misc_cmds/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
  34 #ifndef lint
  35 static const char copyright[] =
  36 "@(#) Copyright (c) 1989, 1993\n\
  37         The Regents of the University of California.  All rights reserved.\n";
  38 #endif
  39
  40 #if 0
  41 #ifndef lint
  42 static char sccsid[] = "@(#)calendar.c  8.3 (Berkeley) 3/25/94";
  43 #endif
  44 #endif
  45
  46 #include <sys/cdefs.h>
  47 __FBSDID("$FreeBSD: src/usr.bin/calendar/io.c,v 1.24 2007/12/30 22:04:04 grog Exp $");
  48
  49 #include <sys/types.h>
  50 #include <sys/param.h>
  51 #include <sys/stat.h>
  52 #include <sys/time.h>
  53 #include <sys/uio.h>
  54 #include <sys/wait.h>
  55 #include <ctype.h>
  56 #include <err.h>
  57 #include <errno.h>
  58 #include <langinfo.h>
  59 #include <locale.h>
  60 #include <pwd.h>
  61 #include <stdio.h>
  62 #include <stdlib.h>
  63 #include <string.h>
  64 #include <unistd.h>
  65
  66 #include <libiosexec.h>
  67
  68 #include "pathnames.h"
  69 #include "calendar.h"
  70
  71
  72 const char *calendarFile = "calendar";  /* default calendar file */
  73 const char *calendarHomes[] = { ".calendar", _PATH_INCLUDE }; /* HOME */
  74 const char *calendarNoMail = "nomail";  /* don't sent mail if this file exist */
  75
  76 struct fixs neaster, npaskha;
  77
  78 struct iovec header[] = {
  79         {"From: ", 6},
  80         {NULL, 0},
  81         {" (Reminder Service)\nTo: ", 24},
  82         {NULL, 0},
  83         {"\nSubject: ", 10},
  84         {NULL, 0},
  85         {"'s Calendar\nPrecedence: bulk\n\n",  30},
  86 };
  87
  88
  89 void
  90 cal(void)
  91 {
  92         int printing;
  93         char *p;
  94         FILE *fp;
  95         int ch, l;
  96         int month;
  97         int day;
  98         int var;
  99         static int d_first = -1;
 100         char buf[2048 + 1];
 101         struct event *events = NULL;
 102
 103         if ((fp = opencal()) == NULL)
 104                 return;
 105         for (printing = 0; fgets(buf, sizeof(buf), stdin) != NULL;) {
 106                 if ((p = strchr(buf, '\n')) != NULL)
 107                         *p = '\0';
 108                 else
 109                         while ((ch = getchar()) != '\n' && ch != EOF);
 110                 for (l = strlen(buf);
 111                      l > 0 && isspace((unsigned char)buf[l - 1]);
 112                      l--)
 113                         ;
 114                 buf[l] = '\0';
 115                 if (buf[0] == '\0')
 116                         continue;
 117                 if (strncmp(buf, "LANG=", 5) == 0) {
 118                         (void) setlocale(LC_ALL, buf + 5);
 119                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 120                         setnnames();
 121                         continue;
 122                 }
 123                 if (strncasecmp(buf, "Easter=", 7) == 0 && buf[7]) {
 124                         if (neaster.name != NULL)
 125                                 free(neaster.name);
 126                         if ((neaster.name = strdup(buf + 7)) == NULL)
 127                                 errx(1, "cannot allocate memory");
 128                         neaster.len = strlen(buf + 7);
 129                         continue;
 130                 }
 131                 if (strncasecmp(buf, "Paskha=", 7) == 0 && buf[7]) {
 132                         if (npaskha.name != NULL)
 133                                 free(npaskha.name);
 134                         if ((npaskha.name = strdup(buf + 7)) == NULL)
 135                                 errx(1, "cannot allocate memory");
 136                         npaskha.len = strlen(buf + 7);
 137                         continue;
 138                 }
 139                 if (buf[0] != '\t') {
 140                         printing = isnow(buf, &month, &day, &var) ? 1 : 0;
 141                         if ((p = strchr(buf, '\t')) == NULL) {
 142 #if DEBUG
 143                                 fprintf(stderr, "[continue <%s>]\n", buf);
 144 #endif
 145                                 continue;
 146                         }
 147                         if (p > buf && p[-1] == '*')
 148                                 var = 1;
 149                         if (printing) {
 150 #if DEBUG
 151                                 fprintf(stderr, "[Add event]\n");
 152 #endif
 153                                 struct tm tm;
 154                                 char dbuf[80];
 155
 156                                 if (d_first < 0)
 157                                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 158                                 tm.tm_sec = 0;  /* unused */
 159                                 tm.tm_min = 0;  /* unused */
 160                                 tm.tm_hour = 0; /* unused */
 161                                 tm.tm_wday = 0; /* unused */
 162                                 tm.tm_mon = month - 1;
 163                                 tm.tm_mday = day;
 164                                 tm.tm_year = tp->tm_year; /* unused */
 165                                 (void)strftime(dbuf, sizeof(dbuf),
 166                                                d_first ? "%e %b" : "%b %e",
 167                                                &tm);
 168                                 events = event_add(events, month, day, dbuf, var, p);
 169                         }
 170                 }
 171                 else if (printing)
 172                         event_continue(events, buf);
 173         }
 174
 175         event_print_all(fp, events);
 176         closecal(fp);
 177 }
 178
 179 /*
 180  * Functions to handle buffered calendar events.
 181  */
 182 struct event *
 183 event_add(struct event *events, int month, int day, char *date, int var, char *txt)
 184 {
 185         struct event *e;
 186
 187         e = (struct event *)calloc(1, sizeof(struct event));
 188         if (e == NULL)
 189                 errx(1, "event_add: cannot allocate memory");
 190         e->month = month;
 191         e->day = day;
 192         e->var = var;
 193         e->date = strdup(date);
 194         if (e->date == NULL)
 195                 errx(1, "event_add: cannot allocate memory");
 196         e->text = strdup(txt);
 197         if (e->text == NULL)
 198                 errx(1, "event_add: cannot allocate memory");
 199         e->next = events;
 200
 201         return e;
 202 }
 203
 204 void
 205 event_continue(struct event *e, char *txt)
 206 {
 207         char *text;
 208
 209         text = strdup(e->text);
 210         if (text == NULL)
 211                 errx(1, "event_continue: cannot allocate memory");
 212
 213         free(e->text);
 214         e->text = (char *)malloc(strlen(text) + strlen(txt) + 3);
 215         if (e->text == NULL)
 216                 errx(1, "event_continue: cannot allocate memory");
 217         strcpy(e->text, text);
 218         strcat(e->text, "\n");
 219         strcat(e->text, txt);
 220         free(text);
 221
 222         return;
 223 }
 224
 225 void
 226 event_print_all(FILE *fp, struct event *events)
 227 {
 228         struct event *e, *e_next;
 229         int daycount = f_dayAfter + f_dayBefore;
 230         int daycounter;
 231         int day, month;
 232
 233         for (daycounter = 0; daycounter <= daycount; daycounter++) {
 234                 day = tp->tm_yday - f_dayBefore + daycounter;
 235                 if (day < 0) day += yrdays;
 236                 if (day >= yrdays) day -= yrdays;
 237
 238                 month = 1;
 239                 while (month <= 12) {
 240                         if (day <= cumdays[month])
 241                                 break;
 242                         month++;
 243                 }
 244                 month--;
 245                 day -= cumdays[month];
 246
 247 #ifdef DEBUG
 248                 fprintf(stderr,"event_print_allmonth: %d, day: %d\n",month,day);
 249 #endif
 250
 251                 for (e = events; e != NULL; e = e_next ) {
 252                         e_next = e->next;
 253
 254                         if (month != e->month || day != e->day)
 255                                 continue;
 256
 257                         (void)fprintf(fp, "%s%c%s\n", e->date,
 258                             e->var ? '*' : ' ', e->text);
 259                 }
 260         }
 261 }
 262
 263 int
 264 getfield(char *p, char **endp, int *flags)
 265 {
 266         int val, var;
 267         char *start, savech;
 268
 269         for (; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p)
 270                && *p != '*'; ++p);
 271         if (*p == '*') {                        /* `*' is current month */
 272                 *flags |= F_ISMONTH;
 273                 *endp = p+1;
 274                 return (tp->tm_mon + 1);
 275         }
 276         if (isdigit((unsigned char)*p)) {
 277                 val = strtol(p, &p, 10);        /* if 0, it's failure */
 278                 for (; !isdigit((unsigned char)*p)
 279                        && !isalpha((unsigned char)*p) && *p != '*'; ++p);
 280                 *endp = p;
 281                 return (val);
 282         }
 283         for (start = p; isalpha((unsigned char)*++p););
 284
 285         /* Sunday-1 */
 286         if (*p == '+' || *p == '-')
 287             for(; isdigit((unsigned char)*++p););
 288
 289         savech = *p;
 290         *p = '\0';
 291
 292         /* Month */
 293         if ((val = getmonth(start)) != 0)
 294                 *flags |= F_ISMONTH;
 295
 296         /* Day */
 297         else if ((val = getday(start)) != 0) {
 298             *flags |= F_ISDAY;
 299
 300             /* variable weekday */
 301             if ((var = getdayvar(start)) != 0) {
 302                 if (var <=5 && var >= -4)
 303                     val += var * 10;
 304 #ifdef DEBUG
 305                 printf("var: %d\n", var);
 306 #endif
 307             }
 308         }
 309
 310         /* Easter */
 311         else if ((val = geteaster(start, tp->tm_year + 1900)) != 0)
 312             *flags |= F_EASTER;
 313
 314         /* Paskha */
 315         else if ((val = getpaskha(start, tp->tm_year + 1900)) != 0)
 316             *flags |= F_EASTER;
 317
 318         /* undefined rest */
 319         else {
 320                 *p = savech;
 321                 return (0);
 322         }
 323         for (*p = savech; !isdigit((unsigned char)*p)
 324                && !isalpha((unsigned char)*p) && *p != '*'; ++p);
 325         *endp = p;
 326         return (val);
 327 }
 328
 329 char path[MAXPATHLEN];
 330
 331 FILE *
 332 opencal(void)
 333 {
 334         uid_t uid;
 335         size_t i;
 336         int fd, found, pdes[2];
 337         struct stat sbuf;
 338
 339         /* open up calendar file as stdin */
 340         if (!freopen(calendarFile, "r", stdin)) {
 341                 if (doall) {
 342                     if (chdir(calendarHomes[0]) != 0)
 343                         return (NULL);
 344                     if (stat(calendarNoMail, &sbuf) == 0)
 345                         return (NULL);
 346                     if (!freopen(calendarFile, "r", stdin))
 347                         return (NULL);
 348                 } else {
 349                         char *home = getenv("HOME");
 350                         if (home == NULL || *home == '\0')
 351                                 errx(1, "cannot get home directory");
 352                         chdir(home);
 353                         for (found = i = 0; i < sizeof(calendarHomes) /
 354                             sizeof(calendarHomes[0]); i++)
 355                             if (chdir(calendarHomes[i]) == 0 &&
 356                                   freopen(calendarFile, "r", stdin)) {
 357                                     found = 1;
 358                                     break;
 359                             }
 360                         if (!found)
 361                             errx(1, "can't open calendar file \"%s\": %s (%d)",
 362                                  calendarFile, strerror(errno), errno);
 363                 }
 364         }
 365         if (pipe(pdes) < 0)
 366                 return (NULL);
 367         switch (fork()) {
 368         case -1:                        /* error */
 369                 (void)close(pdes[0]);
 370                 (void)close(pdes[1]);
 371                 return (NULL);
 372         case 0:
 373                 /* child -- stdin already setup, set stdout to pipe input */
 374                 if (pdes[1] != STDOUT_FILENO) {
 375                         (void)dup2(pdes[1], STDOUT_FILENO);
 376                         (void)close(pdes[1]);
 377                 }
 378                 (void)close(pdes[0]);
 379                 uid = geteuid();
 380                 if (setuid(getuid()) < 0) {
 381                         warnx("first setuid failed");
 382                         _exit(1);
 383                 };
 384                 if (setgid(getegid()) < 0) {
 385                         warnx("setgid failed");
 386                         _exit(1);
 387                 }
 388                 if (setuid(uid) < 0) {
 389                         warnx("setuid failed");
 390                         _exit(1);
 391                 }
 392                 execl(_PATH_CPP, "cpp", "-w", "-P",
 393                     "-traditional", "-nostdinc",        /* GCC specific opts */
 394                     "-I.", "-I" _PATH_INCLUDE, (char *)NULL);
 395                 warn(_PATH_CPP);
 396                 _exit(1);
 397         }
 398         /* parent -- set stdin to pipe output */
 399         (void)dup2(pdes[0], STDIN_FILENO);
 400         (void)close(pdes[0]);
 401         (void)close(pdes[1]);
 402
 403         /* not reading all calendar files, just set output to stdout */
 404         if (!doall)
 405                 return (stdout);
 406
 407         /* set output to a temporary file, so if no output don't send mail */
 408         (void)snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP);
 409         if ((fd = mkstemp(path)) < 0)
 410                 return (NULL);
 411         return (fdopen(fd, "w+"));
 412 }
 413
 414 void
 415 closecal(FILE *fp)
 416 {
 417         uid_t uid;
 418         struct stat sbuf;
 419         int nread, pdes[2], status;
 420         char buf[1024];
 421
 422         if (!doall)
 423                 return;
 424
 425         (void)rewind(fp);
 426         if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
 427                 goto done;
 428         if (pipe(pdes) < 0)
 429                 goto done;
 430         switch (fork()) {
 431         case -1:                        /* error */
 432                 (void)close(pdes[0]);
 433                 (void)close(pdes[1]);
 434                 goto done;
 435         case 0:
 436                 /* child -- set stdin to pipe output */
 437                 if (pdes[0] != STDIN_FILENO) {
 438                         (void)dup2(pdes[0], STDIN_FILENO);
 439                         (void)close(pdes[0]);
 440                 }
 441                 (void)close(pdes[1]);
 442                 uid = geteuid();
 443                 if (setuid(getuid()) < 0) {
 444                         warnx("setuid failed");
 445                         _exit(1);
 446                 };
 447                 if (setgid(getegid()) < 0) {
 448                         warnx("setgid failed");
 449                         _exit(1);
 450                 }
 451                 if (setuid(uid) < 0) {
 452                         warnx("setuid failed");
 453                         _exit(1);
 454                 }
 455                 execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
 456                     "\"Reminder Service\"", (char *)NULL);
 457                 warn(_PATH_SENDMAIL);
 458                 _exit(1);
 459         }
 460         /* parent -- write to pipe input */
 461         (void)close(pdes[0]);
 462
 463         header[1].iov_base = header[3].iov_base = pw->pw_name;
 464         header[1].iov_len = header[3].iov_len = strlen(pw->pw_name);
 465         writev(pdes[1], header, 7);
 466         while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
 467                 (void)write(pdes[1], buf, nread);
 468         (void)close(pdes[1]);
 469 done:   (void)fclose(fp);
 470         (void)unlink(path);
 471         while (wait(&status) >= 0);
 472 }