citadel/sendcommand.c

   1 /*
   2  * $Id$
   3  *
   4  * Command-line utility to transmit a server command.
   5  *
   6  */
   7
   8
   9 #include <stdlib.h>
  10 #include <unistd.h>
  11 #include <sys/types.h>
  12 #include <sys/wait.h>
  13 #include <string.h>
  14 #include <fcntl.h>
  15 #include <stdio.h>
  16 #include <ctype.h>
  17
  18 #if TIME_WITH_SYS_TIME
  19 # include <sys/time.h>
  20 # include <time.h>
  21 #else
  22 # if HAVE_SYS_TIME_H
  23 #  include <sys/time.h>
  24 # else
  25 #  include <time.h>
  26 # endif
  27 #endif
  28
  29 #include <signal.h>
  30 #include <errno.h>
  31 #include <limits.h>
  32 #include "citadel.h"
  33 #include "tools.h"
  34 #include "citadel_ipc.h"
  35 #include "server.h"
  36 #include "config.h"
  37
  38 #define LOCKFILE "/tmp/LCK.sendcommand"
  39
  40 static CtdlIPC *ipc = NULL;
  41
  42 /*
  43  * make sure only one copy of sendcommand runs at a time, using lock files
  44  */
  45 int set_lockfile(void)
  46 {
  47         FILE *lfp;
  48         int onppid;
  49
  50         if ((lfp = fopen(LOCKFILE, "r")) != NULL) {
  51                 fscanf(lfp, "%d", &onppid);
  52                 fclose(lfp);
  53                 if (!kill(onppid, 0) || errno == EPERM)
  54                         return 1;
  55         }
  56         lfp = fopen(LOCKFILE, "w");
  57         fprintf(lfp, "%ld\n", (long) getpid());
  58         fclose(lfp);
  59         return (0);
  60 }
  61
  62 void remove_lockfile(void)
  63 {
  64         unlink(LOCKFILE);
  65 }
  66
  67 /*
  68  * Why both cleanup() and nq_cleanup() ?  Notice the alarm() call in
  69  * cleanup() .  If for some reason sendcommand hangs waiting for the server
  70  * to clean up, the alarm clock goes off and the program exits anyway.
  71  * The cleanup() routine makes a check to ensure it's not reentering, in
  72  * case the ipc module looped it somehow.
  73  */
  74 void nq_cleanup(int e)
  75 {
  76         remove_lockfile();
  77         exit(e);
  78 }
  79
  80 void cleanup(int e)
  81 {
  82         static int nested = 0;
  83
  84         alarm(30);
  85         signal(SIGALRM, nq_cleanup);
  86         if (nested++ < 1)
  87                 CtdlIPCQuit(ipc);
  88         nq_cleanup(e);
  89 }
  90
  91 /*
  92  * This is implemented as a function rather than as a macro because the
  93  * client-side IPC modules expect logoff() to be defined.  They call logoff()
  94  * when a problem connecting or staying connected to the server occurs.
  95  */
  96 void logoff(int e)
  97 {
  98         cleanup(e);
  99 }
 100
 101 /*
 102  * Connect sendcommand to the Citadel server running on this computer.
 103  */
 104 void np_attach_to_server(char *host, char *port)
 105 {
 106         char buf[SIZ];
 107         char hostbuf[256], portbuf[256];
 108         char *args[] =
 109         {"sendcommand", NULL};
 110         int r;
 111
 112         fprintf(stderr, "Attaching to server...\n");
 113         strcpy(hostbuf, host);
 114         strcpy(portbuf, port);
 115         ipc = CtdlIPC_new(1, args, hostbuf, portbuf);
 116         if (!ipc) {
 117                 fprintf(stderr, "Can't connect: %s\n", strerror(errno));
 118                 exit(3);
 119         }
 120         CtdlIPC_chat_recv(ipc, buf);
 121         fprintf(stderr, "%s\n", &buf[4]);
 122         snprintf(buf, sizeof buf, "IPGM %d", config.c_ipgm_secret);
 123         r = CtdlIPCInternalProgram(ipc, config.c_ipgm_secret, buf);
 124         fprintf(stderr, "%s\n", buf);
 125         if (r / 100 != 2) {
 126                 cleanup(2);
 127         }
 128 }
 129
 130
 131 void sendcommand_die(void) {
 132         exit(0);
 133 }
 134
 135
 136 /*
 137  * main
 138  */
 139 int main(int argc, char **argv)
 140 {
 141         int a;
 142         char cmd[SIZ];
 143         char buf[SIZ];
 144
 145         int relh=0;
 146         int home=0;
 147         char relhome[PATH_MAX]="";
 148         char ctdldir[PATH_MAX]=CTDLDIR;
 149         fd_set read_fd;
 150         struct timeval tv;
 151         int ret, err;
 152
 153         CtdlInitBase64Table();
 154
 155         strcpy(ctdl_home_directory, DEFAULT_PORT);
 156
 157         strcpy(cmd, "");
 158         /*
 159          * Change directories if specified
 160          */
 161         for (a = 1; a < argc; ++a) {
 162                 if (!strncmp(argv[a], "-h", 2)) {
 163                         relh=argv[a][2]!='/';
 164                         if (!relh) safestrncpy(ctdl_home_directory, &argv[a][2],
 165                                                                    sizeof ctdl_home_directory);
 166                         else
 167                                 safestrncpy(relhome, &argv[a][2],
 168                                                         sizeof relhome);
 169                         home_specified = 1;
 170                         home=1;
 171                 } else {
 172                         if (!IsEmptyStr(cmd))
 173                                 strcat(cmd, " ");
 174                         strcat(cmd, argv[a]);
 175                 }
 176         }
 177
 178         calc_dirs_n_files(relh, home, relhome, ctdldir);
 179         get_config();
 180
 181         signal(SIGINT, cleanup);
 182         signal(SIGQUIT, cleanup);
 183         signal(SIGHUP, cleanup);
 184         signal(SIGTERM, cleanup);
 185
 186         fprintf(stderr, "sendcommand: started (pid=%d) "
 187                         "running in %s\n",
 188                         (int) getpid(),
 189                         ctdl_home_directory);
 190         fflush(stderr);
 191
 192         alarm(5);
 193         signal(SIGALRM, nq_cleanup); /* Set up a watchdog type timer in case we hang */
 194
 195         np_attach_to_server(UDS, ctdl_home_directory);
 196         fflush(stderr);
 197         setIPCDeathHook(sendcommand_die);
 198
 199         fprintf(stderr, "%s\n", cmd);
 200         CtdlIPC_chat_send(ipc, cmd);
 201         CtdlIPC_chat_recv(ipc, buf);
 202         fprintf(stderr, "%s\n", buf);
 203
 204         tv.tv_sec = 0;
 205         tv.tv_usec = 1000;
 206
 207         if (buf[0] == '1') {
 208                 while (CtdlIPC_chat_recv(ipc, buf), strcmp(buf, "000")) {
 209                         printf("%s\n", buf);
 210                         alarm(5); /* Kick the watchdog timer */
 211                 }
 212         } else if (buf[0] == '4') {
 213                 do {
 214                         if (fgets(buf, sizeof buf, stdin) == NULL)
 215                                 strcpy(buf, "000");
 216                         if (!IsEmptyStr(buf))
 217                                 if (buf[strlen(buf) - 1] == '\n')
 218                                         buf[strlen(buf) - 1] = 0;
 219                         if (!IsEmptyStr(buf))
 220                                 if (buf[strlen(buf) - 1] == '\r')
 221                                         buf[strlen(buf) - 1] = 0;
 222                         if (strcmp(buf, "000"))
 223                                 CtdlIPC_chat_send(ipc, buf);
 224
 225                         FD_ZERO(&read_fd);
 226                         FD_SET(ipc->sock, &read_fd);
 227                         ret = select(ipc->sock+1, &read_fd, NULL, NULL,  &tv);
 228                         err = errno;
 229                         if (err!=0)
 230                                 printf("select failed: %d", err);
 231
 232                         if (ret == -1) {
 233                                 if (!(errno == EINTR || errno == EAGAIN))
 234                                         printf("select failed: %d", err);
 235                                 return 1;
 236                         }
 237
 238                         if (ret != 0) {
 239                                 size_t n;
 240                                 char rbuf[SIZ];
 241
 242                                 rbuf[0] = '\0';
 243                                 n = read(ipc->sock, rbuf, SIZ);
 244                                 if (n>0) {
 245                                         rbuf[n]='\0';
 246                                         fprintf (stderr, rbuf);
 247                                         fflush (stdout);
 248                                 }
 249                         }
 250                         alarm(5); /* Kick the watchdog timer */
 251                 } while (strcmp(buf, "000"));
 252                 CtdlIPC_chat_send(ipc, "\n");
 253                 CtdlIPC_chat_send(ipc, "000");
 254         }
 255         alarm(0);       /* Shutdown the watchdog timer */
 256         fprintf(stderr, "sendcommand: processing ended.\n");
 257         if (strcasecmp(cmd, "DOWN"))
 258                 cleanup(0);
 259         else    /* If we downed the server we can't to do CtdlIPCQuit in cleanup()*/
 260                 nq_cleanup(0);
 261         return 0;
 262 }