-#include <signal.h>
-#include <sys/wait.h>
-#include <sys/socket.h>
-#include <sys/time.h>
-#include <sys/poll.h>
-#include <netdb.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
-#include <syslog.h>
-#include "pkt-line.h"
#include "cache.h"
+#include "pkt-line.h"
#include "exec_cmd.h"
+#include <syslog.h>
+
+#ifndef HOST_NAME_MAX
+#define HOST_NAME_MAX 256
+#endif
+
+#ifndef NI_MAXSERV
+#define NI_MAXSERV 32
+#endif
+
static int log_syslog;
static int verbose;
+static int reuseaddr;
static const char daemon_usage[] =
-"git-daemon [--verbose] [--syslog] [--inetd | --port=n] [--export-all]\n"
-" [--timeout=n] [--init-timeout=n] [--strict-paths]\n"
-" [--base-path=path] [directory...]";
+"git daemon [--verbose] [--syslog] [--export-all]\n"
+" [--timeout=n] [--init-timeout=n] [--max-connections=n]\n"
+" [--strict-paths] [--base-path=path] [--base-path-relaxed]\n"
+" [--user-path | --user-path=path]\n"
+" [--interpolated-path=path]\n"
+" [--reuseaddr] [--detach] [--pid-file=file]\n"
+" [--[enable|disable|allow-override|forbid-override]=service]\n"
+" [--inetd | [--listen=host_or_ipaddr] [--port=n]\n"
+" [--user=user [--group=group]]\n"
+" [directory...]";
/* List of acceptable pathname prefixes */
-static char **ok_paths = NULL;
-static int strict_paths = 0;
+static char **ok_paths;
+static int strict_paths;
/* If this is set, git-daemon-export-ok is not required */
-static int export_all_trees = 0;
+static int export_all_trees;
/* Take all paths relative to this one if non-NULL */
-static char *base_path = NULL;
+static char *base_path;
+static char *interpolated_path;
+static int base_path_relaxed;
-/* Timeout, and initial timeout */
-static unsigned int timeout = 0;
-static unsigned int init_timeout = 0;
+/* Flag indicating client sent extra args. */
+static int saw_extended_args;
-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;
+/* If defined, ~user notation is allowed and the string is inserted
+ * after ~user/. E.g. a request to git://host/~alice/frotz would
+ * go to /home/alice/pub_git/frotz with --user-path=pub_git.
+ */
+static const char *user_path;
- /* sizeof(buf) should be big enough for "[pid] \n" */
- buflen = snprintf(buf, sizeof(buf), "[%ld] ", (long) getpid());
+/* Timeout, and initial timeout */
+static unsigned int timeout;
+static unsigned int init_timeout;
- maxlen = sizeof(buf) - buflen - 1; /* -1 for our own LF */
- msglen = vsnprintf(buf + buflen, maxlen, err, params);
+static char *hostname;
+static char *canon_hostname;
+static char *ip_address;
+static char *tcp_port;
+static void logreport(int priority, const char *err, va_list params)
+{
if (log_syslog) {
+ char buf[1024];
+ vsnprintf(buf, sizeof(buf), err, params);
syslog(priority, "%s", buf);
- return;
+ } else {
+ /*
+ * Since stderr is set to linebuffered mode, the
+ * logging of different processes will not overlap
+ */
+ fprintf(stderr, "[%"PRIuMAX"] ", (uintmax_t)getpid());
+ vfprintf(stderr, err, params);
+ fputc('\n', stderr);
}
-
- /* 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_end(params);
}
+static void NORETURN daemon_die(const char *err, va_list params)
+{
+ logreport(LOG_ERR, err, params);
+ exit(1);
+}
+
static int avoid_alias(char *p)
{
int sl, ndot;
- /*
+ /*
* This resurrects the belts and suspenders paranoia check by HPA
* done in <435560F7.4080006@zytor.com> thread, now enter_repo()
* does not do getcwd() based path canonicalizations.
}
}
-static char *path_ok(char *dir)
+static char *path_ok(char *directory)
{
+ static char rpath[PATH_MAX];
+ static char interp_path[PATH_MAX];
char *path;
+ char *dir;
+
+ dir = directory;
if (avoid_alias(dir)) {
logerror("'%s': aliased", dir);
return NULL;
}
- if (base_path) {
- static char rpath[PATH_MAX];
+ if (*dir == '~') {
+ if (!user_path) {
+ logerror("'%s': User-path not allowed", dir);
+ return NULL;
+ }
+ if (*user_path) {
+ /* Got either "~alice" or "~alice/foo";
+ * rewrite them to "~alice/%s" or
+ * "~alice/%s/foo".
+ */
+ int namlen, restlen = strlen(dir);
+ char *slash = strchr(dir, '/');
+ if (!slash)
+ slash = dir + restlen;
+ namlen = slash - dir;
+ restlen -= namlen;
+ loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash);
+ snprintf(rpath, PATH_MAX, "%.*s/%s%.*s",
+ namlen, dir, user_path, restlen, slash);
+ dir = rpath;
+ }
+ }
+ else if (interpolated_path && saw_extended_args) {
+ struct strbuf expanded_path = STRBUF_INIT;
+ struct strbuf_expand_dict_entry dict[] = {
+ { "H", hostname },
+ { "CH", canon_hostname },
+ { "IP", ip_address },
+ { "P", tcp_port },
+ { "D", directory },
+ { "%", "%" },
+ { NULL }
+ };
+
if (*dir != '/') {
- /* Forbid possible base-path evasion using ~paths. */
+ /* Allow only absolute */
+ logerror("'%s': Non-absolute path denied (interpolated-path active)", dir);
+ return NULL;
+ }
+
+ strbuf_expand(&expanded_path, interpolated_path,
+ strbuf_expand_dict_cb, &dict);
+ strlcpy(interp_path, expanded_path.buf, PATH_MAX);
+ strbuf_release(&expanded_path);
+ loginfo("Interpolated dir '%s'", interp_path);
+
+ dir = interp_path;
+ }
+ else if (base_path) {
+ if (*dir != '/') {
+ /* Allow only absolute */
logerror("'%s': Non-absolute path denied (base-path active)", dir);
return NULL;
}
}
path = enter_repo(dir, strict_paths);
+ if (!path && base_path && base_path_relaxed) {
+ /*
+ * if we fail and base_path_relaxed is enabled, try without
+ * prefixing the base path
+ */
+ dir = directory;
+ path = enter_repo(dir, strict_paths);
+ }
if (!path) {
logerror("'%s': unable to chdir or not a git archive", dir);
int pathlen = strlen(path);
/* The validation is done on the paths after enter_repo
- * appends optional {.git,.git/.git} and friends, but
+ * appends optional {.git,.git/.git} and friends, but
* it does not use getcwd(). So if your /pub is
* a symlink to /mnt/pub, you can whitelist /pub and
* do not have to say /mnt/pub.
return NULL; /* Fallthrough. Deny by default */
}
-static int upload(char *dir)
+typedef int (*daemon_service_fn)(void);
+struct daemon_service {
+ const char *name;
+ const char *config_name;
+ daemon_service_fn fn;
+ int enabled;
+ int overridable;
+};
+
+static struct daemon_service *service_looking_at;
+static int service_enabled;
+
+static int git_daemon_config(const char *var, const char *value, void *cb)
+{
+ if (!prefixcmp(var, "daemon.") &&
+ !strcmp(var + 7, service_looking_at->config_name)) {
+ service_enabled = git_config_bool(var, value);
+ return 0;
+ }
+
+ /* we are not interested in parsing any other configuration here */
+ return 0;
+}
+
+static int run_service(char *dir, struct daemon_service *service)
{
- /* Timeout as string */
- char timeout_buf[64];
const char *path;
+ int enabled = service->enabled;
- loginfo("Request for '%s'", dir);
+ loginfo("Request %s for '%s'", service->name, dir);
+
+ if (!enabled && !service->overridable) {
+ logerror("'%s': service not enabled.", service->name);
+ errno = EACCES;
+ return -1;
+ }
if (!(path = path_ok(dir)))
return -1;
return -1;
}
+ if (service->overridable) {
+ service_looking_at = service;
+ service_enabled = -1;
+ git_config(git_daemon_config, NULL);
+ if (0 <= service_enabled)
+ enabled = service_enabled;
+ }
+ if (!enabled) {
+ logerror("'%s': service not enabled for '%s'",
+ service->name, path);
+ errno = EACCES;
+ return -1;
+ }
+
/*
* We'll ignore SIGTERM from now on, we have a
* good client.
*/
signal(SIGTERM, SIG_IGN);
+ return service->fn();
+}
+
+static int upload_pack(void)
+{
+ /* Timeout as string */
+ char timeout_buf[64];
+
snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout);
/* git-upload-pack only ever reads stuff, so this is safe */
return -1;
}
-static int execute(void)
+static int upload_archive(void)
+{
+ execl_git_cmd("upload-archive", ".", NULL);
+ return -1;
+}
+
+static int receive_pack(void)
+{
+ execl_git_cmd("receive-pack", ".", NULL);
+ return -1;
+}
+
+static struct daemon_service daemon_service[] = {
+ { "upload-archive", "uploadarch", upload_archive, 0, 1 },
+ { "upload-pack", "uploadpack", upload_pack, 1, 1 },
+ { "receive-pack", "receivepack", receive_pack, 0, 1 },
+};
+
+static void enable_service(const char *name, int ena)
+{
+ int i;
+ for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
+ if (!strcmp(daemon_service[i].name, name)) {
+ daemon_service[i].enabled = ena;
+ return;
+ }
+ }
+ die("No such service %s", name);
+}
+
+static void make_service_overridable(const char *name, int ena)
+{
+ int i;
+ for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
+ if (!strcmp(daemon_service[i].name, name)) {
+ daemon_service[i].overridable = ena;
+ return;
+ }
+ }
+ die("No such service %s", name);
+}
+
+static char *xstrdup_tolower(const char *str)
+{
+ char *p, *dup = xstrdup(str);
+ for (p = dup; *p; p++)
+ *p = tolower(*p);
+ return dup;
+}
+
+/*
+ * Separate the "extra args" information as supplied by the client connection.
+ */
+static void parse_extra_args(char *extra_args, int buflen)
+{
+ char *val;
+ int vallen;
+ char *end = extra_args + buflen;
+
+ while (extra_args < end && *extra_args) {
+ saw_extended_args = 1;
+ if (strncasecmp("host=", extra_args, 5) == 0) {
+ val = extra_args + 5;
+ vallen = strlen(val) + 1;
+ if (*val) {
+ /* Split <host>:<port> at colon. */
+ char *host = val;
+ char *port = strrchr(host, ':');
+ if (port) {
+ *port = 0;
+ port++;
+ free(tcp_port);
+ tcp_port = xstrdup(port);
+ }
+ free(hostname);
+ hostname = xstrdup_tolower(host);
+ }
+
+ /* On to the next one */
+ extra_args = val + vallen;
+ }
+ }
+
+ /*
+ * Locate canonical hostname and its IP address.
+ */
+ if (hostname) {
+#ifndef NO_IPV6
+ struct addrinfo hints;
+ struct addrinfo *ai, *ai0;
+ int gai;
+ static char addrbuf[HOST_NAME_MAX + 1];
+
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_flags = AI_CANONNAME;
+
+ gai = getaddrinfo(hostname, 0, &hints, &ai0);
+ if (!gai) {
+ for (ai = ai0; ai; ai = ai->ai_next) {
+ struct sockaddr_in *sin_addr = (void *)ai->ai_addr;
+
+ inet_ntop(AF_INET, &sin_addr->sin_addr,
+ addrbuf, sizeof(addrbuf));
+ free(canon_hostname);
+ canon_hostname = xstrdup(ai->ai_canonname);
+ free(ip_address);
+ ip_address = xstrdup(addrbuf);
+ break;
+ }
+ freeaddrinfo(ai0);
+ }
+#else
+ struct hostent *hent;
+ struct sockaddr_in sa;
+ char **ap;
+ static char addrbuf[HOST_NAME_MAX + 1];
+
+ hent = gethostbyname(hostname);
+
+ ap = hent->h_addr_list;
+ memset(&sa, 0, sizeof sa);
+ sa.sin_family = hent->h_addrtype;
+ sa.sin_port = htons(0);
+ memcpy(&sa.sin_addr, *ap, hent->h_length);
+
+ inet_ntop(hent->h_addrtype, &sa.sin_addr,
+ addrbuf, sizeof(addrbuf));
+
+ free(canon_hostname);
+ canon_hostname = xstrdup(hent->h_name);
+ free(ip_address);
+ ip_address = xstrdup(addrbuf);
+#endif
+ }
+}
+
+
+static int execute(struct sockaddr *addr)
{
static char line[1000];
- int len;
+ int pktlen, len, i;
+
+ if (addr) {
+ char addrbuf[256] = "";
+ int port = -1;
+
+ if (addr->sa_family == AF_INET) {
+ struct sockaddr_in *sin_addr = (void *) addr;
+ inet_ntop(addr->sa_family, &sin_addr->sin_addr, addrbuf, sizeof(addrbuf));
+ port = ntohs(sin_addr->sin_port);
+#ifndef NO_IPV6
+ } else if (addr && 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 = ntohs(sin6_addr->sin6_port);
+#endif
+ }
+ loginfo("Connection from %s:%d", addrbuf, port);
+ setenv("REMOTE_ADDR", addrbuf, 1);
+ }
+ else {
+ unsetenv("REMOTE_ADDR");
+ }
alarm(init_timeout ? init_timeout : timeout);
- len = packet_read_line(0, line, sizeof(line));
+ pktlen = packet_read_line(0, line, sizeof(line));
alarm(0);
- if (len && line[len-1] == '\n')
+ len = strlen(line);
+ if (pktlen != len)
+ loginfo("Extended attributes (%d bytes) exist <%.*s>",
+ (int) pktlen - len,
+ (int) pktlen - len, line + len + 1);
+ if (len && line[len-1] == '\n') {
line[--len] = 0;
+ pktlen--;
+ }
- if (!strncmp("git-upload-pack ", line, 16))
- return upload(line+16);
+ free(hostname);
+ free(canon_hostname);
+ free(ip_address);
+ free(tcp_port);
+ hostname = canon_hostname = ip_address = tcp_port = NULL;
+
+ if (len != pktlen)
+ parse_extra_args(line + len + 1, pktlen - len - 1);
+
+ for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
+ struct daemon_service *s = &(daemon_service[i]);
+ int namelen = strlen(s->name);
+ if (!prefixcmp(line, "git-") &&
+ !strncmp(s->name, line + 4, namelen) &&
+ line[namelen + 4] == ' ') {
+ /*
+ * Note: The directory here is probably context sensitive,
+ * and might depend on the actual service being performed.
+ */
+ return run_service(line + namelen + 5, s);
+ }
+ }
logerror("Protocol error: '%s'", line);
return -1;
}
+static int max_connections = 32;
-/*
- * We count spawned/reaped separately, just to avoid any
- * races when updating them from signals. The SIGCHLD handler
- * will only update children_reaped, and the fork logic will
- * only update children_spawned.
- *
- * MAX_CHILDREN should be a power-of-two to make the modulus
- * operation cheap. It should also be at least twice
- * the maximum number of connections we will ever allow.
- */
-#define MAX_CHILDREN 128
-
-static int max_connections = 25;
-
-/* These are updated by the signal handler */
-static volatile unsigned int children_reaped = 0;
-static pid_t dead_child[MAX_CHILDREN];
-
-/* These are updated by the main loop */
-static unsigned int children_spawned = 0;
-static unsigned int children_deleted = 0;
+static unsigned int live_children;
static struct child {
+ struct child *next;
pid_t pid;
- int addrlen;
struct sockaddr_storage address;
-} live_child[MAX_CHILDREN];
+} *firstborn;
-static void add_child(int idx, pid_t pid, struct sockaddr *addr, int addrlen)
+static void add_child(pid_t pid, struct sockaddr *addr, int addrlen)
{
- live_child[idx].pid = pid;
- live_child[idx].addrlen = addrlen;
- memcpy(&live_child[idx].address, addr, addrlen);
+ struct child *newborn, **cradle;
+
+ /*
+ * This must be xcalloc() -- we'll compare the whole sockaddr_storage
+ * but individual address may be shorter.
+ */
+ newborn = xcalloc(1, sizeof(*newborn));
+ live_children++;
+ newborn->pid = pid;
+ memcpy(&newborn->address, addr, addrlen);
+ for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next)
+ if (!memcmp(&(*cradle)->address, &newborn->address,
+ sizeof(newborn->address)))
+ break;
+ newborn->next = *cradle;
+ *cradle = newborn;
}
-/*
- * Walk from "deleted" to "spawned", and remove child "pid".
- *
- * We move everything up by one, since the new "deleted" will
- * be one higher.
- */
-static void remove_child(pid_t pid, unsigned deleted, unsigned spawned)
+static void remove_child(pid_t pid)
{
- struct child n;
+ struct child **cradle, *blanket;
- deleted %= MAX_CHILDREN;
- spawned %= MAX_CHILDREN;
- if (live_child[deleted].pid == pid) {
- live_child[deleted].pid = -1;
- return;
- }
- n = live_child[deleted];
- for (;;) {
- struct child m;
- deleted = (deleted + 1) % MAX_CHILDREN;
- if (deleted == spawned)
- die("could not find dead child %d\n", pid);
- m = live_child[deleted];
- live_child[deleted] = n;
- if (m.pid == pid)
- return;
- n = m;
- }
+ for (cradle = &firstborn; (blanket = *cradle); cradle = &blanket->next)
+ if (blanket->pid == pid) {
+ *cradle = blanket->next;
+ live_children--;
+ free(blanket);
+ break;
+ }
}
/*
* This gets called if the number of connections grows
* past "max_connections".
*
- * We _should_ start off by searching for connections
- * from the same IP, and if there is some address wth
- * multiple connections, we should kill that first.
- *
- * As it is, we just "randomly" kill 25% of the connections,
- * and our pseudo-random generator sucks too. I have no
- * shame.
- *
- * Really, this is just a place-holder for a _real_ algorithm.
+ * We kill the newest connection from a duplicate IP.
*/
-static void kill_some_children(int signo, unsigned start, unsigned stop)
-{
- start %= MAX_CHILDREN;
- stop %= MAX_CHILDREN;
- while (start != stop) {
- if (!(start & 3))
- kill(live_child[start].pid, signo);
- start = (start + 1) % MAX_CHILDREN;
- }
-}
-
-static void check_max_connections(void)
+static void kill_some_child(void)
{
- for (;;) {
- int active;
- unsigned spawned, reaped, deleted;
+ const struct child *blanket, *next;
- spawned = children_spawned;
- reaped = children_reaped;
- deleted = children_deleted;
-
- while (deleted < reaped) {
- pid_t pid = dead_child[deleted % MAX_CHILDREN];
- remove_child(pid, deleted, spawned);
- deleted++;
- }
- children_deleted = deleted;
+ if (!(blanket = firstborn))
+ return;
- active = spawned - deleted;
- if (active <= max_connections)
+ for (; (next = blanket->next); blanket = next)
+ if (!memcmp(&blanket->address, &next->address,
+ sizeof(next->address))) {
+ kill(blanket->pid, SIGTERM);
break;
+ }
+}
- /* Kill some unstarted connections with SIGTERM */
- kill_some_children(SIGTERM, deleted, spawned);
- if (active <= max_connections << 1)
- break;
+static void check_dead_children(void)
+{
+ int status;
+ pid_t pid;
- /* If the SIGTERM thing isn't helping use SIGKILL */
- kill_some_children(SIGKILL, deleted, spawned);
- sleep(1);
+ while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
+ const char *dead = "";
+ remove_child(pid);
+ if (!WIFEXITED(status) || (WEXITSTATUS(status) > 0))
+ dead = " (with error)";
+ loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead);
}
}
static void handle(int incoming, struct sockaddr *addr, int addrlen)
{
- pid_t pid = fork();
- char addrbuf[256] = "";
- int port = -1;
+ pid_t pid;
- if (pid) {
- unsigned idx;
+ if (max_connections && live_children >= max_connections) {
+ kill_some_child();
+ sleep(1); /* give it some time to die */
+ check_dead_children();
+ if (live_children >= max_connections) {
+ close(incoming);
+ logerror("Too many children, dropping connection");
+ return;
+ }
+ }
+ if ((pid = fork())) {
close(incoming);
- if (pid < 0)
+ if (pid < 0) {
+ logerror("Couldn't fork %s", strerror(errno));
return;
+ }
- idx = children_spawned % MAX_CHILDREN;
- children_spawned++;
- add_child(idx, pid, addr, addrlen);
-
- check_max_connections();
+ add_child(pid, addr, addrlen);
return;
}
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;
-
-#ifndef NO_IPV6
- } 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;
-#endif
- }
- loginfo("Connection from %s:%d", addrbuf, port);
-
- exit(execute());
+ exit(execute(addr));
}
static void child_handler(int signo)
{
- for (;;) {
- 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;
- }
+ /*
+ * Otherwise empty handler because systemcalls will get interrupted
+ * upon signal receipt
+ * SysV needs the handler to be rearmed
+ */
+ signal(SIGCHLD, child_handler);
+}
+
+static int set_reuse_addr(int sockfd)
+{
+ int on = 1;
+
+ if (!reuseaddr)
+ return 0;
+ return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
+ &on, sizeof(on));
}
#ifndef NO_IPV6
-static int socksetup(int port, int **socklist_p)
+static int socksetup(char *listen_addr, int listen_port, int **socklist_p)
{
int socknum = 0, *socklist = NULL;
int maxfd = -1;
char pbuf[NI_MAXSERV];
-
struct addrinfo hints, *ai0, *ai;
int gai;
+ long flags;
- sprintf(pbuf, "%d", port);
+ sprintf(pbuf, "%d", listen_port);
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
hints.ai_flags = AI_PASSIVE;
- gai = getaddrinfo(NULL, pbuf, &hints, &ai0);
+ gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0);
if (gai)
- die("getaddrinfo() failed: %s\n", gai_strerror(gai));
+ die("getaddrinfo() failed: %s", gai_strerror(gai));
for (ai = ai0; ai; ai = ai->ai_next) {
int sockfd;
- int *newlist;
sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (sockfd < 0)
continue;
if (sockfd >= FD_SETSIZE) {
- error("too large socket descriptor.");
+ logerror("Socket descriptor too large");
close(sockfd);
continue;
}
}
#endif
+ if (set_reuse_addr(sockfd)) {
+ close(sockfd);
+ continue;
+ }
+
if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
close(sockfd);
continue; /* not fatal */
continue; /* not fatal */
}
- newlist = realloc(socklist, sizeof(int) * (socknum + 1));
- if (!newlist)
- die("memory allocation failed: %s", strerror(errno));
+ flags = fcntl(sockfd, F_GETFD, 0);
+ if (flags >= 0)
+ fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
- socklist = newlist;
+ socklist = xrealloc(socklist, sizeof(int) * (socknum + 1));
socklist[socknum++] = sockfd;
if (maxfd < sockfd)
#else /* NO_IPV6 */
-static int socksetup(int port, int **socklist_p)
+static int socksetup(char *listen_addr, int listen_port, int **socklist_p)
{
struct sockaddr_in sin;
int sockfd;
+ long flags;
+
+ memset(&sin, 0, sizeof sin);
+ sin.sin_family = AF_INET;
+ sin.sin_port = htons(listen_port);
+
+ if (listen_addr) {
+ /* Well, host better be an IP address here. */
+ if (inet_pton(AF_INET, listen_addr, &sin.sin_addr.s_addr) <= 0)
+ return 0;
+ } else {
+ sin.sin_addr.s_addr = htonl(INADDR_ANY);
+ }
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
return 0;
- memset(&sin, 0, sizeof sin);
- sin.sin_family = AF_INET;
- sin.sin_addr.s_addr = htonl(INADDR_ANY);
- sin.sin_port = htons(port);
+ if (set_reuse_addr(sockfd)) {
+ close(sockfd);
+ return 0;
+ }
if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
close(sockfd);
return 0;
}
+ flags = fcntl(sockfd, F_GETFD, 0);
+ if (flags >= 0)
+ fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
+
*socklist_p = xmalloc(sizeof(int));
**socklist_p = sockfd;
return 1;
for (;;) {
int i;
+ check_dead_children();
+
if (poll(pfd, socknum, -1) < 0) {
if (errno != EINTR) {
- error("poll failed, resuming: %s",
+ logerror("Poll failed, resuming: %s",
strerror(errno));
sleep(1);
}
}
}
-static int serve(int port)
+/* if any standard file descriptor is missing open it to /dev/null */
+static void sanitize_stdfds(void)
+{
+ int fd = open("/dev/null", O_RDWR, 0);
+ while (fd != -1 && fd < 2)
+ fd = dup(fd);
+ if (fd == -1)
+ die("open /dev/null or dup failed: %s", strerror(errno));
+ if (fd > 2)
+ close(fd);
+}
+
+static void daemonize(void)
+{
+ switch (fork()) {
+ case 0:
+ break;
+ case -1:
+ die("fork failed: %s", strerror(errno));
+ default:
+ exit(0);
+ }
+ if (setsid() == -1)
+ die("setsid failed: %s", strerror(errno));
+ close(0);
+ close(1);
+ close(2);
+ sanitize_stdfds();
+}
+
+static void store_pid(const char *path)
+{
+ FILE *f = fopen(path, "w");
+ if (!f)
+ die("cannot open pid file %s: %s", path, strerror(errno));
+ if (fprintf(f, "%"PRIuMAX"\n", (uintmax_t) getpid()) < 0 || fclose(f) != 0)
+ die("failed to write pid file %s: %s", path, strerror(errno));
+}
+
+static int serve(char *listen_addr, int listen_port, struct passwd *pass, gid_t gid)
{
int socknum, *socklist;
- socknum = socksetup(port, &socklist);
+ socknum = socksetup(listen_addr, listen_port, &socklist);
if (socknum == 0)
- die("unable to allocate any listen sockets on port %u", port);
+ die("unable to allocate any listen sockets on host %s port %u",
+ listen_addr, listen_port);
+
+ if (pass && gid &&
+ (initgroups(pass->pw_name, gid) || setgid (gid) ||
+ setuid(pass->pw_uid)))
+ die("cannot drop privileges");
return service_loop(socknum, socklist);
}
int main(int argc, char **argv)
{
- int port = DEFAULT_GIT_PORT;
+ int listen_port = 0;
+ char *listen_addr = NULL;
int inetd_mode = 0;
+ const char *pid_file = NULL, *user_name = NULL, *group_name = NULL;
+ int detach = 0;
+ struct passwd *pass = NULL;
+ struct group *group;
+ gid_t gid = 0;
int i;
+ git_extract_argv0_path(argv[0]);
+
for (i = 1; i < argc; i++) {
char *arg = argv[i];
- if (!strncmp(arg, "--port=", 7)) {
+ if (!prefixcmp(arg, "--listen=")) {
+ listen_addr = xstrdup_tolower(arg + 9);
+ continue;
+ }
+ if (!prefixcmp(arg, "--port=")) {
char *end;
unsigned long n;
n = strtoul(arg+7, &end, 0);
if (arg[7] && !*end) {
- port = n;
+ listen_port = n;
continue;
}
}
export_all_trees = 1;
continue;
}
- if (!strncmp(arg, "--timeout=", 10)) {
+ if (!prefixcmp(arg, "--timeout=")) {
timeout = atoi(arg+10);
continue;
}
- if (!strncmp(arg, "--init-timeout=", 15)) {
+ if (!prefixcmp(arg, "--init-timeout=")) {
init_timeout = atoi(arg+15);
continue;
}
+ if (!prefixcmp(arg, "--max-connections=")) {
+ max_connections = atoi(arg+18);
+ if (max_connections < 0)
+ max_connections = 0; /* unlimited */
+ continue;
+ }
if (!strcmp(arg, "--strict-paths")) {
strict_paths = 1;
continue;
}
- if (!strncmp(arg, "--base-path=", 12)) {
+ if (!prefixcmp(arg, "--base-path=")) {
base_path = arg+12;
continue;
}
+ if (!strcmp(arg, "--base-path-relaxed")) {
+ base_path_relaxed = 1;
+ continue;
+ }
+ if (!prefixcmp(arg, "--interpolated-path=")) {
+ interpolated_path = arg+20;
+ continue;
+ }
+ if (!strcmp(arg, "--reuseaddr")) {
+ reuseaddr = 1;
+ continue;
+ }
+ if (!strcmp(arg, "--user-path")) {
+ user_path = "";
+ continue;
+ }
+ if (!prefixcmp(arg, "--user-path=")) {
+ user_path = arg + 12;
+ continue;
+ }
+ if (!prefixcmp(arg, "--pid-file=")) {
+ pid_file = arg + 11;
+ continue;
+ }
+ if (!strcmp(arg, "--detach")) {
+ detach = 1;
+ log_syslog = 1;
+ continue;
+ }
+ if (!prefixcmp(arg, "--user=")) {
+ user_name = arg + 7;
+ continue;
+ }
+ if (!prefixcmp(arg, "--group=")) {
+ group_name = arg + 8;
+ continue;
+ }
+ if (!prefixcmp(arg, "--enable=")) {
+ enable_service(arg + 9, 1);
+ continue;
+ }
+ if (!prefixcmp(arg, "--disable=")) {
+ enable_service(arg + 10, 0);
+ continue;
+ }
+ if (!prefixcmp(arg, "--allow-override=")) {
+ make_service_overridable(arg + 17, 1);
+ continue;
+ }
+ if (!prefixcmp(arg, "--forbid-override=")) {
+ make_service_overridable(arg + 18, 0);
+ continue;
+ }
if (!strcmp(arg, "--")) {
ok_paths = &argv[i+1];
break;
usage(daemon_usage);
}
- if (log_syslog)
- openlog("git-daemon", 0, LOG_DAEMON);
+ if (log_syslog) {
+ openlog("git-daemon", LOG_PID, LOG_DAEMON);
+ set_die_routine(daemon_die);
+ } else
+ /* avoid splitting a message in the middle */
+ setvbuf(stderr, NULL, _IOLBF, 0);
+
+ if (inetd_mode && (group_name || user_name))
+ die("--user and --group are incompatible with --inetd");
+
+ if (inetd_mode && (listen_port || listen_addr))
+ die("--listen= and --port= are incompatible with --inetd");
+ else if (listen_port == 0)
+ listen_port = DEFAULT_GIT_PORT;
+
+ if (group_name && !user_name)
+ die("--group supplied without --user");
+
+ if (user_name) {
+ pass = getpwnam(user_name);
+ if (!pass)
+ die("user not found - %s", user_name);
+
+ if (!group_name)
+ gid = pass->pw_gid;
+ else {
+ group = getgrnam(group_name);
+ if (!group)
+ die("group not found - %s", group_name);
+
+ gid = group->gr_gid;
+ }
+ }
+
+ if (strict_paths && (!ok_paths || !*ok_paths))
+ die("option --strict-paths requires a whitelist");
+
+ if (base_path && !is_directory(base_path))
+ die("base-path '%s' does not exist or is not a directory",
+ base_path);
+
+ if (inetd_mode) {
+ struct sockaddr_storage ss;
+ struct sockaddr *peer = (struct sockaddr *)&ss;
+ socklen_t slen = sizeof(ss);
+
+ if (!freopen("/dev/null", "w", stderr))
+ die("failed to redirect stderr to /dev/null: %s",
+ strerror(errno));
- if (strict_paths && (!ok_paths || !*ok_paths)) {
- if (!inetd_mode)
- die("git-daemon: option --strict-paths requires a whitelist");
+ if (getpeername(0, peer, &slen))
+ peer = NULL;
- logerror("option --strict-paths requires a whitelist");
- exit (1);
+ return execute(peer);
}
- if (inetd_mode) {
- fclose(stderr); //FIXME: workaround
- return execute();
+ if (detach) {
+ daemonize();
+ loginfo("Ready to rumble");
}
+ else
+ sanitize_stdfds();
+
+ if (pid_file)
+ store_pid(pid_file);
- return serve(port);
+ return serve(listen_addr, listen_port, pass, gid);
}