Annotation of src/usr.bin/sudo/interfaces.c, Revision 1.1
1.1 ! millert 1: /*
! 2: * Copyright (c) 1996, 1998, 1999 Todd C. Miller <Todd.Miller@courtesan.com>
! 3: * All rights reserved.
! 4: *
! 5: * Redistribution and use in source and binary forms, with or without
! 6: * modification, are permitted provided that the following conditions
! 7: * are met:
! 8: *
! 9: * 1. Redistributions of source code must retain the above copyright
! 10: * notice, this list of conditions and the following disclaimer.
! 11: *
! 12: * 2. Redistributions in binary form must reproduce the above copyright
! 13: * notice, this list of conditions and the following disclaimer in the
! 14: * documentation and/or other materials provided with the distribution.
! 15: *
! 16: * 3. The name of the author may not be used to endorse or promote products
! 17: * derived from this software without specific prior written permission.
! 18: *
! 19: * 4. Products derived from this software may not be called "Sudo" nor
! 20: * may "Sudo" appear in their names without specific prior written
! 21: * permission from the author.
! 22: *
! 23: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
! 24: * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
! 25: * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
! 26: * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
! 27: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
! 28: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
! 29: * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
! 30: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
! 31: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
! 32: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 33: */
! 34:
! 35: /*
! 36: * Supress a warning w/ gcc on Digital UN*X.
! 37: * The system headers should really do this....
! 38: */
! 39: #if defined(__osf__) && !defined(__cplusplus)
! 40: struct mbuf;
! 41: struct rtentry;
! 42: #endif
! 43:
! 44: #include "config.h"
! 45:
! 46: #include <stdio.h>
! 47: #ifdef STDC_HEADERS
! 48: #include <stdlib.h>
! 49: #endif /* STDC_HEADERS */
! 50: #ifdef HAVE_UNISTD_H
! 51: #include <unistd.h>
! 52: #endif /* HAVE_UNISTD_H */
! 53: #ifdef HAVE_STRING_H
! 54: #include <string.h>
! 55: #endif /* HAVE_STRING_H */
! 56: #ifdef HAVE_STRINGS_H
! 57: #include <strings.h>
! 58: #endif /* HAVE_STRINGS_H */
! 59: #include <netdb.h>
! 60: #include <errno.h>
! 61: #include <sys/types.h>
! 62: #include <sys/socket.h>
! 63: #include <sys/param.h>
! 64: #include <sys/time.h>
! 65: #include <sys/ioctl.h>
! 66: #if defined(HAVE_SYS_SOCKIO_H) && !defined(SIOCGIFCONF)
! 67: #include <sys/sockio.h>
! 68: #endif
! 69: #ifdef _ISC
! 70: #include <sys/stream.h>
! 71: #include <sys/sioctl.h>
! 72: #include <sys/stropts.h>
! 73: #include <net/errno.h>
! 74: #define STRSET(cmd, param, len) {strioctl.ic_cmd=(cmd);\
! 75: strioctl.ic_dp=(param);\
! 76: strioctl.ic_timout=0;\
! 77: strioctl.ic_len=(len);}
! 78: #endif /* _ISC */
! 79: #ifdef _MIPS
! 80: #include <net/soioctl.h>
! 81: #endif /* _MIPS */
! 82: #include <netinet/in.h>
! 83: #include <arpa/inet.h>
! 84: #include <net/if.h>
! 85:
! 86: #include "sudo.h"
! 87: #include "interfaces.h"
! 88:
! 89: #ifndef lint
! 90: static const char rcsid[] = "$Sudo: interfaces.c,v 1.59 1999/08/12 16:24:09 millert Exp $";
! 91: #endif /* lint */
! 92:
! 93:
! 94: #if defined(SIOCGIFCONF) && !defined(STUB_LOAD_INTERFACES)
! 95: /*
! 96: * Allocate and fill in the interfaces global variable with the
! 97: * machine's ip addresses and netmasks.
! 98: */
! 99: void
! 100: load_interfaces()
! 101: {
! 102: struct ifconf *ifconf;
! 103: struct ifreq *ifr, ifr_tmp;
! 104: struct sockaddr_in *sin;
! 105: int sock, n, i;
! 106: size_t len = sizeof(struct ifconf) + BUFSIZ;
! 107: char *previfname = "", *ifconf_buf = NULL;
! 108: #ifdef _ISC
! 109: struct strioctl strioctl;
! 110: #endif /* _ISC */
! 111:
! 112: sock = socket(AF_INET, SOCK_DGRAM, 0);
! 113: if (sock < 0) {
! 114: (void) fprintf(stderr, "%s: cannot open socket: %s\n",
! 115: Argv[0], strerror(errno));
! 116: exit(1);
! 117: }
! 118:
! 119: /*
! 120: * Get interface configuration or return (leaving num_interfaces 0)
! 121: */
! 122: for (;;) {
! 123: ifconf_buf = erealloc(ifconf_buf, len);
! 124: ifconf = (struct ifconf *) ifconf_buf;
! 125: ifconf->ifc_len = len - sizeof(struct ifconf);
! 126: ifconf->ifc_buf = (caddr_t) (ifconf_buf + sizeof(struct ifconf));
! 127:
! 128: /* Networking may not be installed in kernel... */
! 129: #ifdef _ISC
! 130: STRSET(SIOCGIFCONF, (caddr_t) ifconf, len);
! 131: if (ioctl(sock, I_STR, (caddr_t) &strioctl) < 0) {
! 132: #else
! 133: if (ioctl(sock, SIOCGIFCONF, (caddr_t) ifconf) < 0) {
! 134: #endif /* _ISC */
! 135: free(ifconf_buf);
! 136: (void) close(sock);
! 137: return;
! 138: }
! 139:
! 140: /* Break out of loop if we have a big enough buffer. */
! 141: if (ifconf->ifc_len + sizeof(struct ifreq) < len)
! 142: break;
! 143: len += BUFSIZ;
! 144: }
! 145:
! 146: /* Allocate space for the maximum number of interfaces that could exist. */
! 147: n = ifconf->ifc_len / sizeof(struct ifreq);
! 148: interfaces = (struct interface *) emalloc(sizeof(struct interface) * n);
! 149:
! 150: /* For each interface, store the ip address and netmask. */
! 151: for (i = 0; i < ifconf->ifc_len; ) {
! 152: /* Get a pointer to the current interface. */
! 153: ifr = (struct ifreq *) &ifconf->ifc_buf[i];
! 154:
! 155: /* Set i to the subscript of the next interface. */
! 156: i += sizeof(struct ifreq);
! 157: #ifdef HAVE_SA_LEN
! 158: if (ifr->ifr_addr.sa_len > sizeof(ifr->ifr_addr))
! 159: i += ifr->ifr_addr.sa_len - sizeof(struct sockaddr);
! 160: #endif /* HAVE_SA_LEN */
! 161:
! 162: /* Skip duplicates and interfaces with NULL addresses. */
! 163: sin = (struct sockaddr_in *) &ifr->ifr_addr;
! 164: if (sin->sin_addr.s_addr == 0 ||
! 165: strncmp(previfname, ifr->ifr_name, sizeof(ifr->ifr_name) - 1) == 0)
! 166: continue;
! 167:
! 168: if (ifr->ifr_addr.sa_family != AF_INET)
! 169: continue;
! 170:
! 171: #ifdef SIOCGIFFLAGS
! 172: memset(&ifr_tmp, 0, sizeof(ifr_tmp));
! 173: strncpy(ifr_tmp.ifr_name, ifr->ifr_name, sizeof(ifr_tmp.ifr_name) - 1);
! 174: if (ioctl(sock, SIOCGIFFLAGS, (caddr_t) &ifr_tmp) < 0)
! 175: #endif
! 176: ifr_tmp = *ifr;
! 177:
! 178: /* Skip interfaces marked "down" and "loopback". */
! 179: if (!(ifr_tmp.ifr_flags & IFF_UP) || (ifr_tmp.ifr_flags & IFF_LOOPBACK))
! 180: continue;
! 181:
! 182: sin = (struct sockaddr_in *) &ifr->ifr_addr;
! 183: interfaces[num_interfaces].addr.s_addr = sin->sin_addr.s_addr;
! 184:
! 185: /* Stash the name of the interface we saved. */
! 186: previfname = ifr->ifr_name;
! 187:
! 188: /* Get the netmask. */
! 189: (void) memset(&ifr_tmp, 0, sizeof(ifr_tmp));
! 190: strncpy(ifr_tmp.ifr_name, ifr->ifr_name, sizeof(ifr_tmp.ifr_name) - 1);
! 191: #ifdef SIOCGIFNETMASK
! 192: #ifdef _ISC
! 193: STRSET(SIOCGIFNETMASK, (caddr_t) &ifr_tmp, sizeof(ifr_tmp));
! 194: if (ioctl(sock, I_STR, (caddr_t) &strioctl) == 0) {
! 195: #else
! 196: if (ioctl(sock, SIOCGIFNETMASK, (caddr_t) &ifr_tmp) == 0) {
! 197: #endif /* _ISC */
! 198: sin = (struct sockaddr_in *) &ifr_tmp.ifr_addr;
! 199:
! 200: interfaces[num_interfaces].netmask.s_addr = sin->sin_addr.s_addr;
! 201: } else {
! 202: #else
! 203: {
! 204: #endif /* SIOCGIFNETMASK */
! 205: if (IN_CLASSC(interfaces[num_interfaces].addr.s_addr))
! 206: interfaces[num_interfaces].netmask.s_addr = htonl(IN_CLASSC_NET);
! 207: else if (IN_CLASSB(interfaces[num_interfaces].addr.s_addr))
! 208: interfaces[num_interfaces].netmask.s_addr = htonl(IN_CLASSB_NET);
! 209: else
! 210: interfaces[num_interfaces].netmask.s_addr = htonl(IN_CLASSA_NET);
! 211: }
! 212:
! 213: /* Only now can we be sure it was a good/interesting interface. */
! 214: num_interfaces++;
! 215: }
! 216:
! 217: /* If the expected size < real size, realloc the array. */
! 218: if (n != num_interfaces) {
! 219: if (num_interfaces != 0)
! 220: interfaces = (struct interface *) erealloc(interfaces,
! 221: sizeof(struct interface) * num_interfaces);
! 222: else
! 223: free(interfaces);
! 224: }
! 225: free(ifconf_buf);
! 226: (void) close(sock);
! 227: }
! 228:
! 229: #else /* !SIOCGIFCONF || STUB_LOAD_INTERFACES */
! 230:
! 231: /*
! 232: * Stub function for those without SIOCGIFCONF
! 233: */
! 234: void
! 235: load_interfaces()
! 236: {
! 237: return;
! 238: }
! 239:
! 240: #endif /* SIOCGIFCONF && !STUB_LOAD_INTERFACES */
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