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 /*
  11  * Read all the refs from the other end
  12  */
  13 struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match)
  14 {
  15         *list = NULL;
  16         for (;;) {
  17                 struct ref *ref;
  18                 unsigned char old_sha1[20];
  19                 static char buffer[1000];
  20                 char *name;
  21                 int len;
  22
  23                 len = packet_read_line(in, buffer, sizeof(buffer));
  24                 if (!len)
  25                         break;
  26                 if (buffer[len-1] == '\n')
  27                         buffer[--len] = 0;
  28
  29                 if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
  30                         die("protocol error: expected sha/ref, got '%s'", buffer);
  31                 name = buffer + 41;
  32                 if (nr_match && !path_match(name, nr_match, match))
  33                         continue;
  34                 ref = xmalloc(sizeof(*ref) + len - 40);
  35                 memcpy(ref->old_sha1, old_sha1, 20);
  36                 memset(ref->new_sha1, 0, 20);
  37                 memcpy(ref->name, buffer + 41, len - 40);
  38                 ref->next = NULL;
  39                 *list = ref;
  40                 list = &ref->next;
  41         }
  42         return list;
  43 }
  44
  45 int get_ack(int fd, unsigned char *result_sha1)
  46 {
  47         static char line[1000];
  48         int len = packet_read_line(fd, line, sizeof(line));
  49
  50         if (!len)
  51                 die("git-fetch-pack: expected ACK/NAK, got EOF");
  52         if (line[len-1] == '\n')
  53                 line[--len] = 0;
  54         if (!strcmp(line, "NAK"))
  55                 return 0;
  56         if (!strncmp(line, "ACK ", 3)) {
  57                 if (!get_sha1_hex(line+4, result_sha1))
  58                         return 1;
  59         }
  60         die("git-fetch_pack: expected ACK/NAK, got '%s'", line);
  61 }
  62
  63 int path_match(const char *path, int nr, char **match)
  64 {
  65         int i;
  66         int pathlen = strlen(path);
  67
  68         for (i = 0; i < nr; i++) {
  69                 char *s = match[i];
  70                 int len = strlen(s);
  71
  72                 if (!len || len > pathlen)
  73                         continue;
  74                 if (memcmp(path + pathlen - len, s, len))
  75                         continue;
  76                 if (pathlen > len && path[pathlen - len - 1] != '/')
  77                         continue;
  78                 *s = 0;
  79                 return 1;
  80         }
  81         return 0;
  82 }
  83
  84 enum protocol {
  85         PROTO_LOCAL = 1,
  86         PROTO_SSH,
  87         PROTO_GIT,
  88 };
  89
  90 static enum protocol get_protocol(const char *name)
  91 {
  92         if (!strcmp(name, "ssh"))
  93                 return PROTO_SSH;
  94         if (!strcmp(name, "git"))
  95                 return PROTO_GIT;
  96         die("I don't handle protocol '%s'", name);
  97 }
  98
  99 #define STR_(s) # s
 100 #define STR(s)  STR_(s)
 101
 102 static int git_tcp_connect(int fd[2], const char *prog, char *host, char *path)
 103 {
 104         int sockfd = -1;
 105         char *colon, *end;
 106         char *port = STR(DEFAULT_GIT_PORT);
 107         struct addrinfo hints, *ai0, *ai;
 108         int gai;
 109
 110         if (host[0] == '[') {
 111                 end = strchr(host + 1, ']');
 112                 if (end) {
 113                         *end = 0;
 114                         end++;
 115                         host++;
 116                 } else
 117                         end = host;
 118         } else
 119                 end = host;
 120         colon = strchr(end, ':');
 121
 122         if (colon) {
 123                 *colon = 0;
 124                 port = colon + 1;
 125         }
 126
 127         memset(&hints, 0, sizeof(hints));
 128         hints.ai_socktype = SOCK_STREAM;
 129         hints.ai_protocol = IPPROTO_TCP;
 130
 131         gai = getaddrinfo(host, port, &hints, &ai);
 132         if (gai)
 133                 die("Unable to look up %s (%s)", host, gai_strerror(gai));
 134
 135         for (ai0 = ai; ai; ai = ai->ai_next) {
 136                 sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
 137                 if (sockfd < 0)
 138                         continue;
 139                 if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
 140                         close(sockfd);
 141                         sockfd = -1;
 142                         continue;
 143                 }
 144                 break;
 145         }
 146
 147         freeaddrinfo(ai0);
 148
 149         if (sockfd < 0)
 150                 die("unable to connect a socket (%s)", strerror(errno));
 151
 152         fd[0] = sockfd;
 153         fd[1] = sockfd;
 154         packet_write(sockfd, "%s %s\n", prog, path);
 155         return 0;
 156 }
 157
 158 /*
 159  * Yeah, yeah, fixme. Need to pass in the heads etc.
 160  */
 161 int git_connect(int fd[2], char *url, const char *prog)
 162 {
 163         char command[1024];
 164         char *host, *path;
 165         char *colon;
 166         int pipefd[2][2];
 167         pid_t pid;
 168         enum protocol protocol;
 169
 170         host = NULL;
 171         path = url;
 172         colon = strchr(url, ':');
 173         protocol = PROTO_LOCAL;
 174         if (colon) {
 175                 *colon = 0;
 176                 host = url;
 177                 path = colon+1;
 178                 protocol = PROTO_SSH;
 179                 if (!memcmp(path, "//", 2)) {
 180                         char *slash = strchr(path + 2, '/');
 181                         if (slash) {
 182                                 int nr = slash - path - 2;
 183                                 memmove(path, path+2, nr);
 184                                 path[nr] = 0;
 185                                 protocol = get_protocol(url);
 186                                 host = path;
 187                                 path = slash;
 188                         }
 189                 }
 190         }
 191
 192         if (protocol == PROTO_GIT)
 193                 return git_tcp_connect(fd, prog, host, path);
 194
 195         if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0)
 196                 die("unable to create pipe pair for communication");
 197         pid = fork();
 198         if (!pid) {
 199                 snprintf(command, sizeof(command), "%s %s", prog,
 200                          sq_quote(path));
 201                 dup2(pipefd[1][0], 0);
 202                 dup2(pipefd[0][1], 1);
 203                 close(pipefd[0][0]);
 204                 close(pipefd[0][1]);
 205                 close(pipefd[1][0]);
 206                 close(pipefd[1][1]);
 207                 if (protocol == PROTO_SSH)
 208                         execlp("ssh", "ssh", host, command, NULL);
 209                 else
 210                         execlp("sh", "sh", "-c", command, NULL);
 211                 die("exec failed");
 212         }
 213         fd[0] = pipefd[0][0];
 214         fd[1] = pipefd[1][1];
 215         close(pipefd[0][1]);
 216         close(pipefd[1][0]);
 217         return pid;
 218 }
 219
 220 int finish_connect(pid_t pid)
 221 {
 222         int ret;
 223
 224         for (;;) {
 225                 ret = waitpid(pid, NULL, 0);
 226                 if (!ret)
 227                         break;
 228                 if (errno != EINTR)
 229                         break;
 230         }
 231         return ret;
 232 }