Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
tag: v1.8.1-rc0
Fetching contributors…

Octocat-spinner-32-eaf2f5

Cannot retrieve contributors at this time

file 123 lines (103 sloc) 2.421 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122
#include "cache.h"
#include "unix-socket.h"

static int unix_stream_socket(void)
{
int fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd < 0)
die_errno("unable to create socket");
return fd;
}

static int chdir_len(const char *orig, int len)
{
char *path = xmemdupz(orig, len);
int r = chdir(path);
free(path);
return r;
}

struct unix_sockaddr_context {
char orig_dir[PATH_MAX];
};

static void unix_sockaddr_cleanup(struct unix_sockaddr_context *ctx)
{
if (!ctx->orig_dir[0])
return;
/*
* If we fail, we can't just return an error, since we have
* moved the cwd of the whole process, which could confuse calling
* code. We are better off to just die.
*/
if (chdir(ctx->orig_dir) < 0)
die("unable to restore original working directory");
}

static int unix_sockaddr_init(struct sockaddr_un *sa, const char *path,
struct unix_sockaddr_context *ctx)
{
int size = strlen(path) + 1;

ctx->orig_dir[0] = '\0';
if (size > sizeof(sa->sun_path)) {
const char *slash = find_last_dir_sep(path);
const char *dir;

if (!slash) {
errno = ENAMETOOLONG;
return -1;
}

dir = path;
path = slash + 1;
size = strlen(path) + 1;
if (size > sizeof(sa->sun_path)) {
errno = ENAMETOOLONG;
return -1;
}

if (!getcwd(ctx->orig_dir, sizeof(ctx->orig_dir))) {
errno = ENAMETOOLONG;
return -1;
}
if (chdir_len(dir, slash - dir) < 0)
return -1;
}

memset(sa, 0, sizeof(*sa));
sa->sun_family = AF_UNIX;
memcpy(sa->sun_path, path, size);
return 0;
}

int unix_stream_connect(const char *path)
{
int fd, saved_errno;
struct sockaddr_un sa;
struct unix_sockaddr_context ctx;

if (unix_sockaddr_init(&sa, path, &ctx) < 0)
return -1;
fd = unix_stream_socket();
if (connect(fd, (struct sockaddr *)&sa, sizeof(sa)) < 0)
goto fail;
unix_sockaddr_cleanup(&ctx);
return fd;

fail:
saved_errno = errno;
unix_sockaddr_cleanup(&ctx);
close(fd);
errno = saved_errno;
return -1;
}

int unix_stream_listen(const char *path)
{
int fd, saved_errno;
struct sockaddr_un sa;
struct unix_sockaddr_context ctx;

if (unix_sockaddr_init(&sa, path, &ctx) < 0)
return -1;
fd = unix_stream_socket();

unlink(path);
if (bind(fd, (struct sockaddr *)&sa, sizeof(sa)) < 0)
goto fail;

if (listen(fd, 5) < 0)
goto fail;

unix_sockaddr_cleanup(&ctx);
return fd;

fail:
saved_errno = errno;
unix_sockaddr_cleanup(&ctx);
close(fd);
errno = saved_errno;
return -1;
}
Something went wrong with that request. Please try again.