Annotation of embedaddon/libpdel/net/if_iface.c, revision 1.1
1.1 ! misho 1:
! 2: /*
! 3: * Copyright (c) 2001-2002 Packet Design, LLC.
! 4: * All rights reserved.
! 5: *
! 6: * Subject to the following obligations and disclaimer of warranty,
! 7: * use and redistribution of this software, in source or object code
! 8: * forms, with or without modifications are expressly permitted by
! 9: * Packet Design; provided, however, that:
! 10: *
! 11: * (i) Any and all reproductions of the source or object code
! 12: * must include the copyright notice above and the following
! 13: * disclaimer of warranties; and
! 14: * (ii) No rights are granted, in any manner or form, to use
! 15: * Packet Design trademarks, including the mark "PACKET DESIGN"
! 16: * on advertising, endorsements, or otherwise except as such
! 17: * appears in the above copyright notice or in the software.
! 18: *
! 19: * THIS SOFTWARE IS BEING PROVIDED BY PACKET DESIGN "AS IS", AND
! 20: * TO THE MAXIMUM EXTENT PERMITTED BY LAW, PACKET DESIGN MAKES NO
! 21: * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING
! 22: * THIS SOFTWARE, INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED
! 23: * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE,
! 24: * OR NON-INFRINGEMENT. PACKET DESIGN DOES NOT WARRANT, GUARANTEE,
! 25: * OR MAKE ANY REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS
! 26: * OF THE USE OF THIS SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY,
! 27: * RELIABILITY OR OTHERWISE. IN NO EVENT SHALL PACKET DESIGN BE
! 28: * LIABLE FOR ANY DAMAGES RESULTING FROM OR ARISING OUT OF ANY USE
! 29: * OF THIS SOFTWARE, INCLUDING WITHOUT LIMITATION, ANY DIRECT,
! 30: * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, PUNITIVE, OR CONSEQUENTIAL
! 31: * DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, LOSS OF
! 32: * USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY THEORY OF
! 33: * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
! 34: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
! 35: * THE USE OF THIS SOFTWARE, EVEN IF PACKET DESIGN IS ADVISED OF
! 36: * THE POSSIBILITY OF SUCH DAMAGE.
! 37: *
! 38: * Author: Archie Cobbs <archie@freebsd.org>
! 39: */
! 40:
! 41: #include <sys/types.h>
! 42: #include <sys/param.h>
! 43: #include <sys/socket.h>
! 44: #include <sys/sysctl.h>
! 45: #include <sys/sockio.h>
! 46:
! 47: #include <net/if.h>
! 48: #include <net/if_dl.h>
! 49: #include <net/route.h>
! 50:
! 51: #include <netinet/in.h>
! 52: #include <arpa/inet.h>
! 53:
! 54: #include <stdio.h>
! 55: #include <stdlib.h>
! 56: #include <stdarg.h>
! 57: #include <unistd.h>
! 58: #include <string.h>
! 59: #include <errno.h>
! 60: #include <err.h>
! 61:
! 62: #include "structs/structs.h"
! 63: #include "structs/type/array.h"
! 64:
! 65: #include "util/typed_mem.h"
! 66: #include "net/if_util.h"
! 67:
! 68: #define ROUNDUP(a) \
! 69: ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
! 70: #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
! 71:
! 72: static struct if_msghdr *if_find(const char *ifname,
! 73: u_char **bufp, const char *mtype);
! 74: static int if_info(u_char **bufp, const char *mtype);
! 75:
! 76: /*
! 77: * Get list of IP addresses and netmasks configured on an interface.
! 78: */
! 79: int
! 80: if_get_ip_addrs(const char *ifname, struct in_addr **iplistp,
! 81: struct in_addr **nmlistp, const char *mtype)
! 82: {
! 83: struct if_msghdr *ifm;
! 84: struct ifa_msghdr *ifam;
! 85: struct in_addr *iplist = NULL;
! 86: struct in_addr *nmlist = NULL;
! 87: int errno_save;
! 88: int num = 0;
! 89: u_char *buf;
! 90:
! 91: /* Find interface info */
! 92: if ((ifm = if_find(ifname, &buf, TYPED_MEM_TEMP)) == NULL)
! 93: return (-1);
! 94:
! 95: /* Search for first IP address */
! 96: for (ifam = (struct ifa_msghdr *)(void *)
! 97: ((u_char *)ifm + ifm->ifm_msglen);
! 98: ifam->ifam_type == RTM_NEWADDR;
! 99: ifam = (struct ifa_msghdr *)(void *)
! 100: ((u_char *)ifam + ifam->ifam_msglen))
! 101: num++;
! 102:
! 103: /* Allocate arrays */
! 104: if ((iplist = MALLOC(mtype, num * sizeof(*iplist))) == NULL
! 105: || (nmlist = MALLOC(mtype, num * sizeof(*nmlist))) == NULL) {
! 106: errno_save = errno;
! 107: FREE(mtype, iplist); /* ok if NULL */
! 108: FREE(TYPED_MEM_TEMP, buf);
! 109: errno = errno_save;
! 110: return (-1);
! 111: }
! 112:
! 113: /* Search for IP address/netmask combinations */
! 114: num = 0;
! 115: for (ifam = (struct ifa_msghdr *)(void *)
! 116: ((u_char *)ifm + ifm->ifm_msglen);
! 117: ifam->ifam_type == RTM_NEWADDR;
! 118: ifam = (struct ifa_msghdr *)(void *)
! 119: ((u_char *)ifam + ifam->ifam_msglen)) {
! 120: char *cp = (char *)(ifam + 1);
! 121: int need = RTA_IFA | RTA_NETMASK;
! 122: int i;
! 123:
! 124: /* Find IP address and netmask, if any */
! 125: if ((ifam->ifam_addrs & need) != need)
! 126: continue;
! 127: for (i = 1; i != 0 && need != 0; i <<= 1) {
! 128: if ((ifam->ifam_addrs & i) == 0)
! 129: continue;
! 130: if (i == RTA_IFA
! 131: && ((struct sockaddr *)(void *)cp)->sa_family
! 132: == AF_INET) {
! 133: iplist[num] = ((struct sockaddr_in *)
! 134: (void *)cp)->sin_addr;
! 135: } else if (i == RTA_NETMASK) {
! 136: nmlist[num] = ((struct sockaddr_in *)
! 137: (void *)cp)->sin_addr;
! 138: }
! 139: need &= ~i;
! 140: ADVANCE(cp, (struct sockaddr *)cp);
! 141: }
! 142: if (need == 0)
! 143: num++;
! 144: }
! 145:
! 146: /* Done */
! 147: FREE(TYPED_MEM_TEMP, buf);
! 148: *iplistp = iplist;
! 149: *nmlistp = nmlist;
! 150: return (num);
! 151: }
! 152:
! 153: /*
! 154: * Get the first IP address on an interface.
! 155: */
! 156: int
! 157: if_get_ip_addr(const char *ifname, struct in_addr *ipp, struct in_addr *nmp)
! 158: {
! 159: struct in_addr *iplist;
! 160: struct in_addr *nmlist;
! 161: int nip;
! 162:
! 163: if ((nip = if_get_ip_addrs(ifname,
! 164: &iplist, &nmlist, TYPED_MEM_TEMP)) == -1)
! 165: return (-1);
! 166: if (nip == 0) {
! 167: FREE(TYPED_MEM_TEMP, iplist);
! 168: FREE(TYPED_MEM_TEMP, nmlist);
! 169: errno = ENOENT;
! 170: return (-1);
! 171: }
! 172: if (ipp != NULL)
! 173: *ipp = iplist[0];
! 174: if (nmp != NULL)
! 175: *nmp = nmlist[0];
! 176: FREE(TYPED_MEM_TEMP, iplist);
! 177: FREE(TYPED_MEM_TEMP, nmlist);
! 178: return (0);
! 179: }
! 180:
! 181: /*
! 182: * Get the flags associated with an interface.
! 183: */
! 184: int
! 185: if_get_flags(const char *ifname)
! 186: {
! 187: struct if_msghdr *ifm;
! 188: u_char *buf;
! 189: int rtn;
! 190:
! 191: if ((ifm = if_find(ifname, &buf, TYPED_MEM_TEMP)) == NULL)
! 192: return (-1);
! 193: rtn = ifm->ifm_flags;
! 194: FREE(TYPED_MEM_TEMP, buf);
! 195: return (rtn);
! 196: }
! 197:
! 198: /*
! 199: * Set the flags associated with an interface.
! 200: */
! 201: int
! 202: if_set_flags(const char *ifname, int flags)
! 203: {
! 204: struct ifreq ifr;
! 205: int r;
! 206: int s;
! 207:
! 208: if ((s = socket(PF_INET, SOCK_DGRAM, 0)) == -1)
! 209: return (-1);
! 210: memset(&ifr, 0, sizeof(ifr));
! 211: strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
! 212: ifr.ifr_flags = flags;
! 213: r = ioctl(s, SIOCSIFFLAGS, (char *)&ifr);
! 214: (void)close(s);
! 215: return (r);
! 216: }
! 217:
! 218: /*
! 219: * Get the MTU associated with an interface.
! 220: */
! 221: int
! 222: if_get_mtu(const char *ifname)
! 223: {
! 224: struct if_msghdr *ifm;
! 225: u_char *buf;
! 226: int rtn;
! 227:
! 228: if ((ifm = if_find(ifname, &buf, TYPED_MEM_TEMP)) == NULL)
! 229: return (-1);
! 230: rtn = ifm->ifm_data.ifi_mtu;
! 231: FREE(TYPED_MEM_TEMP, buf);
! 232: return (rtn);
! 233: }
! 234:
! 235: /*
! 236: * Set the MTU associated with an interface.
! 237: */
! 238: int
! 239: if_set_mtu(const char *ifname, u_int mtu)
! 240: {
! 241: struct ifreq ifr;
! 242: int r;
! 243: int s;
! 244:
! 245: if ((s = socket(PF_INET, SOCK_DGRAM, 0)) == -1)
! 246: return (-1);
! 247: memset(&ifr, 0, sizeof(ifr));
! 248: strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
! 249: ifr.ifr_mtu = mtu;
! 250: r = ioctl(s, SIOCSIFMTU, (char *)&ifr);
! 251: (void)close(s);
! 252: return (r);
! 253: }
! 254:
! 255: /*
! 256: * Get the interface type.
! 257: */
! 258: int
! 259: if_get_type(const char *ifname)
! 260: {
! 261: struct if_msghdr *ifm;
! 262: u_char *buf;
! 263: int rtn;
! 264:
! 265: if ((ifm = if_find(ifname, &buf, TYPED_MEM_TEMP)) == NULL)
! 266: return (-1);
! 267: rtn = ifm->ifm_data.ifi_type;
! 268: FREE(TYPED_MEM_TEMP, buf);
! 269: return (rtn);
! 270: }
! 271:
! 272: /*
! 273: * Get the link address for an interface.
! 274: */
! 275: int
! 276: if_get_link_addr(const char *ifname,
! 277: struct sockaddr_dl **sdlp, const char *mtype)
! 278: {
! 279: struct if_msghdr *ifm;
! 280: struct sockaddr_dl *sdl;
! 281: int errno_save;
! 282: u_char *buf;
! 283:
! 284: if ((ifm = if_find(ifname, &buf, TYPED_MEM_TEMP)) == NULL)
! 285: return (-1);
! 286: sdl = (struct sockaddr_dl *)(ifm + 1);
! 287: if ((*sdlp = MALLOC(mtype, sdl->sdl_len)) == NULL) {
! 288: errno_save = errno;
! 289: FREE(TYPED_MEM_TEMP, buf);
! 290: errno = errno_save;
! 291: return (-1);
! 292: }
! 293: memcpy(*sdlp, sdl, sdl->sdl_len);
! 294: FREE(TYPED_MEM_TEMP, buf);
! 295: return (0);
! 296: }
! 297:
! 298: /*
! 299: * Gets the names of all system interfaces.
! 300: */
! 301: int
! 302: if_get_list(char ***listp, const char *mtype)
! 303: {
! 304: char **list = NULL;
! 305: int errno_save;
! 306: int num = 0;
! 307: u_char *buf;
! 308: u_char *ptr;
! 309: int len;
! 310:
! 311: /* Get raw data from kernel */
! 312: if ((len = if_info(&buf, TYPED_MEM_TEMP)) == -1)
! 313: return (-1);
! 314:
! 315: /* Scan interfaces */
! 316: for (ptr = buf;
! 317: ptr < buf + len;
! 318: ptr += ((struct if_msghdr *)(void *)ptr)->ifm_msglen) {
! 319: struct if_msghdr *const ifm = (struct if_msghdr *)(void *)ptr;
! 320:
! 321: /* Sanity check version */
! 322: if (ifm->ifm_version != RTM_VERSION) {
! 323: errno = EIO;
! 324: goto fail;
! 325: }
! 326:
! 327: /* Next interface? */
! 328: if (ifm->ifm_type == RTM_IFINFO) {
! 329: struct sockaddr_dl *const sdl
! 330: = (struct sockaddr_dl *)(ifm + 1);
! 331: char nbuf[IF_NAMESIZE + 1];
! 332: void *new_list;
! 333:
! 334: /* Get name */
! 335: if (sdl->sdl_nlen > sizeof(nbuf) - 1)
! 336: continue;
! 337: memcpy(nbuf, sdl->sdl_data, sdl->sdl_nlen);
! 338: nbuf[sdl->sdl_nlen] = '\0';
! 339:
! 340: /* Add name to list */
! 341: if ((new_list = REALLOC(mtype, list,
! 342: (num + 1) * sizeof(*list))) == NULL)
! 343: goto fail;
! 344: list = new_list;
! 345: if ((list[num] = STRDUP(mtype, nbuf)) == NULL)
! 346: goto fail;
! 347: num++;
! 348: }
! 349: }
! 350:
! 351: /* Done */
! 352: FREE(TYPED_MEM_TEMP, buf);
! 353: *listp = list;
! 354: return (num);
! 355:
! 356: fail:
! 357: errno_save = errno;
! 358: while (num > 0)
! 359: FREE(mtype, list[--num]);
! 360: FREE(mtype, list);
! 361: FREE(TYPED_MEM_TEMP, buf);
! 362: errno = errno_save;
! 363: return (-1);
! 364: }
! 365:
! 366: /*
! 367: * Get the flags or type associated with an interface.
! 368: * Caller must free *bufp.
! 369: *
! 370: * Returns -1 and sets errno if there was a problem.
! 371: */
! 372: static struct if_msghdr *
! 373: if_find(const char *ifname, u_char **bufp, const char *mtype)
! 374: {
! 375: u_char *buf;
! 376: u_char *ptr;
! 377: size_t len;
! 378:
! 379: /* Get raw data from kernel */
! 380: if ((len = if_info(&buf, mtype)) == -1)
! 381: return (NULL);
! 382:
! 383: /* Scan for desired interface */
! 384: for (ptr = buf;
! 385: ptr < buf + len;
! 386: ptr += ((struct if_msghdr *)(void *)ptr)->ifm_msglen) {
! 387: struct if_msghdr *const ifm = (struct if_msghdr *)(void *)ptr;
! 388: struct sockaddr_dl *sdl;
! 389:
! 390: /* Sanity check version */
! 391: if (ifm->ifm_version != RTM_VERSION) {
! 392: FREE(mtype, buf);
! 393: errno = EIO;
! 394: return (NULL);
! 395: }
! 396:
! 397: /* Next interface or previous interface address? */
! 398: if (ifm->ifm_type != RTM_IFINFO)
! 399: continue;
! 400:
! 401: /* Compare interface name */
! 402: sdl = (struct sockaddr_dl *)(ifm + 1);
! 403: if (strlen(ifname) != sdl->sdl_nlen ||
! 404: strncmp(ifname, sdl->sdl_data, sdl->sdl_nlen) != 0)
! 405: continue;
! 406:
! 407: /* Found it */
! 408: *bufp = buf;
! 409: return (ifm);
! 410: }
! 411:
! 412: /* Not found */
! 413: FREE(mtype, buf);
! 414: errno = ENOENT;
! 415: return (NULL);
! 416: }
! 417:
! 418: /*
! 419: * Get the interface list. Caller must free *bufp.
! 420: */
! 421: static int
! 422: if_info(u_char **bufp, const char *mtype)
! 423: {
! 424: int mib[6] = { CTL_NET, PF_ROUTE, 0, AF_INET, NET_RT_IFLIST, 0 };
! 425: size_t length;
! 426: u_char *buf;
! 427:
! 428: if (sysctl(mib, 6, NULL, &length, NULL, 0) == -1)
! 429: return (-1);
! 430: length += 256;
! 431: if ((buf = MALLOC(mtype, length)) == NULL)
! 432: return (-1);
! 433: if (sysctl(mib, 6, buf, &length, NULL, 0) == -1)
! 434: return (-1);
! 435: *bufp = buf;
! 436: return (length);
! 437: }
! 438:
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