-/* $Cambridge: exim/src/src/os.c,v 1.7 2009/10/20 12:39:47 nm4 Exp $ */
-
/*************************************************
* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2007 */
+/* Copyright (c) University of Cambridge 1995 - 2018 */
+/* Copyright (c) The Exim Maintainers 2021 */
/* See the file NOTICE for conditions of use and distribution. */
#ifdef STAND_ALONE
-#include <signal.h>
-#include <stdio.h>
-#include <time.h>
+# include <signal.h>
+# include <stdio.h>
+# include <time.h>
+#endif
+
+#ifndef CS
+# define CS (char *)
+# define US (unsigned char *)
#endif
/* This source file contains "default" system-dependent functions which
signal numbers. I've been extra cautious with the ifdef's here. Probably more
than is necessary... */
-char *
-os_strsignal(int n)
+const char *
+os_strsignal(const int n)
{
switch (n)
{
exit codes into text, but this function is implemented this way so that if any
OS does have such a thing, it could be used instead of this build-in one. */
-char *
-os_strexit(int n)
+const char *
+os_strexit(const int n)
{
switch (n)
{
}
if (lseek (avg_kd, avg_offset, 0) == -1L
- || read (avg_kd, (char *)(&avg), sizeof (avg)) != sizeof(avg))
+ || read (avg_kd, CS (&avg), sizeof (avg)) != sizeof(avg))
return -1;
return (int)(((double)avg/FSCALE)*1000.0);
log_write(0, LOG_PANIC_DIE, "Unable to call getifaddrs: %d %s",
errno, strerror(errno));
-struct ifaddrs *ifa;
-for (ifa = ifalist; ifa != NULL; ifa = ifa->ifa_next)
+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;
/* Create a data block for the address, fill in the data, and put it on the
chain. */
- next = store_get(sizeof(ip_address_item));
+ next = store_get(sizeof(ip_address_item), FALSE);
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
{
ip_address_item *yield = NULL;
ip_address_item *last = NULL;
ip_address_item *next;
-char *cp;
char buf[MAX_INTERFACES*sizeof(struct V_ifreq)];
struct sockaddr *addrp;
size_t len = 0;
ifc.V_ifc_flags = 0;
#endif
-if (ioctl(vs, V_GIFCONF, (char *)&ifc) < 0)
+if (ioctl(vs, V_GIFCONF, CS &ifc) < 0)
log_write(0, LOG_PANIC_DIE, "Unable to get interface configuration: %d %s",
errno, strerror(errno));
struct to some aligned memory before looking at the field in the fixed part to
find its length, and then recopy the correct length. */
-for (cp = buf; cp < buf + ifc.V_ifc_len; cp += len)
+for (char * cp = buf; cp < buf + ifc.V_ifc_len; cp += len)
{
- memcpy((char *)&ifreq, cp, sizeof(ifreq));
+ memcpy(CS &ifreq, cp, sizeof(ifreq));
#ifndef HAVE_SA_LEN
len = sizeof(struct V_ifreq);
interface hasn't been "plumbed" to any protocol (IPv4 or IPv6). Therefore,
we now just treat this case as "down" as well. */
- if (ioctl(vs, V_GIFFLAGS, (char *)&ifreq) < 0)
+ if (ioctl(vs, V_GIFFLAGS, CS &ifreq) < 0)
{
continue;
/*************
GIFFLAGS may have wrecked the data. */
#ifndef SIOCGIFCONF_GIVES_ADDR
- if (ioctl(vs, V_GIFADDR, (char *)&ifreq) < 0)
+ if (ioctl(vs, V_GIFADDR, CS &ifreq) < 0)
log_write(0, LOG_PANIC_DIE, "Unable to get IP address for %s interface: "
"%d %s", ifreq.V_ifr_name, errno, strerror(errno));
addrp = &ifreq.V_ifr_addr;
/* Create a data block for the address, fill in the data, and put it on the
chain. */
- next = store_get(sizeof(ip_address_item));
+ next = store_get(sizeof(ip_address_item), FALSE);
next->next = NULL;
next->port = 0;
(void)host_ntoa(-1, addrp, next->address, NULL);
ip_address_item *
os_common_find_running_interfaces(void)
{
-ip_address_item *yield = store_get(sizeof(address_item));
+ip_address_item *yield = store_get(sizeof(address_item), FALSE);
yield->address = US"127.0.0.1";
yield->port = 0;
yield->next = NULL;
#if HAVE_IPV6
-yield->next = store_get(sizeof(address_item));
+yield->next = store_get(sizeof(address_item), FALSE);
yield->next->address = US"::1";
yield->next->port = 0;
yield->next->next = NULL;
+/* ----------------------------------------------------------------------- */
+
+/***********************************************************
+* DNS Resolver Base Finder *
+***********************************************************/
+
+/* We need to be able to set options for the system resolver(5), historically
+made available as _res. At least one OS (NetBSD) now no longer provides this
+directly, instead making you call a function per thread to get a handle.
+Other OSs handle thread-safe resolver differently, in ways which fail if the
+programmer creates their own structs. */
+
+#if !defined(OS_GET_DNS_RESOLVER_RES) && !defined(COMPILE_UTILITY)
+
+#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
+should be descended from ISC's bind.
+
+Linux and BSD do:
+ define _res (*__res_state())
+identically. We just can't rely on __foo functions. It's surprising that use
+of _res has been as portable as it has, for so long.
+
+So, since _res works everywhere, and everything can decode the struct, I'm
+going to gamble that res_state is a typedef everywhere and use that as the
+return type.
+*/
+
+res_state
+os_get_dns_resolver_res(void)
+{
+return &_res;
+}
+
+#endif /* OS_GET_DNS_RESOLVER_RES */
+
+/* ----------------------------------------------------------------------- */
+
+/***********************************************************
+* unsetenv() *
+***********************************************************/
+
+/* Most modern systems define int unsetenv(const char*),
+* some don't. */
+
+#if !defined(OS_UNSETENV)
+int
+os_unsetenv(const unsigned char * name)
+{
+return unsetenv(CS name);
+}
+#endif
+
+/* ----------------------------------------------------------------------- */
+
+/***********************************************************
+* getcwd() *
+***********************************************************/
+
+/* Glibc allows getcwd(NULL, 0) to do auto-allocation. Some systems
+do auto-allocation, but need the size of the buffer, and others
+may not even do this. If the OS supports getcwd(NULL, 0) we'll use
+this, for all other systems we provide our own getcwd() */
+
+#if !defined(OS_GETCWD)
+unsigned char *
+os_getcwd(unsigned char * buffer, size_t size)
+{
+return US getcwd(CS buffer, size);
+}
+#else
+#ifndef PATH_MAX
+# define PATH_MAX 4096
+#endif
+unsigned char *
+os_getcwd(unsigned char * buffer, size_t size)
+{
+char * b = CS buffer;
+
+if (!size) size = PATH_MAX;
+if (!b && !(b = malloc(size))) return NULL;
+if (!(b = getcwd(b, size))) return NULL;
+return buffer ? buffer : realloc(b, strlen(b) + 1);
+}
+#endif
+
+/* ----------------------------------------------------------------------- */
+
+
+
/*************************************************
**************************************************
printf("Testing restarting signal; wait for handler message, then type a line\n");
strcpy(buffer, "*** default ***\n");
os_restarting_signal(SIGALRM, sigalrm_handler);
-alarm(2);
+ALARM(2);
if ((rc = read(fd, buffer, sizeof(buffer))) < 0)
printf("No data read\n");
else
buffer[rc] = 0;
printf("Read: %s", buffer);
}
-alarm(0);
+ALARM_CLR(0);
printf("Testing non-restarting signal; should read no data after handler message\n");
strcpy(buffer, "*** default ***\n");
os_non_restarting_signal(SIGALRM, sigalrm_handler);
-alarm(2);
+ALARM(2);
if ((rc = read(fd, buffer, sizeof(buffer))) < 0)
printf("No data read\n");
else
buffer[rc] = 0;
printf("Read: %s", buffer);
}
-alarm(0);
+ALARM_CLR(0);
printf("Testing load averages (last test - ^C to kill)\n");
for (;;)
git://git.exim.org / exim.git / blobdiff