Module: kamailio
Branch: 6.0
Commit: 830a9f349f0356bc695b8744b4c96218e690d9e8
URL: 
https://github.com/kamailio/kamailio/commit/830a9f349f0356bc695b8744b4c96218e690d9e8

Author: Henning Westerholt <h...@gilawa.com>
Committer: Xenofon Karamanos <22965395+xkara...@users.noreply.github.com>
Date: 2025-06-26T10:53:14Z

lrkproxy: improve randomness of cookie by using PNRG and random sequence numbers

(cherry picked from commit 4935196ee8ce1d99e77c614aaa0131a1972580ed)

---

Modified: src/modules/lrkproxy/lrkproxy.c

---

Diff:  
https://github.com/kamailio/kamailio/commit/830a9f349f0356bc695b8744b4c96218e690d9e8.diff
Patch: 
https://github.com/kamailio/kamailio/commit/830a9f349f0356bc695b8744b4c96218e690d9e8.patch

---

diff --git a/src/modules/lrkproxy/lrkproxy.c b/src/modules/lrkproxy/lrkproxy.c
index bc0a83f4e23..ef6a347105b 100644
--- a/src/modules/lrkproxy/lrkproxy.c
+++ b/src/modules/lrkproxy/lrkproxy.c
@@ -77,6 +77,7 @@
 #include "../../core/dset.h"
 #include "../../core/route.h"
 #include "../../core/kemi.h"
+#include "../../core/rand/fastrand.h"
 #include "../../modules/tm/tm_load.h"
 #include "lrkproxy.h"
 #include "lrkproxy_hash.h"
@@ -158,7 +159,6 @@ static void mod_destroy(void);
 static int lrkproxy_disable_tout = 60;
 static int lrkproxy_retr = 5;
 static int lrkproxy_tout = 1;
-static pid_t mypid;
 static unsigned int myseqn = 0;
 //static str nolrkproxy_str = str_init("a=nolrkproxy:yes");
 //static str extra_id_pv_param = {NULL, 0};
@@ -668,9 +668,10 @@ static int child_init(int rank)
                return 0;
        }
 
-       /* Iterate known LRK proxies - create sockets */
-       mypid = getpid();
+       /* random start value for for cookie sequence number */
+       myseqn = fastrand();
 
+       /* Iterate known RTP proxies - create sockets */
        lrkp_socks = (int *)pkg_malloc(sizeof(int) * lrkp_no);
        if(lrkp_socks == NULL) {
                LM_ERR("no more pkg memory\n");
@@ -791,7 +792,7 @@ static char *gencookie(void)
 {
        static char cook[34];
 
-       sprintf(cook, "%d_%u ", (int)mypid, myseqn);
+       sprintf(cook, "%d_%u ", fastrand(), myseqn);
        myseqn++;
        return cook;
 }

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