Mercurial > dovecot > core-2.2
view src/lib/network.c @ 10582:615eef3139c2 HEAD
Updated copyright notices to include year 2010.
author | Timo Sirainen <tss@iki.fi> |
---|---|
date | Mon, 25 Jan 2010 01:19:08 +0200 |
parents | 1bc88aa1373f |
children | a4666cc8cb7b |
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/* Copyright (c) 1999-2010 Dovecot authors, see the included COPYING file */ #include "lib.h" #include "close-keep-errno.h" #include "fd-set-nonblock.h" #include "time-util.h" #include "network.h" #include <stdlib.h> #include <unistd.h> #include <fcntl.h> #include <ctype.h> #include <sys/un.h> #include <netinet/tcp.h> union sockaddr_union { struct sockaddr sa; struct sockaddr_in sin; #ifdef HAVE_IPV6 struct sockaddr_in6 sin6; #endif }; #ifdef HAVE_IPV6 # define SIZEOF_SOCKADDR(so) ((so).sa.sa_family == AF_INET6 ? \ sizeof(so.sin6) : sizeof(so.sin)) #else # define SIZEOF_SOCKADDR(so) (sizeof(so.sin)) #endif bool net_ip_compare(const struct ip_addr *ip1, const struct ip_addr *ip2) { if (ip1->family != ip2->family) return 0; #ifdef HAVE_IPV6 if (ip1->family == AF_INET6) { return memcmp(&ip1->u.ip6, &ip2->u.ip6, sizeof(ip1->u.ip6)) == 0; } #endif return memcmp(&ip1->u.ip4, &ip2->u.ip4, sizeof(ip1->u.ip4)) == 0; } unsigned int net_ip_hash(const struct ip_addr *ip) { const unsigned char *p; unsigned int len, g, h = 0; #ifdef HAVE_IPV6 if (ip->family == AF_INET6) { p = ip->u.ip6.s6_addr; len = sizeof(ip->u.ip6); } else #endif { return ip->u.ip4.s_addr; } for (; len > 0; len--, p++) { h = (h << 4) + *p; if ((g = h & 0xf0000000UL)) { h = h ^ (g >> 24); h = h ^ g; } } return h; } /* copy IP to sockaddr */ static inline void sin_set_ip(union sockaddr_union *so, const struct ip_addr *ip) { if (ip == NULL) { #ifdef HAVE_IPV6 so->sin6.sin6_family = AF_INET6; so->sin6.sin6_addr = in6addr_any; #else so->sin.sin_family = AF_INET; so->sin.sin_addr.s_addr = INADDR_ANY; #endif return; } so->sin.sin_family = ip->family; #ifdef HAVE_IPV6 if (ip->family == AF_INET6) memcpy(&so->sin6.sin6_addr, &ip->u.ip6, sizeof(ip->u.ip6)); else #endif memcpy(&so->sin.sin_addr, &ip->u.ip4, sizeof(ip->u.ip4)); } static inline void sin_get_ip(const union sockaddr_union *so, struct ip_addr *ip) { ip->family = so->sin.sin_family; #ifdef HAVE_IPV6 if (ip->family == AF_INET6) memcpy(&ip->u.ip6, &so->sin6.sin6_addr, sizeof(ip->u.ip6)); else #endif if (ip->family == AF_INET) memcpy(&ip->u.ip4, &so->sin.sin_addr, sizeof(ip->u.ip4)); else memset(&ip->u, 0, sizeof(ip->u)); } static inline void sin_set_port(union sockaddr_union *so, unsigned int port) { #ifdef HAVE_IPV6 if (so->sin.sin_family == AF_INET6) so->sin6.sin6_port = htons((unsigned short) port); else #endif so->sin.sin_port = htons((unsigned short) port); } static inline unsigned int sin_get_port(union sockaddr_union *so) { #ifdef HAVE_IPV6 if (so->sin.sin_family == AF_INET6) return ntohs(so->sin6.sin6_port); #endif if (so->sin.sin_family == AF_INET) return ntohs(so->sin.sin_port); return 0; } #ifdef __FreeBSD__ static int net_connect_ip_freebsd(const struct ip_addr *ip, unsigned int port, const struct ip_addr *my_ip); int net_connect_ip(const struct ip_addr *ip, unsigned int port, const struct ip_addr *my_ip) { int fd, try; for (try = 0;;) { fd = net_connect_ip_freebsd(ip, port, my_ip); if (fd != -1 || ++try == 5 || (errno != EADDRINUSE && errno != EACCES)) break; /* This may be just a temporary problem: EADDRINUSE: busy EACCES: pf may cause this if another connection used the same port recently */ } return fd; } /* then some kludging: */ #define net_connect_ip net_connect_ip_freebsd static #endif int net_connect_ip(const struct ip_addr *ip, unsigned int port, const struct ip_addr *my_ip) { union sockaddr_union so; int fd, ret, opt = 1; if (my_ip != NULL && ip->family != my_ip->family) { i_warning("net_connect_ip(): ip->family != my_ip->family"); my_ip = NULL; } /* create the socket */ memset(&so, 0, sizeof(so)); so.sin.sin_family = ip->family; fd = socket(ip->family, SOCK_STREAM, 0); if (fd == -1) { i_error("socket() failed: %m"); return -1; } /* set socket options */ setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)); setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &opt, sizeof(opt)); net_set_nonblock(fd, TRUE); /* set our own address */ if (my_ip != NULL) { sin_set_ip(&so, my_ip); if (bind(fd, &so.sa, SIZEOF_SOCKADDR(so)) == -1) { /* failed, set it back to INADDR_ANY */ i_error("bind(%s) failed: %m", net_ip2addr(my_ip)); close_keep_errno(fd); return -1; } } /* connect */ sin_set_ip(&so, ip); sin_set_port(&so, port); ret = connect(fd, &so.sa, SIZEOF_SOCKADDR(so)); #ifndef WIN32 if (ret < 0 && errno != EINPROGRESS) #else if (ret < 0 && WSAGetLastError() != WSAEWOULDBLOCK) #endif { close_keep_errno(fd); return -1; } return fd; } int net_connect_unix(const char *path) { union { struct sockaddr sa; struct sockaddr_un un; } sa; int fd, ret; memset(&sa, 0, sizeof(sa)); sa.un.sun_family = AF_UNIX; if (i_strocpy(sa.un.sun_path, path, sizeof(sa.un.sun_path)) < 0) { /* too long path */ errno = EINVAL; return -1; } /* create the socket */ fd = socket(PF_UNIX, SOCK_STREAM, 0); if (fd == -1) { i_error("socket(%s) failed: %m", path); return -1; } net_set_nonblock(fd, TRUE); /* connect */ ret = connect(fd, &sa.sa, sizeof(sa)); if (ret < 0 && errno != EINPROGRESS) { close_keep_errno(fd); return -1; } return fd; } int net_connect_unix_with_retries(const char *path, unsigned int msecs) { struct timeval start, now; int fd; if (gettimeofday(&start, NULL) < 0) i_panic("gettimeofday() failed: %m"); do { fd = net_connect_unix(path); if (fd != -1 || (errno != EAGAIN && errno != ECONNREFUSED)) break; /* busy. wait for a while. */ usleep(((rand() % 10) + 1) * 10000); if (gettimeofday(&now, NULL) < 0) i_panic("gettimeofday() failed: %m"); } while (timeval_diff_msecs(&now, &start) < (int)msecs); return fd; } void net_disconnect(int fd) { if (close(fd) < 0) i_error("net_disconnect() failed: %m"); } void net_set_nonblock(int fd, bool nonblock) { if (fd_set_nonblock(fd, nonblock) < 0) i_fatal("fd_set_nonblock(%d) failed: %m", fd); } int net_set_cork(int fd ATTR_UNUSED, bool cork ATTR_UNUSED) { #ifdef TCP_CORK int val = cork; return setsockopt(fd, IPPROTO_TCP, TCP_CORK, &val, sizeof(val)); #else errno = ENOPROTOOPT; return -1; #endif } void net_get_ip_any4(struct ip_addr *ip) { ip->family = AF_INET; ip->u.ip4.s_addr = INADDR_ANY; } void net_get_ip_any6(struct ip_addr *ip) { #ifdef HAVE_IPV6 ip->family = AF_INET6; ip->u.ip6 = in6addr_any; #else memset(ip, 0, sizeof(struct ip_addr)); #endif } int net_listen(const struct ip_addr *my_ip, unsigned int *port, int backlog) { union sockaddr_union so; int ret, fd, opt = 1; socklen_t len; memset(&so, 0, sizeof(so)); sin_set_port(&so, *port); sin_set_ip(&so, my_ip); /* create the socket */ fd = socket(so.sin.sin_family, SOCK_STREAM, 0); #ifdef HAVE_IPV6 if (fd == -1 && (errno == EINVAL || errno == EAFNOSUPPORT)) { /* IPv6 is not supported by OS */ so.sin.sin_family = AF_INET; so.sin.sin_addr.s_addr = INADDR_ANY; fd = socket(AF_INET, SOCK_STREAM, 0); } #endif if (fd == -1) { i_error("socket() failed: %m"); return -1; } /* set socket options */ setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)); setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &opt, sizeof(opt)); /* If using IPv6, bind only to IPv6 if possible. This avoids ambiguities with IPv4-mapped IPv6 addresses. */ #ifdef IPV6_V6ONLY if (so.sin.sin_family == AF_INET6) { opt = 1; setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &opt, sizeof(opt)); } #endif /* specify the address/port we want to listen in */ ret = bind(fd, &so.sa, SIZEOF_SOCKADDR(so)); if (ret < 0) { if (errno != EADDRINUSE) { i_error("bind(%s, %u) failed: %m", net_ip2addr(my_ip), *port); } } else { /* get the actual port we started listen */ len = SIZEOF_SOCKADDR(so); ret = getsockname(fd, &so.sa, &len); if (ret >= 0) { *port = sin_get_port(&so); /* start listening */ if (listen(fd, backlog) >= 0) return fd; if (errno != EADDRINUSE) i_error("listen() failed: %m"); } } /* error */ close_keep_errno(fd); return -1; } int net_listen_unix(const char *path, int backlog) { union { struct sockaddr sa; struct sockaddr_un un; } sa; int fd; memset(&sa, 0, sizeof(sa)); sa.un.sun_family = AF_UNIX; if (i_strocpy(sa.un.sun_path, path, sizeof(sa.un.sun_path)) < 0) { /* too long path */ errno = EINVAL; return -1; } /* create the socket */ fd = socket(PF_UNIX, SOCK_STREAM, 0); if (fd == -1) { i_error("socket() failed: %m"); return -1; } /* bind */ if (bind(fd, &sa.sa, sizeof(sa)) < 0) { if (errno != EADDRINUSE) i_error("bind(%s) failed: %m", path); } else { /* start listening */ if (listen(fd, backlog) == 0) return fd; if (errno != EADDRINUSE) i_error("listen() failed: %m"); } close_keep_errno(fd); return -1; } int net_listen_unix_unlink_stale(const char *path, int backlog) { unsigned int i = 0; int fd; while ((fd = net_listen_unix(path, backlog)) == -1) { if (errno != EADDRINUSE || ++i == 2) return -1; /* see if it really exists */ fd = net_connect_unix(path); if (fd != -1 || errno != ECONNREFUSED) { if (fd != -1) (void)close(fd); errno = EADDRINUSE; return -1; } /* delete and try again */ if (unlink(path) < 0 && errno != ENOENT) { i_error("unlink(%s) failed: %m", path); errno = EADDRINUSE; return -1; } } return fd; } int net_accept(int fd, struct ip_addr *addr, unsigned int *port) { union sockaddr_union so; int ret; socklen_t addrlen; i_assert(fd >= 0); addrlen = sizeof(so); ret = accept(fd, &so.sa, &addrlen); if (ret < 0) { if (errno == EAGAIN || errno == ECONNABORTED) return -1; else return -2; } if (addr != NULL) sin_get_ip(&so, addr); if (port != NULL) *port = sin_get_port(&so); return ret; } ssize_t net_receive(int fd, void *buf, size_t len) { ssize_t ret; i_assert(fd >= 0); i_assert(len <= SSIZE_T_MAX); ret = read(fd, buf, len); if (ret == 0) { /* disconnected */ errno = 0; return -2; } if (unlikely(ret < 0)) { if (errno == EINTR || errno == EAGAIN) return 0; if (errno == ECONNRESET || errno == ETIMEDOUT) { /* treat as disconnection */ return -2; } } return ret; } ssize_t net_transmit(int fd, const void *data, size_t len) { ssize_t ret; i_assert(fd >= 0); i_assert(len <= SSIZE_T_MAX); ret = send(fd, data, len, 0); if (unlikely(ret == -1 && (errno == EINTR || errno == EAGAIN))) return 0; if (unlikely(errno == EPIPE)) return -2; return ret; } int net_gethostbyname(const char *addr, struct ip_addr **ips, unsigned int *ips_count) { /* @UNSAFE */ #ifdef HAVE_IPV6 union sockaddr_union *so; struct addrinfo hints, *ai, *origai; int host_error; #else struct hostent *hp; #endif int count; *ips = NULL; *ips_count = 0; #ifdef HAVE_IPV6 memset(&hints, 0, sizeof(struct addrinfo)); hints.ai_socktype = SOCK_STREAM; /* save error to host_error for later use */ host_error = getaddrinfo(addr, NULL, &hints, &ai); if (host_error != 0) return host_error; /* get number of IPs */ origai = ai; for (count = 0; ai != NULL; ai = ai->ai_next) count++; *ips_count = count; *ips = t_malloc(sizeof(struct ip_addr) * count); count = 0; for (ai = origai; ai != NULL; ai = ai->ai_next, count++) { so = (union sockaddr_union *) ai->ai_addr; sin_get_ip(so, &(*ips)[count]); } freeaddrinfo(origai); #else hp = gethostbyname(addr); if (hp == NULL) return h_errno; /* get number of IPs */ count = 0; while (hp->h_addr_list[count] != NULL) count++; *ips_count = count; *ips = t_malloc(sizeof(struct ip_addr) * count); while (count > 0) { count--; (*ips)[count].family = AF_INET; memcpy(&(*ips)[count].u.ip4, hp->h_addr_list[count], sizeof((*ips)[count].u.ip4)); } #endif return 0; } int net_getsockname(int fd, struct ip_addr *addr, unsigned int *port) { union sockaddr_union so; socklen_t addrlen; i_assert(fd >= 0); addrlen = sizeof(so); if (getsockname(fd, &so.sa, &addrlen) == -1) return -1; if (addr != NULL) sin_get_ip(&so, addr); if (port != NULL) *port = sin_get_port(&so); return 0; } int net_getpeername(int fd, struct ip_addr *addr, unsigned int *port) { union sockaddr_union so; socklen_t addrlen; i_assert(fd >= 0); addrlen = sizeof(so); if (getpeername(fd, &so.sa, &addrlen) == -1) return -1; if (addr != NULL) sin_get_ip(&so, addr); if (port != NULL) *port = sin_get_port(&so); return 0; } int net_getunixname(int fd, const char **name_r) { struct sockaddr_un sa; socklen_t addrlen = sizeof(sa); if (getsockname(fd, (void *)&sa, &addrlen) < 0) return -1; if (sa.sun_family != AF_UNIX) { errno = ENOTSOCK; return -1; } *name_r = t_strdup(sa.sun_path); return 0; } const char *net_ip2addr(const struct ip_addr *ip) { #ifdef HAVE_IPV6 char addr[MAX_IP_LEN+1]; addr[MAX_IP_LEN] = '\0'; if (inet_ntop(ip->family, &ip->u.ip6, addr, MAX_IP_LEN) == NULL) return NULL; return t_strdup(addr); #else unsigned long ip4; if (ip->family != AF_INET) return NULL; ip4 = ntohl(ip->u.ip4.s_addr); return t_strdup_printf("%lu.%lu.%lu.%lu", (ip4 & 0xff000000UL) >> 24, (ip4 & 0x00ff0000) >> 16, (ip4 & 0x0000ff00) >> 8, (ip4 & 0x000000ff)); #endif } int net_addr2ip(const char *addr, struct ip_addr *ip) { if (strchr(addr, ':') != NULL) { /* IPv6 */ ip->family = AF_INET6; #ifdef HAVE_IPV6 if (inet_pton(AF_INET6, addr, &ip->u.ip6) == 0) return -1; #else ip->u.ip4.s_addr = 0; #endif } else { /* IPv4 */ ip->family = AF_INET; if (inet_aton(addr, &ip->u.ip4) == 0) return -1; } return 0; } int net_ipv6_mapped_ipv4_convert(const struct ip_addr *src, struct ip_addr *dest) { #ifdef HAVE_IPV6 static uint8_t v4_prefix[] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff }; if (!IPADDR_IS_V6(src)) return -1; if (memcmp(src->u.ip6.s6_addr, v4_prefix, sizeof(v4_prefix)) != 0) return -1; dest->family = AF_INET; memcpy(&dest->u.ip6, &src->u.ip6.s6_addr[3*4], 4); return 0; #else return -1; #endif } int net_geterror(int fd) { int data; socklen_t len = sizeof(data); if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &data, &len) == -1) return -1; return data; } const char *net_gethosterror(int error) { #ifdef HAVE_IPV6 i_assert(error != 0); return gai_strerror(error); #else switch (error) { case HOST_NOT_FOUND: return "Host not found"; case NO_ADDRESS: return "No IP address found for name"; case NO_RECOVERY: return "A non-recoverable name server error occurred"; case TRY_AGAIN: return "A temporary error on an authoritative name server"; } /* unknown error */ return NULL; #endif } int net_hosterror_notfound(int error) { #ifdef HAVE_IPV6 #ifdef EAI_NODATA /* NODATA is depricated */ return error != 1 && (error == EAI_NONAME || error == EAI_NODATA); #else return error != 1 && (error == EAI_NONAME); #endif #else return error == HOST_NOT_FOUND || error == NO_ADDRESS; #endif } const char *net_getservbyport(unsigned short port) { struct servent *entry; entry = getservbyport(htons(port), "tcp"); return entry == NULL ? NULL : entry->s_name; } bool is_ipv4_address(const char *addr) { while (*addr != '\0') { if (*addr != '.' && !i_isdigit(*addr)) return FALSE; addr++; } return TRUE; } bool is_ipv6_address(const char *addr) { while (*addr != '\0') { if (*addr != ':' && !i_isxdigit(*addr)) return FALSE; addr++; } return TRUE; } int net_parse_range(const char *network, struct ip_addr *ip_r, unsigned int *bits_r) { const char *p; int bits, max_bits; p = strchr(network, '/'); if (p != NULL) network = t_strdup_until(network, p++); if (net_addr2ip(network, ip_r) < 0) return -1; max_bits = IPADDR_IS_V4(ip_r) ? 32 : 128; if (p == NULL) { /* full IP address must match */ bits = max_bits; } else { /* get the network mask */ bits = atoi(p); if (bits < 0 || bits > max_bits) return -1; } *bits_r = bits; return 0; } bool net_is_in_network(const struct ip_addr *ip, const struct ip_addr *net_ip, unsigned int bits) { struct ip_addr tmp_ip; const uint32_t *ip1, *ip2; uint32_t mask, i1, i2; unsigned int pos, i; if (net_ipv6_mapped_ipv4_convert(ip, &tmp_ip) == 0) { /* IPv4 address mapped disguised as IPv6 address */ ip = &tmp_ip; } if (IPADDR_IS_V4(ip) != IPADDR_IS_V4(net_ip)) { /* one is IPv6 and one is IPv4 */ return FALSE; } i_assert(IPADDR_IS_V6(ip) == IPADDR_IS_V6(net_ip)); if (IPADDR_IS_V4(ip)) { ip1 = &ip->u.ip4.s_addr; ip2 = &net_ip->u.ip4.s_addr; } else { #ifdef HAVE_IPV6 ip1 = (const void *)&ip->u.ip6; ip2 = (const void *)&net_ip->u.ip6; #else /* shouldn't get here */ return FALSE; #endif } /* check first the full 32bit ints */ for (pos = 0, i = 0; pos + 32 <= bits; pos += 32, i++) { if (ip1[i] != ip2[i]) return FALSE; } i1 = htonl(ip1[i]); i2 = htonl(ip2[i]); /* check the last full bytes */ for (mask = 0xff000000; pos + 8 <= bits; pos += 8, mask >>= 8) { if ((i1 & mask) != (i2 & mask)) return FALSE; } /* check the last bits, they're reversed in bytes */ bits -= pos; for (mask = 0x80000000 >> (pos % 32); bits > 0; bits--, mask >>= 1) { if ((i1 & mask) != (i2 & mask)) return FALSE; } return TRUE; }