Cleaned up git-daemon virtual hosting support.

Standardized on lowercase hostnames from client.

Added interpolation values for the IP address, port and
canonical hostname of the server as it is contacted and
named by the client and passed in via the extended args.

Added --listen=host_or_ipaddr option suport.  Renamed port
variable as "listen_port" correspondingly as well.

Documented mutual exclusivity of --inetd option with
    --user, --group, --listen and --port options.

Added compat/inet_pton.c from Paul Vixie as needed.

Small memory leaks need to be cleaned up still.

Signed-off-by: Jon Loeliger <jdl@jdl.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 129 insertions, 22 deletions

diff --git a/daemon.c b/daemon.c
index eb4f3f1e9f..69ea35c22d 100644
--- a/daemon.c
+++ b/daemon.c
@@ -9,6 +9,7 @@
 #include <syslog.h>
 #include <pwd.h>
 #include <grp.h>
+#include <limits.h>
 #include "pkt-line.h"
 #include "cache.h"
 #include "exec_cmd.h"
@@ -19,13 +20,15 @@ static int verbose;
 static int reuseaddr;
 
 static const char daemon_usage[] =
-"git-daemon [--verbose] [--syslog] [--inetd | --port=n] [--export-all]\n"
+"git-daemon [--verbose] [--syslog] [--export-all]\n"
 "           [--timeout=n] [--init-timeout=n] [--strict-paths]\n"
 "           [--base-path=path] [--user-path | --user-path=path]\n"
 "           [--interpolated-path=path]\n"
 "           [--reuseaddr] [--detach] [--pid-file=file]\n"
 "           [--[enable|disable|allow-override|forbid-override]=service]\n"
-"           [--user=user [[--group=group]] [directory...]";
+"           [--inetd | [--listen=host_or_ipaddr] [--port=n]\n"
+"                      [--user=user [--group=group]]\n"
+"           [directory...]";
 
 /* List of acceptable pathname prefixes */
 static char **ok_paths;
@@ -56,11 +59,17 @@ static unsigned int init_timeout;
  * Feel free to make dynamic as needed.
  */
 #define INTERP_SLOT_HOST	(0)
-#define INTERP_SLOT_DIR		(1)
-#define INTERP_SLOT_PERCENT	(2)
+#define INTERP_SLOT_CANON_HOST	(1)
+#define INTERP_SLOT_IP		(2)
+#define INTERP_SLOT_PORT	(3)
+#define INTERP_SLOT_DIR		(4)
+#define INTERP_SLOT_PERCENT	(5)
 
 static struct interp interp_table[] = {
 	{ "%H", 0},
+	{ "%CH", 0},
+	{ "%IP", 0},
+	{ "%P", 0},
 	{ "%D", 0},
 	{ "%%", "%"},
 };
@@ -408,9 +417,17 @@ static void parse_extra_args(char *extra_args, int buflen)
 			val = extra_args + 5;
 			vallen = strlen(val) + 1;
 			if (*val) {
-				char *save = xmalloc(vallen);
+				char *port;
+				char *save = xmalloc(vallen);	/* FIXME: Leak */
+
 				interp_table[INTERP_SLOT_HOST].value = save;
 				strlcpy(save, val, vallen);
+				port = strrchr(save, ':');
+				if (port) {
+					*port = 0;
+					port++;
+					interp_table[INTERP_SLOT_PORT].value = port;
+				}
 			}
 			/* On to the next one */
 			extra_args = val + vallen;
@@ -418,6 +435,73 @@ static void parse_extra_args(char *extra_args, int buflen)
 	}
 }
 
+void fill_in_extra_table_entries(struct interp *itable)
+{
+	char *hp;
+	char *canon_host = NULL;
+	char *ipaddr = NULL;
+
+	/*
+	 * Replace literal host with lowercase-ized hostname.
+	 */
+	hp = interp_table[INTERP_SLOT_HOST].value;
+	for ( ; *hp; hp++)
+		*hp = tolower(*hp);
+
+	/*
+	 * Locate canonical hostname and its IP address.
+	 */
+#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(interp_table[INTERP_SLOT_HOST].value, 0, &hints, &ai0);
+		if (!gai) {
+			for (ai = ai0; ai; ai = ai->ai_next) {
+				struct sockaddr_in *sin_addr = (void *)ai->ai_addr;
+
+				canon_host = xstrdup(ai->ai_canonname);
+				inet_ntop(AF_INET, &sin_addr->sin_addr,
+					  addrbuf, sizeof(addrbuf));
+				ipaddr = addrbuf;
+				break;
+			}
+			freeaddrinfo(ai0);
+		}
+	}
+#else
+	{
+		struct hostent *hent;
+		struct sockaddr_in sa;
+		char **ap;
+		static char addrbuf[HOST_NAME_MAX + 1];
+
+		hent = gethostbyname(interp_table[INTERP_SLOT_HOST].value);
+		canon_host = xstrdup(hent->h_name);
+
+		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));
+		ipaddr = addrbuf;
+	}
+#endif
+
+	interp_table[INTERP_SLOT_CANON_HOST].value = canon_host;	/* FIXME: Leak */
+	interp_table[INTERP_SLOT_IP].value = xstrdup(ipaddr);		/* FIXME: Leak */
+}
+
+
 static int execute(struct sockaddr *addr)
 {
 	static char line[1000];
@@ -458,8 +542,10 @@ static int execute(struct sockaddr *addr)
 	if (len && line[len-1] == '\n')
 		line[--len] = 0;
 
-	if (len != pktlen)
+	if (len != pktlen) {
 	    parse_extra_args(line + len + 1, pktlen - len - 1);
+	    fill_in_extra_table_entries(interp_table);
+	}
 
 	for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
 		struct daemon_service *s = &(daemon_service[i]);
@@ -663,23 +749,22 @@ static int set_reuse_addr(int sockfd)
 
 #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;
 
-	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));
 
@@ -733,20 +818,27 @@ static int socksetup(int port, int **socklist_p)
 
 #else /* NO_IPV6 */
 
-static int socksetup(int port, int **socklist_p)
+static int socksetup(char *lisen_addr, int listen_port, int **socklist_p)
 {
 	struct sockaddr_in sin;
 	int sockfd;
 
+	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;
@@ -855,13 +947,14 @@ static void store_pid(const char *path)
 	fclose(f);
 }
 
-static int serve(int port, struct passwd *pass, gid_t gid)
+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) ||
@@ -873,7 +966,8 @@ static int serve(int port, struct passwd *pass, gid_t gid)
 
 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;
@@ -890,12 +984,20 @@ int main(int argc, char **argv)
 	for (i = 1; i < argc; i++) {
 		char *arg = argv[i];
 
+		if (!strncmp(arg, "--listen=", 9)) {
+		    char *p = arg + 9;
+		    char *ph = listen_addr = xmalloc(strlen(arg + 9) + 1);
+		    while (*p)
+			*ph++ = tolower(*p++);
+		    *ph = 0;
+		    continue;
+		}
 		if (!strncmp(arg, "--port=", 7)) {
 			char *end;
 			unsigned long n;
 			n = strtoul(arg+7, &end, 0);
 			if (arg[7] && !*end) {
-				port = n;
+				listen_port = n;
 				continue;
 			}
 		}
@@ -995,6 +1097,11 @@ int main(int argc, char **argv)
 	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");
 
@@ -1043,5 +1150,5 @@ int main(int argc, char **argv)
 	if (pid_file)
 		store_pid(pid_file);
 
-	return serve(port, pass, gid);
+	return serve(listen_addr, listen_port, pass, gid);
 }