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