awesome-client.c

   1 /*
   2  * awesome-client.c - awesome client, communicate with socket
   3  *
   4  * Copyright © 2007-2008 Julien Danjou <julien@danjou.info>
   5  * Copyright © 2007 daniel@brinkers.de
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  */
  22
  23 #define _GNU_SOURCE
  24
  25 #include <errno.h>
  26 #include <stdio.h>
  27 #include <unistd.h>
  28 #include <sys/socket.h>
  29 #include <sys/un.h>
  30 #include <fcntl.h>
  31
  32 #include <stdio.h>
  33 #include <readline/readline.h>
  34 #include <readline/history.h>
  35
  36 #include "common/socket.h"
  37 #include "common/version.h"
  38 #include "common/util.h"
  39
  40 /* GNU/Hurd workaround */
  41 #ifndef MSG_NOSIGNAL
  42 #define MSG_NOSIGNAL 0
  43 #endif
  44
  45 struct sockaddr_un *addr;
  46 int csfd;
  47 char *display;
  48
  49 /** Initialize the client and server socket connections.
  50  * If something goes wrong, preserves errno.
  51  * \return 0 if everything worked, 1 otherwise.
  52  */
  53 static bool
  54 sockets_init(void)
  55 {
  56     if((csfd = socket_getclient()) < 0)
  57         return false;
  58
  59     if(!(addr = socket_getaddr(display)))
  60         return false;
  61
  62     if(connect(csfd, addr, sizeof(struct sockaddr_un)) == -1)
  63         return false;
  64
  65     return true;
  66 }
  67
  68 /** Close the client and server socket connections.
  69  */
  70 static void
  71 sockets_close(void)
  72 {
  73     close(csfd);
  74     p_delete(&addr);
  75 }
  76
  77 /** Reconnect sockets.
  78  */
  79 static void
  80 sockets_reconnect(void)
  81 {
  82     warn("connection lost, reconnecting…");
  83     sockets_close();
  84     sockets_init();
  85 }
  86
  87 /** Send a message to awesome.
  88  * \param msg The message.
  89  * \param msg_len The message length.
  90  * \return The errno of sendto().
  91  */
  92 static int
  93 send_msg(const char *msg, ssize_t msg_len)
  94 {
  95     #ifndef __FreeBSD__
  96     if(send(csfd, msg, msg_len, MSG_NOSIGNAL | MSG_EOR) == -1)
  97     #else
  98     if(send(csfd, msg, msg_len, MSG_NOSIGNAL | MSG_EOF) == -1)
  99     #endif
 100     {
 101         switch (errno)
 102         {
 103           case ENOENT:
 104             warn("can't write to %s", addr->sun_path);
 105             break;
 106           case EPIPE:
 107           case ENOTCONN:
 108           case ECONNRESET:
 109             sockets_reconnect();
 110             return send_msg(msg, msg_len);
 111           default:
 112             warn("error sending packet: %s", strerror(errno));
 113         }
 114         return errno;
 115     }
 116
 117     return EXIT_SUCCESS;
 118 }
 119
 120
 121 /** Recieve a message from awesome.
 122  */
 123 static void
 124 recv_msg(void)
 125 {
 126     ssize_t r;
 127     char buf[1024];
 128     int try = 10;
 129
 130     while(try)
 131     {
 132         r = recv(csfd, buf, sizeof(buf) - 1, MSG_TRUNC | MSG_DONTWAIT);
 133         if (r < 0)
 134         {
 135             if(errno != EAGAIN)
 136                 return warn("error recieving from UNIX domain socket: %s", strerror(errno));
 137             try--;
 138         }
 139         else
 140             break;
 141         usleep(100000);
 142     }
 143
 144     if(!try)
 145         sockets_reconnect();
 146     else if(r > 0)
 147     {
 148         buf[r] = '\0';
 149         puts(buf);
 150     }
 151 }
 152
 153
 154 /** Print help and exit(2) with given exit_code.
 155  * \param exit_code The exit code.
 156  * \return Never return.
 157  */
 158 static void __attribute__ ((noreturn))
 159 exit_help(int exit_code)
 160 {
 161     FILE *outfile = (exit_code == EXIT_SUCCESS) ? stdout : stderr;
 162     fprintf(outfile, "Usage: awesome-client [--version|--help]\n"
 163             "In normal operation, give no parameters and issue commands "
 164             "on standard input.\n");
 165     exit(exit_code);
 166 }
 167
 168 /** Main function of awesome-client.
 169  * \param argc Number of args.
 170  * \param argv Args array.
 171  * \return Value returned by send_msg().
 172  */
 173 int
 174 main(int argc, char **argv)
 175 {
 176     char buf[1024], *msg, *prompt;
 177     int ret_value = EXIT_SUCCESS;
 178     ssize_t len, msg_len = 1;
 179
 180     if(argc == 2)
 181     {
 182         if(!a_strcmp("-v", argv[1]) || !a_strcmp("--version", argv[1]))
 183             eprint_version("awesome-client");
 184         else if(!a_strcmp("-h", argv[1]) || !a_strcmp("--help", argv[1]))
 185             exit_help(EXIT_SUCCESS);
 186     }
 187     else if(argc > 2)
 188         exit_help(EXIT_SUCCESS);
 189
 190     display = getenv("DISPLAY");
 191
 192     if (!sockets_init())
 193     {
 194         warn("can't connect to UNIX domain socket: %s", strerror(errno));
 195         return EXIT_FAILURE;
 196     }
 197
 198     if(isatty(STDIN_FILENO))
 199     {
 200         asprintf(&prompt, "awesome@%s%% ", display ? display : "unknown");
 201         while((msg = readline(prompt)))
 202             if((msg_len = a_strlen(msg)))
 203             {
 204                 add_history (msg);
 205                 p_realloc(&msg, msg_len + 2);
 206                 msg[msg_len] = '\n';
 207                 msg[msg_len + 1] = '\0';
 208                 if(send_msg(msg, msg_len + 2) == EXIT_SUCCESS)
 209                     recv_msg();
 210                 p_delete(&msg);
 211             }
 212     }
 213     else
 214     {
 215         msg = p_new(char, 1);
 216         while(fgets(buf, sizeof(buf), stdin))
 217         {
 218             len = a_strlen(buf);
 219             if(len < 2 && msg_len > 1)
 220             {
 221                 ret_value = send_msg(msg, msg_len);
 222                 p_delete(&msg);
 223                 if (ret_value != EXIT_SUCCESS)
 224                     return ret_value;
 225                 msg = p_new(char, 1);
 226                 msg_len = 1;
 227             }
 228             else if (len > 1)
 229             {
 230                 msg_len += len;
 231                 p_realloc(&msg, msg_len);
 232                 a_strncat(msg, msg_len, buf, len);
 233             }
 234         }
 235         if(msg_len > 1)
 236         {
 237             if((ret_value = send_msg(msg, msg_len)) == EXIT_SUCCESS)
 238                 recv_msg();
 239         }
 240         p_delete(&msg);
 241     }
 242
 243     sockets_close();
 244     return ret_value;
 245 }
 246
 247 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80