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