Mercurial > dovecot > original-hg > dovecot-1.2
view src/lib/network.c @ 5865:22b300677807 HEAD
Added net_ip_hash().
author | Timo Sirainen <tss@iki.fi> |
---|---|
date | Mon, 02 Jul 2007 23:11:46 +0300 |
parents | e383a6b4f4da |
children | 74a6130211c2 |
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/* Copyright (c) 1999-2005 Timo Sirainen */ #include "lib.h" #include "close-keep-errno.h" #include "fd-set-nonblock.h" #include "network.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->ip, &ip2->ip, sizeof(ip1->ip)) == 0; #endif return memcmp(&ip1->ip, &ip2->ip, 4) == 0; } unsigned int net_ip_hash(const struct ip_addr *ip) { const unsigned char *p = (const unsigned char *)&ip->ip; unsigned int len, g, h = 0; #ifdef HAVE_IPV6 if (ip->family == AF_INET6) len = sizeof(ip->ip); else #endif len = 4; 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->ip, sizeof(ip->ip)); else #endif memcpy(&so->sin.sin_addr, &ip->ip, 4); } 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->ip, &so->sin6.sin6_addr, sizeof(ip->ip)); else #endif if (ip->family == AF_INET) memcpy(&ip->ip, &so->sin.sin_addr, 4); else memset(&ip->ip, 0, sizeof(ip->ip)); } 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; } 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) { struct sockaddr_un sa; int fd, ret; memset(&sa, 0, sizeof(sa)); sa.sun_family = AF_UNIX; if (strocpy(sa.sun_path, path, sizeof(sa.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, (void *)&sa, sizeof(sa)); if (ret < 0 && errno != EINPROGRESS) { close_keep_errno(fd); return -1; } 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) { struct in_addr *in_ip = (struct in_addr *) &ip->ip; ip->family = AF_INET; in_ip->s_addr = INADDR_ANY; } void net_get_ip_any6(struct ip_addr *ip) { #ifdef HAVE_IPV6 ip->family = AF_INET6; ip->ip = 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 both on the IPv4 and IPv6 addresses */ #ifdef IPV6_V6ONLY if (so.sin.sin_family == AF_INET6) { opt = 0; 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) { struct sockaddr_un sa; int fd; memset(&sa, 0, sizeof(sa)); sa.sun_family = AF_UNIX; if (strocpy(sa.sun_path, path, sizeof(sa.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, (void *)&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_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 (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 (ret == -1 && (errno == EINTR || errno == EAGAIN)) return 0; if (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].ip, hp->h_addr_list[count], 4); } #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; } 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->ip, 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->ip.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->ip) == 0) return -1; #else ip->ip.s_addr = 0; #endif } else { /* IPv4 */ ip->family = AF_INET; if (inet_aton(addr, (struct in_addr *) &ip->ip) == 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->ip.s6_addr, v4_prefix, sizeof(v4_prefix)) != 0) return -1; dest->family = AF_INET; memcpy(&dest->ip, &src->ip.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-recovable 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; }