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  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1989, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)calendar.c  8.3 (Berkeley) 3/25/94
  35  * $FreeBSD: src/usr.bin/calendar/io.c,v 1.21 2007/06/09 05:54:13 grog Exp $
  36  */
  37
  38 #include <sys/types.h>
  39 #include <sys/stat.h>
  40 #include <sys/time.h>
  41 #include <sys/uio.h>
  42 #include <sys/wait.h>
  43
  44 #include <ctype.h>
  45 #include <err.h>
  46 #include <errno.h>
  47 #include <langinfo.h>
  48 #include <locale.h>
  49 #include <pwd.h>
  50 #include <stdio.h>
  51 #include <stdlib.h>
  52 #include <string.h>
  53 #include <unistd.h>
  54
  55 #include "pathnames.h"
  56 #include "calendar.h"
  57
  58 const char *calendarFile = "calendar.all";  /* default calendar file */
  59 const char *calendarHomes[] = { ".calendar", _PATH_INCLUDE }; /* HOME */
  60 const char *calendarNoMail = "nomail";  /* don't send mail if this file exist */
  61
  62 struct fixs neaster, npaskha;
  63
  64 char    hdr_from[] = "From: ";
  65 char    hdr_to[] = " (Reminder Service)\nTo: ";
  66 char    hdr_subj[] = "\nSubject: ";
  67 char    hdr_prec[] = "'s Calendar\nPrecedence: bulk\n\n";
  68
  69 struct iovec header[] = {
  70         {hdr_from, 6},
  71         {NULL, 0},
  72         {hdr_to, 24},
  73         {NULL, 0},
  74         {hdr_subj, 10},
  75         {NULL, 0},
  76         {hdr_prec, 30},
  77 };
  78
  79 static FILE     *opencal(void);
  80 static void      closecal(FILE *);
  81
  82 void
  83 cal(void)
  84 {
  85         int printing;
  86         char *p;
  87         FILE *fp;
  88         int ch, l;
  89         int month;
  90         int day;
  91         int var;
  92         static int d_first = -1;
  93         char buf[2048 + 1];
  94         struct event *events = NULL;
  95
  96         if ((fp = opencal()) == NULL)
  97                 return;
  98         for (printing = 0; fgets(buf, sizeof(buf), stdin) != NULL;) {
  99                 if ((p = strchr(buf, '\n')) != NULL)
 100                         *p = '\0';
 101                 else
 102                         while ((ch = getchar()) != '\n' && ch != EOF);
 103                 for (l = strlen(buf);
 104                      l > 0 && isspace((unsigned char)buf[l - 1]);
 105                      l--)
 106                         ;
 107                 buf[l] = '\0';
 108                 if (buf[0] == '\0')
 109                         continue;
 110                 if (strncmp(buf, "LANG=", 5) == 0) {
 111                         setlocale(LC_ALL, buf + 5);
 112                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 113                         setnnames();
 114                         continue;
 115                 }
 116                 if (strncasecmp(buf, "Easter=", 7) == 0 && buf[7]) {
 117                         if (neaster.name != NULL)
 118                                 free(neaster.name);
 119                         if ((neaster.name = strdup(buf + 7)) == NULL)
 120                                 errx(EXIT_FAILURE, "cannot allocate memory");
 121                         neaster.len = strlen(buf + 7);
 122                         continue;
 123                 }
 124                 if (strncasecmp(buf, "Paskha=", 7) == 0 && buf[7]) {
 125                         if (npaskha.name != NULL)
 126                                 free(npaskha.name);
 127                         if ((npaskha.name = strdup(buf + 7)) == NULL)
 128                                 errx(EXIT_FAILURE, "cannot allocate memory");
 129                         npaskha.len = strlen(buf + 7);
 130                         continue;
 131                 }
 132                 if (buf[0] != '\t') {
 133                         printing = isnow(buf, &month, &day, &var) ? 1 : 0;
 134                         if ((p = strchr(buf, '\t')) == NULL)
 135                                 continue;
 136                         if (p > buf && p[-1] == '*')
 137                                 var = 1;
 138                         if (printing) {
 139                                 struct tm tm;
 140                                 char dbuf[80];
 141
 142                                 if (d_first < 0)
 143                                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 144                                 tm.tm_sec = 0;  /* unused */
 145                                 tm.tm_min = 0;  /* unused */
 146                                 tm.tm_hour = 0; /* unused */
 147                                 tm.tm_wday = 0; /* unused */
 148                                 tm.tm_mon = month - 1;
 149                                 tm.tm_mday = day;
 150                                 tm.tm_year = tp->tm_year; /* unused */
 151                                 strftime(dbuf, sizeof(dbuf),
 152                                     d_first ? "%e %b" : "%b %e",
 153                                     &tm);
 154                                 events = event_add(events, month, day, dbuf, var, p);
 155                         }
 156                 }
 157                 else if (printing)
 158                         event_continue(events, buf);
 159         }
 160
 161         event_print_all(fp, events);
 162         closecal(fp);
 163 }
 164
 165 /*
 166  * Functions to handle buffered calendar events.
 167  */
 168 struct event *
 169 event_add(struct event *events, int month, int day, char *date, int var, char *txt)
 170 {
 171         struct event *e;
 172
 173         e = (struct event *)calloc(1, sizeof(struct event));
 174         if (e == NULL)
 175                 errx(EXIT_FAILURE, "event_add: cannot allocate memory");
 176         e->month = month;
 177         e->day = day;
 178         e->var = var;
 179         e->date = strdup(date);
 180         if (e->date == NULL)
 181                 errx(EXIT_FAILURE, "event_add: cannot allocate memory");
 182         e->text = strdup(txt);
 183         if (e->text == NULL)
 184                 errx(EXIT_FAILURE, "event_add: cannot allocate memory");
 185         e->next = events;
 186
 187         return e;
 188 }
 189
 190 void
 191 event_continue(struct event *e, char *txt)
 192 {
 193         char *text;
 194
 195         text = strdup(e->text);
 196         if (text == NULL)
 197                 errx(EXIT_FAILURE, "event_continue: cannot allocate memory");
 198
 199         free(e->text);
 200         e->text = (char *)malloc(strlen(text) + strlen(txt) + 3);
 201         if (e->text == NULL)
 202                 errx(EXIT_FAILURE, "event_continue: cannot allocate memory");
 203         strcpy(e->text, text);
 204         strcat(e->text, "\n");
 205         strcat(e->text, txt);
 206         free(text);
 207
 208         return;
 209 }
 210
 211 void
 212 event_print_all(FILE *fp, struct event *events)
 213 {
 214         struct event *e, *e_next;
 215         int daycount = f_dayAfter + f_dayBefore;
 216         int daycounter;
 217         int day, month;
 218
 219         for (daycounter = 0; daycounter <= daycount; daycounter++) {
 220                 day = tp->tm_yday - f_dayBefore + daycounter;
 221                 if (day < 0) day += yrdays;
 222                 if (day >= yrdays) day -= yrdays;
 223
 224                 month = 1;
 225                 while (month <= 12) {
 226                         if (day <= cumdays[month])
 227                                 break;
 228                         month++;
 229                 }
 230                 month--;
 231                 day -= cumdays[month];
 232
 233 #ifdef DEBUG
 234                 fprintf(stderr,"event_print_allmonth: %d, day: %d\n",month,day);
 235 #endif
 236
 237                 for (e = events; e != NULL; e = e_next ) {
 238                         e_next = e->next;
 239
 240                         if (month != e->month || day != e->day)
 241                                 continue;
 242
 243                         fprintf(fp, "%s%c%s\n", e->date,
 244                             e->var ? '*' : ' ', e->text);
 245                 }
 246         }
 247 }
 248
 249 int
 250 getfield(char *p, char **endp, int *flags)
 251 {
 252         int val, var;
 253         char *start, savech;
 254
 255         for (; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p)
 256                && *p != '*'; ++p);
 257         if (*p == '*') {                        /* `*' is current month */
 258                 *flags |= F_ISMONTH;
 259                 *endp = p+1;
 260                 return(tp->tm_mon + 1);
 261         }
 262         if (isdigit((unsigned char)*p)) {
 263                 val = strtol(p, &p, 10);        /* if 0, it's failure */
 264                 for (; !isdigit((unsigned char)*p)
 265                        && !isalpha((unsigned char)*p) && *p != '*'; ++p);
 266                 *endp = p;
 267                 return(val);
 268         }
 269         for (start = p; isalpha((unsigned char)*++p););
 270
 271         /* Sunday-1 */
 272         if (*p == '+' || *p == '-')
 273             for(; isdigit((unsigned char)*++p););
 274
 275         savech = *p;
 276         *p = '\0';
 277
 278         /* Month */
 279         if ((val = getmonth(start)) != 0)
 280                 *flags |= F_ISMONTH;
 281
 282         /* Day */
 283         else if ((val = getday(start)) != 0) {
 284             *flags |= F_ISDAY;
 285
 286             /* variable weekday */
 287             if ((var = getdayvar(start)) != 0) {
 288                 if (var <=5 && var >= -4)
 289                     val += var * 10;
 290 #ifdef DEBUG
 291                 printf("var: %d\n", var);
 292 #endif
 293             }
 294         }
 295
 296         /* Easter */
 297         else if ((val = geteaster(start, tp->tm_year + 1900)) != 0)
 298             *flags |= F_EASTER;
 299
 300         /* Paskha */
 301         else if ((val = getpaskha(start, tp->tm_year + 1900)) != 0)
 302             *flags |= F_EASTER;
 303
 304         /* undefined rest */
 305         else {
 306                 *p = savech;
 307                 return (0);
 308         }
 309         for (*p = savech; !isdigit((unsigned char)*p)
 310                && !isalpha((unsigned char)*p) && *p != '*'; ++p);
 311         *endp = p;
 312         return(val);
 313 }
 314
 315 static char path[MAXPATHLEN];
 316
 317 static FILE *
 318 opencal(void)
 319 {
 320         uid_t uid;
 321         size_t i;
 322         int fd, found, pdes[2];
 323         struct stat sbuf;
 324
 325         /* open up calendar file as stdin */
 326         if (!freopen(calendarFile, "r", stdin)) {
 327                 if (doall) {
 328                     if (chdir(calendarHomes[0]) != 0)
 329                         return(NULL);
 330                     if (stat(calendarNoMail, &sbuf) == 0)
 331                         return(NULL);
 332                     if (!freopen(calendarFile, "r", stdin))
 333                         return(NULL);
 334                 } else {
 335                         chdir(getenv("HOME"));
 336                         for (found = i = 0; i < sizeof(calendarHomes) /
 337                             sizeof(calendarHomes[0]); i++)
 338                             if (chdir(calendarHomes[i]) == 0 &&
 339                                   freopen(calendarFile, "r", stdin)) {
 340                                     found = 1;
 341                                     break;
 342                             }
 343                         if (!found)
 344                             errx(EXIT_FAILURE, "no calendar file: ``%s''", calendarFile);
 345                 }
 346         }
 347         if (pipe(pdes) < 0)
 348                 return(NULL);
 349         switch (fork()) {
 350         case -1:                        /* error */
 351                 close(pdes[0]);
 352                 close(pdes[1]);
 353                 return(NULL);
 354         case 0:
 355                 /* child -- stdin already setup, set stdout to pipe input */
 356                 if (pdes[1] != STDOUT_FILENO) {
 357                         dup2(pdes[1], STDOUT_FILENO);
 358                         close(pdes[1]);
 359                 }
 360                 close(pdes[0]);
 361                 uid = geteuid();
 362                 if (setuid(getuid()) < 0) {
 363                         warnx("first setuid failed");
 364                         _exit(EXIT_FAILURE);
 365                 }
 366                 if (setgid(getegid()) < 0) {
 367                         warnx("setgid failed");
 368                         _exit(EXIT_FAILURE);
 369                 }
 370                 if (setuid(uid) < 0) {
 371                         warnx("setuid failed");
 372                         _exit(EXIT_FAILURE);
 373                 }
 374                 execl(_PATH_CPP, "cpp", "-P",
 375                     "-traditional", "-nostdinc",        /* GCC specific opts */
 376                     "-I.", "-I", _PATH_INCLUDE, NULL);
 377                 warn(_PATH_CPP);
 378                 _exit(EXIT_FAILURE);
 379         }
 380         /* parent -- set stdin to pipe output */
 381         dup2(pdes[0], STDIN_FILENO);
 382         close(pdes[0]);
 383         close(pdes[1]);
 384
 385         /* not reading all calendar files, just set output to stdout */
 386         if (!doall)
 387                 return(stdout);
 388
 389         /* set output to a temporary file, so if no output don't send mail */
 390         snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP);
 391         if ((fd = mkstemp(path)) < 0)
 392                 return(NULL);
 393         return(fdopen(fd, "w+"));
 394 }
 395
 396 static void
 397 closecal(FILE *fp)
 398 {
 399         uid_t uid;
 400         struct stat sbuf;
 401         int nread, pdes[2], status;
 402         char buf[1024];
 403
 404         if (!doall)
 405                 return;
 406
 407         rewind(fp);
 408         if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
 409                 goto done;
 410         if (pipe(pdes) < 0)
 411                 goto done;
 412         switch (fork()) {
 413         case -1:                        /* error */
 414                 close(pdes[0]);
 415                 close(pdes[1]);
 416                 goto done;
 417         case 0:
 418                 /* child -- set stdin to pipe output */
 419                 if (pdes[0] != STDIN_FILENO) {
 420                         dup2(pdes[0], STDIN_FILENO);
 421                         close(pdes[0]);
 422                 }
 423                 close(pdes[1]);
 424                 uid = geteuid();
 425                 if (setuid(getuid()) < 0) {
 426                         warnx("setuid failed");
 427                         _exit(EXIT_FAILURE);
 428                 }
 429                 if (setgid(getegid()) < 0) {
 430                         warnx("setgid failed");
 431                         _exit(EXIT_FAILURE);
 432                 }
 433                 if (setuid(uid) < 0) {
 434                         warnx("setuid failed");
 435                         _exit(EXIT_FAILURE);
 436                 }
 437                 execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
 438                     "\"Reminder Service\"", NULL);
 439                 warn(_PATH_SENDMAIL);
 440                 _exit(EXIT_FAILURE);
 441         }
 442         /* parent -- write to pipe input */
 443         close(pdes[0]);
 444
 445         header[1].iov_base = header[3].iov_base = pw->pw_name;
 446         header[1].iov_len = header[3].iov_len = strlen(pw->pw_name);
 447         writev(pdes[1], header, 7);
 448         while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
 449                 write(pdes[1], buf, nread);
 450         close(pdes[1]);
 451 done:   fclose(fp);
 452         unlink(path);
 453         while (wait(&status) >= 0);
 454 }