/***************************************************************** Copyright 1989, 1991, 1992 by Carnegie Mellon University All Rights Reserved Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation, and that the name of CMU not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. CMU DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL CMU BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. ******************************************************************/ /* * Copyright (c) 1983,1988 Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms are permitted * provided that this notice is preserved and that due credit is given * to the University of California at Berkeley. The name of the University * may not be used to endorse or promote products derived from this * software without specific prior written permission. This software * is provided ``as is'' without express or implied warranty. */ #include #if HAVE_STDLIB_H #include #endif #if HAVE_UNISTD_H #include #endif #if HAVE_STRING_H #include #else #include #endif #include #include #if HAVE_SYS_PARAM_H #include #endif #if HAVE_SYS_SELECT_H #include #endif #if HAVE_NETINET_IN_H #include #endif #if HAVE_ARPA_INET_H #include #endif #define LOOPBACKNET 127 #if HAVE_WINSOCK_H #include #include "winstub.h" #endif #if HAVE_SYS_SOCKET_H #include #endif #if HAVE_NETDB_H #include #endif #include "main.h" #include #include "netstat.h" struct route_entry { oid instance[4]; struct in_addr destination; int set_destination; struct in_addr mask; int set_mask; struct in_addr gateway; int set_gateway; int ifNumber; int set_ifNumber; int type; int set_type; int proto; int set_proto; char ifname[64]; int set_name; }; #define RTDEST 1 #define RTIFINDEX 2 #define RTNEXTHOP 7 #define RTTYPE 8 #define RTPROTO 9 #define RTMASK 11 static oid oid_rttable[] = { 1, 3, 6, 1, 2, 1, 4, 21, 1 }; static oid oid_rtdest[] = { 1, 3, 6, 1, 2, 1, 4, 21, 1, 1 }; static oid oid_rtifindex[] = { 1, 3, 6, 1, 2, 1, 4, 21, 1, 2 }; static oid oid_rtnexthop[] = { 1, 3, 6, 1, 2, 1, 4, 21, 1, 7 }; static oid oid_rttype[] = { 1, 3, 6, 1, 2, 1, 4, 21, 1, 8 }; static oid oid_rtproto[] = { 1, 3, 6, 1, 2, 1, 4, 21, 1, 9 }; static oid oid_rtmask[] = { 1, 3, 6, 1, 2, 1, 4, 21, 1, 11 }; static oid oid_ifdescr[] = { 1, 3, 6, 1, 2, 1, 2, 2, 1, 2 }; static oid oid_ipnoroutes[] = { 1, 3, 6, 1, 2, 1, 4, 12, 0 }; /* * Print routing tables. */ void routepr(void) { struct route_entry route, *rp = &route; netsnmp_pdu *request, *response; netsnmp_variable_list *vp; char name[16], *flags; oid *instance, type; int toloopback, status; char ch; printf("Routing tables\n"); printf("%-26.26s %-18.18s %-6.6s %s\n", "Destination", "Gateway", "Flags", "Interface"); request = snmp_pdu_create(SNMP_MSG_GETNEXT); snmp_add_null_var(request, oid_rtdest, sizeof(oid_rtdest) / sizeof(oid)); snmp_add_null_var(request, oid_rtmask, sizeof(oid_rtmask) / sizeof(oid)); snmp_add_null_var(request, oid_rtifindex, sizeof(oid_rtifindex) / sizeof(oid)); snmp_add_null_var(request, oid_rtnexthop, sizeof(oid_rtnexthop) / sizeof(oid)); snmp_add_null_var(request, oid_rttype, sizeof(oid_rttype) / sizeof(oid)); snmp_add_null_var(request, oid_rtproto, sizeof(oid_rtproto) / sizeof(oid)); while (request) { status = snmp_synch_response(Session, request, &response); if (status != STAT_SUCCESS || response->errstat != SNMP_ERR_NOERROR) { fprintf(stderr, "SNMP request failed\n"); break; } instance = NULL; request = NULL; rp->set_destination = 0; rp->set_mask = 0; rp->set_ifNumber = 0; rp->set_gateway = 0; rp->set_type = 0; rp->set_proto = 0; for (vp = response->variables; vp; vp = vp->next_variable) { if (vp->name_length != 14 || memcmp(vp->name, oid_rttable, sizeof(oid_rttable))) { continue; /* if it isn't in this subtree, just continue */ } if (instance != NULL) { oid *ip, *op; int count; ip = instance; op = vp->name + 10; for (count = 0; count < 4; count++) { if (*ip++ != *op++) break; } if (count < 4) continue; /* not the right instance, ignore */ } else { instance = vp->name + 10; } /* * At this point, this variable is known to be in the routing table * subtree, and is of the right instance for this transaction. */ if (request == NULL) request = snmp_pdu_create(SNMP_MSG_GETNEXT); snmp_add_null_var(request, vp->name, vp->name_length); type = vp->name[9]; switch ((char) type) { case RTDEST: memmove(&rp->destination, vp->val.string, sizeof(u_long)); rp->set_destination = 1; break; case RTMASK: memmove(&rp->mask, vp->val.string, sizeof(u_long)); rp->set_mask = 1; break; case RTIFINDEX: rp->ifNumber = *vp->val.integer; rp->set_ifNumber = 1; break; case RTNEXTHOP: memmove(&rp->gateway, vp->val.string, sizeof(u_long)); rp->set_gateway = 1; break; case RTTYPE: rp->type = *vp->val.integer; rp->set_type = 1; break; case RTPROTO: rp->proto = *vp->val.integer; rp->set_proto = 1; break; } } snmp_free_pdu(response); if (!(rp->set_destination && rp->set_gateway && rp->set_type && rp->set_ifNumber)) { if (request) snmp_free_pdu(request); request = NULL; continue; } toloopback = *(char *) &rp->gateway == LOOPBACKNET; printf("%-26.26s ", (rp->destination.s_addr == INADDR_ANY) ? "default" : (toloopback) ? routename(rp->destination) : rp->set_mask ? netname(rp->destination, rp->mask.s_addr) : netname(rp->destination, 0L)); printf("%-18.18s ", routename(rp->gateway)); flags = name; *flags++ = 'U'; /* route is in use */ /* * this !toloopback shouldnt be necessary */ if (!toloopback && rp->type == MIB_IPROUTETYPE_REMOTE) *flags++ = 'G'; if (toloopback) *flags++ = 'H'; if (rp->proto == MIB_IPROUTEPROTO_ICMP) *flags++ = 'D'; /* redirect */ *flags = '\0'; printf("%-6.6s ", name); get_ifname(rp->ifname, rp->ifNumber); ch = rp->ifname[strlen(rp->ifname) - 1]; ch = '5'; /* force the if statement */ if (isdigit(ch)) printf(" %.32s\n", rp->ifname); else printf(" %.32s%d\n", rp->ifname, rp->ifNumber); } } struct iflist { int index; char name[64]; struct iflist *next; } *Iflist = NULL; void get_ifname(char *name, int ifIndex) { netsnmp_pdu *pdu, *response; netsnmp_variable_list *vp; struct iflist *ip; oid varname[MAX_OID_LEN]; int status; for (ip = Iflist; ip; ip = ip->next) { if (ip->index == ifIndex) break; } if (ip) { strcpy(name, ip->name); return; } ip = (struct iflist *) malloc(sizeof(struct iflist)); if (ip == NULL) return; ip->next = Iflist; Iflist = ip; ip->index = ifIndex; pdu = snmp_pdu_create(SNMP_MSG_GET); memmove(varname, oid_ifdescr, sizeof(oid_ifdescr)); varname[10] = (oid) ifIndex; snmp_add_null_var(pdu, varname, sizeof(oid_ifdescr) / sizeof(oid) + 1); status = snmp_synch_response(Session, pdu, &response); if (status == STAT_SUCCESS && response->errstat == SNMP_ERR_NOERROR) { vp = response->variables; if (vp->val_len >= sizeof(ip->name)) vp->val_len = sizeof(ip->name) - 1; memmove(ip->name, vp->val.string, vp->val_len); ip->name[vp->val_len] = '\0'; snmp_free_pdu(response); } else { sprintf(ip->name, "if%d", ifIndex); } strcpy(name, ip->name); } static u_long forgemask(u_long a) { u_long m; if (IN_CLASSA(a)) m = IN_CLASSA_NET; else if (IN_CLASSB(a)) m = IN_CLASSB_NET; else m = IN_CLASSC_NET; return m; } static void domask(char *dst, u_long addr, u_long mask) { int b, i; if (!mask || forgemask(addr) == mask) { *dst = '\0'; return; } i = 0; for (b = 0; b < 32; b++) if (mask & (1 << b)) { int bb; i = b; for (bb = b + 1; bb < 32; bb++) if (!(mask & (1 << bb))) { i = -1; /* non-contig */ break; } break; } if (i == -1) sprintf(dst, "&0x%lx", mask); else sprintf(dst, "/%d", 32 - i); } char * routename(struct in_addr in) { register char *cp; static char line[MAXHOSTNAMELEN + 1]; struct hostent *hp; static char domain[MAXHOSTNAMELEN + 1]; static int first = 1; if (first) { first = 0; if (gethostname(domain, MAXHOSTNAMELEN) == 0 && (cp = (char *) strchr(domain, '.'))) (void) strcpy(domain, cp + 1); else domain[0] = 0; } cp = 0; if (!nflag) { hp = gethostbyaddr((char *) &in, sizeof(struct in_addr), AF_INET); if (hp) { if ((cp = (char *) strchr(hp->h_name, '.')) && !strcmp(cp + 1, domain)) *cp = 0; cp = (char *) hp->h_name; } } if (cp) strncpy(line, cp, sizeof(line) - 1); else { #define C(x) (unsigned)((x) & 0xff) in.s_addr = ntohl(in.s_addr); sprintf(line, "%u.%u.%u.%u", C(in.s_addr >> 24), C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr)); } return (line); } /* * Return the name of the network whose address is given. * The address is assumed to be that of a net or subnet, not a host. */ char * netname(struct in_addr in, u_long mask) { char *cp = NULL; static char line[MAXHOSTNAMELEN + 1]; struct netent *np = 0; u_long net, omask; u_long i; int subnetshift; i = ntohl(in.s_addr); omask = mask = ntohl(mask); if (!nflag && i != INADDR_ANY) { if (mask == INADDR_ANY) { if (IN_CLASSA(i)) { mask = IN_CLASSA_NET; subnetshift = 8; } else if (IN_CLASSB(i)) { mask = IN_CLASSB_NET; subnetshift = 8; } else { mask = IN_CLASSC_NET; subnetshift = 4; } /* * If there are more bits than the standard mask * would suggest, subnets must be in use. * Guess at the subnet mask, assuming reasonable * width subnet fields. */ while (i & ~mask) mask = (long) mask >> subnetshift; } net = i & mask; while ((mask & 1) == 0) mask >>= 1, net >>= 1; np = getnetbyaddr(net, AF_INET); if (np) cp = np->n_name; } if (cp) strncpy(line, cp, sizeof(line) - 1); else if ((i & 0xffffff) == 0) sprintf(line, "%u", C(i >> 24)); else if ((i & 0xffff) == 0) sprintf(line, "%u.%u", C(i >> 24), C(i >> 16)); else if ((i & 0xff) == 0) sprintf(line, "%u.%u.%u", C(i >> 24), C(i >> 16), C(i >> 8)); else sprintf(line, "%u.%u.%u.%u", C(i >> 24), C(i >> 16), C(i >> 8), C(i)); domask(line + strlen(line), i, omask); return (line); } /* * Print routing statistics */ void rt_stats(void) { netsnmp_variable_list *var; printf("routing:\n"); var = getvarbyname(Session, oid_ipnoroutes, sizeof(oid_ipnoroutes) / sizeof(oid)); if (var) { printf("\t%lu destination%s found unreachable\n", *var->val.integer, plural((int) *var->val.integer)); snmp_free_var(var); } else { printf("\tCouldn't get ipOutNoRoutes variable\n"); } } /* * Request a variable with a GET REQUEST message on the given * session. If the variable is found, a * pointer to a netsnmp_variable_list object will be returned. * Otherwise, NULL is returned. The caller must free the returned * variable_list object when done with it. */ netsnmp_variable_list * getvarbyname(netsnmp_session * sp, oid * name, size_t len) { netsnmp_pdu *request, *response; netsnmp_variable_list *var = NULL, *vp; int status; request = snmp_pdu_create(SNMP_MSG_GET); snmp_add_null_var(request, name, len); status = snmp_synch_response(sp, request, &response); if (status == STAT_SUCCESS) { if (response->errstat == SNMP_ERR_NOERROR) { for (var = response->variables; var; var = var->next_variable) { if (var->name_length == len && !memcmp(name, var->name, len * sizeof(oid))) break; /* found our match */ } if (var != NULL) { /* * Now unlink this var from pdu chain so it doesn't get freed. * The caller will free the var. */ if (response->variables == var) { response->variables = var->next_variable; } else { for (vp = response->variables; vp; vp = vp->next_variable) { if (vp->next_variable == var) { vp->next_variable = var->next_variable; break; } } } if (var->type == SNMP_NOSUCHOBJECT || var->type == SNMP_NOSUCHINSTANCE || var->type == SNMP_ENDOFMIBVIEW) { snmp_free_var(var); var = NULL; } } } } else if (status != STAT_TIMEOUT) snmp_sess_perror("snmpnetstat", sp); if (response) snmp_free_pdu(response); return var; }