/* * lib/masq_info.c This file contains a the functio masq_info * to print a table of current masquerade connections. * * NET-LIB A collection of functions used from the base set of the * NET-3 Networking Distribution for the LINUX operating * system. (net-tools, net-drivers) * * Version: $Id: masq_info.c,v 1.8 2009/09/06 22:52:01 vapier Exp $ * * Author: Bernd 'eckes' Eckenfels * Copyright 1999 Bernd Eckenfels, Germany * * Modifications: * *960217 {0.01} Bernd Eckenfels: creatin from the code of * Jos Vos' ipfwadm 2.0beta1 *950218 {0.02} Bernd Eckenfels: added * *980405 {0.03} Arnaldo Carvalho: i18n CATGETS -> gettext * * 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. */ #include #include #include #include #include #include #include #include #include #include "net-support.h" #include "pathnames.h" #include "version.h" #include "config.h" #include "intl.h" #include "net-features.h" #if HAVE_FW_MASQUERADE struct masq { unsigned long expires; /* Expiration timer */ char *proto; /* Which protocol are we talking? */ struct sockaddr_in src, dst; /* Source and destination IP addresses */ unsigned short sport, dport; /* Source and destination ports */ unsigned short mport; /* Masqueraded port */ unsigned long initseq; /* Add delta from this seq. on */ short delta; /* Delta in sequence numbers */ short pdelta; /* Delta in sequence numbers before last */ }; static struct aftype *ap; /* current address family */ static int has_pdelta; static void print_masq(struct masq *ms, int numeric_host, int numeric_port, int ext) { unsigned long minutes, seconds, sec100s; printf("%-4s", ms->proto); sec100s = ms->expires % 100L; seconds = (ms->expires / 100L) % 60; minutes = ms->expires / 6000L; printf("%3ld:%02ld.%02ld ", minutes, seconds, sec100s); if (ext > 1) { if (has_pdelta) printf("%10lu %5hd %5hd ", ms->initseq, ms->delta, ms->pdelta); else printf("%10lu %5hd - ", ms->initseq, ms->delta); } printf("%-20s ", ap->sprint((struct sockaddr *) &(ms->src), numeric_host)); printf("%-20s ", ap->sprint((struct sockaddr *) &(ms->dst), numeric_host)); printf("%s -> ", get_sname(ms->sport, ms->proto, numeric_port)); printf("%s", get_sname(ms->dport, ms->proto, numeric_port)); printf(" (%s)\n", get_sname(ms->mport, ms->proto, numeric_port)); } static int read_masqinfo(FILE * f, struct masq *mslist, int nmslist) { int n, nread = 0; struct masq *ms; char buf[256]; for (nread = 0; nread < nmslist; nread++) { ms = &mslist[nread]; if (has_pdelta) { if ((n = fscanf(f, " %s %lX:%hX %lX:%hX %hX %lX %hd %hd %lu", buf, (unsigned long *) &ms->src.sin_addr.s_addr, &ms->sport, (unsigned long *) &ms->dst.sin_addr.s_addr, &ms->dport, &ms->mport, &ms->initseq, &ms->delta, &ms->pdelta, &ms->expires)) == -1) return nread; } else { if ((n = fscanf(f, " %s %lX:%hX %lX:%hX %hX %lX %hd %lu", buf, (unsigned long *) &ms->src.sin_addr.s_addr, &ms->sport, (unsigned long *) &ms->dst.sin_addr.s_addr, &ms->dport, &ms->mport, &ms->initseq, &ms->delta, &ms->expires)) == -1) return nread; } if ((has_pdelta && (n != 10)) || (!has_pdelta && (n != 9))) { EINTERN("masq_info.c", "ip_masquerade format error"); return (-1); } ms->src.sin_family = AF_INET; ms->dst.sin_family = AF_INET; if (strcmp("IP", buf) == 0) ms->proto = "ip"; else if (strcmp("TCP", buf) == 0) ms->proto = "tcp"; else if (strcmp("UDP", buf) == 0) ms->proto = "udp"; else if (strcmp("ICMP", buf) == 0) ms->proto = "icmp"; else if (strcmp("GRE", buf) == 0) ms->proto = "gre"; else if (strcmp("ESP", buf) == 0) ms->proto = "esp"; else { EINTERN("masq_info.c", "ip_masquerade unknown type"); return (-1); } /* we always keep these addresses in network byte order */ ms->src.sin_addr.s_addr = htonl(ms->src.sin_addr.s_addr); ms->dst.sin_addr.s_addr = htonl(ms->dst.sin_addr.s_addr); ms->sport = htons(ms->sport); ms->dport = htons(ms->dport); ms->mport = htons(ms->mport); } return nread; } int ip_masq_info(int numeric_host, int numeric_port, int ext) { FILE *f; int i; char buf[256]; struct masq *mslist; int ntotal = 0, nread; if (!(f = fopen(_PATH_PROCNET_IP_MASQ, "r"))) { if (errno != ENOENT) { perror(_PATH_PROCNET_IP_MASQ); return (-1); } ESYSNOT("netstat", "ip_masquerade"); return (1); } if ((ap = get_aftype("inet")) == NULL) { ENOSUPP("masq_info", "AF INET"); fclose(f); return (-1); } fgets(buf, sizeof(buf), f); has_pdelta = strstr(buf, "PDelta") ? 1 : 0; mslist = (struct masq *) malloc(16 * sizeof(struct masq)); if (!mslist) { EINTERN("masq_info", "malloc() failed"); fclose(f); return (-1); } while ((nread = read_masqinfo(f, &(mslist[ntotal]), 16)) == 16) { ntotal += nread; mslist = (struct masq *) realloc(mslist, (ntotal + 16) * sizeof(struct masq)); if (!mslist) { EINTERN("masq_info", "realloc() failed"); fclose(f); return (-1); } } fclose(f); if (nread < 0) { if (mslist) free(mslist); return (-1); } ntotal += nread; if (ntotal > 0) { printf(_("IP masquerading entries\n")); switch (ext) { case 1: printf(_("prot expire source destination ports\n")); break; default: printf(_("prot expire initseq delta prevd source destination ports\n")); break; } for (i = 0; i < ntotal; i++) print_masq(&(mslist[i]), numeric_host, numeric_port, ext); } free(mslist); return 0; } #endif