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Annotation of embedaddon/pimd/libite/ifconfig.c, revision 1.1.1.1

1.1       misho       1: /* Fastinit (finit) ifconfig() implementation.
                      2:  *
                      3:  * Copyright (c) 2008 Claudio Matsuoka <http://helllabs.org/finit/>
                      4:  * Copyright (C) 2009-2014  Joachim Nilsson <joachim.nilsson@westermo.se>
                      5:  *
                      6:  * Permission is hereby granted, free of charge, to any person obtaining a copy
                      7:  * of this software and associated documentation files (the "Software"), to deal
                      8:  * in the Software without restriction, including without limitation the rights
                      9:  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
                     10:  * copies of the Software, and to permit persons to whom the Software is
                     11:  * furnished to do so, subject to the following conditions:
                     12:  *
                     13:  * The above copyright notice and this permission notice shall be included in
                     14:  * all copies or substantial portions of the Software.
                     15:  *
                     16:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
                     17:  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
                     18:  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
                     19:  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
                     20:  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
                     21:  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
                     22:  * THE SOFTWARE.
                     23:  */
                     24: 
                     25: #include <arpa/inet.h>
                     26: #include <errno.h>
                     27: #include <net/if.h>
                     28: #include <netinet/in.h>
                     29: #include <string.h>
                     30: #include <sys/ioctl.h>
                     31: #include <sys/socket.h>
                     32: #include <unistd.h>
                     33: 
                     34: extern size_t strlcpy(char *dst, const char *src, size_t siz);
                     35: 
                     36: /**
                     37:  * ifconfig - Basic ifconfig like operations on an interface
                     38:  * @ifname: Name of interface to operate on
                     39:  * @addr:   If @up then set this optional IPv4 address
                     40:  * @mask:   If @up and @addr, and @addr is not INADDR_ANY, then set netmask
                     41:  * @up:     Control %IFF_UP flag on interface
                     42:  *
                     43:  * Returns:
                     44:  * POSIX OK(0) on success, or non-zero on error.
                     45:  */
                     46: int ifconfig(char *ifname, char *addr, char *mask, int up)
                     47: {
                     48:        int sd, ret = -1;
                     49:        struct ifreq ifr;
                     50:        struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
                     51: 
                     52:        if ((sd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP)) < 0)
                     53:                return -1;
                     54: 
                     55:        memset(&ifr, 0, sizeof (ifr));
                     56:        strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
                     57:        ifr.ifr_addr.sa_family = AF_INET;
                     58: 
                     59:        if (up) {
                     60:                if (addr) {
                     61:                        if (inet_pton(AF_INET, addr, &sin->sin_addr) == 1)
                     62:                                ret = ioctl(sd, SIOCSIFADDR, &ifr);
                     63:                }
                     64: 
                     65:                /* Non-zero IP address */
                     66:                if (mask && addr && strcmp(addr, "0.0.0.0")) {
                     67:                        if (inet_pton(AF_INET, mask, &sin->sin_addr) == -1)
                     68:                                ret = ioctl(sd, SIOCSIFNETMASK, &ifr);
                     69:                }
                     70:        }
                     71: 
                     72:        if (!ioctl(sd, SIOCGIFFLAGS, &ifr)) {
                     73:                if (up)
                     74:                        ifr.ifr_flags |=  IFF_UP;
                     75:                else
                     76:                        ifr.ifr_flags &= ~IFF_UP;
                     77: 
                     78:                ret = ioctl(sd, SIOCSIFFLAGS, &ifr);
                     79:        }
                     80: 
                     81:        close(sd);
                     82: 
                     83:        return ret;
                     84: }
                     85: 
                     86: /**
                     87:  * Local Variables:
                     88:  *  version-control: t
                     89:  *  indent-tabs-mode: t
                     90:  *  c-file-style: "linux"
                     91:  * End:
                     92:  */