/* Unix SMB/CIFS implementation. Samba utility functions Copyright (C) Jelmer Vernooij 2008 Copyright (C) Andrew Tridgell 1992-1998 Copyright (C) Jeremy Allison 1992-2007 Copyright (C) Simo Sorce 2001 Copyright (C) Jim McDonough (jmcd@us.ibm.com) 2003. Copyright (C) James J Myers 2003 Copyright (C) Tim Potter 2000-2001 This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . */ #include "includes.h" #include "system/network.h" #include "system/locale.h" #include "system/filesys.h" #include "lib/util/util_net.h" #undef strcasecmp /******************************************************************* Set an address to INADDR_ANY. ******************************************************************/ void zero_sockaddr(struct sockaddr_storage *pss) { ZERO_STRUCTP(pss); /* Ensure we're at least a valid sockaddr-storage. */ pss->ss_family = AF_INET; } /** * Wrap getaddrinfo... */ bool interpret_string_addr_internal(struct addrinfo **ppres, const char *str, int flags) { int ret; struct addrinfo hints; ZERO_STRUCT(hints); /* By default make sure it supports TCP. */ hints.ai_socktype = SOCK_STREAM; /* always try as a numeric host first. This prevents unnecessary name * lookups, and also ensures we accept IPv6 addresses */ hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; ret = getaddrinfo(str, NULL, &hints, ppres); if (ret == 0) { return true; } hints.ai_flags = flags; /* Linux man page on getaddrinfo() says port will be uninitialized when service string is NULL */ ret = getaddrinfo(str, NULL, &hints, ppres); if (ret) { DEBUG(3, ("interpret_string_addr_internal: " "getaddrinfo failed for name %s (flags %d) [%s]\n", str, flags, gai_strerror(ret))); return false; } return true; } /******************************************************************* Map a text hostname or IP address (IPv4 or IPv6) into a struct sockaddr_storage. Takes a flag which allows it to prefer an IPv4 address (needed for DC's). ******************************************************************/ static bool interpret_string_addr_pref(struct sockaddr_storage *pss, const char *str, int flags, bool prefer_ipv4) { struct addrinfo *res = NULL; #if defined(HAVE_IPV6) char addr[INET6_ADDRSTRLEN]; unsigned int scope_id = 0; int int_flags; if (strchr_m(str, ':')) { char *p = strchr_m(str, '%'); /* * Cope with link-local. * This is IP:v6:addr%ifname. */ if (p && (p > str) && ((scope_id = if_nametoindex(p+1)) != 0)) { strlcpy(addr, str, MIN(PTR_DIFF(p,str)+1, sizeof(addr))); str = addr; } } #endif zero_sockaddr(pss); if (flags & AI_NUMERICHOST) { int_flags = flags; } else { int_flags = flags|AI_ADDRCONFIG; } if (!interpret_string_addr_internal(&res, str, int_flags)) { return false; } if (!res) { return false; } if (prefer_ipv4) { struct addrinfo *p; for (p = res; p; p = p->ai_next) { if (p->ai_family == AF_INET) { memcpy(pss, p->ai_addr, p->ai_addrlen); break; } } if (p == NULL) { /* Copy the first sockaddr. */ memcpy(pss, res->ai_addr, res->ai_addrlen); } } else { /* Copy the first sockaddr. */ memcpy(pss, res->ai_addr, res->ai_addrlen); } #if defined(HAVE_IPV6) if (pss->ss_family == AF_INET6 && scope_id) { struct sockaddr_in6 *ps6 = (struct sockaddr_in6 *)pss; if (IN6_IS_ADDR_LINKLOCAL(&ps6->sin6_addr) && ps6->sin6_scope_id == 0) { ps6->sin6_scope_id = scope_id; } } #endif freeaddrinfo(res); return true; } /******************************************************************* Map a text hostname or IP address (IPv4 or IPv6) into a struct sockaddr_storage. Address agnostic version. ******************************************************************/ bool interpret_string_addr(struct sockaddr_storage *pss, const char *str, int flags) { return interpret_string_addr_pref(pss, str, flags, false); } /******************************************************************* Map a text hostname or IP address (IPv4 or IPv6) into a struct sockaddr_storage. Version that prefers IPv4. ******************************************************************/ bool interpret_string_addr_prefer_ipv4(struct sockaddr_storage *pss, const char *str, int flags) { return interpret_string_addr_pref(pss, str, flags, true); } /** * Interpret an internet address or name into an IP address in 4 byte form. * RETURNS IN NETWORK BYTE ORDER (big endian). */ uint32_t interpret_addr(const char *str) { uint32_t ret; /* If it's in the form of an IP address then * get the lib to interpret it */ if (is_ipaddress_v4(str)) { struct in_addr dest; if (inet_pton(AF_INET, str, &dest) <= 0) { /* Error - this shouldn't happen ! */ DEBUG(0,("interpret_addr: inet_pton failed " "host %s\n", str)); return 0; } ret = dest.s_addr; /* NETWORK BYTE ORDER ! */ } else { /* Otherwise assume it's a network name of some sort and use getadddrinfo. */ struct addrinfo *res = NULL; struct addrinfo *res_list = NULL; if (!interpret_string_addr_internal(&res_list, str, AI_ADDRCONFIG)) { DEBUG(3,("interpret_addr: Unknown host. %s\n",str)); return 0; } /* Find the first IPv4 address. */ for (res = res_list; res; res = res->ai_next) { if (res->ai_family != AF_INET) { continue; } if (res->ai_addr == NULL) { continue; } break; } if(res == NULL) { DEBUG(3,("interpret_addr: host address is " "invalid for host %s\n",str)); if (res_list) { freeaddrinfo(res_list); } return 0; } memcpy((char *)&ret, &((struct sockaddr_in *)res->ai_addr)->sin_addr.s_addr, sizeof(ret)); if (res_list) { freeaddrinfo(res_list); } } /* This is so bogus - all callers need fixing... JRA. */ if (ret == (uint32_t)-1) { return 0; } return ret; } /** A convenient addition to interpret_addr(). **/ _PUBLIC_ struct in_addr interpret_addr2(const char *str) { struct in_addr ret; uint32_t a = interpret_addr(str); ret.s_addr = a; return ret; } /** Check if an IP is the 0.0.0.0. **/ _PUBLIC_ bool is_zero_ip_v4(struct in_addr ip) { return ip.s_addr == 0; } /** Are two IPs on the same subnet? **/ _PUBLIC_ bool same_net_v4(struct in_addr ip1, struct in_addr ip2, struct in_addr mask) { uint32_t net1,net2,nmask; nmask = ntohl(mask.s_addr); net1 = ntohl(ip1.s_addr); net2 = ntohl(ip2.s_addr); return((net1 & nmask) == (net2 & nmask)); } /** * Return true if a string could be an IPv4 address. */ bool is_ipaddress_v4(const char *str) { int ret = -1; struct in_addr dest; ret = inet_pton(AF_INET, str, &dest); if (ret > 0) { return true; } return false; } /** * Return true if a string could be a IPv6 address. */ bool is_ipaddress_v6(const char *str) { #if defined(HAVE_IPV6) int ret = -1; if (strchr_m(str, ':')) { char addr[INET6_ADDRSTRLEN]; struct in6_addr dest6; const char *sp = str; char *p = strchr_m(str, '%'); /* * Cope with link-local. * This is IP:v6:addr%ifname. */ if (p && (p > str) && (if_nametoindex(p+1) != 0)) { strlcpy(addr, str, MIN(PTR_DIFF(p,str)+1, sizeof(addr))); sp = addr; } ret = inet_pton(AF_INET6, sp, &dest6); if (ret > 0) { return true; } } #endif return false; } /** * Return true if a string could be an IPv4 or IPv6 address. */ bool is_ipaddress(const char *str) { return is_ipaddress_v4(str) || is_ipaddress_v6(str); } /** * Is a sockaddr a broadcast address ? */ bool is_broadcast_addr(const struct sockaddr *pss) { #if defined(HAVE_IPV6) if (pss->sa_family == AF_INET6) { const struct in6_addr *sin6 = &((const struct sockaddr_in6 *)pss)->sin6_addr; return IN6_IS_ADDR_MULTICAST(sin6); } #endif if (pss->sa_family == AF_INET) { uint32_t addr = ntohl(((const struct sockaddr_in *)pss)->sin_addr.s_addr); return addr == INADDR_BROADCAST; } return false; } /** * Check if an IPv7 is 127.0.0.1 */ bool is_loopback_ip_v4(struct in_addr ip) { struct in_addr a; a.s_addr = htonl(INADDR_LOOPBACK); return(ip.s_addr == a.s_addr); } /** * Check if a struct sockaddr is the loopback address. */ bool is_loopback_addr(const struct sockaddr *pss) { #if defined(HAVE_IPV6) if (pss->sa_family == AF_INET6) { const struct in6_addr *pin6 = &((const struct sockaddr_in6 *)pss)->sin6_addr; return IN6_IS_ADDR_LOOPBACK(pin6); } #endif if (pss->sa_family == AF_INET) { const struct in_addr *pin = &((const struct sockaddr_in *)pss)->sin_addr; return is_loopback_ip_v4(*pin); } return false; } /** * Check if a struct sockaddr has an unspecified address. */ bool is_zero_addr(const struct sockaddr_storage *pss) { #if defined(HAVE_IPV6) if (pss->ss_family == AF_INET6) { const struct in6_addr *pin6 = &((const struct sockaddr_in6 *)pss)->sin6_addr; return IN6_IS_ADDR_UNSPECIFIED(pin6); } #endif if (pss->ss_family == AF_INET) { const struct in_addr *pin = &((const struct sockaddr_in *)pss)->sin_addr; return is_zero_ip_v4(*pin); } return false; } /** * Set an IP to 0.0.0.0. */ void zero_ip_v4(struct in_addr *ip) { ZERO_STRUCTP(ip); } bool is_linklocal_addr(const struct sockaddr_storage *pss) { #ifdef HAVE_IPV6 if (pss->ss_family == AF_INET6) { const struct in6_addr *pin6 = &((const struct sockaddr_in6 *)pss)->sin6_addr; return IN6_IS_ADDR_LINKLOCAL(pin6); } #endif if (pss->ss_family == AF_INET) { const struct in_addr *pin = &((const struct sockaddr_in *)pss)->sin_addr; struct in_addr ll_addr; struct in_addr mask_addr; /* 169.254.0.0/16, is link local, see RFC 3927 */ ll_addr.s_addr = 0xa9fe0000; mask_addr.s_addr = 0xffff0000; return same_net_v4(*pin, ll_addr, mask_addr); } return false; } /** * Convert an IPv4 struct in_addr to a struct sockaddr_storage. */ void in_addr_to_sockaddr_storage(struct sockaddr_storage *ss, struct in_addr ip) { struct sockaddr_in *sa = (struct sockaddr_in *)ss; ZERO_STRUCTP(ss); sa->sin_family = AF_INET; sa->sin_addr = ip; } #if defined(HAVE_IPV6) /** * Convert an IPv6 struct in_addr to a struct sockaddr_storage. */ void in6_addr_to_sockaddr_storage(struct sockaddr_storage *ss, struct in6_addr ip) { struct sockaddr_in6 *sa = (struct sockaddr_in6 *)ss; memset(ss, '\0', sizeof(*ss)); sa->sin6_family = AF_INET6; sa->sin6_addr = ip; } #endif /** * Are two IPs on the same subnet? */ bool same_net(const struct sockaddr *ip1, const struct sockaddr *ip2, const struct sockaddr *mask) { if (ip1->sa_family != ip2->sa_family) { /* Never on the same net. */ return false; } #if defined(HAVE_IPV6) if (ip1->sa_family == AF_INET6) { struct sockaddr_in6 ip1_6 = *(const struct sockaddr_in6 *)ip1; struct sockaddr_in6 ip2_6 = *(const struct sockaddr_in6 *)ip2; struct sockaddr_in6 mask_6 = *(const struct sockaddr_in6 *)mask; char *p1 = (char *)&ip1_6.sin6_addr; char *p2 = (char *)&ip2_6.sin6_addr; char *m = (char *)&mask_6.sin6_addr; int i; for (i = 0; i < sizeof(struct in6_addr); i++) { *p1++ &= *m; *p2++ &= *m; m++; } return (memcmp(&ip1_6.sin6_addr, &ip2_6.sin6_addr, sizeof(struct in6_addr)) == 0); } #endif if (ip1->sa_family == AF_INET) { return same_net_v4(((const struct sockaddr_in *)ip1)->sin_addr, ((const struct sockaddr_in *)ip2)->sin_addr, ((const struct sockaddr_in *)mask)->sin_addr); } return false; } /** * Are two sockaddr 's the same family and address ? Ignore port etc. */ bool sockaddr_equal(const struct sockaddr *ip1, const struct sockaddr *ip2) { if (ip1->sa_family != ip2->sa_family) { /* Never the same. */ return false; } #if defined(HAVE_IPV6) if (ip1->sa_family == AF_INET6) { return (memcmp(&((const struct sockaddr_in6 *)ip1)->sin6_addr, &((const struct sockaddr_in6 *)ip2)->sin6_addr, sizeof(struct in6_addr)) == 0); } #endif if (ip1->sa_family == AF_INET) { return (memcmp(&((const struct sockaddr_in *)ip1)->sin_addr, &((const struct sockaddr_in *)ip2)->sin_addr, sizeof(struct in_addr)) == 0); } return false; } /** * Is an IP address the INADDR_ANY or in6addr_any value ? */ bool is_address_any(const struct sockaddr *psa) { #if defined(HAVE_IPV6) if (psa->sa_family == AF_INET6) { const struct sockaddr_in6 *si6 = (const struct sockaddr_in6 *)psa; if (memcmp(&in6addr_any, &si6->sin6_addr, sizeof(in6addr_any)) == 0) { return true; } return false; } #endif if (psa->sa_family == AF_INET) { const struct sockaddr_in *si = (const struct sockaddr_in *)psa; if (si->sin_addr.s_addr == INADDR_ANY) { return true; } return false; } return false; } void set_sockaddr_port(struct sockaddr *psa, uint16_t port) { #if defined(HAVE_IPV6) if (psa->sa_family == AF_INET6) { ((struct sockaddr_in6 *)psa)->sin6_port = htons(port); } #endif if (psa->sa_family == AF_INET) { ((struct sockaddr_in *)psa)->sin_port = htons(port); } } /**************************************************************************** Get a port number in host byte order from a sockaddr_storage. ****************************************************************************/ uint16_t get_sockaddr_port(const struct sockaddr_storage *pss) { uint16_t port = 0; if (pss->ss_family != AF_INET) { #if defined(HAVE_IPV6) /* IPv6 */ const struct sockaddr_in6 *sa6 = (const struct sockaddr_in6 *)pss; port = ntohs(sa6->sin6_port); #endif } else { const struct sockaddr_in *sa = (const struct sockaddr_in *)pss; port = ntohs(sa->sin_port); } return port; } /**************************************************************************** Print out an IPv4 or IPv6 address from a struct sockaddr_storage. ****************************************************************************/ char *print_sockaddr_len(char *dest, size_t destlen, const struct sockaddr *psa, socklen_t psalen) { if (destlen > 0) { dest[0] = '\0'; } (void)sys_getnameinfo(psa, psalen, dest, destlen, NULL, 0, NI_NUMERICHOST); return dest; } /**************************************************************************** Print out an IPv4 or IPv6 address from a struct sockaddr_storage. ****************************************************************************/ char *print_sockaddr(char *dest, size_t destlen, const struct sockaddr_storage *psa) { return print_sockaddr_len(dest, destlen, (const struct sockaddr *)psa, sizeof(struct sockaddr_storage)); } /**************************************************************************** Print out a canonical IPv4 or IPv6 address from a struct sockaddr_storage. ****************************************************************************/ char *print_canonical_sockaddr(TALLOC_CTX *ctx, const struct sockaddr_storage *pss) { char addr[INET6_ADDRSTRLEN]; char *dest = NULL; int ret; /* Linux getnameinfo() man pages says port is unitialized if service name is NULL. */ ret = sys_getnameinfo((const struct sockaddr *)pss, sizeof(struct sockaddr_storage), addr, sizeof(addr), NULL, 0, NI_NUMERICHOST); if (ret != 0) { return NULL; } if (pss->ss_family != AF_INET) { #if defined(HAVE_IPV6) dest = talloc_asprintf(ctx, "[%s]", addr); #else return NULL; #endif } else { dest = talloc_asprintf(ctx, "%s", addr); } return dest; } /**************************************************************************** Return the port number we've bound to on a socket. ****************************************************************************/ int get_socket_port(int fd) { struct sockaddr_storage sa; socklen_t length = sizeof(sa); if (fd == -1) { return -1; } if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) { int level = (errno == ENOTCONN) ? 2 : 0; DEBUG(level, ("getsockname failed. Error was %s\n", strerror(errno))); return -1; } #if defined(HAVE_IPV6) if (sa.ss_family == AF_INET6) { return ntohs(((struct sockaddr_in6 *)&sa)->sin6_port); } #endif if (sa.ss_family == AF_INET) { return ntohs(((struct sockaddr_in *)&sa)->sin_port); } return -1; } /**************************************************************************** Return the string of an IP address (IPv4 or IPv6). ****************************************************************************/ static const char *get_socket_addr(int fd, char *addr_buf, size_t addr_len) { struct sockaddr_storage sa; socklen_t length = sizeof(sa); /* Ok, returning a hard coded IPv4 address * is bogus, but it's just as bogus as a * zero IPv6 address. No good choice here. */ strlcpy(addr_buf, "0.0.0.0", addr_len); if (fd == -1) { return addr_buf; } if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) { DEBUG(0,("getsockname failed. Error was %s\n", strerror(errno) )); return addr_buf; } return print_sockaddr_len(addr_buf, addr_len, (struct sockaddr *)&sa, length); } const char *client_socket_addr(int fd, char *addr, size_t addr_len) { return get_socket_addr(fd, addr, addr_len); } enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON}; typedef struct smb_socket_option { const char *name; int level; int option; int value; int opttype; } smb_socket_option; static const smb_socket_option socket_options[] = { {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL}, {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL}, {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL}, #ifdef TCP_NODELAY {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL}, #endif #ifdef TCP_KEEPCNT {"TCP_KEEPCNT", IPPROTO_TCP, TCP_KEEPCNT, 0, OPT_INT}, #endif #ifdef TCP_KEEPIDLE {"TCP_KEEPIDLE", IPPROTO_TCP, TCP_KEEPIDLE, 0, OPT_INT}, #endif #ifdef TCP_KEEPINTVL {"TCP_KEEPINTVL", IPPROTO_TCP, TCP_KEEPINTVL, 0, OPT_INT}, #endif #ifdef IPTOS_LOWDELAY {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON}, #endif #ifdef IPTOS_THROUGHPUT {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON}, #endif #ifdef SO_REUSEPORT {"SO_REUSEPORT", SOL_SOCKET, SO_REUSEPORT, 0, OPT_BOOL}, #endif #ifdef SO_SNDBUF {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT}, #endif #ifdef SO_RCVBUF {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT}, #endif #ifdef SO_SNDLOWAT {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT}, #endif #ifdef SO_RCVLOWAT {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT}, #endif #ifdef SO_SNDTIMEO {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT}, #endif #ifdef SO_RCVTIMEO {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT}, #endif #ifdef TCP_FASTACK {"TCP_FASTACK", IPPROTO_TCP, TCP_FASTACK, 0, OPT_INT}, #endif #ifdef TCP_QUICKACK {"TCP_QUICKACK", IPPROTO_TCP, TCP_QUICKACK, 0, OPT_BOOL}, #endif #ifdef TCP_NODELAYACK {"TCP_NODELAYACK", IPPROTO_TCP, TCP_NODELAYACK, 0, OPT_BOOL}, #endif #ifdef TCP_KEEPALIVE_THRESHOLD {"TCP_KEEPALIVE_THRESHOLD", IPPROTO_TCP, TCP_KEEPALIVE_THRESHOLD, 0, OPT_INT}, #endif #ifdef TCP_KEEPALIVE_ABORT_THRESHOLD {"TCP_KEEPALIVE_ABORT_THRESHOLD", IPPROTO_TCP, TCP_KEEPALIVE_ABORT_THRESHOLD, 0, OPT_INT}, #endif {NULL,0,0,0,0}}; /**************************************************************************** Print socket options. ****************************************************************************/ static void print_socket_options(int s) { int value; socklen_t vlen = 4; const smb_socket_option *p = &socket_options[0]; /* wrapped in if statement to prevent streams * leak in SCO Openserver 5.0 */ /* reported on samba-technical --jerry */ if ( DEBUGLEVEL >= 5 ) { DEBUG(5,("Socket options:\n")); for (; p->name != NULL; p++) { if (getsockopt(s, p->level, p->option, (void *)&value, &vlen) == -1) { DEBUGADD(5,("\tCould not test socket option %s.\n", p->name)); } else { DEBUGADD(5,("\t%s = %d\n", p->name,value)); } } } } /**************************************************************************** Set user socket options. ****************************************************************************/ void set_socket_options(int fd, const char *options) { TALLOC_CTX *ctx = talloc_new(NULL); char *tok; while (next_token_talloc(ctx, &options, &tok," \t,")) { int ret=0,i; int value = 1; char *p; bool got_value = false; if ((p = strchr_m(tok,'='))) { *p = 0; value = atoi(p+1); got_value = true; } for (i=0;socket_options[i].name;i++) if (strequal(socket_options[i].name,tok)) break; if (!socket_options[i].name) { DEBUG(0,("Unknown socket option %s\n",tok)); continue; } switch (socket_options[i].opttype) { case OPT_BOOL: case OPT_INT: ret = setsockopt(fd,socket_options[i].level, socket_options[i].option, (char *)&value,sizeof(int)); break; case OPT_ON: if (got_value) DEBUG(0,("syntax error - %s " "does not take a value\n",tok)); { int on = socket_options[i].value; ret = setsockopt(fd,socket_options[i].level, socket_options[i].option, (char *)&on,sizeof(int)); } break; } if (ret != 0) { /* be aware that some systems like Solaris return * EINVAL to a setsockopt() call when the client * sent a RST previously - no need to worry */ DEBUG(2,("Failed to set socket option %s (Error %s)\n", tok, strerror(errno) )); } } TALLOC_FREE(ctx); print_socket_options(fd); }