diff options
Diffstat (limited to 'lib/libc/net/if_nameindex.c')
| -rw-r--r-- | lib/libc/net/if_nameindex.c | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/lib/libc/net/if_nameindex.c b/lib/libc/net/if_nameindex.c new file mode 100644 index 00000000000..65bdbde9af7 --- /dev/null +++ b/lib/libc/net/if_nameindex.c @@ -0,0 +1,212 @@ +/* + * %%% copyright-cmetz-98-bsd + * Copyright (c) 1998-1999, Craig Metz, All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by Craig Metz and + * by other contributors. + * 4. Neither the name of the author nor the names of contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by Craig Metz and + * by other contributors. + * 4. Neither the name of the author nor the names of contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by Craig Metz and + * by other contributors. + * 4. Neither the name of the author nor the names of contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <stdlib.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <sys/ioctl.h> +#include <net/if.h> +#ifdef AF_LINK +#include <net/if_dl.h> +#endif /* AF_LINK */ +#include <errno.h> + +struct if_nameindex *if_nameindex(void) +{ + int i, j, fd; + struct if_nameindex *nameindex = NULL; + struct ifconf ifconf; + void *p; + int len; + char lastname[IFNAMSIZ + 1]; + + if ((fd = socket(PF_INET, SOCK_DGRAM, 0)) < 0) + return NULL; + + if (__siocgifconf(fd, &ifconf)) { + close(fd); + return NULL; + }; + + i = sizeof(struct if_nameindex); + j = 0; + p = ifconf.ifc_buf; + len = ifconf.ifc_len; + lastname[0] = 0; + lastname[IFNAMSIZ] = 0; + + while(len > 0) { + if (len < (IFNAMSIZ + sizeof(struct sockaddr))) + goto ret; + if (strncmp(lastname, p, IFNAMSIZ)) { + memcpy(lastname, p, IFNAMSIZ); + i += sizeof(struct if_nameindex); + j += strlen(lastname) + 1; + }; + len -= IFNAMSIZ; + p += IFNAMSIZ; + + if (len < SA_LEN((struct sockaddr *)p)) + goto ret; + len -= SA_LEN((struct sockaddr *)p); + p += SA_LEN((struct sockaddr *)p); + }; + + if (!(nameindex = malloc(i + j))) { + errno = ENOMEM; + goto ret; + }; + memset(nameindex, 0, i + j); + + { +#ifdef SIOCGIFINDEX + struct ifreq ifreq; +#endif /* SIOCGIFINDEX */ + struct if_nameindex *n; + char *c; + + n = nameindex; + p = ifconf.ifc_buf; + c = (void *)nameindex + i; + i = 0; + len = ifconf.ifc_len; + lastname[0] = 0; + + while(len > 0) { + if (len < (IFNAMSIZ + sizeof(struct sockaddr))) + goto ret; + if (strncmp(lastname, p, IFNAMSIZ)) { + if (i) { + if (!n->if_index) { +#ifdef SIOCGIFINDEX + strcpy(ifreq.ifr_name, lastname); + if (ioctl(fd, SIOCGIFINDEX, &ifreq)) + goto ret; + n->if_index = ifreq.ifr_ifindex; +#else /* SIOCGIFINDEX */ + n->if_index = i; +#endif /* SIOCGIFINDEX */ + }; + n++; + }; + i++; + memcpy(lastname, p, IFNAMSIZ); + strcpy(n->if_name = c, lastname); + c += strlen(c) + 1; + }; + len -= IFNAMSIZ; + p += IFNAMSIZ; + + if (len < SA_LEN((struct sockaddr *)p)) + goto ret; +#ifdef AF_LINK + if (((struct sockaddr *)p)->sa_family == AF_LINK) + n->if_index = ((struct sockaddr_dl *)p)->sdl_index; +#endif /* AF_LINK */ + len -= SA_LEN((struct sockaddr *)p); + p += SA_LEN((struct sockaddr *)p); + }; + + if (!n->if_index) { +#ifdef SIOCGIFINDEX + strcpy(ifreq.ifr_name, lastname); + if (ioctl(fd, SIOCGIFINDEX, &ifreq)) + goto ret; + n->if_index = ifreq.ifr_ifindex; +#else /* SIOCGIFINDEX */ + n->if_index = i; +#endif /* SIOCGIFINDEX */ + }; + }; + +ret: + close(fd); + free(ifconf.ifc_buf); + return nameindex; +}; |