send-pack.c

   1 #include "cache.h"
   2 #include "pkt-line.h"
   3
   4 static const char send_pack_usage[] = "git-send-pack [--exec=other] destination [heads]*";
   5
   6 static const char *exec = "git-receive-pack";
   7
   8 static int send_pack(int in, int out)
   9 {
  10         for (;;) {
  11                 static char buffer[1000];
  12                 int len;
  13
  14                 len = packet_read_line(in, buffer, sizeof(buffer));
  15                 if (len > 0) {
  16                         write(2, buffer, len);
  17                         continue;
  18                 }
  19                 break;
  20         }
  21         packet_flush(out);
  22         close(out);
  23         return 0;
  24 }
  25
  26 /*
  27  * First, make it shell-safe.  We do this by just disallowing any
  28  * special characters. Somebody who cares can do escaping and let
  29  * through the rest. But since we're doing to feed this to ssh as
  30  * a command line, we're going to be pretty damn anal for now.
  31  */
  32 static char *shell_safe(char *url)
  33 {
  34         char *n = url;
  35         unsigned char c;
  36         static const char flags[256] = {
  37                 ['0'...'9'] = 1,
  38                 ['a'...'z'] = 1,
  39                 ['A'...'Z'] = 1,
  40                 ['.'] = 1, ['/'] = 1,
  41                 ['-'] = 1, ['+'] = 1,
  42                 [':'] = 1
  43         };
  44
  45         while ((c = *n++) != 0) {
  46                 if (flags[c] != 1)
  47                         die("I don't like '%c'. Sue me.", c);
  48         }
  49         return url;
  50 }
  51
  52 /*
  53  * Yeah, yeah, fixme. Need to pass in the heads etc.
  54  */
  55 static int setup_connection(int fd[2], char *url, char **heads)
  56 {
  57         char command[1024];
  58         const char *host, *path;
  59         char *colon;
  60         int pipefd[2][2];
  61
  62         url = shell_safe(url);
  63         host = NULL;
  64         path = url;
  65         colon = strchr(url, ':');
  66         if (colon) {
  67                 *colon = 0;
  68                 host = url;
  69                 path = colon+1;
  70         }
  71         snprintf(command, sizeof(command), "%s %s", exec, path);
  72         if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0)
  73                 die("unable to create pipe pair for communication");
  74         if (!fork()) {
  75                 dup2(pipefd[1][0], 0);
  76                 dup2(pipefd[0][1], 1);
  77                 close(pipefd[0][0]);
  78                 close(pipefd[0][1]);
  79                 close(pipefd[1][0]);
  80                 close(pipefd[1][1]);
  81                 if (host)
  82                         execlp("ssh", "ssh", host, command, NULL);
  83                 else
  84                         execlp("sh", "sh", "-c", command, NULL);
  85                 die("exec failed");
  86         }
  87         fd[0] = pipefd[0][0];
  88         fd[1] = pipefd[1][1];
  89         close(pipefd[0][1]);
  90         close(pipefd[1][0]);
  91         return 0;
  92 }
  93
  94 int main(int argc, char **argv)
  95 {
  96         int i, nr_heads = 0;
  97         char *dest = NULL;
  98         char **heads = NULL;
  99         int fd[2];
 100
 101         argv++;
 102         for (i = 1; i < argc; i++) {
 103                 char *arg = *argv++;
 104
 105                 if (*arg == '-') {
 106                         if (!strncmp(arg, "--exec=", 7)) {
 107                                 exec = arg + 7;
 108                                 continue;
 109                         }
 110                         usage(send_pack_usage);
 111                 }
 112                 dest = arg;
 113                 heads = argv;
 114                 nr_heads = argc - i -1;
 115                 break;
 116         }
 117         if (!dest)
 118                 usage(send_pack_usage);
 119         if (setup_connection(fd, dest, heads))
 120                 return 1;
 121         return send_pack(fd[0], fd[1]);
 122 }