credential-cache.c

   1 #include "cache.h"
   2 #include "credential.h"
   3 #include "string-list.h"
   4 #include "parse-options.h"
   5 #include "unix-socket.h"
   6 #include "run-command.h"
   7
   8 #define FLAG_SPAWN 0x1
   9 #define FLAG_RELAY 0x2
  10
  11 static int send_request(const char *socket, const struct strbuf *out)
  12 {
  13         int got_data = 0;
  14         int fd = unix_stream_connect(socket);
  15
  16         if (fd < 0)
  17                 return -1;
  18
  19         if (write_in_full(fd, out->buf, out->len) < 0)
  20                 die_errno("unable to write to cache daemon");
  21         shutdown(fd, SHUT_WR);
  22
  23         while (1) {
  24                 char in[1024];
  25                 int r;
  26
  27                 r = read_in_full(fd, in, sizeof(in));
  28                 if (r == 0)
  29                         break;
  30                 if (r < 0)
  31                         die_errno("read error from cache daemon");
  32                 write_or_die(1, in, r);
  33                 got_data = 1;
  34         }
  35         return got_data;
  36 }
  37
  38 static void spawn_daemon(const char *socket)
  39 {
  40         struct child_process daemon = CHILD_PROCESS_INIT;
  41         const char *argv[] = { NULL, NULL, NULL };
  42         char buf[128];
  43         int r;
  44
  45         argv[0] = "git-credential-cache--daemon";
  46         argv[1] = socket;
  47         daemon.argv = argv;
  48         daemon.no_stdin = 1;
  49         daemon.out = -1;
  50
  51         if (start_command(&daemon))
  52                 die_errno("unable to start cache daemon");
  53         r = read_in_full(daemon.out, buf, sizeof(buf));
  54         if (r < 0)
  55                 die_errno("unable to read result code from cache daemon");
  56         if (r != 3 || memcmp(buf, "ok\n", 3))
  57                 die("cache daemon did not start: %.*s", r, buf);
  58         close(daemon.out);
  59 }
  60
  61 static void do_cache(const char *socket, const char *action, int timeout,
  62                      int flags)
  63 {
  64         struct strbuf buf = STRBUF_INIT;
  65
  66         strbuf_addf(&buf, "action=%s\n", action);
  67         strbuf_addf(&buf, "timeout=%d\n", timeout);
  68         if (flags & FLAG_RELAY) {
  69                 if (strbuf_read(&buf, 0, 0) < 0)
  70                         die_errno("unable to relay credential");
  71         }
  72
  73         if (send_request(socket, &buf) < 0) {
  74                 if (errno != ENOENT && errno != ECONNREFUSED)
  75                         die_errno("unable to connect to cache daemon");
  76                 if (flags & FLAG_SPAWN) {
  77                         spawn_daemon(socket);
  78                         if (send_request(socket, &buf) < 0)
  79                                 die_errno("unable to connect to cache daemon");
  80                 }
  81         }
  82         strbuf_release(&buf);
  83 }
  84
  85 int main(int argc, const char **argv)
  86 {
  87         char *socket_path = NULL;
  88         int timeout = 900;
  89         const char *op;
  90         const char * const usage[] = {
  91                 "git credential-cache [options] <action>",
  92                 NULL
  93         };
  94         struct option options[] = {
  95                 OPT_INTEGER(0, "timeout", &timeout,
  96                             "number of seconds to cache credentials"),
  97                 OPT_STRING(0, "socket", &socket_path, "path",
  98                            "path of cache-daemon socket"),
  99                 OPT_END()
 100         };
 101
 102         argc = parse_options(argc, argv, NULL, options, usage, 0);
 103         if (!argc)
 104                 usage_with_options(usage, options);
 105         op = argv[0];
 106
 107         if (!socket_path)
 108                 socket_path = expand_user_path("~/.git-credential-cache/socket");
 109         if (!socket_path)
 110                 die("unable to find a suitable socket path; use --socket");
 111
 112         if (!strcmp(op, "exit"))
 113                 do_cache(socket_path, op, timeout, 0);
 114         else if (!strcmp(op, "get") || !strcmp(op, "erase"))
 115                 do_cache(socket_path, op, timeout, FLAG_RELAY);
 116         else if (!strcmp(op, "store"))
 117                 do_cache(socket_path, op, timeout, FLAG_RELAY|FLAG_SPAWN);
 118         else
 119                 ; /* ignore unknown operation */
 120
 121         return 0;
 122 }