connect.c

   1 #include "cache.h"
   2 #include "pkt-line.h"
   3 #include "quote.h"
   4 #include <sys/wait.h>
   5 #include <sys/socket.h>
   6 #include <netinet/in.h>
   7 #include <arpa/inet.h>
   8 #include <netdb.h>
   9
  10 int get_ack(int fd, unsigned char *result_sha1)
  11 {
  12         static char line[1000];
  13         int len = packet_read_line(fd, line, sizeof(line));
  14
  15         if (!len)
  16                 die("git-fetch-pack: expected ACK/NAK, got EOF");
  17         if (line[len-1] == '\n')
  18                 line[--len] = 0;
  19         if (!strcmp(line, "NAK"))
  20                 return 0;
  21         if (!strncmp(line, "ACK ", 3)) {
  22                 if (!get_sha1_hex(line+4, result_sha1))
  23                         return 1;
  24         }
  25         die("git-fetch_pack: expected ACK/NAK, got '%s'", line);
  26 }
  27
  28 int path_match(const char *path, int nr, char **match)
  29 {
  30         int i;
  31         int pathlen = strlen(path);
  32
  33         for (i = 0; i < nr; i++) {
  34                 char *s = match[i];
  35                 int len = strlen(s);
  36
  37                 if (!len || len > pathlen)
  38                         continue;
  39                 if (memcmp(path + pathlen - len, s, len))
  40                         continue;
  41                 if (pathlen > len && path[pathlen - len - 1] != '/')
  42                         continue;
  43                 *s = 0;
  44                 return 1;
  45         }
  46         return 0;
  47 }
  48
  49 enum protocol {
  50         PROTO_LOCAL = 1,
  51         PROTO_SSH,
  52         PROTO_GIT,
  53 };
  54
  55 static enum protocol get_protocol(const char *name)
  56 {
  57         if (!strcmp(name, "ssh"))
  58                 return PROTO_SSH;
  59         if (!strcmp(name, "git"))
  60                 return PROTO_GIT;
  61         die("I don't handle protocol '%s'", name);
  62 }
  63
  64 static void lookup_host(const char *host, struct sockaddr *in)
  65 {
  66         struct addrinfo *res;
  67         int ret;
  68
  69         ret = getaddrinfo(host, NULL, NULL, &res);
  70         if (ret)
  71                 die("Unable to look up %s (%s)", host, gai_strerror(ret));
  72         *in = *res->ai_addr;
  73         freeaddrinfo(res);
  74 }
  75
  76 static int git_tcp_connect(int fd[2], const char *prog, char *host, char *path)
  77 {
  78         struct sockaddr addr;
  79         int port = DEFAULT_GIT_PORT, sockfd;
  80         char *colon;
  81
  82         colon = strchr(host, ':');
  83         if (colon) {
  84                 char *end;
  85                 unsigned long n = strtoul(colon+1, &end, 0);
  86                 if (colon[1] && !*end) {
  87                         *colon = 0;
  88                         port = n;
  89                 }
  90         }
  91
  92         lookup_host(host, &addr);
  93         ((struct sockaddr_in *)&addr)->sin_port = htons(port);
  94
  95         sockfd = socket(PF_INET, SOCK_STREAM, IPPROTO_IP);
  96         if (sockfd < 0)
  97                 die("unable to create socket (%s)", strerror(errno));
  98         if (connect(sockfd, (void *)&addr, sizeof(addr)) < 0)
  99                 die("unable to connect (%s)", strerror(errno));
 100         fd[0] = sockfd;
 101         fd[1] = sockfd;
 102         packet_write(sockfd, "%s %s\n", prog, path);
 103         return 0;
 104 }
 105
 106 /*
 107  * Yeah, yeah, fixme. Need to pass in the heads etc.
 108  */
 109 int git_connect(int fd[2], char *url, const char *prog)
 110 {
 111         char command[1024];
 112         char *host, *path;
 113         char *colon;
 114         int pipefd[2][2];
 115         pid_t pid;
 116         enum protocol protocol;
 117
 118         host = NULL;
 119         path = url;
 120         colon = strchr(url, ':');
 121         protocol = PROTO_LOCAL;
 122         if (colon) {
 123                 *colon = 0;
 124                 host = url;
 125                 path = colon+1;
 126                 protocol = PROTO_SSH;
 127                 if (!memcmp(path, "//", 2)) {
 128                         char *slash = strchr(path + 2, '/');
 129                         if (slash) {
 130                                 int nr = slash - path - 2;
 131                                 memmove(path, path+2, nr);
 132                                 path[nr] = 0;
 133                                 protocol = get_protocol(url);
 134                                 host = path;
 135                                 path = slash;
 136                         }
 137                 }
 138         }
 139
 140         if (protocol == PROTO_GIT)
 141                 return git_tcp_connect(fd, prog, host, path);
 142
 143         if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0)
 144                 die("unable to create pipe pair for communication");
 145         pid = fork();
 146         if (!pid) {
 147                 snprintf(command, sizeof(command), "%s %s", prog,
 148                          sq_quote(path));
 149                 dup2(pipefd[1][0], 0);
 150                 dup2(pipefd[0][1], 1);
 151                 close(pipefd[0][0]);
 152                 close(pipefd[0][1]);
 153                 close(pipefd[1][0]);
 154                 close(pipefd[1][1]);
 155                 if (protocol == PROTO_SSH)
 156                         execlp("ssh", "ssh", host, command, NULL);
 157                 else
 158                         execlp("sh", "sh", "-c", command, NULL);
 159                 die("exec failed");
 160         }
 161         fd[0] = pipefd[0][0];
 162         fd[1] = pipefd[1][1];
 163         close(pipefd[0][1]);
 164         close(pipefd[1][0]);
 165         return pid;
 166 }
 167
 168 int finish_connect(pid_t pid)
 169 {
 170         int ret;
 171
 172         for (;;) {
 173                 ret = waitpid(pid, NULL, 0);
 174                 if (!ret)
 175                         break;
 176                 if (errno != EINTR)
 177                         break;
 178         }
 179         return ret;
 180 }