/* * ll_map.c * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> * */ #include "libbb.h" #include <string.h> #include "libnetlink.h" #include "ll_map.h" struct idxmap { struct idxmap * next; int index; int type; int alen; unsigned flags; unsigned char addr[8]; char name[16]; }; static struct idxmap *idxmap[16]; int ll_remember_index(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg) { int h; struct ifinfomsg *ifi = NLMSG_DATA(n); struct idxmap *im, **imp; struct rtattr *tb[IFLA_MAX+1]; if (n->nlmsg_type != RTM_NEWLINK) return 0; if (n->nlmsg_len < NLMSG_LENGTH(sizeof(ifi))) return -1; memset(tb, 0, sizeof(tb)); parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), IFLA_PAYLOAD(n)); if (tb[IFLA_IFNAME] == NULL) return 0; h = ifi->ifi_index&0xF; for (imp=&idxmap[h]; (im=*imp)!=NULL; imp = &im->next) if (im->index == ifi->ifi_index) break; if (im == NULL) { im = xmalloc(sizeof(*im)); im->next = *imp; im->index = ifi->ifi_index; *imp = im; } im->type = ifi->ifi_type; im->flags = ifi->ifi_flags; if (tb[IFLA_ADDRESS]) { int alen; im->alen = alen = RTA_PAYLOAD(tb[IFLA_ADDRESS]); if (alen > sizeof(im->addr)) alen = sizeof(im->addr); memcpy(im->addr, RTA_DATA(tb[IFLA_ADDRESS]), alen); } else { im->alen = 0; memset(im->addr, 0, sizeof(im->addr)); } strcpy(im->name, RTA_DATA(tb[IFLA_IFNAME])); return 0; } const char *ll_idx_n2a(int idx, char *buf) { struct idxmap *im; if (idx == 0) return "*"; for (im = idxmap[idx&0xF]; im; im = im->next) if (im->index == idx) return im->name; snprintf(buf, 16, "if%d", idx); return buf; } const char *ll_index_to_name(int idx) { static char nbuf[16]; return ll_idx_n2a(idx, nbuf); } int ll_index_to_type(int idx) { struct idxmap *im; if (idx == 0) return -1; for (im = idxmap[idx&0xF]; im; im = im->next) if (im->index == idx) return im->type; return -1; } unsigned ll_index_to_flags(int idx) { struct idxmap *im; if (idx == 0) return 0; for (im = idxmap[idx&0xF]; im; im = im->next) if (im->index == idx) return im->flags; return 0; } int ll_name_to_index(char *name) { static char ncache[16]; static int icache; struct idxmap *im; int i; if (name == NULL) return 0; if (icache && strcmp(name, ncache) == 0) return icache; for (i=0; i<16; i++) { for (im = idxmap[i]; im; im = im->next) { if (strcmp(im->name, name) == 0) { icache = im->index; strcpy(ncache, name); return im->index; } } } return 0; } int ll_init_map(struct rtnl_handle *rth) { if (rtnl_wilddump_request(rth, AF_UNSPEC, RTM_GETLINK) < 0) { perror("Cannot send dump request"); exit(1); } if (rtnl_dump_filter(rth, ll_remember_index, &idxmap, NULL, NULL) < 0) { fprintf(stderr, "Dump terminated\n"); exit(1); } return 0; }