fix: CWE-134 format string audit and compiler hardening

Security:
Fix CWE-134 in iq.c: user-controlled string passed as format argument
Add G_GNUC_PRINTF annotations to all variadic printf-like wrappers
in ui.h, log.h and http_common.h
Compiler flags (configure.ac):

Replace basic -Wformat/-Wformat-nonliteral with -Wformat=2
Add -Wextra, -Wnull-dereference, -Wpointer-arith,
-Wimplicit-function-declaration, -Wundef, -Wfloat-equal,
-Wredundant-decls, -Walloc-zero
Add -fstack-protector-strong, -fno-common, -D_FORTIFY_SOURCE=2
Add GCC-specific flags via AC_COMPILE_IFELSE: -Wlogical-op,
-Wduplicated-cond, -Wduplicated-branches, -Wstringop-overflow,
-Warray-bounds=2
Suppress noisy -Wextra sub-warnings: -Wno-unused-parameter,
-Wno-missing-field-initializers, -Wno-sign-compare,
-Wno-cast-function-type
Remove AM_CFLAGS/CFLAGS duplication
Bug fixes found by new warnings:

chatlog.c: non-MUCPM redact path passed resourcepart instead of NULL
rosterwin.c: merge duplicated if/else branches into single condition
omemo.c: redundant else-if in omemo_automatic_start; remove
unnecessary scope block and goto, use early return
console.c: pointer compared to integer 0 instead of NULL
stanza.c: increase pri_str/idle_str buffers from 10 to 12 bytes
(INT_MIN = -2147483648 needs 12 bytes including NUL)
vcard.c: NULL guard for filename before g_file_set_contents
api.c: broken log_warning() calls with extra format argument
Format mismatch fixes:

chatwin.c: Jid* → char* for %s
connection.c: %x → %lx for long flags
cmd_funcs.c: %d → %zu for size_t; cast gpointer to char* for %s
cmd_defs.c: %d → %u for g_list_length() return (guint)
iq.c: barejid → fulljid for from_jid
console.c, mucwin.c, privwin.c, account.c, omemo.c, presence.c:
gpointer → (char*) casts for %s
Const-correctness and cleanup:

database.c: const for type, query, sort variables
form.c/xmpp.h: const for form_set_value parameter
files.c: refactor to early return, eliminating NULL logfile path
muc.c/muc.h: remove meaningless top-level const on return type
common.c: const for URL string literal
Remove stale declarations: cons_show_desktop_prefs (ui.h),
connection_set_priority (connection.h),
omemo_devicelist_configure_and_request (omemo.h)
test_common.c: add currb NULL check to silence -Wnull-dereference
Tooling (check-cwe134.sh):

Reduce from 5 checks to 2 (checks 1-3 redundant with -Wformat=2)
Check 1: verify known wrappers have G_GNUC_PRINTF attribute
Check 2: auto-detect unannotated variadic printf-like functions
Match both const char* and const gchar* in variadic patterns

Author: jabber.developer2 <jabber.developer2@jabber.space>

src/ui/chatwin.c

@@ -303,7 +303,7 @@ chatwin_incoming_msg(ProfChatWin* chatwin, ProfMessage* message, gboolean win_cr
     assert(chatwin != NULL);
 
     if (message->plain == NULL) {
-        log_error("chatwin_incoming_msg: Message with no plain field from: %s", message->from_jid);
+        log_error("chatwin_incoming_msg: Message with no plain field from: %s", message->from_jid->fulljid);
         return;
     }
 

src/ui/console.c

@@ -470,10 +470,10 @@ cons_show_wins(gboolean unread)
 
     GSList* curr = window_strings;
     while (curr) {
-        if (g_strstr_len(curr->data, strlen(curr->data), " unread") > 0) {
-            win_println(console, THEME_CMD_WINS_UNREAD, "-", "%s", curr->data);
+        if (g_strstr_len((char*)curr->data, strlen((char*)curr->data), " unread") != NULL) {
+            win_println(console, THEME_CMD_WINS_UNREAD, "-", "%s", (char*)curr->data);
         } else {
-            win_println(console, THEME_DEFAULT, "-", "%s", curr->data);
+            win_println(console, THEME_DEFAULT, "-", "%s", (char*)curr->data);
         }
         curr = g_slist_next(curr);
     }
@@ -491,10 +491,10 @@ cons_show_wins_attention()
 
     GSList* curr = window_strings;
     while (curr) {
-        if (g_strstr_len(curr->data, strlen(curr->data), " unread") > 0) {
-            win_println(console, THEME_CMD_WINS_UNREAD, "-", "%s", curr->data);
+        if (g_strstr_len((char*)curr->data, strlen((char*)curr->data), " unread") != NULL) {
+            win_println(console, THEME_CMD_WINS_UNREAD, "-", "%s", (char*)curr->data);
         } else {
-            win_println(console, THEME_DEFAULT, "-", "%s", curr->data);
+            win_println(console, THEME_DEFAULT, "-", "%s", (char*)curr->data);
         }
         curr = g_slist_next(curr);
     }
@@ -512,7 +512,7 @@ cons_show_room_invites(GList* invites)
     } else {
         cons_show("Chat room invites, use /join or /decline commands:");
         while (invites) {
-            cons_show("  %s", invites->data);
+            cons_show("  %s", (char*)invites->data);
             invites = g_list_next(invites);
         }
     }
@@ -591,7 +591,7 @@ cons_show_caps(const char* const fulljid, resource_presence_t presence)
             win_println(console, THEME_DEFAULT, "-", "Features:");
             GSList* feature = caps->features;
             while (feature) {
-                win_println(console, THEME_DEFAULT, "-", " %s", feature->data);
+                win_println(console, THEME_DEFAULT, "-", " %s", (char*)feature->data);
                 feature = g_slist_next(feature);
             }
         }
@@ -611,10 +611,10 @@ cons_show_received_subs(void)
     if (received == NULL) {
         cons_show("No outstanding subscription requests.");
     } else {
-        cons_show("Outstanding subscription requests from:",
+        cons_show("Outstanding subscription requests from (%d):",
                   g_list_length(received));
         while (received) {
-            cons_show("  %s", received->data);
+            cons_show("  %s", (char*)received->data);
             received = g_list_next(received);
         }
         g_list_free_full(received, g_free);
@@ -782,7 +782,7 @@ cons_show_disco_info(const char* jid, GSList* identities, GSList* features)
             cons_show("  Features:");
         }
         while (features) {
-            cons_show("    %s", features->data);
+            cons_show("    %s", (char*)features->data);
             features = g_slist_next(features);
         }
 
@@ -2297,7 +2297,7 @@ cons_show_themes(GSList* themes)
     } else {
         cons_show("Available themes:");
         while (themes) {
-            cons_show("%s", themes->data);
+            cons_show("%s", (char*)themes->data);
             themes = g_slist_next(themes);
         }
     }
@@ -2315,7 +2315,7 @@ cons_show_scripts(GSList* scripts)
     } else {
         cons_show("Scripts:");
         while (scripts) {
-            cons_show("%s", scripts->data);
+            cons_show("%s", (char*)scripts->data);
             scripts = g_slist_next(scripts);
         }
     }
@@ -2333,7 +2333,7 @@ cons_show_script(const char* const script, GSList* commands)
     } else {
         cons_show("%s:", script);
         while (commands) {
-            cons_show("  %s", commands->data);
+            cons_show("  %s", (char*)commands->data);
             commands = g_slist_next(commands);
         }
     }

src/ui/mucwin.c

@@ -218,7 +218,7 @@ mucwin_room_disco_info(ProfMucWin* mucwin, GSList* identities, GSList* features)
             win_println(window, THEME_DEFAULT, "!", "Features:");
         }
         while (features) {
-            win_println(window, THEME_DEFAULT, "!", "  %s", features->data);
+            win_println(window, THEME_DEFAULT, "!", "  %s", (char*)features->data);
             features = g_slist_next(features);
         }
         win_println(window, THEME_DEFAULT, "-", "");
@@ -534,7 +534,7 @@ mucwin_incoming_msg(ProfMucWin* mucwin, const ProfMessage* const message, GSList
     int flags = 0;
 
     if (message->plain == NULL) {
-        log_error("mucwin_incoming_msg: Message with no plain field from: %s", message->from_jid);
+        log_error("mucwin_incoming_msg: Message with no plain field from: %s", message->from_jid->fulljid);
         return;
     }
 

src/ui/privwin.c

@@ -52,7 +52,7 @@ privwin_incoming_msg(ProfPrivateWin* privatewin, ProfMessage* message)
     assert(privatewin != NULL);
 
     if (message->plain == NULL) {
-        log_error("privwin_incoming_msg: Message with no plain field from: %s", message->from_jid);
+        log_error("privwin_incoming_msg: Message with no plain field from: %s", message->from_jid->fulljid);
         return;
     }
 

src/ui/rosterwin.c

@@ -981,9 +981,7 @@ _rosterwin_unsubscribed_header(ProfLayoutSplit* layout, GList* wins)
     auto_gchar gchar* countpref = prefs_get_string(PREF_ROSTER_COUNT);
     if (g_strcmp0(countpref, "items") == 0) {
         int itemcount = g_list_length(wins);
-        if (itemcount == 0 && prefs_get_boolean(PREF_ROSTER_COUNT_ZERO)) {
-            g_string_append_printf(header, " (%d)", itemcount);
-        } else {
+        if (itemcount != 0 || prefs_get_boolean(PREF_ROSTER_COUNT_ZERO)) {
             g_string_append_printf(header, " (%d)", itemcount);
         }
     } else if (g_strcmp0(countpref, "unread") == 0) {
@@ -994,9 +992,7 @@ _rosterwin_unsubscribed_header(ProfLayoutSplit* layout, GList* wins)
             unreadcount += chatwin->unread;
             curr = g_list_next(curr);
         }
-        if (unreadcount == 0 && prefs_get_boolean(PREF_ROSTER_COUNT_ZERO)) {
-            g_string_append_printf(header, " (%d)", unreadcount);
-        } else if (unreadcount > 0) {
+        if (unreadcount != 0 || prefs_get_boolean(PREF_ROSTER_COUNT_ZERO)) {
             g_string_append_printf(header, " (%d)", unreadcount);
         }
     }
@@ -1026,9 +1022,7 @@ _rosterwin_contacts_header(ProfLayoutSplit* layout, const char* const title, GSL
     auto_gchar gchar* countpref = prefs_get_string(PREF_ROSTER_COUNT);
     if (g_strcmp0(countpref, "items") == 0) {
         int itemcount = g_slist_length(contacts);
-        if (itemcount == 0 && prefs_get_boolean(PREF_ROSTER_COUNT_ZERO)) {
-            g_string_append_printf(header, " (%d)", itemcount);
-        } else {
+        if (itemcount != 0 || prefs_get_boolean(PREF_ROSTER_COUNT_ZERO)) {
             g_string_append_printf(header, " (%d)", itemcount);
         }
     } else if (g_strcmp0(countpref, "unread") == 0) {
@@ -1043,9 +1037,7 @@ _rosterwin_contacts_header(ProfLayoutSplit* layout, const char* const title, GSL
             }
             curr = g_slist_next(curr);
         }
-        if (unreadcount == 0 && prefs_get_boolean(PREF_ROSTER_COUNT_ZERO)) {
-            g_string_append_printf(header, " (%d)", unreadcount);
-        } else if (unreadcount > 0) {
+        if (unreadcount != 0 || prefs_get_boolean(PREF_ROSTER_COUNT_ZERO)) {
             g_string_append_printf(header, " (%d)", unreadcount);
         }
     }
@@ -1136,9 +1128,7 @@ _rosterwin_private_header(ProfLayoutSplit* layout, GList* privs)
     auto_gchar gchar* countpref = prefs_get_string(PREF_ROSTER_COUNT);
     if (g_strcmp0(countpref, "items") == 0) {
         int itemcount = g_list_length(privs);
-        if (itemcount == 0 && prefs_get_boolean(PREF_ROSTER_COUNT_ZERO)) {
-            g_string_append_printf(title_str, " (%d)", itemcount);
-        } else if (itemcount > 0) {
+        if (itemcount != 0 || prefs_get_boolean(PREF_ROSTER_COUNT_ZERO)) {
             g_string_append_printf(title_str, " (%d)", itemcount);
         }
     } else if (g_strcmp0(countpref, "unread") == 0) {
@@ -1149,9 +1139,7 @@ _rosterwin_private_header(ProfLayoutSplit* layout, GList* privs)
             unreadcount += privwin->unread;
             curr = g_list_next(curr);
         }
-        if (unreadcount == 0 && prefs_get_boolean(PREF_ROSTER_COUNT_ZERO)) {
-            g_string_append_printf(title_str, " (%d)", unreadcount);
-        } else if (unreadcount > 0) {
+        if (unreadcount != 0 || prefs_get_boolean(PREF_ROSTER_COUNT_ZERO)) {
             g_string_append_printf(title_str, " (%d)", unreadcount);
         }
     }

src/ui/ui.h

@@ -244,7 +244,9 @@ char* inp_readline(void);
 void inp_nonblocking(gboolean reset);
 
 // Console window
+G_GNUC_PRINTF(1, 2)
 void cons_show(const char* const msg, ...);
+G_GNUC_PRINTF(2, 3)
 void cons_show_padded(int pad, const char* const msg, ...);
 void cons_about(void);
 void cons_help(void);
@@ -263,7 +265,9 @@ void cons_show_pgp_prefs(void);
 void cons_show_omemo_prefs(void);
 void cons_show_ox_prefs(void);
 void cons_show_account(ProfAccount* account);
+G_GNUC_PRINTF(1, 2)
 void cons_debug(const char* const msg, ...);
+G_GNUC_PRINTF(1, 2)
 void cons_show_error(const char* const cmd, ...);
 void cons_show_contacts(GSList* list);
 void cons_show_roster(GSList* list);
@@ -318,7 +322,6 @@ void cons_wrap_setting(void);
 void cons_time_setting(void);
 void cons_wintitle_setting(void);
 void cons_notify_setting(void);
-void cons_show_desktop_prefs(void);
 void cons_states_setting(void);
 void cons_outtype_setting(void);
 void cons_intype_setting(void);
@@ -393,16 +396,24 @@ void win_show_subwin(ProfWin* window);
 void win_refresh_without_subwin(ProfWin* window);
 void win_refresh_with_subwin(ProfWin* window);
 
+G_GNUC_PRINTF(4, 5)
 void win_print(ProfWin* window, theme_item_t theme_item, const char* show_char, const char* const message, ...);
+G_GNUC_PRINTF(4, 5)
 void win_println(ProfWin* window, theme_item_t theme_item, const char* show_char, const char* const message, ...);
+G_GNUC_PRINTF(3, 4)
 void win_println_indent(ProfWin* window, int pad, const char* const message, ...);
 
+G_GNUC_PRINTF(4, 0)
 void win_println_va(ProfWin* window, theme_item_t theme_item, const char* show_char, const char* const message, va_list arg);
 
+G_GNUC_PRINTF(3, 4)
 void win_append(ProfWin* window, theme_item_t theme_item, const char* const message, ...);
+G_GNUC_PRINTF(3, 4)
 void win_appendln(ProfWin* window, theme_item_t theme_item, const char* const message, ...);
 
+G_GNUC_PRINTF(3, 4)
 void win_append_highlight(ProfWin* window, theme_item_t theme_item, const char* const message, ...);
+G_GNUC_PRINTF(3, 4)
 void win_appendln_highlight(ProfWin* window, theme_item_t theme_item, const char* const message, ...);
 
 gchar* win_get_title(ProfWin* window);
@@ -416,6 +427,7 @@ void win_clear(ProfWin* window);
 char* win_get_tab_identifier(ProfWin* window);
 gchar* win_to_string(ProfWin* window);
 void win_command_list_error(ProfWin* window, const char* const error);
+G_GNUC_PRINTF(3, 4)
 void win_command_exec_error(ProfWin* window, const char* const command, const char* const error, ...);
 void win_handle_command_list(ProfWin* window, GSList* cmds);
 void win_handle_command_exec_status(ProfWin* window, const char* const type, const char* const value);