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 static void lookup_host(const char *host, struct sockaddr *in)
 100 {
 101         struct addrinfo *res;
 102         int ret;
 103
 104         ret = getaddrinfo(host, NULL, NULL, &res);
 105         if (ret)
 106                 die("Unable to look up %s (%s)", host, gai_strerror(ret));
 107         *in = *res->ai_addr;
 108         freeaddrinfo(res);
 109 }
 110
 111 static int git_tcp_connect(int fd[2], const char *prog, char *host, char *path)
 112 {
 113         struct sockaddr addr;
 114         int port = DEFAULT_GIT_PORT, sockfd;
 115         char *colon;
 116
 117         colon = strchr(host, ':');
 118         if (colon) {
 119                 char *end;
 120                 unsigned long n = strtoul(colon+1, &end, 0);
 121                 if (colon[1] && !*end) {
 122                         *colon = 0;
 123                         port = n;
 124                 }
 125         }
 126
 127         lookup_host(host, &addr);
 128         ((struct sockaddr_in *)&addr)->sin_port = htons(port);
 129
 130         sockfd = socket(PF_INET, SOCK_STREAM, IPPROTO_IP);
 131         if (sockfd < 0)
 132                 die("unable to create socket (%s)", strerror(errno));
 133         if (connect(sockfd, (void *)&addr, sizeof(addr)) < 0)
 134                 die("unable to connect (%s)", strerror(errno));
 135         fd[0] = sockfd;
 136         fd[1] = sockfd;
 137         packet_write(sockfd, "%s %s\n", prog, path);
 138         return 0;
 139 }
 140
 141 /*
 142  * Yeah, yeah, fixme. Need to pass in the heads etc.
 143  */
 144 int git_connect(int fd[2], char *url, const char *prog)
 145 {
 146         char command[1024];
 147         char *host, *path;
 148         char *colon;
 149         int pipefd[2][2];
 150         pid_t pid;
 151         enum protocol protocol;
 152
 153         host = NULL;
 154         path = url;
 155         colon = strchr(url, ':');
 156         protocol = PROTO_LOCAL;
 157         if (colon) {
 158                 *colon = 0;
 159                 host = url;
 160                 path = colon+1;
 161                 protocol = PROTO_SSH;
 162                 if (!memcmp(path, "//", 2)) {
 163                         char *slash = strchr(path + 2, '/');
 164                         if (slash) {
 165                                 int nr = slash - path - 2;
 166                                 memmove(path, path+2, nr);
 167                                 path[nr] = 0;
 168                                 protocol = get_protocol(url);
 169                                 host = path;
 170                                 path = slash;
 171                         }
 172                 }
 173         }
 174
 175         if (protocol == PROTO_GIT)
 176                 return git_tcp_connect(fd, prog, host, path);
 177
 178         if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0)
 179                 die("unable to create pipe pair for communication");
 180         pid = fork();
 181         if (!pid) {
 182                 snprintf(command, sizeof(command), "%s %s", prog,
 183                          sq_quote(path));
 184                 dup2(pipefd[1][0], 0);
 185                 dup2(pipefd[0][1], 1);
 186                 close(pipefd[0][0]);
 187                 close(pipefd[0][1]);
 188                 close(pipefd[1][0]);
 189                 close(pipefd[1][1]);
 190                 if (protocol == PROTO_SSH)
 191                         execlp("ssh", "ssh", host, command, NULL);
 192                 else
 193                         execlp("sh", "sh", "-c", command, NULL);
 194                 die("exec failed");
 195         }
 196         fd[0] = pipefd[0][0];
 197         fd[1] = pipefd[1][1];
 198         close(pipefd[0][1]);
 199         close(pipefd[1][0]);
 200         return pid;
 201 }
 202
 203 int finish_connect(pid_t pid)
 204 {
 205         int ret;
 206
 207         for (;;) {
 208                 ret = waitpid(pid, NULL, 0);
 209                 if (!ret)
 210                         break;
 211                 if (errno != EINTR)
 212                         break;
 213         }
 214         return ret;
 215 }