citadel/utils/sendcommand.c

   1 /*
   2  * $Id$
   3  *
   4  * Command-line utility to transmit a server command.
   5  *
   6  */
   7
   8 #include "ctdl_module.h"
   9
  10 #include <stdlib.h>
  11 #include <unistd.h>
  12 #include <sys/types.h>
  13 #include <sys/wait.h>
  14 #include <string.h>
  15 #include <fcntl.h>
  16 #include <stdio.h>
  17 #include <ctype.h>
  18
  19 #if TIME_WITH_SYS_TIME
  20 # include <sys/time.h>
  21 # include <time.h>
  22 #else
  23 # if HAVE_SYS_TIME_H
  24 #  include <sys/time.h>
  25 # else
  26 #  include <time.h>
  27 # endif
  28 #endif
  29
  30 #include <signal.h>
  31 #include <errno.h>
  32 #include <limits.h>
  33 #include <libcitadel.h>
  34 #include "citadel.h"
  35 #include "citadel_ipc.h"
  36 #include "server.h"
  37 #include "config.h"
  38
  39 #define LOCKFILE "/tmp/LCK.sendcommand"
  40
  41 static CtdlIPC *ipc = NULL;
  42
  43 /*
  44  * make sure only one copy of sendcommand runs at a time, using lock files
  45  */
  46 int set_lockfile(void)
  47 {
  48         FILE *lfp;
  49         int onppid;
  50         int rv;
  51
  52         if ((lfp = fopen(LOCKFILE, "r")) != NULL) {
  53                 rv = fscanf(lfp, "%d", &onppid);
  54                 fclose(lfp);
  55                 if (!kill(onppid, 0) || errno == EPERM)
  56                         return 1;
  57         }
  58         lfp = fopen(LOCKFILE, "w");
  59         fprintf(lfp, "%ld\n", (long) getpid());
  60         fclose(lfp);
  61         return (0);
  62 }
  63
  64 void remove_lockfile(void)
  65 {
  66         unlink(LOCKFILE);
  67 }
  68
  69 /*
  70  * Why both cleanup() and nq_cleanup() ?  Notice the alarm() call in
  71  * cleanup() .  If for some reason sendcommand hangs waiting for the server
  72  * to clean up, the alarm clock goes off and the program exits anyway.
  73  * The cleanup() routine makes a check to ensure it's not reentering, in
  74  * case the ipc module looped it somehow.
  75  */
  76 void nq_cleanup(int e)
  77 {
  78         if (e == SIGALRM)
  79                 fprintf(stderr, "\nWatch dog time out.\n");
  80         remove_lockfile();
  81         exit(e);
  82 }
  83
  84 /*
  85  * send binary to server
  86  */
  87 void serv_write(CtdlIPC *ipc, const char *buf, unsigned int nbytes)
  88 {
  89         unsigned int bytes_written = 0;
  90         int retval;
  91 /*
  92 #if defined(HAVE_OPENSSL)
  93         if (ipc->ssl) {
  94                 serv_write_ssl(ipc, buf, nbytes);
  95                 return;
  96         }
  97 #endif
  98 */
  99         while (bytes_written < nbytes) {
 100                 retval = write(ipc->sock, &buf[bytes_written],
 101                                nbytes - bytes_written);
 102                 if (retval < 1) {
 103                         connection_died(ipc, 0);
 104                         return;
 105                 }
 106                 bytes_written += retval;
 107         }
 108 }
 109
 110
 111 void cleanup(int e)
 112 {
 113         static int nested = 0;
 114
 115         alarm(30);
 116         signal(SIGALRM, nq_cleanup);
 117         serv_write(ipc, "\n", 1);
 118         if (nested++ < 1)
 119                 CtdlIPCQuit(ipc);
 120         nq_cleanup(e);
 121 }
 122
 123 /*
 124  * This is implemented as a function rather than as a macro because the
 125  * client-side IPC modules expect logoff() to be defined.  They call logoff()
 126  * when a problem connecting or staying connected to the server occurs.
 127  */
 128 void logoff(int e)
 129 {
 130         cleanup(e);
 131 }
 132
 133 /*
 134  * Connect sendcommand to the Citadel server running on this computer.
 135  */
 136 void np_attach_to_server(char *host, char *port)
 137 {
 138         char buf[SIZ];
 139         char hostbuf[256], portbuf[256];
 140         char *args[] =
 141         {"sendcommand", NULL};
 142         int r;
 143
 144         fprintf(stderr, "Attaching to server...\n");
 145         strcpy(hostbuf, host);
 146         strcpy(portbuf, port);
 147         ipc = CtdlIPC_new(1, args, hostbuf, portbuf);
 148         if (!ipc) {
 149                 fprintf(stderr, "Can't connect: %s\n", strerror(errno));
 150                 exit(3);
 151         }
 152         CtdlIPC_chat_recv(ipc, buf);
 153         fprintf(stderr, "%s\n", &buf[4]);
 154         snprintf(buf, sizeof buf, "IPGM %d", config.c_ipgm_secret);
 155         r = CtdlIPCInternalProgram(ipc, config.c_ipgm_secret, buf);
 156         fprintf(stderr, "%s\n", buf);
 157         if (r / 100 != 2) {
 158                 cleanup(2);
 159         }
 160 }
 161
 162
 163 void sendcommand_die(void) {
 164         exit(0);
 165 }
 166
 167
 168
 169 /*
 170  * main
 171  */
 172 int main(int argc, char **argv)
 173 {
 174         int a;
 175         char cmd[SIZ];
 176         char buf[SIZ];
 177         int watchdog = 60;
 178
 179         int relh=0;
 180         int home=0;
 181         char relhome[PATH_MAX]="";
 182         char ctdldir[PATH_MAX]=CTDLDIR;
 183         fd_set read_fd;
 184         struct timeval tv;
 185         int ret, err;
 186         int server_shutting_down = 0;
 187
 188         strcpy(ctdl_home_directory, DEFAULT_PORT);
 189
 190         strcpy(cmd, "");
 191         /*
 192          * Change directories if specified
 193          */
 194         for (a = 1; a < argc; ++a) {
 195                 if (!strncmp(argv[a], "-h", 2)) {
 196                         relh=argv[a][2]!='/';
 197                         if (!relh) safestrncpy(ctdl_home_directory, &argv[a][2],
 198                                                                    sizeof ctdl_home_directory);
 199                         else
 200                                 safestrncpy(relhome, &argv[a][2],
 201                                                         sizeof relhome);
 202                         home=1;
 203                 } else if (!strncmp(argv[a], "-w", 2)) {
 204                         watchdog = atoi(&argv[a][2]);
 205                         if (watchdog<1)
 206                                 watchdog=1;
 207                 } else {
 208                         if (!IsEmptyStr(cmd))
 209                                 strcat(cmd, " ");
 210                         strcat(cmd, argv[a]);
 211                 }
 212         }
 213
 214         calc_dirs_n_files(relh, home, relhome, ctdldir, 0);
 215         get_config();
 216
 217         signal(SIGINT, cleanup);
 218         signal(SIGQUIT, cleanup);
 219         signal(SIGHUP, cleanup);
 220         signal(SIGTERM, cleanup);
 221
 222         fprintf(stderr, "sendcommand: started (pid=%d) "
 223                         "running in %s\n",
 224                         (int) getpid(),
 225                         ctdl_home_directory);
 226         fflush(stderr);
 227
 228         alarm(watchdog);
 229         signal(SIGALRM, nq_cleanup); /* Set up a watchdog type timer in case we hang */
 230
 231         np_attach_to_server(UDS, ctdl_home_directory);
 232         fflush(stderr);
 233         setIPCDeathHook(sendcommand_die);
 234
 235         fprintf(stderr, "%s\n", cmd);
 236         CtdlIPC_chat_send(ipc, cmd);
 237         CtdlIPC_chat_recv(ipc, buf);
 238         fprintf(stderr, "%s\n", buf);
 239
 240         tv.tv_sec = 0;
 241         tv.tv_usec = 1000;
 242
 243         if (!strncasecmp(&buf[1], "31", 2)) {
 244                 server_shutting_down = 1;
 245         }
 246
 247         if (buf[0] == '1') {
 248                 while (CtdlIPC_chat_recv(ipc, buf), strcmp(buf, "000")) {
 249                         printf("%s\n", buf);
 250                         alarm(watchdog); /* Kick the watchdog timer */
 251                 }
 252         } else if (buf[0] == '4') {
 253                 do {
 254                         if (fgets(buf, sizeof buf, stdin) == NULL)
 255                                 strcpy(buf, "000");
 256                         if (!IsEmptyStr(buf))
 257                                 if (buf[strlen(buf) - 1] == '\n')
 258                                         buf[strlen(buf) - 1] = 0;
 259                         if (!IsEmptyStr(buf))
 260                                 if (buf[strlen(buf) - 1] == '\r')
 261                                         buf[strlen(buf) - 1] = 0;
 262                         if (strcmp(buf, "000"))
 263                                 CtdlIPC_chat_send(ipc, buf);
 264
 265                         FD_ZERO(&read_fd);
 266                         FD_SET(ipc->sock, &read_fd);
 267                         ret = select(ipc->sock+1, &read_fd, NULL, NULL,  &tv);
 268                         err = errno;
 269                         if (err!=0)
 270                                 printf("select failed: %d", err);
 271
 272                         if (ret == -1) {
 273                                 if (!(errno == EINTR || errno == EAGAIN))
 274                                         printf("select failed: %d", err);
 275                                 return 1;
 276                         }
 277
 278                         if (ret != 0) {
 279                                 size_t n;
 280                                 char rbuf[SIZ];
 281
 282                                 rbuf[0] = '\0';
 283                                 n = read(ipc->sock, rbuf, SIZ);
 284                                 if (n>0) {
 285                                         rbuf[n]='\0';
 286                                         fprintf (stderr, rbuf);
 287                                         fflush (stdout);
 288                                 }
 289                         }
 290                         alarm(watchdog); /* Kick the watchdog timer */
 291                 } while (strcmp(buf, "000"));
 292                 CtdlIPC_chat_send(ipc, "\n");
 293                 CtdlIPC_chat_send(ipc, "000");
 294         }
 295         alarm(0);       /* Shutdown the watchdog timer */
 296         fprintf(stderr, "sendcommand: processing ended.\n");
 297
 298         /* Clean up and log off ... unless the server indicated that the command
 299          * we sent is shutting it down, in which case we want to just cut the
 300          * connection and exit.
 301          */
 302         if (server_shutting_down) {
 303                 nq_cleanup(0);
 304         }
 305         else {
 306                 cleanup(0);
 307         }
 308         return 0;
 309 }
 310
 311 /*
 312  * Stub function
 313  */
 314 void stty_ctdl(int cmd) {
 315 }
 316
 317