From 83ddd409a43aa1dc74a34b60cc10bd2afed896b6 Mon Sep 17 00:00:00 2001
From: Lorenz Stechauner <lorenz.stechauner@necronda.net>
Date: Mon, 14 Apr 2025 23:51:09 +0200
Subject: [PATCH] proj: Allow exclutions of functions

---
 proj/intercept/src/intercept.c     | 16 +++++++++++++---
 proj/server/src/test-interrupts    |  1 +
 proj/server/src/test-return-values |  1 +
 3 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/proj/intercept/src/intercept.c b/proj/intercept/src/intercept.c
index d666055..eb0e086 100644
--- a/proj/intercept/src/intercept.c
+++ b/proj/intercept/src/intercept.c
@@ -829,10 +829,20 @@ static void init(void) {
         for (int i = 0; func_names[i] != NULL; i++) {
             const char *name1 = func_names[i];
             const int wildcard = name1[strlen(name1) - 1] == '*';
+            int not = 0;
+            if (name1[0] == '-') {
+                name1++;
+                not = 1;
+            }
             for (int j = 0; j < sizeof(func_names_ordered) / sizeof(char *); j++) {
                 const char *name2 = func_names_ordered[j];
-                if (strcmp(name1, name2) == 0 || (wildcard && strncmp(name1, name2, strlen(name1) - 1) == 0))
-                    func_flags[j] |= 1;
+                if (strcmp(name1, name2) == 0 || (wildcard && strncmp(name1, name2, strlen(name1) - 1) == 0)) {
+                    if (not) {
+                        func_flags[j] &= ~1;
+                    } else {
+                        func_flags[j] |= 1;
+                    }
+                }
             }
         }
     } else {
@@ -1158,7 +1168,7 @@ int sym(sigaction)(int sig, const struct sigaction *restrict act, struct sigacti
             if (maskstr[0] != 0) strcat(maskstr, ",");
             strcat(maskstr, getsigstr(i));
         }
-        msg("return %i; errno %s; oact={sa_flags: 0x%x:%s, %s: %p, sa-mask: [%s]}", ret, strerrorname_np(errno), oact->sa_flags, flgstr, name, ptr, maskstr);
+        msg("return %i; errno %s; oact={sa_flags: 0x%x:%s, %s: %p, sa_mask: [%s]}", ret, strerrorname_np(errno), oact->sa_flags, flgstr, name, ptr, maskstr);
     } else {
         msg("return %i; errno %s", ret, strerrorname_np(errno));
     }
diff --git a/proj/server/src/test-interrupts b/proj/server/src/test-interrupts
index a5ab202..c005edc 100755
--- a/proj/server/src/test-interrupts
+++ b/proj/server/src/test-interrupts
@@ -24,6 +24,7 @@ def main() -> None:
     subprocess.run(extra, env={
         'LD_PRELOAD': os.getcwd() + '/../../intercept/intercept.so',
         'INTERCEPT': 'unix:' + socket_name,
+        'INTERCEPT_FUNCTIONS': ','.join(['*', '-malloc', '-calloc', '-realloc', '-reallocarray', '-free']),
     })
 
 
diff --git a/proj/server/src/test-return-values b/proj/server/src/test-return-values
index df2bcc0..b59a3c6 100755
--- a/proj/server/src/test-return-values
+++ b/proj/server/src/test-return-values
@@ -35,6 +35,7 @@ def main() -> None:
         subprocess.run(extra, stdin=stdin, env={
             'LD_PRELOAD': os.getcwd() + '/../../intercept/intercept.so',
             'INTERCEPT': 'unix:' + socket_name,
+            'INTERCEPT_FUNCTIONS': ','.join(['*', '-malloc', '-calloc', '-realloc', '-reallocarray', '-free']),
         })
     for i, name in enumerate(ctx['call_sequence']):
         errors = [r[1] for r in ctx['results'] if r[0] == i]