Andrew's git - gitweb.git/blob

   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
  10int 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
  28int 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
  49enum protocol {
  50        PROTO_LOCAL = 1,
  51        PROTO_SSH,
  52        PROTO_GIT,
  53};
  54
  55static 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
  64static 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
  76static 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 */
 109int 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
 168int 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}