| 1 | /* |
| 2 | ** Copyright 2002-2006 Double Precision, Inc. See COPYING for |
| 3 | ** distribution information. |
| 4 | */ |
| 5 | |
| 6 | #include "config.h" |
| 7 | #include "liblock.h" |
| 8 | #include "mail.h" |
| 9 | #include <stdio.h> |
| 10 | #include <stdlib.h> |
| 11 | #include <string.h> |
| 12 | #include <unistd.h> |
| 13 | #include <errno.h> |
| 14 | #include <signal.h> |
| 15 | #include <sys/types.h> |
| 16 | #include <sys/stat.h> |
| 17 | #if HAVE_SYS_WAIT_H |
| 18 | #include <sys/wait.h> |
| 19 | #endif |
| 20 | #ifdef HAVE_FCNTL_H |
| 21 | #include <fcntl.h> |
| 22 | #endif |
| 23 | #ifndef WEXITSTATUS |
| 24 | #define WEXITSTATUS(stat_val) ((unsigned)(stat_val) >> 8) |
| 25 | #endif |
| 26 | #ifndef WIFEXITED |
| 27 | #define WIFEXITED(stat_val) (((stat_val) & 255) == 0) |
| 28 | #endif |
| 29 | |
| 30 | #if HAVE_SYSEXITS_H |
| 31 | #include <sysexits.h> |
| 32 | #endif |
| 33 | |
| 34 | #ifndef EX_TEMPFAIL |
| 35 | #define EX_TEMPFAIL 75 |
| 36 | #endif |
| 37 | |
| 38 | static const char rcsid[]="$Id: lockmail.c,v 1.6 2006/09/20 01:41:27 mrsam Exp $"; |
| 39 | |
| 40 | #define NTRIES_DEFAULT 60 |
| 41 | #define DELAY 5 |
| 42 | |
| 43 | static int sig=0; |
| 44 | |
| 45 | static int catch(int signum) |
| 46 | { |
| 47 | sig=1; |
| 48 | signal(SIGHUP, (RETSIGTYPE (*)(int))catch); |
| 49 | signal(SIGTERM, (RETSIGTYPE (*)(int))catch); |
| 50 | signal(SIGINT, (RETSIGTYPE (*)(int))catch); |
| 51 | return 0; |
| 52 | } |
| 53 | |
| 54 | static int caught() |
| 55 | { |
| 56 | signal(SIGHUP, SIG_DFL); |
| 57 | signal(SIGTERM, SIG_DFL); |
| 58 | signal(SIGINT, SIG_DFL); |
| 59 | return sig; |
| 60 | } |
| 61 | |
| 62 | int main(int argc, char **argv) |
| 63 | { |
| 64 | char **argvec; |
| 65 | int n; |
| 66 | int fd; |
| 67 | pid_t pid, pid2; |
| 68 | int waitstat; |
| 69 | struct ll_mail *p; |
| 70 | int ntries=NTRIES_DEFAULT; |
| 71 | int readonly=0; |
| 72 | int optchar; |
| 73 | |
| 74 | while ((optchar=getopt(argc, argv, "+rt:")) != -1) |
| 75 | switch (optchar) { |
| 76 | case 'r': |
| 77 | readonly=1; |
| 78 | break; |
| 79 | case 't': |
| 80 | ntries=atoi(optarg); |
| 81 | if (ntries < 0) |
| 82 | { |
| 83 | fprintf(stderr, "%s: invalid argument to -t\n", |
| 84 | argv[0]); |
| 85 | exit(EX_TEMPFAIL); |
| 86 | } |
| 87 | ntries= (ntries / DELAY) + 1; |
| 88 | break; |
| 89 | default: |
| 90 | exit(1); |
| 91 | } |
| 92 | |
| 93 | if (argc - optind < 2) |
| 94 | { |
| 95 | fprintf(stderr, "Usage: %s [-r] [-t time] mailfile program [args]...\n", |
| 96 | argv[0]); |
| 97 | exit(1); |
| 98 | } |
| 99 | |
| 100 | if ((argvec=malloc(sizeof(char *) * (argc - optind + 1))) == NULL) |
| 101 | { |
| 102 | perror("malloc"); |
| 103 | exit (1); |
| 104 | } |
| 105 | |
| 106 | for (n=optind+1; n<argc; n++) |
| 107 | argvec[n-optind - 1]=argv[n]; |
| 108 | |
| 109 | argvec[n-optind-1]=NULL; |
| 110 | |
| 111 | /* Create the mail file, if it doesn't exist */ |
| 112 | |
| 113 | if ((n=open(argv[optind], O_RDWR|O_CREAT, 0600)) >= 0) |
| 114 | close(n); |
| 115 | |
| 116 | signal(SIGUSR2, SIG_IGN); |
| 117 | signal(SIGCHLD, SIG_DFL); |
| 118 | |
| 119 | p=NULL; |
| 120 | |
| 121 | for (n=0; n<ntries; sleep(DELAY), n++) |
| 122 | { |
| 123 | if (p) |
| 124 | ll_mail_free(p); |
| 125 | |
| 126 | if ((p=ll_mail_alloc(argv[optind])) == NULL) |
| 127 | { |
| 128 | perror("malloc"); |
| 129 | exit(1); |
| 130 | } |
| 131 | |
| 132 | signal(SIGHUP, (RETSIGTYPE (*)(int))catch); |
| 133 | signal(SIGTERM, (RETSIGTYPE (*)(int))catch); |
| 134 | signal(SIGINT, (RETSIGTYPE (*)(int))catch); |
| 135 | |
| 136 | if (ll_mail_lock(p) < 0) |
| 137 | { |
| 138 | if (errno == ENOENT) |
| 139 | break; /* Mail file gone? */ |
| 140 | if (caught()) |
| 141 | break; |
| 142 | continue; |
| 143 | } |
| 144 | |
| 145 | if ((fd=ll_mail_open(p)) < 0) |
| 146 | { |
| 147 | if (!readonly || (fd=ll_mail_open_ro(p)) < 0) |
| 148 | { |
| 149 | if (caught()) |
| 150 | break; |
| 151 | continue; |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | if ((pid=fork()) < 0) |
| 156 | { |
| 157 | perror("fork"); |
| 158 | exit(1); |
| 159 | } |
| 160 | |
| 161 | if (pid == 0) |
| 162 | { |
| 163 | setgid(getgid()); |
| 164 | setuid(getuid()); |
| 165 | |
| 166 | (void)caught(); |
| 167 | execvp(argvec[0], argvec); |
| 168 | |
| 169 | perror(argvec[0]); |
| 170 | exit(1); |
| 171 | } |
| 172 | |
| 173 | while ((pid2=wait(&waitstat)) != pid) |
| 174 | ; |
| 175 | |
| 176 | ll_mail_free(p); |
| 177 | |
| 178 | if (WIFEXITED(waitstat)) |
| 179 | exit(WEXITSTATUS(waitstat)); |
| 180 | exit(EX_TEMPFAIL); |
| 181 | } |
| 182 | if (p) |
| 183 | ll_mail_free(p); |
| 184 | exit(EX_TEMPFAIL); |
| 185 | return (0); |
| 186 | } |
| 187 | |