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 1.5 2006/09/16 18:38:00 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 void
  81 cal(void)
  82 {
  83         int printing;
  84         char *p;
  85         FILE *fp;
  86         int ch, l;
  87         int month;
  88         int day;
  89         int var;
  90         static int d_first = -1;
  91         char buf[2048 + 1];
  92
  93         if ((fp = opencal()) == NULL)
  94                 return;
  95         for (printing = 0; fgets(buf, sizeof(buf), stdin) != NULL;) {
  96                 if ((p = strchr(buf, '\n')) != NULL)
  97                         *p = '\0';
  98                 else
  99                         while ((ch = getchar()) != '\n' && ch != EOF);
 100                 for (l = strlen(buf);
 101                      l > 0 && isspace((unsigned char)buf[l - 1]);
 102                      l--)
 103                         ;
 104                 buf[l] = '\0';
 105                 if (buf[0] == '\0')
 106                         continue;
 107                 if (strncmp(buf, "LANG=", 5) == 0) {
 108                         setlocale(LC_ALL, buf + 5);
 109                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 110                         setnnames();
 111                         continue;
 112                 }
 113                 if (strncasecmp(buf, "Easter=", 7) == 0 && buf[7]) {
 114                         if (neaster.name != NULL)
 115                                 free(neaster.name);
 116                         if ((neaster.name = strdup(buf + 7)) == NULL)
 117                                 errx(EXIT_FAILURE, "cannot allocate memory");
 118                         neaster.len = strlen(buf + 7);
 119                         continue;
 120                 }
 121                 if (strncasecmp(buf, "Paskha=", 7) == 0 && buf[7]) {
 122                         if (npaskha.name != NULL)
 123                                 free(npaskha.name);
 124                         if ((npaskha.name = strdup(buf + 7)) == NULL)
 125                                 errx(EXIT_FAILURE, "cannot allocate memory");
 126                         npaskha.len = strlen(buf + 7);
 127                         continue;
 128                 }
 129                 if (buf[0] != '\t') {
 130                         printing = isnow(buf, &month, &day, &var) ? 1 : 0;
 131                         if ((p = strchr(buf, '\t')) == NULL)
 132                                 continue;
 133                         if (p > buf && p[-1] == '*')
 134                                 var = 1;
 135                         if (printing) {
 136                                 struct tm tm;
 137                                 char dbuf[80];
 138
 139                                 if (d_first < 0)
 140                                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 141                                 tm.tm_sec = 0;  /* unused */
 142                                 tm.tm_min = 0;  /* unused */
 143                                 tm.tm_hour = 0; /* unused */
 144                                 tm.tm_wday = 0; /* unused */
 145                                 tm.tm_mon = month - 1;
 146                                 tm.tm_mday = day;
 147                                 tm.tm_year = tp->tm_year; /* unused */
 148                                 strftime(dbuf, sizeof(dbuf),
 149                                     d_first ? "%e %b" : "%b %e",
 150                                     &tm);
 151                                 fprintf(fp, "%s%c%s\n", dbuf,
 152                                     var ? '*' : ' ', p);
 153                         }
 154                 }
 155                 else if (printing)
 156                         fprintf(fp, "%s\n", buf);
 157         }
 158         closecal(fp);
 159 }
 160
 161 int
 162 getfield(char *p, char **endp, int *flags)
 163 {
 164         int val, var;
 165         char *start, savech;
 166
 167         for (; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p) && *p != '*'; ++p);
 168         if (*p == '*') {                        /* `*' is current month */
 169                 *flags |= F_ISMONTH;
 170                 *endp = p+1;
 171                 return(tp->tm_mon + 1);
 172         }
 173         if (isdigit((unsigned char)*p)) {
 174                 val = strtol(p, &p, 10);        /* if 0, it's failure */
 175                 for (; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p) && *p != '*'; ++p);
 176                 *endp = p;
 177                 return(val);
 178         }
 179         for (start = p; isalpha((unsigned char)*++p););
 180
 181         /* Sunday-1 */
 182         if (*p == '+' || *p == '-')
 183             for(; isdigit((unsigned char)*++p););
 184
 185         savech = *p;
 186         *p = '\0';
 187
 188         /* Month */
 189         if ((val = getmonth(start)) != 0)
 190                 *flags |= F_ISMONTH;
 191
 192         /* Day */
 193         else if ((val = getday(start)) != 0) {
 194             *flags |= F_ISDAY;
 195
 196             /* variable weekday */
 197             if ((var = getdayvar(start)) != 0) {
 198                 if (var <=5 && var >= -4)
 199                     val += var * 10;
 200 #ifdef DEBUG
 201                 printf("var: %d\n", var);
 202 #endif
 203             }
 204         }
 205
 206         /* Easter */
 207         else if ((val = geteaster(start, tp->tm_year + 1900)) != 0)
 208             *flags |= F_EASTER;
 209
 210         /* Paskha */
 211         else if ((val = getpaskha(start, tp->tm_year + 1900)) != 0)
 212             *flags |= F_EASTER;
 213
 214         /* undefined rest */
 215         else {
 216                 *p = savech;
 217                 return (0);
 218         }
 219         for (*p = savech; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p) && *p != '*'; ++p);
 220         *endp = p;
 221         return(val);
 222 }
 223
 224 static char path[MAXPATHLEN];
 225
 226 FILE *
 227 opencal(void)
 228 {
 229         uid_t uid;
 230         size_t i;
 231         int fd, found, pdes[2];
 232         struct stat sbuf;
 233
 234         /* open up calendar file as stdin */
 235         if (!freopen(calendarFile, "r", stdin)) {
 236                 if (doall) {
 237                     if (chdir(calendarHomes[0]) != 0)
 238                         return(NULL);
 239                     if (stat(calendarNoMail, &sbuf) == 0)
 240                         return(NULL);
 241                     if (!freopen(calendarFile, "r", stdin))
 242                         return(NULL);
 243                 } else {
 244                         chdir(getenv("HOME"));
 245                         for (found = i = 0; i < sizeof(calendarHomes) /
 246                             sizeof(calendarHomes[0]); i++)
 247                             if (chdir(calendarHomes[i]) == 0 &&
 248                                   freopen(calendarFile, "r", stdin)) {
 249                                     found = 1;
 250                                     break;
 251                             }
 252                         if (!found)
 253                             errx(EXIT_FAILURE, "no calendar file: ``%s''", calendarFile);
 254                 }
 255         }
 256         if (pipe(pdes) < 0)
 257                 return(NULL);
 258         switch (fork()) {
 259         case -1:                        /* error */
 260                 close(pdes[0]);
 261                 close(pdes[1]);
 262                 return(NULL);
 263         case 0:
 264                 /* child -- stdin already setup, set stdout to pipe input */
 265                 if (pdes[1] != STDOUT_FILENO) {
 266                         dup2(pdes[1], STDOUT_FILENO);
 267                         close(pdes[1]);
 268                 }
 269                 close(pdes[0]);
 270                 uid = geteuid();
 271                 if (setuid(getuid()) < 0) {
 272                         warnx("first setuid failed");
 273                         _exit(EXIT_FAILURE);
 274                 };
 275                 if (setgid(getegid()) < 0) {
 276                         warnx("setgid failed");
 277                         _exit(EXIT_FAILURE);
 278                 }
 279                 if (setuid(uid) < 0) {
 280                         warnx("setuid failed");
 281                         _exit(EXIT_FAILURE);
 282                 }
 283                 execl(_PATH_CPP, "cpp", "-P",
 284                     "-traditional", "-nostdinc",        /* GCC specific opts */
 285                     "-I.", "-I", _PATH_INCLUDE, (char *)NULL);
 286                 warn(_PATH_CPP);
 287                 _exit(EXIT_FAILURE);
 288         }
 289         /* parent -- set stdin to pipe output */
 290         dup2(pdes[0], STDIN_FILENO);
 291         close(pdes[0]);
 292         close(pdes[1]);
 293
 294         /* not reading all calendar files, just set output to stdout */
 295         if (!doall)
 296                 return(stdout);
 297
 298         /* set output to a temporary file, so if no output don't send mail */
 299         snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP);
 300         if ((fd = mkstemp(path)) < 0)
 301                 return(NULL);
 302         return(fdopen(fd, "w+"));
 303 }
 304
 305 void
 306 closecal(FILE *fp)
 307 {
 308         uid_t uid;
 309         struct stat sbuf;
 310         int nread, pdes[2], status;
 311         char buf[1024];
 312
 313         if (!doall)
 314                 return;
 315
 316         rewind(fp);
 317         if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
 318                 goto done;
 319         if (pipe(pdes) < 0)
 320                 goto done;
 321         switch (fork()) {
 322         case -1:                        /* error */
 323                 close(pdes[0]);
 324                 close(pdes[1]);
 325                 goto done;
 326         case 0:
 327                 /* child -- set stdin to pipe output */
 328                 if (pdes[0] != STDIN_FILENO) {
 329                         dup2(pdes[0], STDIN_FILENO);
 330                         close(pdes[0]);
 331                 }
 332                 close(pdes[1]);
 333                 uid = geteuid();
 334                 if (setuid(getuid()) < 0) {
 335                         warnx("setuid failed");
 336                         _exit(EXIT_FAILURE);
 337                 };
 338                 if (setgid(getegid()) < 0) {
 339                         warnx("setgid failed");
 340                         _exit(EXIT_FAILURE);
 341                 }
 342                 if (setuid(uid) < 0) {
 343                         warnx("setuid failed");
 344                         _exit(EXIT_FAILURE);
 345                 }
 346                 execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
 347                     "\"Reminder Service\"", (char *)NULL);
 348                 warn(_PATH_SENDMAIL);
 349                 _exit(EXIT_FAILURE);
 350         }
 351         /* parent -- write to pipe input */
 352         close(pdes[0]);
 353
 354         header[1].iov_base = header[3].iov_base = pw->pw_name;
 355         header[1].iov_len = header[3].iov_len = strlen(pw->pw_name);
 356         writev(pdes[1], header, 7);
 357         while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
 358                 write(pdes[1], buf, nread);
 359         close(pdes[1]);
 360 done:   fclose(fp);
 361         unlink(path);
 362         while (wait(&status) >= 0);
 363 }