 317         /* parent -- write to pipe input */
 318         (void)close(pdes[0]);
 319
 320         write(pdes[1], "From: \"Reminder Service\" <", 26);
 321         write(pdes[1], pw->pw_name, strlen(pw->pw_name));
 322         write(pdes[1], ">\nTo: <", 7);
 323         write(pdes[1], pw->pw_name, strlen(pw->pw_name));
 324         write(pdes[1], ">\nSubject: ", 11);
 325         write(pdes[1], dayname, strlen(dayname));
 326         write(pdes[1], "'s Calendar\nPrecedence: bulk\n\n", 30);
 327
 328         while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
 329                 (void)write(pdes[1], buf, nread);
 330         (void)close(pdes[1]);
 331 done:   (void)fclose(fp);
 332         (void)unlink(path);
 333         while (wait(&status) >= 0);
 334 }