Andrew's git - gitweb.git/blob

   1#include "rsh.h"
   2
   3#include <string.h>
   4#include <sys/types.h>
   5#include <sys/socket.h>
   6
   7#include "cache.h"
   8
   9#define COMMAND_SIZE 4096
  10
  11int setup_connection(int *fd_in, int *fd_out, char *remote_prog, 
  12                     char *url, int rmt_argc, char **rmt_argv)
  13{
  14        char *host;
  15        char *path;
  16        int sv[2];
  17        char command[COMMAND_SIZE];
  18        char *posn;
  19        int i;
  20
  21        if (!strcmp(url, "-")) {
  22                *fd_in = 0;
  23                *fd_out = 1;
  24                return 0;
  25        }
  26
  27        host = strstr(url, "//");
  28        if (!host) {
  29                return error("Bad URL: %s", url);
  30        }
  31        host += 2;
  32        path = strchr(host, '/');
  33        if (!path) {
  34                return error("Bad URL: %s", url);
  35        }
  36        *(path++) = '\0';
  37        /* ssh <host> 'cd /<path>; stdio-pull <arg...> <commit-id>' */
  38        snprintf(command, COMMAND_SIZE, 
  39                 "cd /%s; %s=objects %s",
  40                 path, DB_ENVIRONMENT, remote_prog);
  41        posn = command + strlen(command);
  42        for (i = 0; i < rmt_argc; i++) {
  43                *(posn++) = ' ';
  44                strncpy(posn, rmt_argv[i], COMMAND_SIZE - (posn - command));
  45                posn += strlen(rmt_argv[i]);
  46                if (posn - command + 4 >= COMMAND_SIZE) {
  47                        return error("Command line too long");
  48                }
  49        }
  50        strcpy(posn, " -");
  51        if (socketpair(AF_UNIX, SOCK_STREAM, 0, sv)) {
  52                return error("Couldn't create socket");
  53        }
  54        if (!fork()) {
  55                close(sv[1]);
  56                dup2(sv[0], 0);
  57                dup2(sv[0], 1);
  58                execlp("ssh", "ssh", host, command, NULL);
  59        }
  60        close(sv[0]);
  61        *fd_in = sv[1];
  62        *fd_out = sv[1];
  63        return 0;
  64}