From b6ecb00d23af3611da98d98f28e1c2583d428e00 Mon Sep 17 00:00:00 2001 From: Martin Sustrik Date: Thu, 18 Aug 2011 17:40:42 +0200 Subject: TCP address related functionality moved to tcp_address_t Signed-off-by: Martin Sustrik --- src/tcp_address.cpp | 422 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 422 insertions(+) create mode 100644 src/tcp_address.cpp (limited to 'src/tcp_address.cpp') diff --git a/src/tcp_address.cpp b/src/tcp_address.cpp new file mode 100644 index 0000000..358c847 --- /dev/null +++ b/src/tcp_address.cpp @@ -0,0 +1,422 @@ +/* + Copyright (c) 2007-2011 iMatix Corporation + Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file + + This file is part of 0MQ. + + 0MQ is free software; you can redistribute it and/or modify it under + the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + 0MQ 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 Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with this program. If not, see . +*/ + +#include +#include + +#include "tcp_address.hpp" +#include "platform.hpp" +#include "err.hpp" + +#ifdef ZMQ_HAVE_WINDOWS +#include "windows.hpp" +#else +#include +#include +#include +#include +#include +#include +#endif + +// Some platforms (notably Darwin/OSX and NetBSD) do not define all AI_ +// flags for getaddrinfo(). This can be worked around safely by defining +// these to 0. +#ifndef AI_ADDRCONFIG +#define AI_ADDRCONFIG 0 +#endif + +#if defined ZMQ_HAVE_SOLARIS + +#include +#include +#include + +// On Solaris platform, network interface name can be queried by ioctl. +static int resolve_nic_name (struct sockaddr* addr_, char const *interface_, + bool ipv4only_) +{ + // TODO: Unused parameter, IPv6 support not implemented for Solaris. + (void) ipv4only_; + + // Create a socket. + int fd = socket (AF_INET, SOCK_DGRAM, 0); + zmq_assert (fd != -1); + + // Retrieve number of interfaces. + lifnum ifn; + ifn.lifn_family = AF_INET; + ifn.lifn_flags = 0; + int rc = ioctl (fd, SIOCGLIFNUM, (char*) &ifn); + zmq_assert (rc != -1); + + // Allocate memory to get interface names. + size_t ifr_size = sizeof (struct lifreq) * ifn.lifn_count; + char *ifr = (char*) malloc (ifr_size); + alloc_assert (ifr); + + // Retrieve interface names. + lifconf ifc; + ifc.lifc_family = AF_INET; + ifc.lifc_flags = 0; + ifc.lifc_len = ifr_size; + ifc.lifc_buf = ifr; + rc = ioctl (fd, SIOCGLIFCONF, (char*) &ifc); + zmq_assert (rc != -1); + + // Find the interface with the specified name and AF_INET family. + bool found = false; + lifreq *ifrp = ifc.lifc_req; + for (int n = 0; n < (int) (ifc.lifc_len / sizeof (lifreq)); + n ++, ifrp ++) { + if (!strcmp (interface_, ifrp->lifr_name)) { + rc = ioctl (fd, SIOCGLIFADDR, (char*) ifrp); + zmq_assert (rc != -1); + if (ifrp->lifr_addr.ss_family == AF_INET) { + *(sockaddr_in*) addr_ = *(sockaddr_in*) &ifrp->lifr_addr; + found = true; + break; + } + } + } + + // Clean-up. + free (ifr); + close (fd); + + if (!found) { + errno = ENODEV; + return -1; + } + + return 0; +} + +#elif defined ZMQ_HAVE_AIX || ZMQ_HAVE_HPUX || ZMQ_HAVE_ANDROID + +#include +#include +#include +#include + +static int resolve_nic_name (struct sockaddr* addr_, char const *interface_, + bool ipv4only_) +{ + // TODO: Unused parameter, IPv6 support not implemented for AIX or HP/UX. + (void) ipv4only_; + + // Create a socket. + int sd = socket (AF_INET, SOCK_DGRAM, 0); + zmq_assert (sd != -1); + + struct ifreq ifr; + + // Copy interface name for ioctl get. + strncpy (ifr.ifr_name, interface_, sizeof (ifr.ifr_name)); + + // Fetch interface address. + int rc = ioctl (sd, SIOCGIFADDR, (caddr_t) &ifr, sizeof (struct ifreq)); + + // Clean up. + close (sd); + + if (rc == -1) { + errno = ENODEV; + return -1; + } + + memcpy (&((sockaddr_in*) addr_)->sin_addr, + &((sockaddr_in*) &ifr.ifr_addr)->sin_addr, sizeof (in_addr)); + + return 0; +} + +#elif ((defined ZMQ_HAVE_LINUX || defined ZMQ_HAVE_FREEBSD ||\ + defined ZMQ_HAVE_OSX || defined ZMQ_HAVE_OPENBSD ||\ + defined ZMQ_HAVE_QNXNTO || defined ZMQ_HAVE_NETBSD)\ + && defined ZMQ_HAVE_IFADDRS) + +#include + +// On these platforms, network interface name can be queried +// using getifaddrs function. +static int resolve_nic_name (struct sockaddr* addr_, char const *interface_, + bool ipv4only_) +{ + // Get the addresses. + ifaddrs* ifa = NULL; + int rc = getifaddrs (&ifa); + zmq_assert (rc == 0); + zmq_assert (ifa != NULL); + + // Find the corresponding network interface. + bool found = false; + for (ifaddrs *ifp = ifa; ifp != NULL ;ifp = ifp->ifa_next) + { + if (ifp->ifa_addr == NULL) + continue; + + int family = ifp->ifa_addr->sa_family; + + if ((family == AF_INET + || (!ipv4only_ && family == AF_INET6)) + && !strcmp (interface_, ifp->ifa_name)) + { + memcpy (addr_, ifp->ifa_addr, + (family == AF_INET) ? sizeof (struct sockaddr_in) + : sizeof (struct sockaddr_in6)); + found = true; + break; + } + } + + // Clean-up; + freeifaddrs (ifa); + + if (!found) { + errno = ENODEV; + return -1; + } + + return 0; +} + +#else + +// On other platforms we assume there are no sane interface names. +// This is true especially of Windows. +static int resolve_nic_name (struct sockaddr* addr_, char const *interface_, + bool ipv4only_) +{ + // All unused parameters. + (void) addr_; + (void) interface_; + (void) ipv4only_; + + errno = ENODEV; + return -1; +} + +#endif + +int zmq::tcp_address_t::resolve_interface (char const *interface_, + bool ipv4only_) +{ + // Initialize temporary output pointers with storage address. + sockaddr_storage ss; + sockaddr *out_addr = (sockaddr *) &ss; + socklen_t out_addrlen; + + // Initialise IP-format family/port and populate temporary output pointers + // with the address. + if (ipv4only_) { + sockaddr_in ip4_addr; + memset (&ip4_addr, 0, sizeof (ip4_addr)); + ip4_addr.sin_family = AF_INET; + ip4_addr.sin_addr.s_addr = htonl (INADDR_ANY); + out_addrlen = (socklen_t) sizeof (ip4_addr); + memcpy (out_addr, &ip4_addr, out_addrlen); + } else { + sockaddr_in6 ip6_addr; + memset (&ip6_addr, 0, sizeof (ip6_addr)); + ip6_addr.sin6_family = AF_INET6; + memcpy (&ip6_addr.sin6_addr, &in6addr_any, sizeof (in6addr_any)); + out_addrlen = (socklen_t) sizeof (ip6_addr); + memcpy (out_addr, &ip6_addr, out_addrlen); + } + + // * resolves to INADDR_ANY or in6addr_any. + if (strcmp (interface_, "*") == 0) { + zmq_assert (out_addrlen <= (socklen_t) sizeof (address)); + memcpy (&address, out_addr, out_addrlen); + return 0; + } + + // Try to resolve the string as a NIC name. + int rc = resolve_nic_name (out_addr, interface_, ipv4only_); + if (rc != 0 && errno != ENODEV) + return rc; + if (rc == 0) { + zmq_assert (out_addrlen <= (socklen_t) sizeof (address)); + memcpy (&address, out_addr, out_addrlen); + return 0; + } + + // There's no such interface name. Assume literal address. +#if defined ZMQ_HAVE_OPENVMS && defined __ia64 + __addrinfo64 *res = NULL; + __addrinfo64 req; +#else + addrinfo *res = NULL; + addrinfo req; +#endif + memset (&req, 0, sizeof (req)); + + // Choose IPv4 or IPv6 protocol family. Note that IPv6 allows for + // IPv4-in-IPv6 addresses. + req.ai_family = ipv4only_ ? AF_INET : AF_INET6; + + // Arbitrary, not used in the output, but avoids duplicate results. + req.ai_socktype = SOCK_STREAM; + + // Restrict hostname/service to literals to avoid any DNS lookups or + // service-name irregularity due to indeterminate socktype. + req.ai_flags = AI_PASSIVE | AI_NUMERICHOST; + +#ifndef ZMQ_HAVE_WINDOWS + // Windows by default maps IPv4 addresses into IPv6. In this API we only + // require IPv4-mapped addresses when no native IPv6 interfaces are + // available (~AI_ALL). This saves an additional DNS roundtrip for IPv4 + // addresses. + if (req.ai_family == AF_INET6) + req.ai_flags |= AI_V4MAPPED; +#endif + + // Resolve the literal address. Some of the error info is lost in case + // of error, however, there's no way to report EAI errors via errno. + rc = getaddrinfo (interface_, NULL, &req, &res); + if (rc) { + errno = ENODEV; + return -1; + } + + // Use the first result. + zmq_assert ((size_t) (res->ai_addrlen) <= sizeof (address)); + memcpy (&address, res->ai_addr, res->ai_addrlen); + + // Cleanup getaddrinfo after copying the possibly referenced result. + if (res) + freeaddrinfo (res); + + return 0; +} + +int zmq::tcp_address_t::resolve_hostname (const char *hostname_, bool ipv4only_) +{ + // Set up the query. + addrinfo req; + memset (&req, 0, sizeof (req)); + + // Choose IPv4 or IPv6 protocol family. Note that IPv6 allows for + // IPv4-in-IPv6 addresses. + req.ai_family = ipv4only_ ? AF_INET : AF_INET6; + + // Need to choose one to avoid duplicate results from getaddrinfo() - this + // doesn't really matter, since it's not included in the addr-output. + req.ai_socktype = SOCK_STREAM; + +#ifndef ZMQ_HAVE_WINDOWS + // Windows by default maps IPv4 addresses into IPv6. In this API we only + // require IPv4-mapped addresses when no native IPv6 interfaces are + // available. This saves an additional DNS roundtrip for IPv4 addresses. + if (req.ai_family == AF_INET6) + req.ai_flags |= AI_V4MAPPED; +#endif + + // Resolve host name. Some of the error info is lost in case of error, + // however, there's no way to report EAI errors via errno. + addrinfo *res; + int rc = getaddrinfo (hostname_, NULL, &req, &res); + if (rc) { + switch (rc) { + case EAI_MEMORY: + errno = ENOMEM; + break; + default: + errno = EINVAL; + break; + } + return -1; + } + + // Copy first result to output addr with hostname and service. + zmq_assert ((size_t) (res->ai_addrlen) <= sizeof (address)); + memcpy (&address, res->ai_addr, res->ai_addrlen); + + freeaddrinfo (res); + + return 0; +} + +zmq::tcp_address_t::tcp_address_t () +{ + memset (&address, 0, sizeof (address)); +} + +zmq::tcp_address_t::~tcp_address_t () +{ +} + +int zmq::tcp_address_t::resolve (const char *name_, bool local_, bool ipv4only_) +{ + // Find the ':' at end that separates address from the port number. + const char *delimiter = strrchr (name_, ':'); + if (!delimiter) { + errno = EINVAL; + return -1; + } + + // Separate the address/port. + std::string addr_str (name_, delimiter - name_); + std::string port_str (delimiter + 1); + + // Parse the port number (0 is not a valid port). + uint16_t port = (uint16_t) atoi (port_str.c_str()); + if (port == 0) { + errno = EINVAL; + return -1; + } + + // Resolve the IP address. + int rc; + if (local_) + rc = resolve_interface (addr_str.c_str (), ipv4only_); + else + rc = resolve_hostname (addr_str.c_str (), ipv4only_); + if (rc != 0) + return -1; + + // Set the port into the address structure. + if (address.generic.sa_family == AF_INET6) + address.ipv6.sin6_port = htons (port); + else + address.ipv4.sin_port = htons (port); + + return 0; +} + +sockaddr *zmq::tcp_address_t::addr () +{ + return &address.generic; +} + +socklen_t zmq::tcp_address_t::addrlen () +{ + if (address.generic.sa_family == AF_INET6) + return (socklen_t) sizeof (address.ipv6); + else + return (socklen_t) sizeof (address.ipv4); +} + +sa_family_t zmq::tcp_address_t::family () +{ + return address.generic.sa_family; +} + -- cgit v1.2.3