connect.c

   1 #include "cache.h"
   2 #include "pkt-line.h"
   3 #include <sys/wait.h>
   4
   5 int get_ack(int fd, unsigned char *result_sha1)
   6 {
   7         static char line[1000];
   8         int len = packet_read_line(fd, line, sizeof(line));
   9
  10         if (!len)
  11                 die("git-fetch-pack: expected ACK/NAK, got EOF");
  12         if (line[len-1] == '\n')
  13                 line[--len] = 0;
  14         if (!strcmp(line, "NAK"))
  15                 return 0;
  16         if (!strncmp(line, "ACK ", 3)) {
  17                 if (!get_sha1_hex(line+4, result_sha1))
  18                         return 1;
  19         }
  20         die("git-fetch_pack: expected ACK/NAK, got '%s'", line);
  21 }
  22
  23 int path_match(const char *path, int nr, char **match)
  24 {
  25         int i;
  26         int pathlen = strlen(path);
  27
  28         for (i = 0; i < nr; i++) {
  29                 char *s = match[i];
  30                 int len = strlen(s);
  31
  32                 if (!len || len > pathlen)
  33                         continue;
  34                 if (memcmp(path + pathlen - len, s, len))
  35                         continue;
  36                 if (pathlen > len && path[pathlen - len - 1] != '/')
  37                         continue;
  38                 *s = 0;
  39                 return 1;
  40         }
  41         return 0;
  42 }
  43
  44 /*
  45  * First, make it shell-safe.  We do this by just disallowing any
  46  * special characters. Somebody who cares can do escaping and let
  47  * through the rest. But since we're doing to feed this to ssh as
  48  * a command line, we're going to be pretty damn anal for now.
  49  */
  50 static char *shell_safe(char *url)
  51 {
  52         char *n = url;
  53         unsigned char c;
  54         static const char flags[256] = {
  55                 ['0'...'9'] = 1,
  56                 ['a'...'z'] = 1,
  57                 ['A'...'Z'] = 1,
  58                 ['.'] = 1, ['/'] = 1,
  59                 ['-'] = 1, ['+'] = 1,
  60                 [':'] = 1, ['_'] = 1,
  61                 ['@'] = 1, [','] = 1,
  62                 ['~'] = 1, ['^'] = 1,
  63         };
  64
  65         while ((c = *n++) != 0) {
  66                 if (flags[c] != 1)
  67                         die("I don't like '%c'. Sue me.", c);
  68         }
  69         return url;
  70 }
  71
  72 /*
  73  * Yeah, yeah, fixme. Need to pass in the heads etc.
  74  */
  75 int git_connect(int fd[2], char *url, const char *prog)
  76 {
  77         char command[1024];
  78         const char *host, *path;
  79         char *colon;
  80         int pipefd[2][2];
  81         pid_t pid;
  82
  83         url = shell_safe(url);
  84         host = NULL;
  85         path = url;
  86         colon = strchr(url, ':');
  87         if (colon) {
  88                 *colon = 0;
  89                 host = url;
  90                 path = colon+1;
  91         }
  92         snprintf(command, sizeof(command), "%s %s", prog, path);
  93         if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0)
  94                 die("unable to create pipe pair for communication");
  95         pid = fork();
  96         if (!pid) {
  97                 dup2(pipefd[1][0], 0);
  98                 dup2(pipefd[0][1], 1);
  99                 close(pipefd[0][0]);
 100                 close(pipefd[0][1]);
 101                 close(pipefd[1][0]);
 102                 close(pipefd[1][1]);
 103                 if (host)
 104                         execlp("ssh", "ssh", host, command, NULL);
 105                 else
 106                         execlp("sh", "sh", "-c", command, NULL);
 107                 die("exec failed");
 108         }
 109         fd[0] = pipefd[0][0];
 110         fd[1] = pipefd[1][1];
 111         close(pipefd[0][1]);
 112         close(pipefd[1][0]);
 113         return pid;
 114 }
 115
 116 int finish_connect(pid_t pid)
 117 {
 118         int ret;
 119
 120         for (;;) {
 121                 ret = waitpid(pid, NULL, 0);
 122                 if (!ret)
 123                         break;
 124                 if (errno != EINTR)
 125                         break;
 126         }
 127         return ret;
 128 }