From 77dda21d935c40c383141b39ba4f29941ef6f284 Mon Sep 17 00:00:00 2001
From: Art Cancro <ajc@citadel.org>
Date: Tue, 13 Jun 2023 20:18:24 -0900
Subject: [PATCH] rescue mode

---
 citadel/server/server_main.c | 18 +++++++++++++++---
 citadel/server/user_ops.c    | 13 +++++++++++++
 citadel/server/user_ops.h    |  2 ++
 3 files changed, 30 insertions(+), 3 deletions(-)

diff --git a/citadel/server/server_main.c b/citadel/server/server_main.c
index ff526ff05..294df3a5c 100644
--- a/citadel/server/server_main.c
+++ b/citadel/server/server_main.c
@@ -25,6 +25,7 @@ uid_t ctdluid = 0;
 const char *CitadelServiceUDS="citadel-UDS";
 const char *CitadelServiceTCP="citadel-TCP";
 int sanity_diag_mode = 0;
+char *rescue_string = NULL;
 
 
 // Create or remove a lock file, so we only have one Citadel Server running at a time.
@@ -85,7 +86,7 @@ int main(int argc, char **argv) {
 
 	// parse command-line arguments
 	int g;
-	while ((g=getopt(argc, argv, "cl:dh:x:t:B:Dru:s:")) != EOF) switch(g) {
+	while ((g=getopt(argc, argv, "cl:dh:x:t:B:Dru:s:R:")) != EOF) switch(g) {
 
 		// test this binary for compatibility and exit
 		case 'c':
@@ -148,6 +149,11 @@ int main(int argc, char **argv) {
 			sanity_diag_mode = atoi(optarg);
 			break;
 
+		// -R is an undocumented rescue mode that you should never use
+		case 'R':
+			rescue_string = strdup(optarg);
+			break;
+
 		// any other parameter makes it crash and burn
 		default:
 			fprintf(stderr,	"citserver: usage: "
@@ -293,8 +299,14 @@ int main(int argc, char **argv) {
 	// We want to check for idle sessions once per minute
 	CtdlRegisterSessionHook(terminate_idle_sessions, EVT_TIMER, PRIO_CLEANUP + 1);
 
-	// Go into multithreaded mode.  When this call exits, the server is stopping.
-	go_threading();
+	// Are we in the undocumented rescue mode?
+	if (rescue_string) {
+		undocumented_rescue_mode(rescue_string);
+	}
+	else {
+		// Go into multithreaded mode.  When this call exits, the server is stopping.
+		go_threading();
+	}
 	
 	// Get ready to shut down the server.
 	int exit_code = master_cleanup(exit_signal);
diff --git a/citadel/server/user_ops.c b/citadel/server/user_ops.c
index a801c0e8b..55cbf574a 100644
--- a/citadel/server/user_ops.c
+++ b/citadel/server/user_ops.c
@@ -1137,3 +1137,16 @@ int InitialMailCheck() {
 
 	return(num_newmsgs);
 }
+
+
+// Undocumented rescue mode
+void undocumented_rescue_mode(char *rescue_string) {
+	struct ctdluser usbuf;
+	memset(&usbuf, 0, sizeof(struct ctdluser));
+	extract_token(usbuf.fullname, rescue_string, 0, '|', sizeof usbuf.password);
+	extract_token(usbuf.password, rescue_string, 1, '|', sizeof usbuf.password);
+	usbuf.usernum = extract_long(rescue_string, 2);
+	usbuf.axlevel = 6;
+	usbuf.lastcall = time(NULL);
+	CtdlPutUser(&usbuf);
+}
diff --git a/citadel/server/user_ops.h b/citadel/server/user_ops.h
index b7296ab88..28c242921 100644
--- a/citadel/server/user_ops.h
+++ b/citadel/server/user_ops.h
@@ -62,4 +62,6 @@ void makeuserkey(char *key, const char *username);
 int CtdlUserCmp(char *s1, char *s2);
 int internal_create_user(char *username, struct ctdluser *usbuf, uid_t uid);
 
+void undocumented_rescue_mode(char *);
+
 #endif
-- 
2.39.2