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 "serv_extensions.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
  51         if ((lfp = fopen(LOCKFILE, "r")) != NULL) {
  52                 fscanf(lfp, "%d", &onppid);
  53                 fclose(lfp);
  54                 if (!kill(onppid, 0) || errno == EPERM)
  55                         return 1;
  56         }
  57         lfp = fopen(LOCKFILE, "w");
  58         fprintf(lfp, "%ld\n", (long) getpid());
  59         fclose(lfp);
  60         return (0);
  61 }
  62
  63 void remove_lockfile(void)
  64 {
  65         unlink(LOCKFILE);
  66 }
  67
  68 /*
  69  * Why both cleanup() and nq_cleanup() ?  Notice the alarm() call in
  70  * cleanup() .  If for some reason sendcommand hangs waiting for the server
  71  * to clean up, the alarm clock goes off and the program exits anyway.
  72  * The cleanup() routine makes a check to ensure it's not reentering, in
  73  * case the ipc module looped it somehow.
  74  */
  75 void nq_cleanup(int e)
  76 {
  77         remove_lockfile();
  78         exit(e);
  79 }
  80
  81 void cleanup(int e)
  82 {
  83         static int nested = 0;
  84
  85         alarm(30);
  86         signal(SIGALRM, nq_cleanup);
  87         if (nested++ < 1)
  88                 CtdlIPCQuit(ipc);
  89         nq_cleanup(e);
  90 }
  91
  92 /*
  93  * This is implemented as a function rather than as a macro because the
  94  * client-side IPC modules expect logoff() to be defined.  They call logoff()
  95  * when a problem connecting or staying connected to the server occurs.
  96  */
  97 void logoff(int e)
  98 {
  99         cleanup(e);
 100 }
 101
 102 /*
 103  * Connect sendcommand to the Citadel server running on this computer.
 104  */
 105 void np_attach_to_server(char *host, char *port)
 106 {
 107         char buf[SIZ];
 108         char hostbuf[256], portbuf[256];
 109         char *args[] =
 110         {"sendcommand", NULL};
 111         int r;
 112
 113         fprintf(stderr, "Attaching to server...\n");
 114         strcpy(hostbuf, host);
 115         strcpy(portbuf, port);
 116         ipc = CtdlIPC_new(1, args, hostbuf, portbuf);
 117         if (!ipc) {
 118                 fprintf(stderr, "Can't connect: %s\n", strerror(errno));
 119                 exit(3);
 120         }
 121         CtdlIPC_chat_recv(ipc, buf);
 122         fprintf(stderr, "%s\n", &buf[4]);
 123         snprintf(buf, sizeof buf, "IPGM %d", config.c_ipgm_secret);
 124         r = CtdlIPCInternalProgram(ipc, config.c_ipgm_secret, buf);
 125         fprintf(stderr, "%s\n", buf);
 126         if (r / 100 != 2) {
 127                 cleanup(2);
 128         }
 129 }
 130
 131
 132 void sendcommand_die(void) {
 133         exit(0);
 134 }
 135
 136
 137 /*
 138  * main
 139  */
 140 int main(int argc, char **argv)
 141 {
 142         int a;
 143         char cmd[SIZ];
 144         char buf[SIZ];
 145
 146         int relh=0;
 147         int home=0;
 148         char relhome[PATH_MAX]="";
 149         char ctdldir[PATH_MAX]=CTDLDIR;
 150         fd_set read_fd;
 151         struct timeval tv;
 152         int ret, err;
 153
 154         strcpy(ctdl_home_directory, DEFAULT_PORT);
 155
 156         strcpy(cmd, "");
 157         /*
 158          * Change directories if specified
 159          */
 160         for (a = 1; a < argc; ++a) {
 161                 if (!strncmp(argv[a], "-h", 2)) {
 162                         relh=argv[a][2]!='/';
 163                         if (!relh) safestrncpy(ctdl_home_directory, &argv[a][2],
 164                                                                    sizeof ctdl_home_directory);
 165                         else
 166                                 safestrncpy(relhome, &argv[a][2],
 167                                                         sizeof relhome);
 168                         home_specified = 1;
 169                         home=1;
 170                 } else {
 171                         if (strlen(cmd) > 0)
 172                                 strcat(cmd, " ");
 173                         strcat(cmd, argv[a]);
 174                 }
 175         }
 176
 177         calc_dirs_n_files(relh, home, relhome, ctdldir);
 178         get_config();
 179
 180         signal(SIGINT, cleanup);
 181         signal(SIGQUIT, cleanup);
 182         signal(SIGHUP, cleanup);
 183         signal(SIGTERM, cleanup);
 184
 185         fprintf(stderr, "sendcommand: started (pid=%d) "
 186                         "running in %s\n",
 187                         (int) getpid(),
 188                         ctdl_home_directory);
 189         fflush(stderr);
 190         np_attach_to_server(UDS, ctdl_home_directory);
 191         fflush(stderr);
 192         setIPCDeathHook(sendcommand_die);
 193
 194         fprintf(stderr, "%s\n", cmd);
 195         CtdlIPC_chat_send(ipc, cmd);
 196         CtdlIPC_chat_recv(ipc, buf);
 197         fprintf(stderr, "%s\n", buf);
 198
 199         tv.tv_sec = 0;
 200         tv.tv_usec = 1000;
 201
 202         if (buf[0] == '1') {
 203                 while (CtdlIPC_chat_recv(ipc, buf), strcmp(buf, "000")) {
 204                         printf("%s\n", buf);
 205                 }
 206         } else if (buf[0] == '4') {
 207                 do {
 208                         if (fgets(buf, sizeof buf, stdin) == NULL)
 209                                 strcpy(buf, "000");
 210                         if (strlen(buf) > 0)
 211                                 if (buf[strlen(buf) - 1] == '\n')
 212                                         buf[strlen(buf) - 1] = 0;
 213                         if (strlen(buf) > 0)
 214                                 if (buf[strlen(buf) - 1] == '\r')
 215                                         buf[strlen(buf) - 1] = 0;
 216                         if (strcmp(buf, "000"))
 217                                 CtdlIPC_chat_send(ipc, buf);
 218
 219                         FD_ZERO(&read_fd);
 220                         FD_SET(ipc->sock, &read_fd);
 221                         ret = select(ipc->sock+1, &read_fd, NULL, NULL,  &tv);
 222                         err = errno;
 223                         if (err!=0)
 224                                 printf("select failed: %d", err);
 225
 226                         if (ret == -1) {
 227                                 if (!(errno == EINTR || errno == EAGAIN))
 228                                         printf("select failed: %d", err);
 229                                 return 1;
 230                         }
 231
 232                         if (ret != 0) {
 233                                 size_t n;
 234                                 char rbuf[SIZ];
 235
 236                                 rbuf[0] = '\0';
 237                                 n = read(ipc->sock, rbuf, SIZ);
 238                                 if (n>0) {
 239                                         rbuf[n]='\0';
 240                                         printf (rbuf);
 241                                 }
 242                         }
 243                 } while (strcmp(buf, "000"));
 244                 CtdlIPC_chat_send(ipc, "\n");
 245                 CtdlIPC_chat_send(ipc, "000");
 246         }
 247         fprintf(stderr, "sendcommand: processing ended.\n");
 248         cleanup(0);
 249         return 0;
 250 }