#include <signal.h>
#include <sys/wait.h>
#include <sys/socket.h>
+#include <sys/time.h>
#include <netdb.h>
#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <syslog.h>
-static const char daemon_usage[] = "git-daemon [--inetd | --port=n]";
+static int log_syslog;
+static int verbose;
+
+static const char daemon_usage[] = "git-daemon [--verbose] [--syslog] [--inetd | --port=n] [--export-all] [directory...]";
+
+/* List of acceptable pathname prefixes */
+static char **ok_paths = NULL;
+
+/* If this is set, git-daemon-export-ok is not required */
+static int export_all_trees = 0;
+
+
+static void logreport(int priority, const char *err, va_list params)
+{
+ /* We should do a single write so that it is atomic and output
+ * of several processes do not get intermingled. */
+ char buf[1024];
+ int buflen;
+ int maxlen, msglen;
+
+ /* sizeof(buf) should be big enough for "[pid] \n" */
+ buflen = snprintf(buf, sizeof(buf), "[%ld] ", (long) getpid());
+
+ maxlen = sizeof(buf) - buflen - 1; /* -1 for our own LF */
+ msglen = vsnprintf(buf + buflen, maxlen, err, params);
+
+ if (log_syslog) {
+ syslog(priority, "%s", buf);
+ return;
+ }
+
+ /* maxlen counted our own LF but also counts space given to
+ * vsnprintf for the terminating NUL. We want to make sure that
+ * we have space for our own LF and NUL after the "meat" of the
+ * message, so truncate it at maxlen - 1.
+ */
+ if (msglen > maxlen - 1)
+ msglen = maxlen - 1;
+ else if (msglen < 0)
+ msglen = 0; /* Protect against weird return values. */
+ buflen += msglen;
+
+ buf[buflen++] = '\n';
+ buf[buflen] = '\0';
+
+ write(2, buf, buflen);
+}
+
+static void logerror(const char *err, ...)
+{
+ va_list params;
+ va_start(params, err);
+ logreport(LOG_ERR, err, params);
+ va_end(params);
+}
+
+static void loginfo(const char *err, ...)
+{
+ va_list params;
+ if (!verbose)
+ return;
+ va_start(params, err);
+ logreport(LOG_INFO, err, params);
+ va_end(params);
+}
+
+static int path_ok(const char *dir)
+{
+ const char *p = dir;
+ char **pp;
+ int sl = 1, ndot = 0;
+
+ for (;;) {
+ if ( *p == '.' ) {
+ ndot++;
+ } else if ( *p == '/' || *p == '\0' ) {
+ if ( sl && ndot > 0 && ndot < 3 )
+ return 0; /* . or .. in path */
+ sl = 1;
+ if ( *p == '\0' )
+ break; /* End of string and all is good */
+ } else {
+ sl = ndot = 0;
+ }
+ p++;
+ }
+
+ if ( ok_paths && *ok_paths ) {
+ int ok = 0;
+ int dirlen = strlen(dir); /* read_packet_line can return embedded \0 */
+
+ for ( pp = ok_paths ; *pp ; pp++ ) {
+ int len = strlen(*pp);
+ if ( len <= dirlen &&
+ !strncmp(*pp, dir, len) &&
+ (dir[len] == '/' || dir[len] == '\0') ) {
+ ok = 1;
+ break;
+ }
+ }
+
+ if ( !ok )
+ return 0; /* Path not in whitelist */
+ }
+
+ return 1; /* Path acceptable */
+}
static int upload(char *dir, int dirlen)
{
- if (chdir(dir) < 0)
+ loginfo("Request for '%s'", dir);
+
+ if (!path_ok(dir)) {
+ logerror("Forbidden directory: %s\n", dir);
return -1;
+ }
+
+ if (chdir(dir) < 0) {
+ logerror("Cannot chdir('%s'): %s", dir, strerror(errno));
+ return -1;
+ }
+
chdir(".git");
/*
* a "git-daemon-export-ok" flag that says that the other side
* is ok with us doing this.
*/
- if (access("git-daemon-export-ok", F_OK) ||
+ if ((!export_all_trees && access("git-daemon-export-ok", F_OK)) ||
access("objects/00", X_OK) ||
- access("HEAD", R_OK))
+ access("HEAD", R_OK)) {
+ logerror("Not a valid git-daemon-enabled repository: '%s'", dir);
return -1;
+ }
/*
* We'll ignore SIGTERM from now on, we have a
if (!strncmp("git-upload-pack /", line, 17))
return upload(line + 16, len - 16);
- fprintf(stderr, "got bad connection '%s'\n", line);
+ logerror("Protocol error: '%s'", line);
return -1;
}
static struct child {
pid_t pid;
- socklen_t addrlen;
+ int addrlen;
struct sockaddr_storage address;
} live_child[MAX_CHILDREN];
-static void add_child(int idx, pid_t pid, struct sockaddr *addr, socklen_t addrlen)
+static void add_child(int idx, pid_t pid, struct sockaddr *addr, int addrlen)
{
live_child[idx].pid = pid;
live_child[idx].addrlen = addrlen;
}
}
-static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen)
+static void handle(int incoming, struct sockaddr *addr, int addrlen)
{
pid_t pid = fork();
+ char addrbuf[256] = "";
+ int port = -1;
if (pid) {
unsigned idx;
dup2(incoming, 0);
dup2(incoming, 1);
close(incoming);
+
+ if (addr->sa_family == AF_INET) {
+ struct sockaddr_in *sin_addr = (void *) addr;
+ inet_ntop(AF_INET, &sin_addr->sin_addr, addrbuf, sizeof(addrbuf));
+ port = sin_addr->sin_port;
+
+ } else if (addr->sa_family == AF_INET6) {
+ struct sockaddr_in6 *sin6_addr = (void *) addr;
+
+ char *buf = addrbuf;
+ *buf++ = '['; *buf = '\0'; /* stpcpy() is cool */
+ inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(addrbuf) - 1);
+ strcat(buf, "]");
+
+ port = sin6_addr->sin6_port;
+ }
+ loginfo("Connection from %s:%d", addrbuf, port);
+
exit(execute());
}
static void child_handler(int signo)
{
for (;;) {
- pid_t pid = waitpid(-1, NULL, WNOHANG);
+ int status;
+ pid_t pid = waitpid(-1, &status, WNOHANG);
if (pid > 0) {
unsigned reaped = children_reaped;
dead_child[reaped % MAX_CHILDREN] = pid;
children_reaped = reaped + 1;
+ /* XXX: Custom logging, since we don't wanna getpid() */
+ if (verbose) {
+ char *dead = "";
+ if (!WIFEXITED(status) || WEXITSTATUS(status) > 0)
+ dead = " (with error)";
+ if (log_syslog)
+ syslog(LOG_INFO, "[%d] Disconnected%s", pid, dead);
+ else
+ fprintf(stderr, "[%d] Disconnected%s\n", pid, dead);
+ }
continue;
}
break;
if (FD_ISSET(sockfd, &fds)) {
struct sockaddr_storage ss;
- socklen_t sslen = sizeof(ss);
+ int sslen = sizeof(ss);
int incoming = accept(sockfd, (struct sockaddr *)&ss, &sslen);
if (incoming < 0) {
switch (errno) {
continue;
}
}
-
if (!strcmp(arg, "--inetd")) {
inetd_mode = 1;
continue;
}
+ if (!strcmp(arg, "--verbose")) {
+ verbose = 1;
+ continue;
+ }
+ if (!strcmp(arg, "--syslog")) {
+ log_syslog = 1;
+ openlog("git-daemon", 0, LOG_DAEMON);
+ continue;
+ }
+ if (!strcmp(arg, "--export-all")) {
+ export_all_trees = 1;
+ continue;
+ }
+ if (!strcmp(arg, "--")) {
+ ok_paths = &argv[i+1];
+ break;
+ } else if (arg[0] != '-') {
+ ok_paths = &argv[i];
+ break;
+ }
usage(daemon_usage);
}
- if (inetd_mode)
+ if (inetd_mode) {
+ fclose(stderr); //FIXME: workaround
return execute();
+ }
return serve(port);
}