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Unix SMB/CIFS implementation.
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Samba utility functions
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Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2008
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Copyright (C) Andrew Tridgell 1992-1998
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Copyright (C) Jeremy Allison 2001-2007
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Copyright (C) Simo Sorce 2001
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Copyright (C) Jim McDonough (jmcd@us.ibm.com) 2003.
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Copyright (C) James J Myers 2003
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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#include "system/network.h"
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#include "system/locale.h"
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#include "system/filesys.h"
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bool interpret_string_addr_internal(struct addrinfo **ppres,
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const char *str, int flags)
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struct addrinfo hints;
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memset(&hints, '\0', sizeof(hints));
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/* By default make sure it supports TCP. */
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hints.ai_socktype = SOCK_STREAM;
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hints.ai_flags = flags;
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/* Linux man page on getaddinfo() says port will be
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uninitialized when service string in NULL */
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ret = getaddrinfo(str, NULL,
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DEBUG(3,("interpret_string_addr_internal: getaddrinfo failed "
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* Interpret an internet address or name into an IP address in 4 byte form.
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* RETURNS IN NETWORK BYTE ORDER (big endian).
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uint32_t interpret_addr(const char *str)
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/* If it's in the form of an IP address then
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* get the lib to interpret it */
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if (is_ipaddress_v4(str)) {
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if (inet_pton(AF_INET, str, &dest) <= 0) {
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/* Error - this shouldn't happen ! */
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DEBUG(0,("interpret_addr: inet_pton failed "
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ret = dest.s_addr; /* NETWORK BYTE ORDER ! */
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/* Otherwise assume it's a network name of some sort and use
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struct addrinfo *res = NULL;
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struct addrinfo *res_list = NULL;
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if (!interpret_string_addr_internal(&res_list,
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DEBUG(3,("interpret_addr: Unknown host. %s\n",str));
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/* Find the first IPv4 address. */
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for (res = res_list; res; res = res->ai_next) {
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if (res->ai_family != AF_INET) {
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if (res->ai_addr == NULL) {
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DEBUG(3,("interpret_addr: host address is "
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"invalid for host %s\n",str));
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freeaddrinfo(res_list);
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&((struct sockaddr_in *)res->ai_addr)->sin_addr.s_addr,
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freeaddrinfo(res_list);
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/* This is so bogus - all callers need fixing... JRA. */
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if (ret == (uint32_t)-1) {
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A convenient addition to interpret_addr().
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_PUBLIC_ struct in_addr interpret_addr2(const char *str)
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uint32_t a = interpret_addr(str);
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Check if an IP is the 0.0.0.0.
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_PUBLIC_ bool is_zero_ip_v4(struct in_addr ip)
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return ip.s_addr == 0;
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Are two IPs on the same subnet?
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_PUBLIC_ bool same_net_v4(struct in_addr ip1, struct in_addr ip2, struct in_addr mask)
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uint32_t net1,net2,nmask;
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nmask = ntohl(mask.s_addr);
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net1 = ntohl(ip1.s_addr);
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net2 = ntohl(ip2.s_addr);
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return((net1 & nmask) == (net2 & nmask));
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* Return true if a string could be an IPv4 address.
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bool is_ipaddress_v4(const char *str)
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ret = inet_pton(AF_INET, str, &dest);
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* Return true if a string could be an IPv4 or IPv6 address.
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bool is_ipaddress(const char *str)
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#if defined(HAVE_IPV6)
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if (strchr_m(str, ':')) {
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char addr[INET6_ADDRSTRLEN];
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struct in6_addr dest6;
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const char *sp = str;
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char *p = strchr_m(str, '%');
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* Cope with link-local.
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* This is IP:v6:addr%ifname.
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if (p && (p > str) && (if_nametoindex(p+1) != 0)) {
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MIN(PTR_DIFF(p,str)+1,
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ret = inet_pton(AF_INET6, sp, &dest6);
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return is_ipaddress_v4(str);
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* Is a sockaddr a broadcast address ?
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bool is_broadcast_addr(const struct sockaddr *pss)
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#if defined(HAVE_IPV6)
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if (pss->sa_family == AF_INET6) {
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const struct in6_addr *sin6 =
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&((const struct sockaddr_in6 *)pss)->sin6_addr;
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return IN6_IS_ADDR_MULTICAST(sin6);
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if (pss->sa_family == AF_INET) {
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ntohl(((const struct sockaddr_in *)pss)->sin_addr.s_addr);
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return addr == INADDR_BROADCAST;
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* Check if an IPv7 is 127.0.0.1
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bool is_loopback_ip_v4(struct in_addr ip)
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a.s_addr = htonl(INADDR_LOOPBACK);
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return(ip.s_addr == a.s_addr);
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* Check if a struct sockaddr is the loopback address.
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bool is_loopback_addr(const struct sockaddr *pss)
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#if defined(HAVE_IPV6)
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if (pss->sa_family == AF_INET6) {
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const struct in6_addr *pin6 =
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&((const struct sockaddr_in6 *)pss)->sin6_addr;
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return IN6_IS_ADDR_LOOPBACK(pin6);
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if (pss->sa_family == AF_INET) {
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const struct in_addr *pin = &((const struct sockaddr_in *)pss)->sin_addr;
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return is_loopback_ip_v4(*pin);
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* Check if a struct sockaddr has an unspecified address.
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bool is_zero_addr(const struct sockaddr *pss)
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#if defined(HAVE_IPV6)
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if (pss->sa_family == AF_INET6) {
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const struct in6_addr *pin6 =
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&((const struct sockaddr_in6 *)pss)->sin6_addr;
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return IN6_IS_ADDR_UNSPECIFIED(pin6);
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if (pss->sa_family == AF_INET) {
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const struct in_addr *pin = &((const struct sockaddr_in *)pss)->sin_addr;
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return is_zero_ip_v4(*pin);
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* Set an IP to 0.0.0.0.
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void zero_ip_v4(struct in_addr *ip)
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memset(ip, '\0', sizeof(struct in_addr));
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* Convert an IPv4 struct in_addr to a struct sockaddr_storage.
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void in_addr_to_sockaddr_storage(struct sockaddr_storage *ss,
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struct sockaddr_in *sa = (struct sockaddr_in *)ss;
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memset(ss, '\0', sizeof(*ss));
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sa->sin_family = AF_INET;
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#if defined(HAVE_IPV6)
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* Convert an IPv6 struct in_addr to a struct sockaddr_storage.
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void in6_addr_to_sockaddr_storage(struct sockaddr_storage *ss,
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struct sockaddr_in6 *sa = (struct sockaddr_in6 *)ss;
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memset(ss, '\0', sizeof(*ss));
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sa->sin6_family = AF_INET6;
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* Are two IPs on the same subnet?
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bool same_net(const struct sockaddr *ip1,
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const struct sockaddr *ip2,
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const struct sockaddr *mask)
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if (ip1->sa_family != ip2->sa_family) {
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/* Never on the same net. */
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#if defined(HAVE_IPV6)
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if (ip1->sa_family == AF_INET6) {
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struct sockaddr_in6 ip1_6 = *(const struct sockaddr_in6 *)ip1;
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struct sockaddr_in6 ip2_6 = *(const struct sockaddr_in6 *)ip2;
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struct sockaddr_in6 mask_6 = *(const struct sockaddr_in6 *)mask;
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char *p1 = (char *)&ip1_6.sin6_addr;
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char *p2 = (char *)&ip2_6.sin6_addr;
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char *m = (char *)&mask_6.sin6_addr;
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for (i = 0; i < sizeof(struct in6_addr); i++) {
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return (memcmp(&ip1_6.sin6_addr,
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sizeof(struct in6_addr)) == 0);
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if (ip1->sa_family == AF_INET) {
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return same_net_v4(((const struct sockaddr_in *)ip1)->sin_addr,
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((const struct sockaddr_in *)ip2)->sin_addr,
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((const struct sockaddr_in *)mask)->sin_addr);
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* Are two sockaddr 's the same family and address ? Ignore port etc.
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bool sockaddr_equal(const struct sockaddr *ip1,
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const struct sockaddr *ip2)
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if (ip1->sa_family != ip2->sa_family) {
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/* Never the same. */
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#if defined(HAVE_IPV6)
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if (ip1->sa_family == AF_INET6) {
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return (memcmp(&((const struct sockaddr_in6 *)ip1)->sin6_addr,
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&((const struct sockaddr_in6 *)ip2)->sin6_addr,
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sizeof(struct in6_addr)) == 0);
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if (ip1->sa_family == AF_INET) {
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return (memcmp(&((const struct sockaddr_in *)ip1)->sin_addr,
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&((const struct sockaddr_in *)ip2)->sin_addr,
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sizeof(struct in_addr)) == 0);
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* Is an IP address the INADDR_ANY or in6addr_any value ?
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bool is_address_any(const struct sockaddr *psa)
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#if defined(HAVE_IPV6)
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if (psa->sa_family == AF_INET6) {
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const struct sockaddr_in6 *si6 = (const struct sockaddr_in6 *)psa;
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if (memcmp(&in6addr_any,
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sizeof(in6addr_any)) == 0) {
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if (psa->sa_family == AF_INET) {
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const struct sockaddr_in *si = (const struct sockaddr_in *)psa;
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if (si->sin_addr.s_addr == INADDR_ANY) {
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void set_sockaddr_port(struct sockaddr *psa, uint16_t port)
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#if defined(HAVE_IPV6)
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if (psa->sa_family == AF_INET6) {
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((struct sockaddr_in6 *)psa)->sin6_port = htons(port);
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if (psa->sa_family == AF_INET) {
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((struct sockaddr_in *)psa)->sin_port = htons(port);