builtin/remote-fd.c

   1 #include "git-compat-util.h"
   2 #include "transport.h"
   3
   4 /*
   5  * URL syntax:
   6  *      'fd::<inoutfd>[/<anything>]'            Read/write socket pair
   7  *                                              <inoutfd>.
   8  *      'fd::<infd>,<outfd>[/<anything>]'       Read pipe <infd> and write
   9  *                                              pipe <outfd>.
  10  *      [foo] indicates 'foo' is optional. <anything> is any string.
  11  *
  12  * The data output to <outfd>/<inoutfd> should be passed unmolested to
  13  * git-receive-pack/git-upload-pack/git-upload-archive and output of
  14  * git-receive-pack/git-upload-pack/git-upload-archive should be passed
  15  * unmolested to <infd>/<inoutfd>.
  16  *
  17  */
  18
  19 #define MAXCOMMAND 4096
  20
  21 static void command_loop(int input_fd, int output_fd)
  22 {
  23         char buffer[MAXCOMMAND];
  24
  25         while (1) {
  26                 size_t i;
  27                 if (!fgets(buffer, MAXCOMMAND - 1, stdin)) {
  28                         if (ferror(stdin))
  29                                 die("Input error");
  30                         return;
  31                 }
  32                 /* Strip end of line characters. */
  33                 i = strlen(buffer);
  34                 while (i > 0 && isspace(buffer[i - 1]))
  35                         buffer[--i] = 0;
  36
  37                 if (!strcmp(buffer, "capabilities")) {
  38                         printf("*connect\n\n");
  39                         fflush(stdout);
  40                 } else if (!strncmp(buffer, "connect ", 8)) {
  41                         printf("\n");
  42                         fflush(stdout);
  43                         if (bidirectional_transfer_loop(input_fd,
  44                                 output_fd))
  45                                 die("Copying data between file descriptors failed");
  46                         return;
  47                 } else {
  48                         die("Bad command: %s", buffer);
  49                 }
  50         }
  51 }
  52
  53 int cmd_remote_fd(int argc, const char **argv, const char *prefix)
  54 {
  55         int input_fd = -1;
  56         int output_fd = -1;
  57         char *end;
  58
  59         if (argc != 3)
  60                 die("Expected two arguments");
  61
  62         input_fd = (int)strtoul(argv[2], &end, 10);
  63
  64         if ((end == argv[2]) || (*end != ',' && *end != '/' && *end))
  65                 die("Bad URL syntax");
  66
  67         if (*end == '/' || !*end) {
  68                 output_fd = input_fd;
  69         } else {
  70                 char *end2;
  71                 output_fd = (int)strtoul(end + 1, &end2, 10);
  72
  73                 if ((end2 == end + 1) || (*end2 != '/' && *end2))
  74                         die("Bad URL syntax");
  75         }
  76
  77         command_loop(input_fd, output_fd);
  78         return 0;
  79 }