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 1.13.2.3 2002/08/26 00:32:46 jmallett Exp $
  36  * $DragonFly: src/usr.bin/calendar/io.c,v 1.4 2004/01/06 15:29:09 eirikn Exp $
  37  */
  38
  39 #include <sys/types.h>
  40 #include <sys/param.h>
  41 #include <sys/stat.h>
  42 #include <sys/time.h>
  43 #include <sys/uio.h>
  44 #include <sys/wait.h>
  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
  60 const char *calendarFile = "calendar.all";  /* default calendar file */
  61 const char *calendarHomes[] = { ".calendar", _PATH_INCLUDE }; /* HOME */
  62 const char *calendarNoMail = "nomail";  /* don't sent mail if this file exist */
  63
  64 struct fixs neaster, npaskha;
  65
  66 struct iovec header[] = {
  67         {"From: ", 6},
  68         {NULL, 0},
  69         {" (Reminder Service)\nTo: ", 24},
  70         {NULL, 0},
  71         {"\nSubject: ", 10},
  72         {NULL, 0},
  73         {"'s Calendar\nPrecedence: bulk\n\n",  30},
  74 };
  75
  76
  77 void
  78 cal(void)
  79 {
  80         int printing;
  81         char *p;
  82         FILE *fp;
  83         int ch, l;
  84         int month;
  85         int day;
  86         int var;
  87         static int d_first = -1;
  88         char buf[2048 + 1];
  89
  90         if ((fp = opencal()) == NULL)
  91                 return;
  92         for (printing = 0; fgets(buf, sizeof(buf), stdin) != NULL;) {
  93                 if ((p = strchr(buf, '\n')) != NULL)
  94                         *p = '\0';
  95                 else
  96                         while ((ch = getchar()) != '\n' && ch != EOF);
  97                 for (l = strlen(buf);
  98                      l > 0 && isspace((unsigned char)buf[l - 1]);
  99                      l--)
 100                         ;
 101                 buf[l] = '\0';
 102                 if (buf[0] == '\0')
 103                         continue;
 104                 if (strncmp(buf, "LANG=", 5) == 0) {
 105                         (void) setlocale(LC_ALL, buf + 5);
 106                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 107                         setnnames();
 108                         continue;
 109                 }
 110                 if (strncasecmp(buf, "Easter=", 7) == 0 && buf[7]) {
 111                         if (neaster.name != NULL)
 112                                 free(neaster.name);
 113                         if ((neaster.name = strdup(buf + 7)) == NULL)
 114                                 errx(1, "cannot allocate memory");
 115                         neaster.len = strlen(buf + 7);
 116                         continue;
 117                 }
 118                 if (strncasecmp(buf, "Paskha=", 7) == 0 && buf[7]) {
 119                         if (npaskha.name != NULL)
 120                                 free(npaskha.name);
 121                         if ((npaskha.name = strdup(buf + 7)) == NULL)
 122                                 errx(1, "cannot allocate memory");
 123                         npaskha.len = strlen(buf + 7);
 124                         continue;
 125                 }
 126                 if (buf[0] != '\t') {
 127                         printing = isnow(buf, &month, &day, &var) ? 1 : 0;
 128                         if ((p = strchr(buf, '\t')) == NULL)
 129                                 continue;
 130                         if (p > buf && p[-1] == '*')
 131                                 var = 1;
 132                         if (printing) {
 133                                 struct tm tm;
 134                                 char dbuf[80];
 135
 136                                 if (d_first < 0)
 137                                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 138                                 tm.tm_sec = 0;  /* unused */
 139                                 tm.tm_min = 0;  /* unused */
 140                                 tm.tm_hour = 0; /* unused */
 141                                 tm.tm_wday = 0; /* unused */
 142                                 tm.tm_mon = month - 1;
 143                                 tm.tm_mday = day;
 144                                 tm.tm_year = tp->tm_year; /* unused */
 145                                 (void)strftime(dbuf, sizeof(dbuf),
 146                                                d_first ? "%e %b" : "%b %e",
 147                                                &tm);
 148                                 (void)fprintf(fp, "%s%c%s\n", dbuf,
 149                                     var ? '*' : ' ', p);
 150                         }
 151                 }
 152                 else if (printing)
 153                         fprintf(fp, "%s\n", buf);
 154         }
 155         closecal(fp);
 156 }
 157
 158 int
 159 getfield(char *p, char **endp, int *flags)
 160 {
 161         int val, var;
 162         char *start, savech;
 163
 164         for (; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p) && *p != '*'; ++p);
 165         if (*p == '*') {                        /* `*' is current month */
 166                 *flags |= F_ISMONTH;
 167                 *endp = p+1;
 168                 return (tp->tm_mon + 1);
 169         }
 170         if (isdigit((unsigned char)*p)) {
 171                 val = strtol(p, &p, 10);        /* if 0, it's failure */
 172                 for (; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p) && *p != '*'; ++p);
 173                 *endp = p;
 174                 return (val);
 175         }
 176         for (start = p; isalpha((unsigned char)*++p););
 177
 178         /* Sunday-1 */
 179         if (*p == '+' || *p == '-')
 180             for(; isdigit((unsigned char)*++p););
 181
 182         savech = *p;
 183         *p = '\0';
 184
 185         /* Month */
 186         if ((val = getmonth(start)) != 0)
 187                 *flags |= F_ISMONTH;
 188
 189         /* Day */
 190         else if ((val = getday(start)) != 0) {
 191             *flags |= F_ISDAY;
 192
 193             /* variable weekday */
 194             if ((var = getdayvar(start)) != 0) {
 195                 if (var <=5 && var >= -4)
 196                     val += var * 10;
 197 #ifdef DEBUG
 198                 printf("var: %d\n", var);
 199 #endif
 200             }
 201         }
 202
 203         /* Easter */
 204         else if ((val = geteaster(start, tp->tm_year + 1900)) != 0)
 205             *flags |= F_EASTER;
 206
 207         /* Paskha */
 208         else if ((val = getpaskha(start, tp->tm_year + 1900)) != 0)
 209             *flags |= F_EASTER;
 210
 211         /* undefined rest */
 212         else {
 213                 *p = savech;
 214                 return (0);
 215         }
 216         for (*p = savech; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p) && *p != '*'; ++p);
 217         *endp = p;
 218         return (val);
 219 }
 220
 221 char path[MAXPATHLEN];
 222
 223 FILE *
 224 opencal(void)
 225 {
 226         uid_t uid;
 227         size_t i;
 228         int fd, found, pdes[2];
 229         struct stat sbuf;
 230
 231         /* open up calendar file as stdin */
 232         if (!freopen(calendarFile, "r", stdin)) {
 233                 if (doall) {
 234                     if (chdir(calendarHomes[0]) != 0)
 235                         return (NULL);
 236                     if (stat(calendarNoMail, &sbuf) == 0)
 237                         return (NULL);
 238                     if (!freopen(calendarFile, "r", stdin))
 239                         return (NULL);
 240                 } else {
 241                         chdir(getenv("HOME"));
 242                         for (found = i = 0; i < sizeof(calendarHomes) /
 243                             sizeof(calendarHomes[0]); i++)
 244                             if (chdir(calendarHomes[i]) == 0 &&
 245                                   freopen(calendarFile, "r", stdin)) {
 246                                     found = 1;
 247                                     break;
 248                             }
 249                         if (!found)
 250                             errx(1, "no calendar file: ``%s''", calendarFile);
 251                 }
 252         }
 253         if (pipe(pdes) < 0)
 254                 return (NULL);
 255         switch (fork()) {
 256         case -1:                        /* error */
 257                 (void)close(pdes[0]);
 258                 (void)close(pdes[1]);
 259                 return (NULL);
 260         case 0:
 261                 /* child -- stdin already setup, set stdout to pipe input */
 262                 if (pdes[1] != STDOUT_FILENO) {
 263                         (void)dup2(pdes[1], STDOUT_FILENO);
 264                         (void)close(pdes[1]);
 265                 }
 266                 (void)close(pdes[0]);
 267                 uid = geteuid();
 268                 if (setuid(getuid()) < 0) {
 269                         warnx("first setuid failed");
 270                         _exit(1);
 271                 };
 272                 if (setgid(getegid()) < 0) {
 273                         warnx("setgid failed");
 274                         _exit(1);
 275                 }
 276                 if (setuid(uid) < 0) {
 277                         warnx("setuid failed");
 278                         _exit(1);
 279                 }
 280                 execl(_PATH_CPP, "cpp", "-P",
 281                     "-traditional", "-nostdinc",        /* GCC specific opts */
 282                     "-I.", "-I", _PATH_INCLUDE, (char *)NULL);
 283                 warn(_PATH_CPP);
 284                 _exit(1);
 285         }
 286         /* parent -- set stdin to pipe output */
 287         (void)dup2(pdes[0], STDIN_FILENO);
 288         (void)close(pdes[0]);
 289         (void)close(pdes[1]);
 290
 291         /* not reading all calendar files, just set output to stdout */
 292         if (!doall)
 293                 return (stdout);
 294
 295         /* set output to a temporary file, so if no output don't send mail */
 296         (void)snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP);
 297         if ((fd = mkstemp(path)) < 0)
 298                 return (NULL);
 299         return (fdopen(fd, "w+"));
 300 }
 301
 302 void
 303 closecal(FILE *fp)
 304 {
 305         uid_t uid;
 306         struct stat sbuf;
 307         int nread, pdes[2], status;
 308         char buf[1024];
 309
 310         if (!doall)
 311                 return;
 312
 313         (void)rewind(fp);
 314         if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
 315                 goto done;
 316         if (pipe(pdes) < 0)
 317                 goto done;
 318         switch (fork()) {
 319         case -1:                        /* error */
 320                 (void)close(pdes[0]);
 321                 (void)close(pdes[1]);
 322                 goto done;
 323         case 0:
 324                 /* child -- set stdin to pipe output */
 325                 if (pdes[0] != STDIN_FILENO) {
 326                         (void)dup2(pdes[0], STDIN_FILENO);
 327                         (void)close(pdes[0]);
 328                 }
 329                 (void)close(pdes[1]);
 330                 uid = geteuid();
 331                 if (setuid(getuid()) < 0) {
 332                         warnx("setuid failed");
 333                         _exit(1);
 334                 };
 335                 if (setgid(getegid()) < 0) {
 336                         warnx("setgid failed");
 337                         _exit(1);
 338                 }
 339                 if (setuid(uid) < 0) {
 340                         warnx("setuid failed");
 341                         _exit(1);
 342                 }
 343                 execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
 344                     "\"Reminder Service\"", (char *)NULL);
 345                 warn(_PATH_SENDMAIL);
 346                 _exit(1);
 347         }
 348         /* parent -- write to pipe input */
 349         (void)close(pdes[0]);
 350
 351         header[1].iov_base = header[3].iov_base = pw->pw_name;
 352         header[1].iov_len = header[3].iov_len = strlen(pw->pw_name);
 353         writev(pdes[1], header, 7);
 354         while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
 355                 (void)write(pdes[1], buf, nread);
 356         (void)close(pdes[1]);
 357 done:   (void)fclose(fp);
 358         (void)unlink(path);
 359         while (wait(&status) >= 0);
 360 }