diff options
Diffstat (limited to 'source3/lib/util_sock.c')
| -rw-r--r-- | source3/lib/util_sock.c | 2104 |
1 files changed, 2104 insertions, 0 deletions
diff --git a/source3/lib/util_sock.c b/source3/lib/util_sock.c new file mode 100644 index 0000000000..e20768ed89 --- /dev/null +++ b/source3/lib/util_sock.c @@ -0,0 +1,2104 @@ +/* + 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 <http://www.gnu.org/licenses/>. +*/ + +#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) +{ +#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 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; + + /* Linux man page on getaddinfo() says port will be + uninitialized when service string in NULL */ + + ret = getaddrinfo(str, NULL, + &hints, + ppres); + + if (ret) { + DEBUG(3,("interpret_string_addr_internal: 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) +{ + struct addrinfo *res = NULL; +#if defined(HAVE_IPV6) + char addr[INET6_ADDRSTRLEN]; + 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)); + 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_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; + + /* 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 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) { + /* 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); +} + +/**************************************************************************** + 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 +****************************************************************************/ + +NTSTATUS read_socket_with_timeout(int fd, char *buf, + size_t mincnt, size_t maxcnt, + unsigned int time_out, + size_t *size_ret) +{ + 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 NT_STATUS_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")); + return NT_STATUS_END_OF_FILE; + } + + 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) )); + } + return map_nt_error_from_unix(errno); + } + nread += readret; + } + goto done; + } + + /* 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) )); + } + return map_nt_error_from_unix(errno); + } + + /* Did we timeout ? */ + if (selrtn == 0) { + DEBUG(10,("read_socket_with_timeout: timeout read. " + "select timed out.\n")); + return NT_STATUS_IO_TIMEOUT; + } + + 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")); + return NT_STATUS_END_OF_FILE; + } + + 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) )); + } + return map_nt_error_from_unix(errno); + } + + nread += readret; + } + + done: + /* Return the number we got */ + if (size_ret) { + *size_ret = nread; + } + return NT_STATUS_OK; +} + +/**************************************************************************** + Read data from the client, reading exactly N bytes. +****************************************************************************/ + +NTSTATUS read_data(int fd, char *buffer, size_t N) +{ + return read_socket_with_timeout(fd, buffer, N, N, 0, NULL); +} + +/**************************************************************************** + 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. +****************************************************************************/ + +NTSTATUS read_smb_length_return_keepalive(int fd, char *inbuf, + unsigned int timeout, + size_t *len) +{ + int msg_type; + NTSTATUS status; + + status = read_socket_with_timeout(fd, inbuf, 4, 4, timeout, NULL); + + if (!NT_STATUS_IS_OK(status)) { + return status; + } + + *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 NT_STATUS_OK; +} + +/**************************************************************************** + 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. +****************************************************************************/ + +NTSTATUS read_smb_length(int fd, char *inbuf, unsigned int timeout, + size_t *len) +{ + uint8_t msgtype = SMBkeepalive; + + while (msgtype == SMBkeepalive) { + NTSTATUS status; + + status = read_smb_length_return_keepalive(fd, inbuf, timeout, + len); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + + msgtype = CVAL(inbuf, 0); + } + + DEBUG(10,("read_smb_length: got smb length of %lu\n", + (unsigned long)len)); + + return NT_STATUS_OK; +} + +/**************************************************************************** + Read an smb from a fd. + 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 buflen limit. + Doesn't check the MAC on signed packets. +****************************************************************************/ + +NTSTATUS receive_smb_raw(int fd, char *buffer, size_t buflen, unsigned int timeout, + size_t maxlen, size_t *p_len) +{ + size_t len; + NTSTATUS status; + + status = read_smb_length_return_keepalive(fd,buffer,timeout,&len); + + if (!NT_STATUS_IS_OK(status)) { + DEBUG(10, ("receive_smb_raw: %s!\n", nt_errstr(status))); + return status; + } + + if (len > buflen) { + DEBUG(0,("Invalid packet length! (%lu bytes).\n", + (unsigned long)len)); + return NT_STATUS_INVALID_PARAMETER; + } + + if(len > 0) { + if (maxlen) { + len = MIN(len,maxlen); + } + + status = read_socket_with_timeout( + fd, buffer+4, len, len, timeout, &len); + + if (!NT_STATUS_IS_OK(status)) { + return status; + } + + /* 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); + } + + *p_len = len; + return NT_STATUS_OK; +} + +/**************************************************************************** + 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 the first addr that connects. + + This is for simultaneous connection attempts to port 445 and 139 of a host + or for simultatneous connection attempts to multiple DCs at once. We return + a socket fd of the first successful connection. + + @param[in] addrs list of Internet addresses and ports to connect to + @param[in] num_addrs number of address/port pairs in the addrs list + @param[in] timeout time after which we stop waiting for a socket connection + to succeed, given in milliseconds + @param[out] fd_index the entry in addrs which we successfully connected to + @param[out] fd fd of the open and connected socket + @return true on a successful connection, false if all connection attempts + failed or we timed out +*******************************************************************/ + +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; i<num_addrs; i++) + sockets[i] = -1; + + for (i=0; i<num_addrs; i++) { + sockets[i] = socket(addrs[i].ss_family, SOCK_STREAM, 0); + if (sockets[i] < 0) + goto done; + set_blocking(sockets[i], false); + } + + connect_again: + good_connect = false; + + for (i=0; i<num_addrs; i++) { + const struct sockaddr * a = + (const struct sockaddr *)&(addrs[i]); + + if (sockets[i] == -1) + continue; + + if (sys_connect(sockets[i], a) == 0) { + /* Rather unlikely as we are non-blocking, but it + * might actually happen. */ + resulting_index = i; + goto done; + } + + if (errno == EINPROGRESS || errno == EALREADY || +#ifdef EISCONN + errno == EISCONN || +#endif + errno == EAGAIN || errno == EINTR) { + /* These are the error messages that something is + progressing. */ + good_connect = true; + } else if (errno != 0) { + /* There was a direct error */ + close(sockets[i]); + sockets[i] = -1; + } + } + + if (!good_connect) { + /* All of the connect's resulted in real error conditions */ + goto done; + } + + /* Lets see if any of the connect attempts succeeded */ + + maxfd = 0; + FD_ZERO(&wr_fds); + FD_ZERO(&r_fds); + + for (i=0; i<num_addrs; i++) { + if (sockets[i] == -1) + continue; + FD_SET(sockets[i], &wr_fds); + FD_SET(sockets[i], &r_fds); + if (sockets[i]>maxfd) + 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<num_addrs; i++) { + + if (sockets[i] == -1) + continue; + + /* Stevens, Network Programming says that if there's a + * successful connect, the socket is only writable. Upon an + * error, it's both readable and writable. */ + + if (FD_ISSET(sockets[i], &r_fds) && + FD_ISSET(sockets[i], &wr_fds)) { + /* readable and writable, so it's an error */ + close(sockets[i]); + sockets[i] = -1; + continue; + } + + if (!FD_ISSET(sockets[i], &r_fds) && + FD_ISSET(sockets[i], &wr_fds)) { + /* Only writable, so it's connected */ + resulting_index = i; + goto done; + } + } + + next_round: + + timeout -= connect_loop; + if (timeout <= 0) + goto done; + connect_loop *= 1.5; + if (connect_loop > timeout) + connect_loop = timeout; + goto connect_again; + + done: + for (i=0; i<num_addrs; i++) { + if (i == resulting_index) + continue; + if (sockets[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; + } + + if (asprintf(&path, "%s/%s", socket_dir, socket_name) == -1) { + 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); + if (sock != -1) + 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<n; i++) { + if (addr_equal(&nics[i].ip, &ss)) { + TALLOC_FREE(nics); + return true; + } + } + TALLOC_FREE(nics); + } + + /* No match */ + return false; +} |