/* Unix SMB/CIFS implementation. Samba utility functions Copyright (C) Andrew Tridgell 1992-1998 Copyright (C) Tim Potter 2000-2001 Copyright (C) Jeremy Allison 1992-2007 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" /**************************************************************************** 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 an IPv4 or IPv6 address. ****************************************************************************/ bool is_ipaddress(const char *str) { int ret = -1; #if defined(HAVE_IPV6) 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, addr, &dest6); if (ret > 0) { return true; } } #endif return is_ipaddress_v4(str); } /**************************************************************************** Is a sockaddr_storage a broadcast address ? ****************************************************************************/ bool is_broadcast_addr(const struct sockaddr_storage *pss) { #if defined(HAVE_IPV6) if (pss->ss_family == AF_INET6) { const struct in6_addr *sin6 = &((const struct sockaddr_in6 *)pss)->sin6_addr; return IN6_IS_ADDR_MULTICAST(sin6); } #endif if (pss->ss_family == AF_INET) { uint32_t addr = ntohl(((const struct sockaddr_in *)pss)->sin_addr.s_addr); return addr == INADDR_BROADCAST; } return false; } /******************************************************************* Wrap getaddrinfo... ******************************************************************/ static bool interpret_string_addr_internal(struct addrinfo **ppres, const char *str, int flags) { int ret; struct addrinfo hints; memset(&hints, '\0', sizeof(hints)); /* By default make sure it supports TCP. */ hints.ai_socktype = SOCK_STREAM; hints.ai_flags = flags; ret = getaddrinfo(str, NULL, &hints, ppres); if (ret) { DEBUG(3,("interpret_string_addr_interal: getaddrinfo failed " "for name %s [%s]\n", str, gai_strerror(ret) )); return false; } return true; } /**************************************************************************** Interpret an internet address or name into an IP address in 4 byte form. RETURNS IN NETWORK BYTE ORDER (big endian). ****************************************************************************/ uint32 interpret_addr(const char *str) { uint32 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; } putip((char *)&ret, &((struct sockaddr_in *)res->ai_addr)->sin_addr.s_addr); if (res_list) { freeaddrinfo(res_list); } } /* This is so bogus - all callers need fixing... JRA. */ if (ret == (uint32)-1) { return 0; } return ret; } /******************************************************************* A convenient addition to interpret_addr(). ******************************************************************/ struct in_addr *interpret_addr2(struct in_addr *ip, const char *str) { uint32 a = interpret_addr(str); ip->s_addr = a; return ip; } /******************************************************************* Map a text hostname or IP address (IPv4 or IPv6) into a struct sockaddr_storage. ******************************************************************/ bool interpret_string_addr(struct sockaddr_storage *pss, const char *str, int flags) { char addr[INET6_ADDRSTRLEN]; struct addrinfo *res = NULL; #if defined(HAVE_IPV6) unsigned int scope_id = 0; 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_addr(pss); if (!interpret_string_addr_internal(&res, str, flags|AI_ADDRCONFIG)) { return false; } if (!res) { return false; } /* 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; } /******************************************************************* 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_storage is the loopback address. ******************************************************************/ bool is_loopback_addr(const struct sockaddr_storage *pss) { #if defined(HAVE_IPV6) if (pss->ss_family == AF_INET6) { struct in6_addr *pin6 = &((struct sockaddr_in6 *)pss)->sin6_addr; return IN6_IS_ADDR_LOOPBACK(pin6); } #endif if (pss->ss_family == AF_INET) { struct in_addr *pin = &((struct sockaddr_in *)pss)->sin_addr; return is_loopback_ip_v4(*pin); } return false; } /******************************************************************* Check if an IPv4 is 0.0.0.0. ******************************************************************/ bool is_zero_ip_v4(struct in_addr ip) { uint32 a; putip((char *)&a,(char *)&ip); return(a == 0); } /******************************************************************* Check if a struct sockaddr_storage has an unspecified address. ******************************************************************/ bool is_zero_addr(const struct sockaddr_storage *pss) { #if defined(HAVE_IPV6) if (pss->ss_family == AF_INET6) { struct in6_addr *pin6 = &((struct sockaddr_in6 *)pss)->sin6_addr; return IN6_IS_ADDR_UNSPECIFIED(pin6); } #endif if (pss->ss_family == AF_INET) { struct in_addr *pin = &((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) { memset(ip, '\0', sizeof(struct in_addr)); } /******************************************************************* Set an address to INADDR_ANY. ******************************************************************/ void zero_addr(struct sockaddr_storage *pss) { memset(pss, '\0', sizeof(*pss)); /* Ensure we're at least a valid sockaddr-storage. */ pss->ss_family = AF_INET; } /******************************************************************* Are two IPs on the same subnet - IPv4 version ? ********************************************************************/ bool same_net_v4(struct in_addr ip1,struct in_addr ip2,struct in_addr mask) { uint32 net1,net2,nmask; nmask = ntohl(mask.s_addr); net1 = ntohl(ip1.s_addr); net2 = ntohl(ip2.s_addr); return((net1 & nmask) == (net2 & nmask)); } /******************************************************************* 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; memset(ss, '\0', sizeof(*ss)); ss->ss_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)); ss->ss_family = AF_INET6; sa->sin6_addr = ip; } #endif /******************************************************************* Are two IPs on the same subnet? ********************************************************************/ bool same_net(const struct sockaddr_storage *ip1, const struct sockaddr_storage *ip2, const struct sockaddr_storage *mask) { if (ip1->ss_family != ip2->ss_family) { /* Never on the same net. */ return false; } #if defined(HAVE_IPV6) if (ip1->ss_family == AF_INET6) { struct sockaddr_in6 ip1_6 = *(struct sockaddr_in6 *)ip1; struct sockaddr_in6 ip2_6 = *(struct sockaddr_in6 *)ip2; struct sockaddr_in6 mask_6 = *(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->ss_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_storage's the same family and address ? Ignore port etc. ********************************************************************/ bool addr_equal(const struct sockaddr_storage *ip1, const struct sockaddr_storage *ip2) { if (ip1->ss_family != ip2->ss_family) { /* Never the same. */ return false; } #if defined(HAVE_IPV6) if (ip1->ss_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->ss_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_storage *psa) { #if defined(HAVE_IPV6) if (psa->ss_family == AF_INET6) { struct sockaddr_in6 *si6 = (struct sockaddr_in6 *)psa; if (memcmp(&in6addr_any, &si6->sin6_addr, sizeof(in6addr_any)) == 0) { return true; } return false; } #endif if (psa->ss_family == AF_INET) { struct sockaddr_in *si = (struct sockaddr_in *)psa; if (si->sin_addr.s_addr == INADDR_ANY) { return true; } return false; } return false; } /**************************************************************************** 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. ****************************************************************************/ static char *print_sockaddr_len(char *dest, size_t destlen, const struct sockaddr_storage *psa, socklen_t psalen) { if (destlen > 0) { dest[0] = '\0'; } (void)sys_getnameinfo((const struct sockaddr *)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, 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; ret = sys_getnameinfo((const struct sockaddr *)pss, sizeof(struct sockaddr_storage), addr, sizeof(addr), NULL, 0, NI_NUMERICHOST); if (ret) { return NULL; } if (pss->ss_family != AF_INET) { #if defined(HAVE_IPV6) /* IPv6 */ const struct sockaddr_in6 *sa6 = (const struct sockaddr_in6 *)pss; uint16_t port = ntohs(sa6->sin6_port); if (port) { dest = talloc_asprintf(ctx, "[%s]:%d", addr, (unsigned int)port); } else { dest = talloc_asprintf(ctx, "[%s]", addr); } #else return NULL; #endif } else { const struct sockaddr_in *sa = (const struct sockaddr_in *)pss; uint16_t port = ntohs(sa->sin_port); if (port) { dest = talloc_asprintf(ctx, "%s:%d", addr, (unsigned int)port); } else { dest = talloc_asprintf(ctx, "%s", addr); } } return dest; } /**************************************************************************** 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, &sa, length); } #if 0 /* Not currently used. JRA. */ /**************************************************************************** Return the port number we've bound to on a socket. ****************************************************************************/ static 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) { DEBUG(0,("getpeername 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; } #endif void set_sockaddr_port(struct sockaddr_storage *psa, uint16 port) { #if defined(HAVE_IPV6) if (psa->ss_family == AF_INET6) { ((struct sockaddr_in6 *)psa)->sin6_port = htons(port); } #endif if (psa->ss_family == AF_INET) { ((struct sockaddr_in *)psa)->sin_port = htons(port); } } const char *client_name(int fd) { return get_peer_name(fd,false); } const char *client_addr(int fd, char *addr, size_t addrlen) { return get_peer_addr(fd,addr,addrlen); } const char *client_socket_addr(int fd, char *addr, size_t addr_len) { return get_socket_addr(fd, addr, addr_len); } #if 0 /* Not currently used. JRA. */ int client_socket_port(int fd) { return get_socket_port(fd); } #endif /**************************************************************************** Accessor functions to make thread-safe code easier later... ****************************************************************************/ void set_smb_read_error(enum smb_read_errors *pre, enum smb_read_errors newerr) { if (pre) { *pre = newerr; } } void cond_set_smb_read_error(enum smb_read_errors *pre, enum smb_read_errors newerr) { if (pre && *pre == SMB_READ_OK) { *pre = newerr; } } /**************************************************************************** Determine if a file descriptor is in fact a socket. ****************************************************************************/ bool is_a_socket(int fd) { int v; socklen_t l; l = sizeof(int); return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0); } 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 {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 ) { for (; p->name != NULL; p++) { if (getsockopt(s, p->level, p->option, (void *)&value, &vlen) == -1) { DEBUG(5,("Could not test socket option %s.\n", p->name)); } else { DEBUG(5,("socket option %s = %d\n", p->name,value)); } } } } /**************************************************************************** Set user socket options. ****************************************************************************/ void set_socket_options(int fd, const char *options) { TALLOC_CTX *ctx = talloc_stackframe(); 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) { DEBUG(0,("Failed to set socket option %s (Error %s)\n", tok, strerror(errno) )); } } TALLOC_FREE(ctx); print_socket_options(fd); } /**************************************************************************** Read from a socket. ****************************************************************************/ ssize_t read_udp_v4_socket(int fd, char *buf, size_t len, struct sockaddr_storage *psa) { ssize_t ret; socklen_t socklen = sizeof(*psa); struct sockaddr_in *si = (struct sockaddr_in *)psa; memset((char *)psa,'\0',socklen); ret = (ssize_t)sys_recvfrom(fd,buf,len,0, (struct sockaddr *)psa,&socklen); if (ret <= 0) { /* Don't print a low debug error for a non-blocking socket. */ if (errno == EAGAIN) { DEBUG(10,("read_udp_v4_socket: returned EAGAIN\n")); } else { DEBUG(2,("read_udp_v4_socket: failed. errno=%s\n", strerror(errno))); } return 0; } if (psa->ss_family != AF_INET) { DEBUG(2,("read_udp_v4_socket: invalid address family %d " "(not IPv4)\n", (int)psa->ss_family)); return 0; } DEBUG(10,("read_udp_v4_socket: ip %s port %d read: %lu\n", inet_ntoa(si->sin_addr), si->sin_port, (unsigned long)ret)); return ret; } /**************************************************************************** Read data from a socket with a timout in msec. mincount = if timeout, minimum to read before returning maxcount = number to be read. time_out = timeout in milliseconds ****************************************************************************/ ssize_t read_socket_with_timeout(int fd, char *buf, size_t mincnt, size_t maxcnt, unsigned int time_out, enum smb_read_errors *pre) { fd_set fds; int selrtn; ssize_t readret; size_t nread = 0; struct timeval timeout; char addr[INET6_ADDRSTRLEN]; /* just checking .... */ if (maxcnt <= 0) return(0); set_smb_read_error(pre,SMB_READ_OK); /* Blocking read */ if (time_out == 0) { if (mincnt == 0) { mincnt = maxcnt; } while (nread < mincnt) { readret = sys_read(fd, buf + nread, maxcnt - nread); if (readret == 0) { DEBUG(5,("read_socket_with_timeout: " "blocking read. EOF from client.\n")); set_smb_read_error(pre,SMB_READ_EOF); return -1; } if (readret == -1) { if (fd == get_client_fd()) { /* Try and give an error message * saying what client failed. */ DEBUG(0,("read_socket_with_timeout: " "client %s read error = %s.\n", get_peer_addr(fd,addr,sizeof(addr)), strerror(errno) )); } else { DEBUG(0,("read_socket_with_timeout: " "read error = %s.\n", strerror(errno) )); } set_smb_read_error(pre,SMB_READ_ERROR); return -1; } nread += readret; } return((ssize_t)nread); } /* Most difficult - timeout read */ /* If this is ever called on a disk file and mincnt is greater then the filesize then system performance will suffer severely as select always returns true on disk files */ /* Set initial timeout */ timeout.tv_sec = (time_t)(time_out / 1000); timeout.tv_usec = (long)(1000 * (time_out % 1000)); for (nread=0; nread < mincnt; ) { FD_ZERO(&fds); FD_SET(fd,&fds); selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout); /* Check if error */ if (selrtn == -1) { /* something is wrong. Maybe the socket is dead? */ if (fd == get_client_fd()) { /* Try and give an error message saying * what client failed. */ DEBUG(0,("read_socket_with_timeout: timeout " "read for client %s. select error = %s.\n", get_peer_addr(fd,addr,sizeof(addr)), strerror(errno) )); } else { DEBUG(0,("read_socket_with_timeout: timeout " "read. select error = %s.\n", strerror(errno) )); } set_smb_read_error(pre,SMB_READ_ERROR); return -1; } /* Did we timeout ? */ if (selrtn == 0) { DEBUG(10,("read_socket_with_timeout: timeout read. " "select timed out.\n")); set_smb_read_error(pre,SMB_READ_TIMEOUT); return -1; } readret = sys_read(fd, buf+nread, maxcnt-nread); if (readret == 0) { /* we got EOF on the file descriptor */ DEBUG(5,("read_socket_with_timeout: timeout read. " "EOF from client.\n")); set_smb_read_error(pre,SMB_READ_EOF); return -1; } if (readret == -1) { /* the descriptor is probably dead */ if (fd == get_client_fd()) { /* Try and give an error message * saying what client failed. */ DEBUG(0,("read_socket_with_timeout: timeout " "read to client %s. read error = %s.\n", get_peer_addr(fd,addr,sizeof(addr)), strerror(errno) )); } else { DEBUG(0,("read_socket_with_timeout: timeout " "read. read error = %s.\n", strerror(errno) )); } set_smb_read_error(pre,SMB_READ_ERROR); return -1; } nread += readret; } /* Return the number we got */ return (ssize_t)nread; } /**************************************************************************** Read data from the client, reading exactly N bytes. ****************************************************************************/ ssize_t read_data(int fd,char *buffer,size_t N, enum smb_read_errors *pre) { return read_socket_with_timeout(fd, buffer, N, N, 0, pre); } /**************************************************************************** Write data to a fd. ****************************************************************************/ ssize_t write_data(int fd, const char *buffer, size_t N) { size_t total=0; ssize_t ret; char addr[INET6_ADDRSTRLEN]; while (total < N) { ret = sys_write(fd,buffer + total,N - total); if (ret == -1) { if (fd == get_client_fd()) { /* Try and give an error message saying * what client failed. */ DEBUG(0,("write_data: write failure in " "writing to client %s. Error %s\n", get_peer_addr(fd,addr,sizeof(addr)), strerror(errno) )); } else { DEBUG(0,("write_data: write failure. " "Error = %s\n", strerror(errno) )); } return -1; } if (ret == 0) { return total; } total += ret; } return (ssize_t)total; } /**************************************************************************** Send a keepalive packet (rfc1002). ****************************************************************************/ bool send_keepalive(int client) { unsigned char buf[4]; buf[0] = SMBkeepalive; buf[1] = buf[2] = buf[3] = 0; return(write_data(client,(char *)buf,4) == 4); } /**************************************************************************** Read 4 bytes of a smb packet and return the smb length of the packet. Store the result in the buffer. This version of the function will return a length of zero on receiving a keepalive packet. Timeout is in milliseconds. ****************************************************************************/ ssize_t read_smb_length_return_keepalive(int fd, char *inbuf, unsigned int timeout, enum smb_read_errors *pre) { ssize_t len=0; int msg_type; if (read_socket_with_timeout(fd, inbuf, 4, 4, timeout, pre) != 4) { return -1; } len = smb_len(inbuf); msg_type = CVAL(inbuf,0); if (msg_type == SMBkeepalive) { DEBUG(5,("Got keepalive packet\n")); } DEBUG(10,("got smb length of %lu\n",(unsigned long)len)); return len; } /**************************************************************************** Read 4 bytes of a smb packet and return the smb length of the packet. Store the result in the buffer. This version of the function will never return a session keepalive (length of zero). Timeout is in milliseconds. ****************************************************************************/ ssize_t read_smb_length(int fd, char *inbuf, unsigned int timeout, enum smb_read_errors *pre) { ssize_t len; uint8_t msgtype = SMBkeepalive; while (msgtype == SMBkeepalive) { len = read_smb_length_return_keepalive(fd, inbuf, timeout, pre); if (len < 0) { return len; } msgtype = CVAL(inbuf, 0); } DEBUG(10,("read_smb_length: got smb length of %lu\n", (unsigned long)len)); return len; } /**************************************************************************** Read an smb from a fd. Note that the buffer *MUST* be of size BUFFER_SIZE+SAFETY_MARGIN. The timeout is in milliseconds. This function will return on receipt of a session keepalive packet. maxlen is the max number of bytes to return, not including the 4 byte length. If zero it means BUFFER_SIZE+SAFETY_MARGIN limit. Doesn't check the MAC on signed packets. ****************************************************************************/ ssize_t receive_smb_raw(int fd, char *buffer, unsigned int timeout, size_t maxlen, enum smb_read_errors *pre) { ssize_t len,ret; set_smb_read_error(pre,SMB_READ_OK); len = read_smb_length_return_keepalive(fd,buffer,timeout,pre); if (len < 0) { DEBUG(10,("receive_smb_raw: length < 0!\n")); /* * Correct fix. smb_read_error may have already been * set. Only set it here if not already set. Global * variables still suck :-). JRA. */ cond_set_smb_read_error(pre,SMB_READ_ERROR); return -1; } /* * A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes * of header. Don't print the error if this fits.... JRA. */ if (len > (BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE)) { DEBUG(0,("Invalid packet length! (%lu bytes).\n", (unsigned long)len)); if (len > BUFFER_SIZE + (SAFETY_MARGIN/2)) { /* * Correct fix. smb_read_error may have already been * set. Only set it here if not already set. Global * variables still suck :-). JRA. */ cond_set_smb_read_error(pre,SMB_READ_ERROR); return -1; } } if(len > 0) { if (maxlen) { len = MIN(len,maxlen); } ret = read_socket_with_timeout(fd, buffer+4, len, len, timeout, pre); if (ret != len) { cond_set_smb_read_error(pre,SMB_READ_ERROR); return -1; } /* not all of samba3 properly checks for packet-termination * of strings. This ensures that we don't run off into * empty space. */ SSVAL(buffer+4,len, 0); } return len; } /**************************************************************************** Open a socket of the specified type, port, and address for incoming data. ****************************************************************************/ int open_socket_in(int type, uint16_t port, int dlevel, const struct sockaddr_storage *psock, bool rebind) { struct sockaddr_storage sock; int res; socklen_t slen = sizeof(struct sockaddr_in); sock = *psock; #if defined(HAVE_IPV6) if (sock.ss_family == AF_INET6) { ((struct sockaddr_in6 *)&sock)->sin6_port = htons(port); slen = sizeof(struct sockaddr_in6); } #endif if (sock.ss_family == AF_INET) { ((struct sockaddr_in *)&sock)->sin_port = htons(port); } res = socket(sock.ss_family, type, 0 ); if( res == -1 ) { if( DEBUGLVL(0) ) { dbgtext( "open_socket_in(): socket() call failed: " ); dbgtext( "%s\n", strerror( errno ) ); } return -1; } /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */ { int val = rebind ? 1 : 0; if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR, (char *)&val,sizeof(val)) == -1 ) { if( DEBUGLVL( dlevel ) ) { dbgtext( "open_socket_in(): setsockopt: " ); dbgtext( "SO_REUSEADDR = %s ", val?"true":"false" ); dbgtext( "on port %d failed ", port ); dbgtext( "with error = %s\n", strerror(errno) ); } } #ifdef SO_REUSEPORT if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT, (char *)&val,sizeof(val)) == -1 ) { if( DEBUGLVL( dlevel ) ) { dbgtext( "open_socket_in(): setsockopt: "); dbgtext( "SO_REUSEPORT = %s ", val?"true":"false"); dbgtext( "on port %d failed ", port); dbgtext( "with error = %s\n", strerror(errno)); } } #endif /* SO_REUSEPORT */ } /* now we've got a socket - we need to bind it */ if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) { if( DEBUGLVL(dlevel) && (port == SMB_PORT1 || port == SMB_PORT2 || port == NMB_PORT) ) { char addr[INET6_ADDRSTRLEN]; print_sockaddr(addr, sizeof(addr), &sock); dbgtext( "bind failed on port %d ", port); dbgtext( "socket_addr = %s.\n", addr); dbgtext( "Error = %s\n", strerror(errno)); } close(res); return -1; } DEBUG( 10, ( "bind succeeded on port %d\n", port ) ); return( res ); } /**************************************************************************** Create an outgoing socket. timeout is in milliseconds. **************************************************************************/ int open_socket_out(int type, const struct sockaddr_storage *pss, uint16_t port, int timeout) { char addr[INET6_ADDRSTRLEN]; struct sockaddr_storage sock_out = *pss; int res,ret; int connect_loop = 10; int increment = 10; /* create a socket to write to */ res = socket(pss->ss_family, type, 0); if (res == -1) { DEBUG(0,("socket error (%s)\n", strerror(errno))); return -1; } if (type != SOCK_STREAM) { return res; } #if defined(HAVE_IPV6) if (pss->ss_family == AF_INET6) { struct sockaddr_in6 *psa6 = (struct sockaddr_in6 *)&sock_out; psa6->sin6_port = htons(port); if (psa6->sin6_scope_id == 0 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) { setup_linklocal_scope_id(&sock_out); } } #endif if (pss->ss_family == AF_INET) { struct sockaddr_in *psa = (struct sockaddr_in *)&sock_out; psa->sin_port = htons(port); } /* set it non-blocking */ set_blocking(res,false); print_sockaddr(addr, sizeof(addr), &sock_out); DEBUG(3,("Connecting to %s at port %u\n", addr, (unsigned int)port)); /* and connect it to the destination */ connect_again: ret = sys_connect(res, (struct sockaddr *)&sock_out); /* Some systems return EAGAIN when they mean EINPROGRESS */ if (ret < 0 && (errno == EINPROGRESS || errno == EALREADY || errno == EAGAIN) && (connect_loop < timeout) ) { smb_msleep(connect_loop); timeout -= connect_loop; connect_loop += increment; if (increment < 250) { /* After 8 rounds we end up at a max of 255 msec */ increment *= 1.5; } goto connect_again; } if (ret < 0 && (errno == EINPROGRESS || errno == EALREADY || errno == EAGAIN)) { DEBUG(1,("timeout connecting to %s:%u\n", addr, (unsigned int)port)); close(res); return -1; } #ifdef EISCONN if (ret < 0 && errno == EISCONN) { errno = 0; ret = 0; } #endif if (ret < 0) { DEBUG(2,("error connecting to %s:%d (%s)\n", addr, (unsigned int)port, strerror(errno))); close(res); return -1; } /* set it blocking again */ set_blocking(res,true); return res; } /**************************************************************************** Create an outgoing TCP socket to any of the addrs. This is for simultaneous connects to port 445 and 139 of a host or even a variety of DC's all of which are equivalent for our purposes. **************************************************************************/ bool open_any_socket_out(struct sockaddr_storage *addrs, int num_addrs, int timeout, int *fd_index, int *fd) { int i, resulting_index, res; int *sockets; bool good_connect; fd_set r_fds, wr_fds; struct timeval tv; int maxfd; int connect_loop = 10000; /* 10 milliseconds */ timeout *= 1000; /* convert to microseconds */ sockets = SMB_MALLOC_ARRAY(int, num_addrs); if (sockets == NULL) return false; resulting_index = -1; for (i=0; imaxfd) maxfd = sockets[i]; } tv.tv_sec = 0; tv.tv_usec = connect_loop; res = sys_select_intr(maxfd+1, &r_fds, &wr_fds, NULL, &tv); if (res < 0) goto done; if (res == 0) goto next_round; for (i=0; i timeout) connect_loop = timeout; goto connect_again; done: for (i=0; i= 0) close(sockets[i]); } if (resulting_index >= 0) { *fd_index = resulting_index; *fd = sockets[*fd_index]; set_blocking(*fd, true); } free(sockets); return (resulting_index >= 0); } /**************************************************************************** Open a connected UDP socket to host on port **************************************************************************/ int open_udp_socket(const char *host, int port) { int type = SOCK_DGRAM; struct sockaddr_in sock_out; int res; struct in_addr addr; (void)interpret_addr2(&addr, host); res = socket(PF_INET, type, 0); if (res == -1) { return -1; } memset((char *)&sock_out,'\0',sizeof(sock_out)); putip((char *)&sock_out.sin_addr,(char *)&addr); sock_out.sin_port = htons(port); sock_out.sin_family = PF_INET; if (sys_connect(res,(struct sockaddr *)&sock_out)) { close(res); return -1; } return res; } /******************************************************************* Return the IP addr of the remote end of a socket as a string. Optionally return the struct sockaddr_storage. ******************************************************************/ static const char *get_peer_addr_internal(int fd, char *addr_buf, size_t addr_buf_len, struct sockaddr_storage *pss, socklen_t *plength) { struct sockaddr_storage ss; socklen_t length = sizeof(ss); strlcpy(addr_buf,"0.0.0.0",addr_buf_len); if (fd == -1) { return addr_buf; } if (pss == NULL) { pss = &ss; } if (plength == NULL) { plength = &length; } if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) { DEBUG(0,("getpeername failed. Error was %s\n", strerror(errno) )); return addr_buf; } print_sockaddr_len(addr_buf, addr_buf_len, pss, *plength); return addr_buf; } /******************************************************************* Matchname - determine if host name matches IP address. Used to confirm a hostname lookup to prevent spoof attacks. ******************************************************************/ static bool matchname(const char *remotehost, const struct sockaddr_storage *pss, socklen_t len) { struct addrinfo *res = NULL; struct addrinfo *ailist = NULL; char addr_buf[INET6_ADDRSTRLEN]; bool ret = interpret_string_addr_internal(&ailist, remotehost, AI_ADDRCONFIG|AI_CANONNAME); if (!ret || ailist == NULL) { DEBUG(3,("matchname: getaddrinfo failed for " "name %s [%s]\n", remotehost, gai_strerror(ret) )); return false; } /* * Make sure that getaddrinfo() returns the "correct" host name. */ if (ailist->ai_canonname == NULL || (!strequal(remotehost, ailist->ai_canonname) && !strequal(remotehost, "localhost"))) { DEBUG(0,("matchname: host name/name mismatch: %s != %s\n", remotehost, ailist->ai_canonname ? ailist->ai_canonname : "(NULL)")); freeaddrinfo(ailist); return false; } /* Look up the host address in the address list we just got. */ for (res = ailist; res; res = res->ai_next) { if (!res->ai_addr) { continue; } if (addr_equal((const struct sockaddr_storage *)res->ai_addr, pss)) { freeaddrinfo(ailist); return true; } } /* * The host name does not map to the original host address. Perhaps * someone has compromised a name server. More likely someone botched * it, but that could be dangerous, too. */ DEBUG(0,("matchname: host name/address mismatch: %s != %s\n", print_sockaddr_len(addr_buf, sizeof(addr_buf), pss, len), ailist->ai_canonname ? ailist->ai_canonname : "(NULL)")); if (ailist) { freeaddrinfo(ailist); } return false; } /******************************************************************* Deal with the singleton cache. ******************************************************************/ struct name_addr_pair { struct sockaddr_storage ss; const char *name; }; /******************************************************************* Lookup a name/addr pair. Returns memory allocated from memcache. ******************************************************************/ static bool lookup_nc(struct name_addr_pair *nc) { DATA_BLOB tmp; ZERO_STRUCTP(nc); if (!memcache_lookup( NULL, SINGLETON_CACHE, data_blob_string_const("get_peer_name"), &tmp)) { return false; } memcpy(&nc->ss, tmp.data, sizeof(nc->ss)); nc->name = (const char *)tmp.data + sizeof(nc->ss); return true; } /******************************************************************* Save a name/addr pair. ******************************************************************/ static void store_nc(const struct name_addr_pair *nc) { DATA_BLOB tmp; size_t namelen = strlen(nc->name); tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1); if (!tmp.data) { return; } memcpy(tmp.data, &nc->ss, sizeof(nc->ss)); memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1); memcache_add(NULL, SINGLETON_CACHE, data_blob_string_const("get_peer_name"), tmp); data_blob_free(&tmp); } /******************************************************************* Return the DNS name of the remote end of a socket. ******************************************************************/ const char *get_peer_name(int fd, bool force_lookup) { struct name_addr_pair nc; char addr_buf[INET6_ADDRSTRLEN]; struct sockaddr_storage ss; socklen_t length = sizeof(ss); const char *p; int ret; char name_buf[MAX_DNS_NAME_LENGTH]; char tmp_name[MAX_DNS_NAME_LENGTH]; /* reverse lookups can be *very* expensive, and in many situations won't work because many networks don't link dhcp with dns. To avoid the delay we avoid the lookup if possible */ if (!lp_hostname_lookups() && (force_lookup == false)) { length = sizeof(nc.ss); nc.name = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf), &nc.ss, &length); store_nc(&nc); lookup_nc(&nc); return nc.name ? nc.name : "UNKNOWN"; } lookup_nc(&nc); memset(&ss, '\0', sizeof(ss)); p = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf), &ss, &length); /* it might be the same as the last one - save some DNS work */ if (addr_equal(&ss, &nc.ss)) { return nc.name ? nc.name : "UNKNOWN"; } /* Not the same. We need to lookup. */ if (fd == -1) { return "UNKNOWN"; } /* Look up the remote host name. */ ret = sys_getnameinfo((struct sockaddr *)&ss, length, name_buf, sizeof(name_buf), NULL, 0, 0); if (ret) { DEBUG(1,("get_peer_name: getnameinfo failed " "for %s with error %s\n", p, gai_strerror(ret))); strlcpy(name_buf, p, sizeof(name_buf)); } else { if (!matchname(name_buf, &ss, length)) { DEBUG(0,("Matchname failed on %s %s\n",name_buf,p)); strlcpy(name_buf,"UNKNOWN",sizeof(name_buf)); } } /* can't pass the same source and dest strings in when you use --enable-developer or the clobber_region() call will get you */ strlcpy(tmp_name, name_buf, sizeof(tmp_name)); alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf)); if (strstr(name_buf,"..")) { strlcpy(name_buf, "UNKNOWN", sizeof(name_buf)); } nc.name = name_buf; nc.ss = ss; store_nc(&nc); lookup_nc(&nc); return nc.name ? nc.name : "UNKNOWN"; } /******************************************************************* Return the IP addr of the remote end of a socket as a string. ******************************************************************/ const char *get_peer_addr(int fd, char *addr, size_t addr_len) { return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL); } /******************************************************************* Create protected unix domain socket. Some unixes cannot set permissions on a ux-dom-sock, so we have to make sure that the directory contains the protection permissions instead. ******************************************************************/ int create_pipe_sock(const char *socket_dir, const char *socket_name, mode_t dir_perms) { #ifdef HAVE_UNIXSOCKET struct sockaddr_un sunaddr; struct stat st; int sock; mode_t old_umask; char *path = NULL; old_umask = umask(0); /* Create the socket directory or reuse the existing one */ if (lstat(socket_dir, &st) == -1) { if (errno == ENOENT) { /* Create directory */ if (mkdir(socket_dir, dir_perms) == -1) { DEBUG(0, ("error creating socket directory " "%s: %s\n", socket_dir, strerror(errno))); goto out_umask; } } else { DEBUG(0, ("lstat failed on socket directory %s: %s\n", socket_dir, strerror(errno))); goto out_umask; } } else { /* Check ownership and permission on existing directory */ if (!S_ISDIR(st.st_mode)) { DEBUG(0, ("socket directory %s isn't a directory\n", socket_dir)); goto out_umask; } if ((st.st_uid != sec_initial_uid()) || ((st.st_mode & 0777) != dir_perms)) { DEBUG(0, ("invalid permissions on socket directory " "%s\n", socket_dir)); goto out_umask; } } /* Create the socket file */ sock = socket(AF_UNIX, SOCK_STREAM, 0); if (sock == -1) { DEBUG(0, ("create_pipe_sock: socket error %s\n", strerror(errno) )); goto out_close; } asprintf(&path, "%s/%s", socket_dir, socket_name); if (!path) { goto out_close; } unlink(path); memset(&sunaddr, 0, sizeof(sunaddr)); sunaddr.sun_family = AF_UNIX; strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path)); if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) { DEBUG(0, ("bind failed on pipe socket %s: %s\n", path, strerror(errno))); goto out_close; } if (listen(sock, 5) == -1) { DEBUG(0, ("listen failed on pipe socket %s: %s\n", path, strerror(errno))); goto out_close; } SAFE_FREE(path); umask(old_umask); return sock; out_close: SAFE_FREE(path); close(sock); out_umask: umask(old_umask); return -1; #else DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n")); return -1; #endif /* HAVE_UNIXSOCKET */ } /**************************************************************************** Get my own canonical name, including domain. ****************************************************************************/ const char *get_mydnsfullname(void) { struct addrinfo *res = NULL; char my_hostname[HOST_NAME_MAX]; bool ret; DATA_BLOB tmp; if (memcache_lookup(NULL, SINGLETON_CACHE, data_blob_string_const("get_mydnsfullname"), &tmp)) { SMB_ASSERT(tmp.length > 0); return (const char *)tmp.data; } /* get my host name */ if (gethostname(my_hostname, sizeof(my_hostname)) == -1) { DEBUG(0,("get_mydnsfullname: gethostname failed\n")); return NULL; } /* Ensure null termination. */ my_hostname[sizeof(my_hostname)-1] = '\0'; ret = interpret_string_addr_internal(&res, my_hostname, AI_ADDRCONFIG|AI_CANONNAME); if (!ret || res == NULL) { DEBUG(3,("get_mydnsfullname: getaddrinfo failed for " "name %s [%s]\n", my_hostname, gai_strerror(ret) )); return NULL; } /* * Make sure that getaddrinfo() returns the "correct" host name. */ if (res->ai_canonname == NULL) { DEBUG(3,("get_mydnsfullname: failed to get " "canonical name for %s\n", my_hostname)); freeaddrinfo(res); return NULL; } /* This copies the data, so we must do a lookup * afterwards to find the value to return. */ memcache_add(NULL, SINGLETON_CACHE, data_blob_string_const("get_mydnsfullname"), data_blob_string_const(res->ai_canonname)); if (!memcache_lookup(NULL, SINGLETON_CACHE, data_blob_string_const("get_mydnsfullname"), &tmp)) { tmp = data_blob_talloc(talloc_tos(), res->ai_canonname, strlen(res->ai_canonname) + 1); } freeaddrinfo(res); return (const char *)tmp.data; } /************************************************************ Is this my name ? ************************************************************/ bool is_myname_or_ipaddr(const char *s) { TALLOC_CTX *ctx = talloc_tos(); char *name = NULL; const char *dnsname; char *servername = NULL; if (!s) { return false; } /* Santize the string from '\\name' */ name = talloc_strdup(ctx, s); if (!name) { return false; } servername = strrchr_m(name, '\\' ); if (!servername) { servername = name; } else { servername++; } /* Optimize for the common case */ if (strequal(servername, global_myname())) { return true; } /* Check for an alias */ if (is_myname(servername)) { return true; } /* Check for loopback */ if (strequal(servername, "127.0.0.1") || strequal(servername, "::1")) { return true; } if (strequal(servername, "localhost")) { return true; } /* Maybe it's my dns name */ dnsname = get_mydnsfullname(); if (dnsname && strequal(servername, dnsname)) { return true; } /* Handle possible CNAME records - convert to an IP addr. */ if (!is_ipaddress(servername)) { /* Use DNS to resolve the name, but only the first address */ struct sockaddr_storage ss; if (interpret_string_addr(&ss, servername,0)) { print_sockaddr(name, sizeof(name), &ss); servername = name; } } /* Maybe its an IP address? */ if (is_ipaddress(servername)) { struct sockaddr_storage ss; struct iface_struct *nics; int i, n; if (!interpret_string_addr(&ss, servername, AI_NUMERICHOST)) { return false; } if (is_zero_addr(&ss) || is_loopback_addr(&ss)) { return false; } nics = TALLOC_ARRAY(ctx, struct iface_struct, MAX_INTERFACES); if (!nics) { return false; } n = get_interfaces(nics, MAX_INTERFACES); for (i=0; i