mirror of https://gerrit.osmocom.org/libosmocore
380 lines
13 KiB
C
380 lines
13 KiB
C
/*! \file sockaddr_str.c
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* Common implementation to store an IP address and port.
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*/
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/*
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* (C) 2019 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
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*
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* Author: neels@hofmeyr.de
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*
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* All Rights Reserved
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*
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* SPDX-License-Identifier: GPL-2.0+
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include "config.h"
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#ifdef HAVE_NETINET_IN_H
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#include <string.h>
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#include <errno.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <osmocom/core/sockaddr_str.h>
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#include <osmocom/core/utils.h>
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#include <osmocom/core/byteswap.h>
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/*! \addtogroup sockaddr_str
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*
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* Common operations to store IP address as a char string along with a uint16_t port number.
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*
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* Convert IP address string to/from in_addr and in6_addr, with bounds checking and basic housekeeping.
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*
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* The initial purpose is to store and translate IP address info between GSM CC and MGCP protocols -- GSM mostly using
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* 32-bit IPv4 addresses, and MGCP forwarding addresses as ASCII character strings.
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*
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* (At the time of writing, there are no immediate IPv6 users that come to mind, but it seemed appropriate to
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* accommodate both address families from the start.)
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*
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* @{
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* \file sockaddr_str.c
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*/
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/*! Return true if all elements of the osmo_sockaddr_str instance are set.
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* \param[in] sockaddr_str The instance to examine.
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* \return True iff ip is nonempty, port is not 0 and af is set to either AF_INET or AF_INET6.
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*/
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bool osmo_sockaddr_str_is_set(const struct osmo_sockaddr_str *sockaddr_str)
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{
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return sockaddr_str
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&& *sockaddr_str->ip
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&& sockaddr_str->port
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&& (sockaddr_str->af == AF_INET || sockaddr_str->af == AF_INET6);
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}
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/*! Distinguish between valid IPv4 and IPv6 strings.
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* This does not verify whether the string is a valid IP address; it assumes that the input is a valid IP address, and
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* on that premise returns whether it is an IPv4 or IPv6 string, by looking for '.' and ':' characters. It is safe to
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* feed invalid address strings, but the return value is only guaranteed to be meaningful if the input was valid.
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* \param[in] ip Valid IP address string.
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* \return AF_INET or AF_INET6, or AF_UNSPEC if neither '.' nor ':' are found in the string.
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*/
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int osmo_ip_str_type(const char *ip)
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{
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if (!ip)
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return AF_UNSPEC;
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/* Could also be IPv4-mapped IPv6 format with both colons and dots: x:x:x:x:x:x:d.d.d.d */
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if (strchr(ip, ':'))
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return AF_INET6;
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if (strchr(ip, '.'))
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return AF_INET;
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return AF_UNSPEC;
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}
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/*! Safely copy the given ip string to sockaddr_str, classify to AF_INET or AF_INET6, and set the port.
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* Data will be written to sockaddr_str even if an error is returned.
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* \param[out] sockaddr_str The instance to copy to.
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* \param[in] ip Valid IP address string.
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* \param[in] port Port number.
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* \return 0 on success, negative if copying the address string failed (e.g. too long), if the address family could
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* not be detected (i.e. if osmo_ip_str_type() returned AF_UNSPEC), or if sockaddr_str is NULL.
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*/
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int osmo_sockaddr_str_from_str(struct osmo_sockaddr_str *sockaddr_str, const char *ip, uint16_t port)
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{
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int rc;
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if (!sockaddr_str)
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return -ENOSPC;
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if (!ip)
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ip = "";
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*sockaddr_str = (struct osmo_sockaddr_str){
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.af = osmo_ip_str_type(ip),
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.port = port,
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};
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rc = osmo_strlcpy(sockaddr_str->ip, ip, sizeof(sockaddr_str->ip));
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if (rc <= 0)
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return -EIO;
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if (rc >= sizeof(sockaddr_str->ip))
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return -ENOSPC;
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if (sockaddr_str->af == AF_UNSPEC)
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return -EINVAL;
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return 0;
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}
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/*! Convert IPv4 address to osmo_sockaddr_str, and set port.
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* \param[out] sockaddr_str The instance to copy to.
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* \param[in] addr IPv4 address data.
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* \param[in] port Port number.
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* \return 0 on success, negative on error.
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*/
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int osmo_sockaddr_str_from_in_addr(struct osmo_sockaddr_str *sockaddr_str, const struct in_addr *addr, uint16_t port)
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{
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if (!sockaddr_str)
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return -ENOSPC;
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*sockaddr_str = (struct osmo_sockaddr_str){
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.af = AF_INET,
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.port = port,
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};
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if (!inet_ntop(AF_INET, addr, sockaddr_str->ip, sizeof(sockaddr_str->ip)))
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return -ENOSPC;
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return 0;
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}
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/*! Convert IPv6 address to osmo_sockaddr_str, and set port.
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* \param[out] sockaddr_str The instance to copy to.
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* \param[in] addr IPv6 address data.
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* \param[in] port Port number.
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* \return 0 on success, negative on error.
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*/
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int osmo_sockaddr_str_from_in6_addr(struct osmo_sockaddr_str *sockaddr_str, const struct in6_addr *addr, uint16_t port)
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{
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if (!sockaddr_str)
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return -ENOSPC;
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*sockaddr_str = (struct osmo_sockaddr_str){
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.af = AF_INET6,
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.port = port,
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};
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if (!inet_ntop(AF_INET6, addr, sockaddr_str->ip, sizeof(sockaddr_str->ip)))
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return -ENOSPC;
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return 0;
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}
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/*! Convert IPv4 address from 32bit host-byte-order to osmo_sockaddr_str, and set port.
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* \param[out] sockaddr_str The instance to copy to.
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* \param[in] addr 32bit IPv4 address data.
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* \param[in] port Port number.
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* \return 0 on success, negative on error.
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*/
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int osmo_sockaddr_str_from_32(struct osmo_sockaddr_str *sockaddr_str, uint32_t ip, uint16_t port)
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{
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struct in_addr addr;
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if (!sockaddr_str)
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return -ENOSPC;
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addr.s_addr = ip;
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return osmo_sockaddr_str_from_in_addr(sockaddr_str, &addr, port);
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}
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/*! Convert IPv4 address from 32bit network-byte-order to osmo_sockaddr_str, and set port.
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* \param[out] sockaddr_str The instance to copy to.
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* \param[in] addr 32bit IPv4 address data.
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* \param[in] port Port number.
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* \return 0 on success, negative on error.
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*/
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int osmo_sockaddr_str_from_32n(struct osmo_sockaddr_str *sockaddr_str, uint32_t ip, uint16_t port)
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{
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if (!sockaddr_str)
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return -ENOSPC;
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return osmo_sockaddr_str_from_32(sockaddr_str, osmo_ntohl(ip), port);
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}
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/*! Convert IPv4 address and port to osmo_sockaddr_str.
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* \param[out] sockaddr_str The instance to copy to.
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* \param[in] src IPv4 address and port data.
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* \return 0 on success, negative on error.
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*/
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int osmo_sockaddr_str_from_sockaddr_in(struct osmo_sockaddr_str *sockaddr_str, const struct sockaddr_in *src)
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{
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if (!sockaddr_str)
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return -ENOSPC;
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if (!src)
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return -EINVAL;
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if (src->sin_family != AF_INET)
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return -EINVAL;
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return osmo_sockaddr_str_from_in_addr(sockaddr_str, &src->sin_addr, osmo_ntohs(src->sin_port));
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}
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/*! Convert IPv6 address and port to osmo_sockaddr_str.
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* \param[out] sockaddr_str The instance to copy to.
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* \param[in] src IPv6 address and port data.
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* \return 0 on success, negative on error.
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*/
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int osmo_sockaddr_str_from_sockaddr_in6(struct osmo_sockaddr_str *sockaddr_str, const struct sockaddr_in6 *src)
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{
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if (!sockaddr_str)
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return -ENOSPC;
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if (!src)
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return -EINVAL;
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if (src->sin6_family != AF_INET6)
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return -EINVAL;
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return osmo_sockaddr_str_from_in6_addr(sockaddr_str, &src->sin6_addr, osmo_ntohs(src->sin6_port));
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}
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/*! Convert IPv4 or IPv6 address and port to osmo_sockaddr_str.
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* \param[out] sockaddr_str The instance to copy to.
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* \param[in] src IPv4 or IPv6 address and port data.
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* \return 0 on success, negative if src does not indicate AF_INET nor AF_INET6 (or if the conversion fails, which
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* should not be possible in practice).
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*/
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int osmo_sockaddr_str_from_sockaddr(struct osmo_sockaddr_str *sockaddr_str, const struct sockaddr_storage *src)
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{
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const struct sockaddr_in *sin = (void*)src;
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const struct sockaddr_in6 *sin6 = (void*)src;
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if (!sockaddr_str)
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return -ENOSPC;
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if (!src)
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return -EINVAL;
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if (sin->sin_family == AF_INET)
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return osmo_sockaddr_str_from_sockaddr_in(sockaddr_str, sin);
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if (sin6->sin6_family == AF_INET6)
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return osmo_sockaddr_str_from_sockaddr_in6(sockaddr_str, sin6);
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return -EINVAL;
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}
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/*! Convert osmo_sockaddr_str address string to IPv4 address data.
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* \param[in] sockaddr_str The instance to convert the IP of.
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* \param[out] dst IPv4 address data to write to.
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* \return 0 on success, negative on error (e.g. invalid IPv4 address string).
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*/
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int osmo_sockaddr_str_to_in_addr(const struct osmo_sockaddr_str *sockaddr_str, struct in_addr *dst)
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{
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int rc;
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if (!sockaddr_str)
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return -EINVAL;
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if (!dst)
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return -ENOSPC;
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if (sockaddr_str->af != AF_INET)
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return -EAFNOSUPPORT;
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rc = inet_pton(AF_INET, sockaddr_str->ip, dst);
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if (rc != 1)
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return -EINVAL;
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return 0;
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}
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/*! Convert osmo_sockaddr_str address string to IPv6 address data.
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* \param[in] sockaddr_str The instance to convert the IP of.
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* \param[out] dst IPv6 address data to write to.
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* \return 0 on success, negative on error (e.g. invalid IPv6 address string).
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*/
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int osmo_sockaddr_str_to_in6_addr(const struct osmo_sockaddr_str *sockaddr_str, struct in6_addr *dst)
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{
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int rc;
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if (!sockaddr_str)
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return -EINVAL;
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if (!dst)
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return -ENOSPC;
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if (sockaddr_str->af != AF_INET6)
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return -EINVAL;
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rc = inet_pton(AF_INET6, sockaddr_str->ip, dst);
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if (rc != 1)
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return -EINVAL;
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return 0;
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}
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/*! Convert osmo_sockaddr_str address string to IPv4 address data in host-byte-order.
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* \param[in] sockaddr_str The instance to convert the IP of.
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* \param[out] dst IPv4 address data in 32bit host-byte-order format to write to.
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* \return 0 on success, negative on error (e.g. invalid IPv4 address string).
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*/
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int osmo_sockaddr_str_to_32(const struct osmo_sockaddr_str *sockaddr_str, uint32_t *ip)
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{
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int rc;
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struct in_addr addr;
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if (!sockaddr_str)
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return -EINVAL;
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if (!ip)
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return -ENOSPC;
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rc = osmo_sockaddr_str_to_in_addr(sockaddr_str, &addr);
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if (rc)
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return rc;
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*ip = addr.s_addr;
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return 0;
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}
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/*! Convert osmo_sockaddr_str address string to IPv4 address data in network-byte-order.
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* \param[in] sockaddr_str The instance to convert the IP of.
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* \param[out] dst IPv4 address data in 32bit network-byte-order format to write to.
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* \return 0 on success, negative on error (e.g. invalid IPv4 address string).
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*/
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int osmo_sockaddr_str_to_32n(const struct osmo_sockaddr_str *sockaddr_str, uint32_t *ip)
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{
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int rc;
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uint32_t ip_h;
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if (!sockaddr_str)
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return -EINVAL;
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if (!ip)
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return -ENOSPC;
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rc = osmo_sockaddr_str_to_32(sockaddr_str, &ip_h);
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if (rc)
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return rc;
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*ip = osmo_htonl(ip_h);
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return 0;
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}
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/*! Convert osmo_sockaddr_str address string and port to IPv4 address and port data.
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* \param[in] sockaddr_str The instance to convert the IP and port of.
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* \param[out] dst IPv4 address and port data to write to.
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* \return 0 on success, negative on error (e.g. invalid IPv4 address string).
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*/
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int osmo_sockaddr_str_to_sockaddr_in(const struct osmo_sockaddr_str *sockaddr_str, struct sockaddr_in *dst)
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{
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if (!sockaddr_str)
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return -EINVAL;
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if (!dst)
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return -ENOSPC;
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if (sockaddr_str->af != AF_INET)
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return -EINVAL;
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*dst = (struct sockaddr_in){
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.sin_family = sockaddr_str->af,
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.sin_port = osmo_htons(sockaddr_str->port),
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};
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return osmo_sockaddr_str_to_in_addr(sockaddr_str, &dst->sin_addr);
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}
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/*! Convert osmo_sockaddr_str address string and port to IPv6 address and port data.
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* \param[in] sockaddr_str The instance to convert the IP and port of.
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* \param[out] dst IPv6 address and port data to write to.
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* \return 0 on success, negative on error (e.g. invalid IPv6 address string).
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*/
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int osmo_sockaddr_str_to_sockaddr_in6(const struct osmo_sockaddr_str *sockaddr_str, struct sockaddr_in6 *dst)
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{
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if (!sockaddr_str)
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return -EINVAL;
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if (!dst)
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return -ENOSPC;
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if (sockaddr_str->af != AF_INET6)
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return -EINVAL;
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*dst = (struct sockaddr_in6){
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.sin6_family = sockaddr_str->af,
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.sin6_port = osmo_htons(sockaddr_str->port),
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};
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return osmo_sockaddr_str_to_in6_addr(sockaddr_str, &dst->sin6_addr);
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}
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/*! Convert osmo_sockaddr_str address string and port to IPv4 or IPv6 address and port data.
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* Depending on sockaddr_str->af, dst will be handled as struct sockaddr_in or struct sockaddr_in6.
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* \param[in] sockaddr_str The instance to convert the IP and port of.
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* \param[out] dst IPv4/IPv6 address and port data to write to.
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* \return 0 on success, negative on error (e.g. invalid IP address string for the family indicated by sockaddr_str->af).
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*/
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int osmo_sockaddr_str_to_sockaddr(const struct osmo_sockaddr_str *sockaddr_str, struct sockaddr_storage *dst)
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{
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if (!sockaddr_str)
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return -EINVAL;
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if (!dst)
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return -ENOSPC;
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switch (sockaddr_str->af) {
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case AF_INET:
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return osmo_sockaddr_str_to_sockaddr_in(sockaddr_str, (void*)dst);
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case AF_INET6:
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return osmo_sockaddr_str_to_sockaddr_in6(sockaddr_str, (void*)dst);
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default:
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return -EINVAL;
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}
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}
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/*! @} */
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#endif // HAVE_NETINET_IN_H
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