f655651e09
Reduce the use of fixed sized buffer passed to getcwd() calls by introducing xgetcwd() helper. * rs/strbuf-getcwd: use strbuf_add_absolute_path() to add absolute paths abspath: convert absolute_path() to strbuf use xgetcwd() to set $GIT_DIR use xgetcwd() to get the current directory or die wrapper: add xgetcwd() abspath: convert real_path_internal() to strbuf abspath: use strbuf_getcwd() to remember original working directory setup: convert setup_git_directory_gently_1 et al. to strbuf unix-sockets: use strbuf_getcwd() strbuf: add strbuf_getcwd()
124 lines
2.4 KiB
C
124 lines
2.4 KiB
C
#include "cache.h"
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#include "unix-socket.h"
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static int unix_stream_socket(void)
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{
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int fd = socket(AF_UNIX, SOCK_STREAM, 0);
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if (fd < 0)
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die_errno("unable to create socket");
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return fd;
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}
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static int chdir_len(const char *orig, int len)
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{
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char *path = xmemdupz(orig, len);
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int r = chdir(path);
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free(path);
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return r;
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}
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struct unix_sockaddr_context {
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char *orig_dir;
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};
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static void unix_sockaddr_cleanup(struct unix_sockaddr_context *ctx)
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{
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if (!ctx->orig_dir)
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return;
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/*
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* If we fail, we can't just return an error, since we have
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* moved the cwd of the whole process, which could confuse calling
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* code. We are better off to just die.
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*/
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if (chdir(ctx->orig_dir) < 0)
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die("unable to restore original working directory");
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free(ctx->orig_dir);
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}
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static int unix_sockaddr_init(struct sockaddr_un *sa, const char *path,
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struct unix_sockaddr_context *ctx)
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{
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int size = strlen(path) + 1;
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ctx->orig_dir = NULL;
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if (size > sizeof(sa->sun_path)) {
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const char *slash = find_last_dir_sep(path);
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const char *dir;
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struct strbuf cwd = STRBUF_INIT;
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if (!slash) {
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errno = ENAMETOOLONG;
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return -1;
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}
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dir = path;
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path = slash + 1;
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size = strlen(path) + 1;
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if (size > sizeof(sa->sun_path)) {
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errno = ENAMETOOLONG;
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return -1;
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}
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if (strbuf_getcwd(&cwd))
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return -1;
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ctx->orig_dir = strbuf_detach(&cwd, NULL);
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if (chdir_len(dir, slash - dir) < 0)
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return -1;
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}
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memset(sa, 0, sizeof(*sa));
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sa->sun_family = AF_UNIX;
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memcpy(sa->sun_path, path, size);
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return 0;
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}
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int unix_stream_connect(const char *path)
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{
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int fd, saved_errno;
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struct sockaddr_un sa;
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struct unix_sockaddr_context ctx;
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if (unix_sockaddr_init(&sa, path, &ctx) < 0)
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return -1;
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fd = unix_stream_socket();
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if (connect(fd, (struct sockaddr *)&sa, sizeof(sa)) < 0)
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goto fail;
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unix_sockaddr_cleanup(&ctx);
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return fd;
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fail:
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saved_errno = errno;
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unix_sockaddr_cleanup(&ctx);
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close(fd);
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errno = saved_errno;
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return -1;
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}
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int unix_stream_listen(const char *path)
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{
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int fd, saved_errno;
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struct sockaddr_un sa;
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struct unix_sockaddr_context ctx;
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unlink(path);
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if (unix_sockaddr_init(&sa, path, &ctx) < 0)
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return -1;
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fd = unix_stream_socket();
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if (bind(fd, (struct sockaddr *)&sa, sizeof(sa)) < 0)
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goto fail;
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if (listen(fd, 5) < 0)
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goto fail;
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unix_sockaddr_cleanup(&ctx);
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return fd;
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fail:
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saved_errno = errno;
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unix_sockaddr_cleanup(&ctx);
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close(fd);
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errno = saved_errno;
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return -1;
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}
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