X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/f3ebb786e451da973560f1c9d8cdb151d25108b5..d945e180cbe2b26392fb21f7ae4dd2ccc603a81b:/src/src/os.c

diff --git a/src/src/os.c b/src/src/os.c
index c44bd3e99..3b49e4b9e 100644
--- a/src/src/os.c
+++ b/src/src/os.c
@@ -2,13 +2,18 @@
 *     Exim - an Internet mail transport agent    *
 *************************************************/
 
+/* Copyright (c) The Exim Maintainers 2021 - 2023 */
 /* Copyright (c) University of Cambridge 1995 - 2018 */
 /* See the file NOTICE for conditions of use and distribution. */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
 
 #ifdef STAND_ALONE
 # include <signal.h>
 # include <stdio.h>
 # include <time.h>
+#else
+# define IS_DEBUG(x) (debug_selector & (x))
+# define DEBUG(x) if (IS_DEBUG(x))
 #endif
 
 #ifndef CS
@@ -48,9 +53,9 @@ sigemptyset(&(act.sa_mask));
 act.sa_flags = SA_RESTART;
 sigaction(sig, &act, NULL);
 
-#ifdef STAND_ALONE
+# ifdef STAND_ALONE
 printf("Used SA_RESTART\n");
-#endif
+# endif
 
 /* SunOS4 and Ultrix default to non-interruptable signals, with SV_INTERRUPT
 for making them interruptable. This seems to be a dying fashion. */
@@ -58,9 +63,9 @@ for making them interruptable. This seems to be a dying fashion. */
 #elif defined SV_INTERRUPT
 signal(sig, handler);
 
-#ifdef STAND_ALONE
+# ifdef STAND_ALONE
 printf("Used default signal()\n");
-#endif
+# endif
 
 
 /* If neither SA_RESTART nor SV_INTERRUPT is available we don't know how to
@@ -69,9 +74,9 @@ set up a restarting signal, so simply suppress the facility. */
 #else
 signal(sig, SIG_IGN);
 
-#ifdef STAND_ALONE
+# ifdef STAND_ALONE
 printf("Used SIG_IGN\n");
-#endif
+# endif
 
 #endif
 }
@@ -359,9 +364,9 @@ here as there is the -hal variant, and other systems might follow this road one
 day. */
 
 #if !defined(OS_LOAD_AVERAGE) && defined(HAVE_KSTAT)
-#define OS_LOAD_AVERAGE
+# define OS_LOAD_AVERAGE
 
-#include <kstat.h>
+# include <kstat.h>
 
 int
 os_getloadavg(void)
@@ -395,7 +400,7 @@ return avg;
 #if !defined(OS_LOAD_AVERAGE) && defined(HAVE_DEV_KMEM)
 #define OS_LOAD_AVERAGE
 
-#include <nlist.h>
+# include <nlist.h>
 
 static int  avg_kd = -1;
 static long avg_offset;
@@ -479,7 +484,7 @@ Returns:      a chain of ip_address_items, each pointing to a textual
 
 #ifdef HAVE_GETIFADDRS
 
-#include <ifaddrs.h>
+# include <ifaddrs.h>
 
 ip_address_item *
 os_common_find_running_interfaces(void)
@@ -495,9 +500,11 @@ if (getifaddrs(&ifalist) != 0)
 
 for (struct ifaddrs * ifa = ifalist; ifa; ifa = ifa->ifa_next)
   {
-  if (ifa->ifa_addr->sa_family != AF_INET
+  struct sockaddr * ifa_addr = ifa->ifa_addr;
+  if (!ifa_addr) continue;
+  if (ifa_addr->sa_family != AF_INET
 #if HAVE_IPV6
-    && ifa->ifa_addr->sa_family != AF_INET6
+    && ifa_addr->sa_family != AF_INET6
 #endif /* HAVE_IPV6 */
     )
     continue;
@@ -508,12 +515,12 @@ for (struct ifaddrs * ifa = ifalist; ifa; ifa = ifa->ifa_next)
   /* Create a data block for the address, fill in the data, and put it on the
   chain. */
 
-  next = store_get(sizeof(ip_address_item), FALSE);
+  next = store_get(sizeof(ip_address_item), GET_UNTAINTED);
   next->next = NULL;
   next->port = 0;
-  (void)host_ntoa(-1, ifa->ifa_addr, next->address, NULL);
+  (void)host_ntoa(-1, ifa_addr, next->address, NULL);
 
-  if (yield == NULL)
+  if (!yield)
     yield = last = next;
   else
     {
@@ -626,13 +633,13 @@ what we want to know. */
 
 if ((vs = socket(FAMILY, SOCK_DGRAM, 0)) < 0)
   {
-  #if HAVE_IPV6
+#if HAVE_IPV6
   DEBUG(D_interface)
     debug_printf("Unable to create IPv6 socket to find interface addresses:\n  "
       "error %d %s\nTrying for an IPv4 socket\n", errno, strerror(errno));
   vs = socket(AF_INET, SOCK_DGRAM, 0);
   if (vs < 0)
-  #endif
+#endif
   log_write(0, LOG_PANIC_DIE, "Unable to create IPv4 socket to find interface "
     "addresses: %d %s", errno, strerror(errno));
   }
@@ -743,7 +750,7 @@ for (char * cp = buf; cp < buf + ifc.V_ifc_len; cp += len)
   /* Create a data block for the address, fill in the data, and put it on the
   chain. */
 
-  next = store_get(sizeof(ip_address_item), FALSE);
+  next = store_get(sizeof(ip_address_item), GET_UNTAINTED);
   next->next = NULL;
   next->port = 0;
   (void)host_ntoa(-1, addrp, next->address, NULL);
@@ -775,13 +782,13 @@ interfaces. We just return the loopback address(es). */
 ip_address_item *
 os_common_find_running_interfaces(void)
 {
-ip_address_item *yield = store_get(sizeof(address_item), FALSE);
+ip_address_item *yield = store_get(sizeof(address_item), GET_UNTAINTED);
 yield->address = US"127.0.0.1";
 yield->port = 0;
 yield->next = NULL;
 
 #if HAVE_IPV6
-yield->next = store_get(sizeof(address_item), FALSE);
+yield->next = store_get(sizeof(address_item), GET_UNTAINTED);
 yield->next->address = US"::1";
 yield->next->port = 0;
 yield->next->next = NULL;
@@ -812,7 +819,7 @@ programmer creates their own structs. */
 
 #if !defined(OS_GET_DNS_RESOLVER_RES) && !defined(COMPILE_UTILITY)
 
-#include <resolv.h>
+# include <resolv.h>
 
 /* confirmed that res_state is typedef'd as a struct* on BSD and Linux, will
 find out how unportable it is on other OSes, but most resolver implementations
@@ -831,7 +838,7 @@ return type.
 res_state
 os_get_dns_resolver_res(void)
 {
-  return &_res;
+return &_res;
 }
 
 #endif /* OS_GET_DNS_RESOLVER_RES */
@@ -887,6 +894,21 @@ return buffer ? buffer : realloc(b, strlen(b) + 1);
 #endif
 
 /* ----------------------------------------------------------------------- */
+/***********************************************************
+*             strchrnul()                                  *
+***********************************************************/
+
+#if !defined(EXIM_HAVE_STRCHRNUL)
+char *
+strchrnul(const char * s, int c)
+{
+while (*s != c && *s) s++;
+return CS s;
+}
+#endif
+
+
+/* ----------------------------------------------------------------------- */