Annotation of embedaddon/libnet/src/libnet_resolve.c, revision 1.1
1.1 ! misho 1: /*
! 2: * $Id: libnet_resolve.c,v 1.20 2004/03/04 20:52:26 kkuehl Exp $
! 3: *
! 4: * libnet
! 5: * libnet_resolve.c - various name resolution type routines
! 6: *
! 7: * Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
! 8: * All rights reserved.
! 9: *
! 10: * Redistribution and use in source and binary forms, with or without
! 11: * modification, are permitted provided that the following conditions
! 12: * are met:
! 13: * 1. Redistributions of source code must retain the above copyright
! 14: * notice, this list of conditions and the following disclaimer.
! 15: * 2. Redistributions in binary form must reproduce the above copyright
! 16: * notice, this list of conditions and the following disclaimer in the
! 17: * documentation and/or other materials provided with the distribution.
! 18: *
! 19: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
! 20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 22: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
! 23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 29: * SUCH DAMAGE.
! 30: *
! 31: */
! 32:
! 33: #if (HAVE_CONFIG_H)
! 34: #include "../include/config.h"
! 35: #endif
! 36: #if (!(_WIN32) || (__CYGWIN__))
! 37: #include "../include/libnet.h"
! 38: #else
! 39: #include "../include/win32/libnet.h"
! 40: #endif
! 41:
! 42: char *
! 43: libnet_addr2name4(u_int32_t in, u_int8_t use_name)
! 44: {
! 45: #define HOSTNAME_SIZE 512
! 46: static char hostname[HOSTNAME_SIZE+1], hostname2[HOSTNAME_SIZE+1];
! 47: static u_int16_t which;
! 48: u_int8_t *p;
! 49:
! 50: struct hostent *host_ent = NULL;
! 51: struct in_addr addr;
! 52:
! 53: /*
! 54: * Swap to the other buffer. We swap static buffers to avoid having to
! 55: * pass in a int8_t *. This makes the code that calls this function more
! 56: * intuitive, but makes this function ugly. This function is seriously
! 57: * non-reentrant. For threaded applications (or for signal handler code)
! 58: * use host_lookup_r().
! 59: */
! 60: which++;
! 61:
! 62: if (use_name == LIBNET_RESOLVE)
! 63: {
! 64: addr.s_addr = in;
! 65: host_ent = gethostbyaddr((int8_t *)&addr, sizeof(struct in_addr), AF_INET);
! 66: /* if this fails, we silently ignore the error and move to plan b! */
! 67: }
! 68: if (!host_ent)
! 69: {
! 70:
! 71: p = (u_int8_t *)∈
! 72: snprintf(((which % 2) ? hostname : hostname2), HOSTNAME_SIZE,
! 73: "%d.%d.%d.%d",
! 74: (p[0] & 255), (p[1] & 255), (p[2] & 255), (p[3] & 255));
! 75: }
! 76: else if (use_name == LIBNET_RESOLVE)
! 77: {
! 78: char *ptr = ((which % 2) ? hostname : hostname2);
! 79: strncpy(ptr, host_ent->h_name, HOSTNAME_SIZE);
! 80: ptr[HOSTNAME_SIZE] = '\0';
! 81:
! 82: }
! 83: return (which % 2) ? (hostname) : (hostname2);
! 84: }
! 85:
! 86: void
! 87: libnet_addr2name4_r(u_int32_t in, u_int8_t use_name, char *hostname,
! 88: int hostname_len)
! 89: {
! 90: u_int8_t *p;
! 91: struct hostent *host_ent = NULL;
! 92: struct in_addr addr;
! 93:
! 94: if (use_name == LIBNET_RESOLVE)
! 95: {
! 96: addr.s_addr = in;
! 97: host_ent = gethostbyaddr((int8_t *)&addr, sizeof(struct in_addr),
! 98: AF_INET);
! 99: }
! 100: if (!host_ent)
! 101: {
! 102: p = (u_int8_t *)∈
! 103: snprintf(hostname, hostname_len, "%d.%d.%d.%d",
! 104: (p[0] & 255), (p[1] & 255), (p[2] & 255), (p[3] & 255));
! 105: }
! 106: else
! 107: {
! 108: strncpy(hostname, host_ent->h_name, hostname_len - 1);
! 109: hostname[sizeof(hostname) - 1] = '\0';
! 110: }
! 111: }
! 112:
! 113: u_int32_t
! 114: libnet_name2addr4(libnet_t *l, char *host_name, u_int8_t use_name)
! 115: {
! 116: struct in_addr addr;
! 117: struct hostent *host_ent;
! 118: u_int32_t m;
! 119: u_int val;
! 120: int i;
! 121:
! 122: if (use_name == LIBNET_RESOLVE)
! 123: {
! 124: if ((addr.s_addr = inet_addr(host_name)) == -1)
! 125: {
! 126: if (!(host_ent = gethostbyname(host_name)))
! 127: {
! 128: snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
! 129: "%s(): %s\n", __func__, strerror(errno));
! 130: /* XXX - this is actually 255.255.255.255 */
! 131: return (-1);
! 132: }
! 133: memcpy(&addr.s_addr, host_ent->h_addr, host_ent->h_length);
! 134: }
! 135: /* network byte order */
! 136: return (addr.s_addr);
! 137: }
! 138: else
! 139: {
! 140: /*
! 141: * We only want dots 'n decimals.
! 142: */
! 143: if (!isdigit(host_name[0]))
! 144: {
! 145: if (l)
! 146: {
! 147: snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
! 148: "%s(): expecting dots and decimals\n", __func__);
! 149: }
! 150: /* XXX - this is actually 255.255.255.255 */
! 151: return (-1);
! 152: }
! 153:
! 154: m = 0;
! 155: for (i = 0; i < 4; i++)
! 156: {
! 157: m <<= 8;
! 158: if (*host_name)
! 159: {
! 160: val = 0;
! 161: while (*host_name && *host_name != '.')
! 162: {
! 163: val *= 10;
! 164: val += *host_name - '0';
! 165: if (val > 255)
! 166: {
! 167: if (l)
! 168: {
! 169: snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
! 170: "%s(): value greater than 255\n", __func__);
! 171: }
! 172: /* XXX - this is actually 255.255.255.255 */
! 173: return (-1);
! 174: }
! 175: host_name++;
! 176: }
! 177: m |= val;
! 178: if (*host_name)
! 179: {
! 180: host_name++;
! 181: }
! 182: }
! 183: }
! 184: /* host byte order */
! 185: return (ntohl(m));
! 186: }
! 187: }
! 188:
! 189: void
! 190: libnet_addr2name6_r(struct libnet_in6_addr addr, u_int8_t use_name,
! 191: char *host_name, int host_name_len)
! 192: {
! 193: struct hostent *host_ent = NULL;
! 194:
! 195: if (use_name == LIBNET_RESOLVE)
! 196: {
! 197: #ifdef HAVE_SOLARIS
! 198: #ifdef HAVE_SOLARIS_IPV6
! 199: host_ent = getipnodebyaddr((int8_t *)&addr, sizeof(struct in_addr),
! 200: AF_INET6, NULL);
! 201: #else
! 202: /* XXX - Gah! Can't report error! */
! 203: host_ent = NULL;
! 204: #endif
! 205: #else
! 206: host_ent = gethostbyaddr((int8_t *)&addr, sizeof(struct in_addr),
! 207: AF_INET6);
! 208: #endif
! 209: }
! 210: if (!host_ent)
! 211: {
! 212: #if !defined(__WIN32__) /* Silence Win32 warning */
! 213: inet_ntop(AF_INET6, &addr, host_name, host_name_len);
! 214: #endif
! 215: }
! 216: else
! 217: {
! 218: strncpy(host_name, host_ent->h_name, host_name_len -1);
! 219: host_name[sizeof(host_name) - 1] = '\0';
! 220: }
! 221: }
! 222:
! 223: const struct libnet_in6_addr in6addr_error = IN6ADDR_ERROR_INIT;
! 224:
! 225: struct libnet_in6_addr
! 226: libnet_name2addr6(libnet_t *l, char *host_name, u_int8_t use_name)
! 227: {
! 228: #if !defined (__WIN32__)
! 229: struct libnet_in6_addr addr;
! 230: struct hostent *host_ent;
! 231: #endif
! 232:
! 233: if (use_name == LIBNET_RESOLVE)
! 234: {
! 235: #ifdef __WIN32__
! 236: /* XXX - we don't support this yet */
! 237: if (l)
! 238: {
! 239: snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
! 240: "%s(): can't resolve IPv6 addresses\n", __func__);
! 241: }
! 242: return (in6addr_error);
! 243: #else
! 244: #ifdef HAVE_SOLARIS
! 245: #ifdef HAVE_SOLARIS_IPV6
! 246: if (!(host_ent = getipnodebyname((int8_t *)&addr,
! 247: sizeof(struct in_addr), AF_INET6, NULL)))
! 248: #else
! 249: snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
! 250: "%s(): %s\n", __func__, strerror(errno));
! 251: return (in6addr_error);
! 252: #endif
! 253: #else
! 254: if (!(host_ent = gethostbyname2(host_name, AF_INET6)))
! 255: #endif
! 256: {
! 257: snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
! 258: "%s(): %s", __func__, strerror(errno));
! 259: return (in6addr_error);
! 260: }
! 261: memcpy(&addr, host_ent->h_addr, host_ent->h_length);
! 262: return (addr);
! 263: #endif /* !__WIN32__ */
! 264: }
! 265: else
! 266: {
! 267: #if defined(__WIN32__) /* Silence Win32 warning */
! 268: if (l)
! 269: {
! 270: snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
! 271: "%s(): can't resolve IPv6 addresses.\n", __func__);
! 272: }
! 273: return (in6addr_error);
! 274: #else
! 275: if(!inet_pton(AF_INET6, host_name, &addr))
! 276: {
! 277: if (l)
! 278: {
! 279: snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
! 280: "%s(): invalid IPv6 address\n", __func__);
! 281: }
! 282: return (in6addr_error);
! 283: }
! 284: return (addr);
! 285: #endif
! 286: }
! 287: }
! 288:
! 289: struct libnet_in6_addr
! 290: libnet_get_ipaddr6(libnet_t *l)
! 291: {
! 292: snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
! 293: "%s(): not yet Implemented\n", __func__);
! 294: return (in6addr_error);
! 295: }
! 296:
! 297: #if !defined(__WIN32__)
! 298: u_int32_t
! 299: libnet_get_ipaddr4(libnet_t *l)
! 300: {
! 301: struct ifreq ifr;
! 302: register struct sockaddr_in *sin;
! 303: int fd;
! 304:
! 305: if (l == NULL)
! 306: {
! 307: return (-1);
! 308: }
! 309:
! 310: /* create dummy socket to perform an ioctl upon */
! 311: fd = socket(PF_INET, SOCK_DGRAM, 0);
! 312: if (fd == -1)
! 313: {
! 314: snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
! 315: "%s(): socket(): %s\n", __func__, strerror(errno));
! 316: return (-1);
! 317: }
! 318:
! 319: sin = (struct sockaddr_in *)&ifr.ifr_addr;
! 320:
! 321: if (l->device == NULL)
! 322: {
! 323: if (libnet_select_device(l) == -1)
! 324: {
! 325: /* error msg set in libnet_select_device() */
! 326: close(fd);
! 327: return (-1);
! 328: }
! 329: }
! 330: strncpy(ifr.ifr_name, l->device, sizeof(ifr.ifr_name) -1);
! 331: ifr.ifr_name[sizeof(ifr.ifr_name) - 1] = '\0';
! 332:
! 333: ifr.ifr_addr.sa_family = AF_INET;
! 334:
! 335: if (ioctl(fd, SIOCGIFADDR, (int8_t*) &ifr) < 0)
! 336: {
! 337: snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
! 338: "%s(): ioctl(): %s\n", __func__, strerror(errno));
! 339: close(fd);
! 340: return (-1);
! 341: }
! 342: close(fd);
! 343: return (sin->sin_addr.s_addr);
! 344: }
! 345: #else
! 346: #include <Packet32.h>
! 347: u_int32_t
! 348: libnet_get_ipaddr4(libnet_t *l)
! 349: {
! 350: long npflen = 0;
! 351: struct sockaddr_in sin;
! 352: struct npf_if_addr ipbuff;
! 353:
! 354: memset(&sin,0,sizeof(sin));
! 355: memset(&ipbuff,0,sizeof(ipbuff));
! 356:
! 357: npflen = sizeof(ipbuff);
! 358: if (PacketGetNetInfoEx(l->device, &ipbuff, &npflen))
! 359: {
! 360: sin = *(struct sockaddr_in *)&ipbuff.IPAddress;
! 361: }
! 362: return (sin.sin_addr.s_addr);
! 363: }
! 364: #endif /* WIN32 */
! 365:
! 366: u_int8_t *
! 367: libnet_hex_aton(int8_t *s, int *len)
! 368: {
! 369: u_int8_t *buf;
! 370: int i;
! 371: int32_t l;
! 372: int8_t *pp;
! 373:
! 374: while (isspace(*s))
! 375: {
! 376: s++;
! 377: }
! 378: for (i = 0, *len = 0; s[i]; i++)
! 379: {
! 380: if (s[i] == ':')
! 381: {
! 382: (*len)++;
! 383: }
! 384: }
! 385: buf = malloc(*len + 1);
! 386: if (buf == NULL)
! 387: {
! 388: return (NULL);
! 389: }
! 390: /* expect len hex octets separated by ':' */
! 391: for (i = 0; i < *len + 1; i++)
! 392: {
! 393: l = strtol(s, (char **)&pp, 16);
! 394: if (pp == s || l > 0xff || l < 0)
! 395: {
! 396: *len = 0;
! 397: free(buf);
! 398: return (NULL);
! 399: }
! 400: if (!(*pp == ':' || (i == *len && (isspace(*pp) || *pp == '\0'))))
! 401: {
! 402: *len = 0;
! 403: free(buf);
! 404: return (NULL);
! 405: }
! 406: buf[i] = (u_int8_t)l;
! 407: s = pp + 1;
! 408: }
! 409: /* return int8_tacter after the octets ala strtol(3) */
! 410: (*len)++;
! 411: return (buf);
! 412: }
! 413:
! 414: /* EOF */
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/cvsweb/back.gif){kind=icon}
Return to libnet_resolve.c CVS log ![[TXT]](/icons/cvsweb/text.gif){kind=icon}
![[DIR]](/icons/cvsweb/dir.gif){kind=icon}
Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / libnet / src