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92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
/* Fastinit (finit) ifconfig() implementation.
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*
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* Copyright (c) 2008 Claudio Matsuoka <http://helllabs.org/finit/>
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* Copyright (C) 2009-2014 Joachim Nilsson <joachim.nilsson@westermo.se>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <arpa/inet.h>
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#include <errno.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <unistd.h>
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extern size_t strlcpy(char *dst, const char *src, size_t siz);
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/**
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* ifconfig - Basic ifconfig like operations on an interface
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* @ifname: Name of interface to operate on
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* @addr: If @up then set this optional IPv4 address
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* @mask: If @up and @addr, and @addr is not INADDR_ANY, then set netmask
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* @up: Control %IFF_UP flag on interface
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*
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* Returns:
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* POSIX OK(0) on success, or non-zero on error.
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*/
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int ifconfig(char *ifname, char *addr, char *mask, int up)
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{
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int sd, ret = -1;
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struct ifreq ifr;
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struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
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if ((sd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP)) < 0)
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return -1;
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memset(&ifr, 0, sizeof (ifr));
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strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
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ifr.ifr_addr.sa_family = AF_INET;
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if (up) {
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if (addr) {
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if (inet_pton(AF_INET, addr, &sin->sin_addr) == 1)
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ret = ioctl(sd, SIOCSIFADDR, &ifr);
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}
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/* Non-zero IP address */
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if (mask && addr && strcmp(addr, "0.0.0.0")) {
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if (inet_pton(AF_INET, mask, &sin->sin_addr) == -1)
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ret = ioctl(sd, SIOCSIFNETMASK, &ifr);
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}
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}
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if (!ioctl(sd, SIOCGIFFLAGS, &ifr)) {
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if (up)
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ifr.ifr_flags |= IFF_UP;
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else
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ifr.ifr_flags &= ~IFF_UP;
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ret = ioctl(sd, SIOCSIFFLAGS, &ifr);
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}
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close(sd);
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return ret;
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}
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/**
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* Local Variables:
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* indent-tabs-mode: t
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* c-file-style: "linux"
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* End:
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*/
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