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  * $DragonFly: src/usr.bin/calendar/io.c,v 1.7 2007/09/24 20:49:09 pavalos Exp $
  37  */
  38
  39 #include <sys/types.h>
  40 #include <sys/stat.h>
  41 #include <sys/time.h>
  42 #include <sys/uio.h>
  43 #include <sys/wait.h>
  44
  45 #include <ctype.h>
  46 #include <err.h>
  47 #include <errno.h>
  48 #include <langinfo.h>
  49 #include <locale.h>
  50 #include <pwd.h>
  51 #include <stdio.h>
  52 #include <stdlib.h>
  53 #include <string.h>
  54 #include <unistd.h>
  55
  56 #include "pathnames.h"
  57 #include "calendar.h"
  58
  59 const char *calendarFile = "calendar.all";  /* default calendar file */
  60 const char *calendarHomes[] = { ".calendar", _PATH_INCLUDE }; /* HOME */
  61 const char *calendarNoMail = "nomail";  /* don't send mail if this file exist */
  62
  63 struct fixs neaster, npaskha;
  64
  65 char    hdr_from[] = "From: ";
  66 char    hdr_to[] = " (Reminder Service)\nTo: ";
  67 char    hdr_subj[] = "\nSubject: ";
  68 char    hdr_prec[] = "'s Calendar\nPrecedence: bulk\n\n";
  69
  70 struct iovec header[] = {
  71         {hdr_from, 6},
  72         {NULL, 0},
  73         {hdr_to, 24},
  74         {NULL, 0},
  75         {hdr_subj, 10},
  76         {NULL, 0},
  77         {hdr_prec, 30},
  78 };
  79
  80 static FILE     *opencal(void);
  81 static void      closecal(FILE *);
  82
  83 void
  84 cal(void)
  85 {
  86         int printing;
  87         char *p;
  88         FILE *fp;
  89         int ch, l;
  90         int month;
  91         int day;
  92         int var;
  93         static int d_first = -1;
  94         char buf[2048 + 1];
  95         struct event *events = NULL;
  96
  97         if ((fp = opencal()) == NULL)
  98                 return;
  99         for (printing = 0; fgets(buf, sizeof(buf), stdin) != NULL;) {
 100                 if ((p = strchr(buf, '\n')) != NULL)
 101                         *p = '\0';
 102                 else
 103                         while ((ch = getchar()) != '\n' && ch != EOF);
 104                 for (l = strlen(buf);
 105                      l > 0 && isspace((unsigned char)buf[l - 1]);
 106                      l--)
 107                         ;
 108                 buf[l] = '\0';
 109                 if (buf[0] == '\0')
 110                         continue;
 111                 if (strncmp(buf, "LANG=", 5) == 0) {
 112                         setlocale(LC_ALL, buf + 5);
 113                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 114                         setnnames();
 115                         continue;
 116                 }
 117                 if (strncasecmp(buf, "Easter=", 7) == 0 && buf[7]) {
 118                         if (neaster.name != NULL)
 119                                 free(neaster.name);
 120                         if ((neaster.name = strdup(buf + 7)) == NULL)
 121                                 errx(EXIT_FAILURE, "cannot allocate memory");
 122                         neaster.len = strlen(buf + 7);
 123                         continue;
 124                 }
 125                 if (strncasecmp(buf, "Paskha=", 7) == 0 && buf[7]) {
 126                         if (npaskha.name != NULL)
 127                                 free(npaskha.name);
 128                         if ((npaskha.name = strdup(buf + 7)) == NULL)
 129                                 errx(EXIT_FAILURE, "cannot allocate memory");
 130                         npaskha.len = strlen(buf + 7);
 131                         continue;
 132                 }
 133                 if (buf[0] != '\t') {
 134                         printing = isnow(buf, &month, &day, &var) ? 1 : 0;
 135                         if ((p = strchr(buf, '\t')) == NULL)
 136                                 continue;
 137                         if (p > buf && p[-1] == '*')
 138                                 var = 1;
 139                         if (printing) {
 140                                 struct tm tm;
 141                                 char dbuf[80];
 142
 143                                 if (d_first < 0)
 144                                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 145                                 tm.tm_sec = 0;  /* unused */
 146                                 tm.tm_min = 0;  /* unused */
 147                                 tm.tm_hour = 0; /* unused */
 148                                 tm.tm_wday = 0; /* unused */
 149                                 tm.tm_mon = month - 1;
 150                                 tm.tm_mday = day;
 151                                 tm.tm_year = tp->tm_year; /* unused */
 152                                 strftime(dbuf, sizeof(dbuf),
 153                                     d_first ? "%e %b" : "%b %e",
 154                                     &tm);
 155                                 events = event_add(events, month, day, dbuf, var, p);
 156                         }
 157                 }
 158                 else if (printing)
 159                         event_continue(events, buf);
 160         }
 161
 162         event_print_all(fp, events);
 163         closecal(fp);
 164 }
 165
 166 /*
 167  * Functions to handle buffered calendar events.
 168  */
 169 struct event *
 170 event_add(struct event *events, int month, int day, char *date, int var, char *txt)
 171 {
 172         struct event *e;
 173
 174         e = (struct event *)calloc(1, sizeof(struct event));
 175         if (e == NULL)
 176                 errx(EXIT_FAILURE, "event_add: cannot allocate memory");
 177         e->month = month;
 178         e->day = day;
 179         e->var = var;
 180         e->date = strdup(date);
 181         if (e->date == NULL)
 182                 errx(EXIT_FAILURE, "event_add: cannot allocate memory");
 183         e->text = strdup(txt);
 184         if (e->text == NULL)
 185                 errx(EXIT_FAILURE, "event_add: cannot allocate memory");
 186         e->next = events;
 187
 188         return e;
 189 }
 190
 191 void
 192 event_continue(struct event *e, char *txt)
 193 {
 194         char *text;
 195
 196         text = strdup(e->text);
 197         if (text == NULL)
 198                 errx(EXIT_FAILURE, "event_continue: cannot allocate memory");
 199
 200         free(e->text);
 201         e->text = (char *)malloc(strlen(text) + strlen(txt) + 3);
 202         if (e->text == NULL)
 203                 errx(EXIT_FAILURE, "event_continue: cannot allocate memory");
 204         strcpy(e->text, text);
 205         strcat(e->text, "\n");
 206         strcat(e->text, txt);
 207         free(text);
 208
 209         return;
 210 }
 211
 212 void
 213 event_print_all(FILE *fp, struct event *events)
 214 {
 215         struct event *e, *e_next;
 216         int daycount = f_dayAfter + f_dayBefore;
 217         int daycounter;
 218         int day, month;
 219
 220         for (daycounter = 0; daycounter <= daycount; daycounter++) {
 221                 day = tp->tm_yday - f_dayBefore + daycounter;
 222                 if (day < 0) day += yrdays;
 223                 if (day >= yrdays) day -= yrdays;
 224
 225                 month = 1;
 226                 while (month <= 12) {
 227                         if (day <= cumdays[month])
 228                                 break;
 229                         month++;
 230                 }
 231                 month--;
 232                 day -= cumdays[month];
 233
 234 #ifdef DEBUG
 235                 fprintf(stderr,"event_print_allmonth: %d, day: %d\n",month,day);
 236 #endif
 237
 238                 for (e = events; e != NULL; e = e_next ) {
 239                         e_next = e->next;
 240
 241                         if (month != e->month || day != e->day)
 242                                 continue;
 243
 244                         fprintf(fp, "%s%c%s\n", e->date,
 245                             e->var ? '*' : ' ', e->text);
 246                 }
 247         }
 248 }
 249
 250 int
 251 getfield(char *p, char **endp, int *flags)
 252 {
 253         int val, var;
 254         char *start, savech;
 255
 256         for (; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p)
 257                && *p != '*'; ++p);
 258         if (*p == '*') {                        /* `*' is current month */
 259                 *flags |= F_ISMONTH;
 260                 *endp = p+1;
 261                 return(tp->tm_mon + 1);
 262         }
 263         if (isdigit((unsigned char)*p)) {
 264                 val = strtol(p, &p, 10);        /* if 0, it's failure */
 265                 for (; !isdigit((unsigned char)*p)
 266                        && !isalpha((unsigned char)*p) && *p != '*'; ++p);
 267                 *endp = p;
 268                 return(val);
 269         }
 270         for (start = p; isalpha((unsigned char)*++p););
 271
 272         /* Sunday-1 */
 273         if (*p == '+' || *p == '-')
 274             for(; isdigit((unsigned char)*++p););
 275
 276         savech = *p;
 277         *p = '\0';
 278
 279         /* Month */
 280         if ((val = getmonth(start)) != 0)
 281                 *flags |= F_ISMONTH;
 282
 283         /* Day */
 284         else if ((val = getday(start)) != 0) {
 285             *flags |= F_ISDAY;
 286
 287             /* variable weekday */
 288             if ((var = getdayvar(start)) != 0) {
 289                 if (var <=5 && var >= -4)
 290                     val += var * 10;
 291 #ifdef DEBUG
 292                 printf("var: %d\n", var);
 293 #endif
 294             }
 295         }
 296
 297         /* Easter */
 298         else if ((val = geteaster(start, tp->tm_year + 1900)) != 0)
 299             *flags |= F_EASTER;
 300
 301         /* Paskha */
 302         else if ((val = getpaskha(start, tp->tm_year + 1900)) != 0)
 303             *flags |= F_EASTER;
 304
 305         /* undefined rest */
 306         else {
 307                 *p = savech;
 308                 return (0);
 309         }
 310         for (*p = savech; !isdigit((unsigned char)*p)
 311                && !isalpha((unsigned char)*p) && *p != '*'; ++p);
 312         *endp = p;
 313         return(val);
 314 }
 315
 316 static char path[MAXPATHLEN];
 317
 318 static FILE *
 319 opencal(void)
 320 {
 321         uid_t uid;
 322         size_t i;
 323         int fd, found, pdes[2];
 324         struct stat sbuf;
 325
 326         /* open up calendar file as stdin */
 327         if (!freopen(calendarFile, "r", stdin)) {
 328                 if (doall) {
 329                     if (chdir(calendarHomes[0]) != 0)
 330                         return(NULL);
 331                     if (stat(calendarNoMail, &sbuf) == 0)
 332                         return(NULL);
 333                     if (!freopen(calendarFile, "r", stdin))
 334                         return(NULL);
 335                 } else {
 336                         chdir(getenv("HOME"));
 337                         for (found = i = 0; i < sizeof(calendarHomes) /
 338                             sizeof(calendarHomes[0]); i++)
 339                             if (chdir(calendarHomes[i]) == 0 &&
 340                                   freopen(calendarFile, "r", stdin)) {
 341                                     found = 1;
 342                                     break;
 343                             }
 344                         if (!found)
 345                             errx(EXIT_FAILURE, "no calendar file: ``%s''", calendarFile);
 346                 }
 347         }
 348         if (pipe(pdes) < 0)
 349                 return(NULL);
 350         switch (fork()) {
 351         case -1:                        /* error */
 352                 close(pdes[0]);
 353                 close(pdes[1]);
 354                 return(NULL);
 355         case 0:
 356                 /* child -- stdin already setup, set stdout to pipe input */
 357                 if (pdes[1] != STDOUT_FILENO) {
 358                         dup2(pdes[1], STDOUT_FILENO);
 359                         close(pdes[1]);
 360                 }
 361                 close(pdes[0]);
 362                 uid = geteuid();
 363                 if (setuid(getuid()) < 0) {
 364                         warnx("first setuid failed");
 365                         _exit(EXIT_FAILURE);
 366                 };
 367                 if (setgid(getegid()) < 0) {
 368                         warnx("setgid failed");
 369                         _exit(EXIT_FAILURE);
 370                 }
 371                 if (setuid(uid) < 0) {
 372                         warnx("setuid failed");
 373                         _exit(EXIT_FAILURE);
 374                 }
 375                 execl(_PATH_CPP, "cpp", "-P",
 376                     "-traditional", "-nostdinc",        /* GCC specific opts */
 377                     "-I.", "-I", _PATH_INCLUDE, (char *)NULL);
 378                 warn(_PATH_CPP);
 379                 _exit(EXIT_FAILURE);
 380         }
 381         /* parent -- set stdin to pipe output */
 382         dup2(pdes[0], STDIN_FILENO);
 383         close(pdes[0]);
 384         close(pdes[1]);
 385
 386         /* not reading all calendar files, just set output to stdout */
 387         if (!doall)
 388                 return(stdout);
 389
 390         /* set output to a temporary file, so if no output don't send mail */
 391         snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP);
 392         if ((fd = mkstemp(path)) < 0)
 393                 return(NULL);
 394         return(fdopen(fd, "w+"));
 395 }
 396
 397 static void
 398 closecal(FILE *fp)
 399 {
 400         uid_t uid;
 401         struct stat sbuf;
 402         int nread, pdes[2], status;
 403         char buf[1024];
 404
 405         if (!doall)
 406                 return;
 407
 408         rewind(fp);
 409         if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
 410                 goto done;
 411         if (pipe(pdes) < 0)
 412                 goto done;
 413         switch (fork()) {
 414         case -1:                        /* error */
 415                 close(pdes[0]);
 416                 close(pdes[1]);
 417                 goto done;
 418         case 0:
 419                 /* child -- set stdin to pipe output */
 420                 if (pdes[0] != STDIN_FILENO) {
 421                         dup2(pdes[0], STDIN_FILENO);
 422                         close(pdes[0]);
 423                 }
 424                 close(pdes[1]);
 425                 uid = geteuid();
 426                 if (setuid(getuid()) < 0) {
 427                         warnx("setuid failed");
 428                         _exit(EXIT_FAILURE);
 429                 };
 430                 if (setgid(getegid()) < 0) {
 431                         warnx("setgid failed");
 432                         _exit(EXIT_FAILURE);
 433                 }
 434                 if (setuid(uid) < 0) {
 435                         warnx("setuid failed");
 436                         _exit(EXIT_FAILURE);
 437                 }
 438                 execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
 439                     "\"Reminder Service\"", (char *)NULL);
 440                 warn(_PATH_SENDMAIL);
 441                 _exit(EXIT_FAILURE);
 442         }
 443         /* parent -- write to pipe input */
 444         close(pdes[0]);
 445
 446         header[1].iov_base = header[3].iov_base = pw->pw_name;
 447         header[1].iov_len = header[3].iov_len = strlen(pw->pw_name);
 448         writev(pdes[1], header, 7);
 449         while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
 450                 write(pdes[1], buf, nread);
 451         close(pdes[1]);
 452 done:   fclose(fp);
 453         unlink(path);
 454         while (wait(&status) >= 0);
 455 }