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1083 lines
36 KiB
1083 lines
36 KiB
/*
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* pcap-sita.c: Packet capture interface additions for SITA ACN devices
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*
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* Copyright (c) 2007 Fulko Hew, SITA INC Canada, Inc <fulko.hew@sita.aero>
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*
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* License: BSD
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. The names of the authors may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include "pcap-int.h"
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#include "pcap-sita.h"
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/* non-configureable manifests follow */
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#define IOP_SNIFFER_PORT 49152 /* TCP port on the IOP used for 'distributed pcap' usage */
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#define MAX_LINE_SIZE 255 /* max size of a buffer/line in /etc/hosts we allow */
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#define MAX_CHASSIS 8 /* number of chassis in an ACN site */
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#define MAX_GEOSLOT 8 /* max number of access units in an ACN site */
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#define FIND 0
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#define LIVE 1
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typedef struct iface {
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struct iface *next; /* a pointer to the next interface */
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char *name; /* this interface's name */
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char *IOPname; /* this interface's name on an IOP */
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uint32_t iftype; /* the type of interface (DLT values) */
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} iface_t;
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typedef struct unit {
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char *ip; /* this unit's IP address (as extracted from /etc/hosts) */
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int fd; /* the connection to this unit (if it exists) */
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int find_fd; /* a big kludge to avoid my programming limitations since I could have this unit open for findalldevs purposes */
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int first_time; /* 0 = just opened via acn_open_live(), ie. the first time, NZ = nth time */
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struct sockaddr_in *serv_addr; /* the address control block for comms to this unit */
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int chassis;
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int geoslot;
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iface_t *iface; /* a pointer to a linked list of interface structures */
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char *imsg; /* a pointer to an inbound message */
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int len; /* the current size of the inbound message */
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} unit_t;
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/*
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* Private data.
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* Currently contains nothing.
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*/
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struct pcap_sita {
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int dummy;
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};
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static unit_t units[MAX_CHASSIS+1][MAX_GEOSLOT+1]; /* we use indexes of 1 through 8, but we reserve/waste index 0 */
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static fd_set readfds; /* a place to store the file descriptors for the connections to the IOPs */
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static int max_fs;
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pcap_if_t *acn_if_list; /* pcap's list of available interfaces */
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static void dump_interface_list(void) {
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pcap_if_t *iff;
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pcap_addr_t *addr;
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int longest_name_len = 0;
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char *n, *d, *f;
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int if_number = 0;
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iff = acn_if_list;
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while (iff) {
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if (iff->name && (strlen(iff->name) > longest_name_len)) longest_name_len = strlen(iff->name);
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iff = iff->next;
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}
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iff = acn_if_list;
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printf("Interface List:\n");
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while (iff) {
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n = (iff->name) ? iff->name : "";
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d = (iff->description) ? iff->description : "";
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f = (iff->flags == PCAP_IF_LOOPBACK) ? "L" : "";
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printf("%3d: %*s %s '%s'\n", if_number++, longest_name_len, n, f, d);
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addr = iff->addresses;
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while (addr) {
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printf("%*s ", (5 + longest_name_len), ""); /* add some indentation */
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printf("%15s ", (addr->addr) ? inet_ntoa(((struct sockaddr_in *)addr->addr)->sin_addr) : "");
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printf("%15s ", (addr->netmask) ? inet_ntoa(((struct sockaddr_in *)addr->netmask)->sin_addr) : "");
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printf("%15s ", (addr->broadaddr) ? inet_ntoa(((struct sockaddr_in *)addr->broadaddr)->sin_addr) : "");
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printf("%15s ", (addr->dstaddr) ? inet_ntoa(((struct sockaddr_in *)addr->dstaddr)->sin_addr) : "");
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printf("\n");
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addr = addr->next;
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}
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iff = iff->next;
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}
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}
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static void dump(unsigned char *ptr, int i, int indent) {
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fprintf(stderr, "%*s", indent, " ");
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for (; i > 0; i--) {
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fprintf(stderr, "%2.2x ", *ptr++);
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}
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fprintf(stderr, "\n");
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}
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static void dump_interface_list_p(void) {
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pcap_if_t *iff;
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pcap_addr_t *addr;
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int if_number = 0;
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iff = acn_if_list;
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printf("Interface Pointer @ %p is %p:\n", &acn_if_list, iff);
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while (iff) {
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printf("%3d: %p %p next: %p\n", if_number++, iff->name, iff->description, iff->next);
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dump((unsigned char *)iff, sizeof(pcap_if_t), 5);
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addr = iff->addresses;
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while (addr) {
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printf(" %p %p %p %p, next: %p\n", addr->addr, addr->netmask, addr->broadaddr, addr->dstaddr, addr->next);
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dump((unsigned char *)addr, sizeof(pcap_addr_t), 10);
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addr = addr->next;
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}
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iff = iff->next;
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}
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}
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static void dump_unit_table(void) {
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int chassis, geoslot;
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iface_t *p;
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printf("%c:%c %s %s\n", 'C', 'S', "fd", "IP Address");
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for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) {
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for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) {
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if (units[chassis][geoslot].ip != NULL)
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printf("%d:%d %2d %s\n", chassis, geoslot, units[chassis][geoslot].fd, units[chassis][geoslot].ip);
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p = units[chassis][geoslot].iface;
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while (p) {
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char *n = (p->name) ? p->name : "";
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char *i = (p->IOPname) ? p->IOPname : "";
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p = p->next;
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printf(" %12s -> %12s\n", i, n);
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}
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}
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}
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}
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static int find_unit_by_fd(int fd, int *chassis, int *geoslot, unit_t **unit_ptr) {
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int c, s;
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for (c = 0; c <= MAX_CHASSIS; c++) {
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for (s = 0; s <= MAX_GEOSLOT; s++) {
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if (units[c][s].fd == fd || units[c][s].find_fd == fd) {
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if (chassis) *chassis = c;
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if (geoslot) *geoslot = s;
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if (unit_ptr) *unit_ptr = &units[c][s];
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return 1;
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}
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}
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}
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return 0;
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}
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static int read_client_nbytes(int fd, int count, unsigned char *buf) {
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unit_t *u;
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int chassis, geoslot;
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int len;
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find_unit_by_fd(fd, &chassis, &geoslot, &u);
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while (count) {
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if ((len = recv(fd, buf, count, 0)) <= 0) return -1; /* read in whatever data was sent to us */
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count -= len;
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buf += len;
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} /* till we have everything we are looking for */
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return 0;
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}
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static void empty_unit_iface(unit_t *u) {
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iface_t *p, *cur;
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cur = u->iface;
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while (cur) { /* loop over all the interface entries */
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if (cur->name) free(cur->name); /* throwing away the contents if they exist */
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if (cur->IOPname) free(cur->IOPname);
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p = cur->next;
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free(cur); /* then throw away the structure itself */
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cur = p;
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}
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u->iface = 0; /* and finally remember that there are no remaining structure */
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}
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static void empty_unit(int chassis, int geoslot) {
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unit_t *u = &units[chassis][geoslot];
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empty_unit_iface(u);
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if (u->imsg) { /* then if an inbound message buffer exists */
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void *bigger_buffer;
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bigger_buffer = (char *)realloc(u->imsg, 1); /* and re-allocate the old large buffer into a new small one */
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if (bigger_buffer == NULL) { /* oops, realloc call failed */
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fprintf(stderr, "Warning...call to realloc() failed, value of errno is %d\n", errno);
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return;
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}
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u->imsg = bigger_buffer;
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}
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}
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static void empty_unit_table(void) {
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int chassis, geoslot;
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for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) {
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for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) {
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if (units[chassis][geoslot].ip != NULL) {
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free(units[chassis][geoslot].ip); /* get rid of the malloc'ed space that holds the IP address */
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units[chassis][geoslot].ip = 0; /* then set the pointer to NULL */
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}
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empty_unit(chassis, geoslot);
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}
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}
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}
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static char *find_nth_interface_name(int n) {
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int chassis, geoslot;
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iface_t *p;
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char *last_name = 0;
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if (n < 0) n = 0; /* ensure we are working with a valid number */
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for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { /* scan the table... */
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for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) {
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if (units[chassis][geoslot].ip != NULL) {
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p = units[chassis][geoslot].iface;
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while (p) { /* and all interfaces... */
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if (p->IOPname) last_name = p->name; /* remembering the last name found */
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if (n-- == 0) return last_name; /* and if we hit the instance requested */
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p = p->next;
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}
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}
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}
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}
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/* if we couldn't fine the selected entry */
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if (last_name) return last_name; /* ... but we did have at least one entry... return the last entry found */
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return ""; /* ... but if there wasn't any entry... return an empty string instead */
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}
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int acn_parse_hosts_file(char *errbuf) { /* returns: -1 = error, 0 = OK */
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FILE *fp;
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char buf[MAX_LINE_SIZE];
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char *ptr, *ptr2;
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int pos;
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int chassis, geoslot;
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unit_t *u;
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empty_unit_table();
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if ((fp = fopen("/etc/hosts", "r")) == NULL) { /* try to open the hosts file and if it fails */
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snprintf(errbuf, PCAP_ERRBUF_SIZE, "Cannot open '/etc/hosts' for reading."); /* return the nohostsfile error response */
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return -1;
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}
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while (fgets(buf, MAX_LINE_SIZE-1, fp)) { /* while looping over the file */
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pos = strcspn(buf, "#\n\r"); /* find the first comment character or EOL */
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*(buf + pos) = '\0'; /* and clobber it and anything that follows it */
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pos = strspn(buf, " \t"); /* then find the first non-white space */
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if (pos == strlen(buf)) /* if there is nothing but white space on the line */
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continue; /* ignore that empty line */
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ptr = buf + pos; /* and skip over any of that leading whitespace */
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if ((ptr2 = strstr(ptr, "_I_")) == NULL) /* skip any lines that don't have names that look like they belong to IOPs */
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continue;
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if (*(ptr2 + 4) != '_') /* and skip other lines that have names that don't look like ACN components */
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continue;
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*(ptr + strcspn(ptr, " \t")) = '\0'; /* null terminate the IP address so its a standalone string */
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chassis = *(ptr2 + 3) - '0'; /* extract the chassis number */
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geoslot = *(ptr2 + 5) - '0'; /* and geo-slot number */
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if (chassis < 1 || chassis > MAX_CHASSIS ||
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geoslot < 1 || geoslot > MAX_GEOSLOT) { /* if the chassis and/or slot numbers appear to be bad... */
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snprintf(errbuf, PCAP_ERRBUF_SIZE, "Invalid ACN name in '/etc/hosts'."); /* warn the user */
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continue; /* and ignore the entry */
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}
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ptr2 = strdup(ptr); /* copy the IP address into our malloc'ed memory */
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if (ptr2 == NULL) {
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pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
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errno, "malloc");
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continue;
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}
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u = &units[chassis][geoslot];
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u->ip = ptr2; /* and remember the whole shebang */
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u->chassis = chassis;
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u->geoslot = geoslot;
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}
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fclose(fp);
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if (*errbuf) return -1;
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else return 0;
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}
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static int open_with_IOP(unit_t *u, int flag) {
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int sockfd;
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char *ip;
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if (u->serv_addr == NULL) {
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u->serv_addr = malloc(sizeof(struct sockaddr_in));
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/* since we called malloc(), lets check to see if we actually got the memory */
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if (u->serv_addr == NULL) { /* oops, we didn't get the memory requested */
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fprintf(stderr, "malloc() request for u->serv_addr failed, value of errno is: %d\n", errno);
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return 0;
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}
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}
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ip = u->ip;
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/* bzero() is deprecated, replaced with memset() */
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memset((char *)u->serv_addr, 0, sizeof(struct sockaddr_in));
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u->serv_addr->sin_family = AF_INET;
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u->serv_addr->sin_addr.s_addr = inet_addr(ip);
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u->serv_addr->sin_port = htons(IOP_SNIFFER_PORT);
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if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
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fprintf(stderr, "pcap can't open a socket for connecting to IOP at %s\n", ip);
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return 0;
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}
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if (connect(sockfd, (struct sockaddr *)u->serv_addr, sizeof(struct sockaddr_in)) < 0) {
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fprintf(stderr, "pcap can't connect to IOP at %s\n", ip);
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return 0;
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}
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if (flag == LIVE) u->fd = sockfd;
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else u->find_fd = sockfd;
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u->first_time = 0;
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return sockfd; /* return the non-zero file descriptor as a 'success' indicator */
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}
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static void close_with_IOP(int chassis, int geoslot, int flag) {
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int *id;
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if (flag == LIVE) id = &units[chassis][geoslot].fd;
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else id = &units[chassis][geoslot].find_fd;
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if (*id) { /* this was the last time, so... if we are connected... */
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close(*id); /* disconnect us */
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*id = 0; /* and forget that the descriptor exists because we are not open */
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}
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}
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static void pcap_cleanup_acn(pcap_t *handle) {
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int chassis, geoslot;
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unit_t *u;
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if (find_unit_by_fd(handle->fd, &chassis, &geoslot, &u) == 0)
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return;
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close_with_IOP(chassis, geoslot, LIVE);
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if (u)
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u->first_time = 0;
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pcap_cleanup_live_common(handle);
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}
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static void send_to_fd(int fd, int len, unsigned char *str) {
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int nwritten;
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int chassis, geoslot;
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while (len > 0) {
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if ((nwritten = write(fd, str, len)) <= 0) {
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find_unit_by_fd(fd, &chassis, &geoslot, NULL);
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if (units[chassis][geoslot].fd == fd) close_with_IOP(chassis, geoslot, LIVE);
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else if (units[chassis][geoslot].find_fd == fd) close_with_IOP(chassis, geoslot, FIND);
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empty_unit(chassis, geoslot);
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return;
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}
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len -= nwritten;
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str += nwritten;
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}
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}
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static void acn_freealldevs(void) {
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pcap_if_t *iff, *next_iff;
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pcap_addr_t *addr, *next_addr;
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for (iff = acn_if_list; iff != NULL; iff = next_iff) {
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next_iff = iff->next;
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for (addr = iff->addresses; addr != NULL; addr = next_addr) {
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next_addr = addr->next;
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if (addr->addr) free(addr->addr);
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if (addr->netmask) free(addr->netmask);
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if (addr->broadaddr) free(addr->broadaddr);
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if (addr->dstaddr) free(addr->dstaddr);
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free(addr);
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}
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if (iff->name) free(iff->name);
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if (iff->description) free(iff->description);
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free(iff);
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}
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}
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static void nonUnified_IOP_port_name(char *buf, size_t bufsize, const char *proto, unit_t *u) {
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snprintf(buf, bufsize, "%s_%d_%d", proto, u->chassis, u->geoslot);
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}
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static void unified_IOP_port_name(char *buf, size_t bufsize, const char *proto, unit_t *u, int IOPportnum) {
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int portnum;
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portnum = ((u->chassis - 1) * 64) + ((u->geoslot - 1) * 8) + IOPportnum + 1;
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snprintf(buf, bufsize, "%s_%d", proto, portnum);
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}
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static char *translate_IOP_to_pcap_name(unit_t *u, char *IOPname, bpf_u_int32 iftype) {
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iface_t *iface_ptr, *iface;
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char buf[32];
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char *proto;
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char *port;
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int IOPportnum = 0;
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iface = malloc(sizeof(iface_t)); /* get memory for a structure */
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if (iface == NULL) { /* oops, we didn't get the memory requested */
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fprintf(stderr, "Error...couldn't allocate memory for interface structure...value of errno is: %d\n", errno);
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return NULL;
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}
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memset((char *)iface, 0, sizeof(iface_t)); /* bzero is deprecated(), replaced with memset() */
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iface->iftype = iftype; /* remember the interface type of this interface */
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|
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iface->IOPname = strdup(IOPnam); /* copy it and stick it into the structure */
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if (iface->IOPname == NULL) { /* oops, we didn't get the memory requested */
|
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fprintf(stderr, "Error...couldn't allocate memory for IOPname...value of errno is: %d\n", errno);
|
|
return NULL;
|
|
}
|
|
|
|
if (strncmp(IOPname, "lo", 2) == 0) {
|
|
IOPportnum = atoi(&IOPname[2]);
|
|
switch (iftype) {
|
|
case DLT_EN10MB:
|
|
nonUnified_IOP_port_name(buf, sizeof buf, "lo", u);
|
|
break;
|
|
default:
|
|
unified_IOP_port_name(buf, sizeof buf, "???", u, IOPportnum);
|
|
break;
|
|
}
|
|
} else if (strncmp(IOPname, "eth", 3) == 0) {
|
|
IOPportnum = atoi(&IOPname[3]);
|
|
switch (iftype) {
|
|
case DLT_EN10MB:
|
|
nonUnified_IOP_port_name(buf, sizeof buf, "eth", u);
|
|
break;
|
|
default:
|
|
unified_IOP_port_name(buf, sizeof buf, "???", u, IOPportnum);
|
|
break;
|
|
}
|
|
} else if (strncmp(IOPname, "wan", 3) == 0) {
|
|
IOPportnum = atoi(&IOPname[3]);
|
|
switch (iftype) {
|
|
case DLT_SITA:
|
|
unified_IOP_port_name(buf, sizeof buf, "wan", u, IOPportnum);
|
|
break;
|
|
default:
|
|
unified_IOP_port_name(buf, sizeof buf, "???", u, IOPportnum);
|
|
break;
|
|
}
|
|
} else {
|
|
fprintf(stderr, "Error... invalid IOP name %s\n", IOPname);
|
|
return NULL;
|
|
}
|
|
|
|
iface->name = strdup(buf); /* make a copy and stick it into the structure */
|
|
if (iface->name == NULL) { /* oops, we didn't get the memory requested */
|
|
fprintf(stderr, "Error...couldn't allocate memory for IOP port name...value of errno is: %d\n", errno);
|
|
return NULL;
|
|
}
|
|
|
|
if (u->iface == 0) { /* if this is the first name */
|
|
u->iface = iface; /* stick this entry at the head of the list */
|
|
} else {
|
|
iface_ptr = u->iface;
|
|
while (iface_ptr->next) { /* othewise scan the list */
|
|
iface_ptr = iface_ptr->next; /* till we're at the last entry */
|
|
}
|
|
iface_ptr->next = iface; /* then tack this entry on the end of the list */
|
|
}
|
|
return iface->name;
|
|
}
|
|
|
|
static int if_sort(char *s1, char *s2) {
|
|
char *s1_p2, *s2_p2;
|
|
char str1[MAX_LINE_SIZE], str2[MAX_LINE_SIZE];
|
|
int s1_p1_len, s2_p1_len;
|
|
int retval;
|
|
|
|
if ((s1_p2 = strchr(s1, '_'))) { /* if an underscore is found... */
|
|
s1_p1_len = s1_p2 - s1; /* the prefix length is the difference in pointers */
|
|
s1_p2++; /* the suffix actually starts _after_ the underscore */
|
|
} else { /* otherwise... */
|
|
s1_p1_len = strlen(s1); /* the prefix length is the length of the string itself */
|
|
s1_p2 = 0; /* and there is no suffix */
|
|
}
|
|
if ((s2_p2 = strchr(s2, '_'))) { /* now do the same for the second string */
|
|
s2_p1_len = s2_p2 - s2;
|
|
s2_p2++;
|
|
} else {
|
|
s2_p1_len = strlen(s2);
|
|
s2_p2 = 0;
|
|
}
|
|
strncpy(str1, s1, (s1_p1_len > sizeof(str1)) ? s1_p1_len : sizeof(str1)); *(str1 + s1_p1_len) = 0;
|
|
strncpy(str2, s2, (s2_p1_len > sizeof(str2)) ? s2_p1_len : sizeof(str2)); *(str2 + s2_p1_len) = 0;
|
|
retval = strcmp(str1, str2);
|
|
if (retval != 0) return retval; /* if they are not identical, then we can quit now and return the indication */
|
|
return strcmp(s1_p2, s2_p2); /* otherwise we return the result of comparing the 2nd half of the string */
|
|
}
|
|
|
|
static void sort_if_table(void) {
|
|
pcap_if_t *p1, *p2, *prev, *temp;
|
|
int has_swapped;
|
|
|
|
if (!acn_if_list) return; /* nothing to do if the list is empty */
|
|
|
|
while (1) {
|
|
p1 = acn_if_list; /* start at the head of the list */
|
|
prev = 0;
|
|
has_swapped = 0;
|
|
while ((p2 = p1->next)) {
|
|
if (if_sort(p1->name, p2->name) > 0) {
|
|
if (prev) { /* we are swapping things that are _not_ at the head of the list */
|
|
temp = p2->next;
|
|
prev->next = p2;
|
|
p2->next = p1;
|
|
p1->next = temp;
|
|
} else { /* special treatment if we are swapping with the head of the list */
|
|
temp = p2->next;
|
|
acn_if_list= p2;
|
|
p2->next = p1;
|
|
p1->next = temp;
|
|
}
|
|
p1 = p2;
|
|
prev = p1;
|
|
has_swapped = 1;
|
|
}
|
|
prev = p1;
|
|
p1 = p1->next;
|
|
}
|
|
if (has_swapped == 0)
|
|
return;
|
|
}
|
|
return;
|
|
}
|
|
|
|
static int process_client_data (char *errbuf) { /* returns: -1 = error, 0 = OK */
|
|
int chassis, geoslot;
|
|
unit_t *u;
|
|
pcap_if_t *iff, *prev_iff;
|
|
pcap_addr_t *addr, *prev_addr;
|
|
char *ptr;
|
|
int address_count;
|
|
struct sockaddr_in *s;
|
|
char *newname;
|
|
bpf_u_int32 interfaceType;
|
|
unsigned char flags;
|
|
void *bigger_buffer;
|
|
|
|
prev_iff = 0;
|
|
for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) {
|
|
for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) { /* now loop over all the devices */
|
|
u = &units[chassis][geoslot];
|
|
empty_unit_iface(u);
|
|
ptr = u->imsg; /* point to the start of the msg for this IOP */
|
|
while (ptr < (u->imsg + u->len)) {
|
|
if ((iff = malloc(sizeof(pcap_if_t))) == NULL) {
|
|
pcap_fmt_errmsg_for_errno(errbuf,
|
|
PCAP_ERRBUF_SIZE, errno, "malloc");
|
|
return -1;
|
|
}
|
|
memset((char *)iff, 0, sizeof(pcap_if_t)); /* bzero() is deprecated, replaced with memset() */
|
|
if (acn_if_list == 0) acn_if_list = iff; /* remember the head of the list */
|
|
if (prev_iff) prev_iff->next = iff; /* insert a forward link */
|
|
|
|
if (*ptr) { /* if there is a count for the name */
|
|
if ((iff->name = malloc(*ptr + 1)) == NULL) { /* get that amount of space */
|
|
pcap_fmt_errmsg_for_errno(errbuf,
|
|
PCAP_ERRBUF_SIZE, errno,
|
|
"malloc");
|
|
return -1;
|
|
}
|
|
memcpy(iff->name, (ptr + 1), *ptr); /* copy the name into the malloc'ed space */
|
|
*(iff->name + *ptr) = 0; /* and null terminate the string */
|
|
ptr += *ptr; /* now move the pointer forwards by the length of the count plus the length of the string */
|
|
}
|
|
ptr++;
|
|
|
|
if (*ptr) { /* if there is a count for the description */
|
|
if ((iff->description = malloc(*ptr + 1)) == NULL) { /* get that amount of space */
|
|
pcap_fmt_errmsg_for_errno(errbuf,
|
|
PCAP_ERRBUF_SIZE, errno,
|
|
"malloc");
|
|
return -1;
|
|
}
|
|
memcpy(iff->description, (ptr + 1), *ptr); /* copy the name into the malloc'ed space */
|
|
*(iff->description + *ptr) = 0; /* and null terminate the string */
|
|
ptr += *ptr; /* now move the pointer forwards by the length of the count plus the length of the string */
|
|
}
|
|
ptr++;
|
|
|
|
interfaceType = ntohl(*(bpf_u_int32 *)ptr);
|
|
ptr += 4; /* skip over the interface type */
|
|
|
|
flags = *ptr++;
|
|
if (flags) iff->flags = PCAP_IF_LOOPBACK; /* if this is a loopback style interface, lets mark it as such */
|
|
|
|
address_count = *ptr++;
|
|
|
|
prev_addr = 0;
|
|
while (address_count--) {
|
|
if ((addr = malloc(sizeof(pcap_addr_t))) == NULL) {
|
|
pcap_fmt_errmsg_for_errno(errbuf,
|
|
PCAP_ERRBUF_SIZE, errno,
|
|
"malloc");
|
|
return -1;
|
|
}
|
|
memset((char *)addr, 0, sizeof(pcap_addr_t)); /* bzero() is deprecated, replaced with memset() */
|
|
if (iff->addresses == 0) iff->addresses = addr;
|
|
if (prev_addr) prev_addr->next = addr; /* insert a forward link */
|
|
if (*ptr) { /* if there is a count for the address */
|
|
if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) { /* get that amount of space */
|
|
pcap_fmt_errmsg_for_errno(errbuf,
|
|
PCAP_ERRBUF_SIZE,
|
|
errno, "malloc");
|
|
return -1;
|
|
}
|
|
memset((char *)s, 0, sizeof(struct sockaddr_in)); /* bzero() is deprecated, replaced with memset() */
|
|
addr->addr = (struct sockaddr *)s;
|
|
s->sin_family = AF_INET;
|
|
s->sin_addr.s_addr = *(bpf_u_int32 *)(ptr + 1); /* copy the address in */
|
|
ptr += *ptr; /* now move the pointer forwards according to the specified length of the address */
|
|
}
|
|
ptr++; /* then forwards one more for the 'length of the address' field */
|
|
if (*ptr) { /* process any netmask */
|
|
if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) {
|
|
pcap_fmt_errmsg_for_errno(errbuf,
|
|
PCAP_ERRBUF_SIZE,
|
|
errno, "malloc");
|
|
return -1;
|
|
}
|
|
/* bzero() is deprecated, replaced with memset() */
|
|
memset((char *)s, 0, sizeof(struct sockaddr_in));
|
|
|
|
addr->netmask = (struct sockaddr *)s;
|
|
s->sin_family = AF_INET;
|
|
s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1);
|
|
ptr += *ptr;
|
|
}
|
|
ptr++;
|
|
if (*ptr) { /* process any broadcast address */
|
|
if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) {
|
|
pcap_fmt_errmsg_for_errno(errbuf,
|
|
PCAP_ERRBUF_SIZE,
|
|
errno, "malloc");
|
|
return -1;
|
|
}
|
|
/* bzero() is deprecated, replaced with memset() */
|
|
memset((char *)s, 0, sizeof(struct sockaddr_in));
|
|
|
|
addr->broadaddr = (struct sockaddr *)s;
|
|
s->sin_family = AF_INET;
|
|
s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1);
|
|
ptr += *ptr;
|
|
}
|
|
ptr++;
|
|
if (*ptr) { /* process any destination address */
|
|
if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) {
|
|
pcap_fmt_errmsg_for_errno(errbuf,
|
|
PCAP_ERRBUF_SIZE,
|
|
errno, "malloc");
|
|
return -1;
|
|
}
|
|
/* bzero() is deprecated, replaced with memset() */
|
|
memset((char *)s, 0, sizeof(struct sockaddr_in));
|
|
|
|
addr->dstaddr = (struct sockaddr *)s;
|
|
s->sin_family = AF_INET;
|
|
s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1);
|
|
ptr += *ptr;
|
|
}
|
|
ptr++;
|
|
prev_addr = addr;
|
|
}
|
|
prev_iff = iff;
|
|
|
|
newname = translate_IOP_to_pcap_name(u, iff->name, interfaceType); /* add a translation entry and get a point to the mangled name */
|
|
bigger_buffer = realloc(iff->name, strlen(newname) + 1);
|
|
if (bigger_buffer == NULL) { /* we now re-write the name stored in the interface list */
|
|
pcap_fmt_errmsg_for_errno(errbuf,
|
|
PCAP_ERRBUF_SIZE, errno, "realloc");
|
|
return -1;
|
|
}
|
|
iff->name = bigger_buffer;
|
|
strcpy(iff->name, newname); /* to this new name */
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int read_client_data (int fd) {
|
|
unsigned char buf[256];
|
|
int chassis, geoslot;
|
|
unit_t *u;
|
|
int len;
|
|
|
|
find_unit_by_fd(fd, &chassis, &geoslot, &u);
|
|
|
|
if ((len = recv(fd, buf, sizeof(buf), 0)) <= 0) return 0; /* read in whatever data was sent to us */
|
|
|
|
if ((u->imsg = realloc(u->imsg, (u->len + len))) == NULL) /* extend the buffer for the new data */
|
|
return 0;
|
|
memcpy((u->imsg + u->len), buf, len); /* append the new data */
|
|
u->len += len;
|
|
return 1;
|
|
}
|
|
|
|
static void wait_for_all_answers(void) {
|
|
int retval;
|
|
struct timeval tv;
|
|
int fd;
|
|
int chassis, geoslot;
|
|
|
|
tv.tv_sec = 2;
|
|
tv.tv_usec = 0;
|
|
|
|
while (1) {
|
|
int flag = 0;
|
|
fd_set working_set;
|
|
|
|
for (fd = 0; fd <= max_fs; fd++) { /* scan the list of descriptors we may be listening to */
|
|
if (FD_ISSET(fd, &readfds)) flag = 1; /* and see if there are any still set */
|
|
}
|
|
if (flag == 0) return; /* we are done, when they are all gone */
|
|
|
|
memcpy(&working_set, &readfds, sizeof(readfds)); /* otherwise, we still have to listen for more stuff, till we timeout */
|
|
retval = select(max_fs + 1, &working_set, NULL, NULL, &tv);
|
|
if (retval == -1) { /* an error occurred !!!!! */
|
|
return;
|
|
} else if (retval == 0) { /* timeout occurred, so process what we've got sofar and return */
|
|
printf("timeout\n");
|
|
return;
|
|
} else {
|
|
for (fd = 0; fd <= max_fs; fd++) { /* scan the list of things to do, and do them */
|
|
if (FD_ISSET(fd, &working_set)) {
|
|
if (read_client_data(fd) == 0) { /* if the socket has closed */
|
|
FD_CLR(fd, &readfds); /* and descriptors we listen to for errors */
|
|
find_unit_by_fd(fd, &chassis, &geoslot, NULL);
|
|
close_with_IOP(chassis, geoslot, FIND); /* and close out connection to him */
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static char *get_error_response(int fd, char *errbuf) { /* return a pointer on error, NULL on no error */
|
|
char byte;
|
|
int len = 0;
|
|
|
|
while (1) {
|
|
recv(fd, &byte, 1, 0); /* read another byte in */
|
|
if (errbuf && (len++ < PCAP_ERRBUF_SIZE)) { /* and if there is still room in the buffer */
|
|
*errbuf++ = byte; /* stick it in */
|
|
*errbuf = '\0'; /* ensure the string is null terminated just in case we might exceed the buffer's size */
|
|
}
|
|
if (byte == '\0') {
|
|
if (len > 1) { return errbuf; }
|
|
else { return NULL; }
|
|
}
|
|
}
|
|
}
|
|
|
|
int acn_findalldevs(char *errbuf) { /* returns: -1 = error, 0 = OK */
|
|
int chassis, geoslot;
|
|
unit_t *u;
|
|
|
|
FD_ZERO(&readfds);
|
|
max_fs = 0;
|
|
for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) {
|
|
for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) {
|
|
u = &units[chassis][geoslot];
|
|
if (u->ip && (open_with_IOP(u, FIND))) { /* connect to the remote IOP */
|
|
send_to_fd(u->find_fd, 1, (unsigned char *)"\0");
|
|
if (get_error_response(u->find_fd, errbuf))
|
|
close_with_IOP(chassis, geoslot, FIND);
|
|
else {
|
|
if (u->find_fd > max_fs)
|
|
max_fs = u->find_fd; /* remember the highest number currently in use */
|
|
FD_SET(u->find_fd, &readfds); /* we are going to want to read this guy's response to */
|
|
u->len = 0;
|
|
send_to_fd(u->find_fd, 1, (unsigned char *)"Q"); /* this interface query request */
|
|
}
|
|
}
|
|
}
|
|
}
|
|
wait_for_all_answers();
|
|
if (process_client_data(errbuf))
|
|
return -1;
|
|
sort_if_table();
|
|
return 0;
|
|
}
|
|
|
|
static int pcap_stats_acn(pcap_t *handle, struct pcap_stat *ps) {
|
|
unsigned char buf[12];
|
|
|
|
send_to_fd(handle->fd, 1, (unsigned char *)"S"); /* send the get_stats command to the IOP */
|
|
|
|
if (read_client_nbytes(handle->fd, sizeof(buf), buf) == -1) return -1; /* try reading the required bytes */
|
|
|
|
ps->ps_recv = ntohl(*(uint32_t *)&buf[0]); /* break the buffer into its three 32 bit components */
|
|
ps->ps_drop = ntohl(*(uint32_t *)&buf[4]);
|
|
ps->ps_ifdrop = ntohl(*(uint32_t *)&buf[8]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int acn_open_live(const char *name, char *errbuf, int *linktype) { /* returns 0 on error, else returns the file descriptor */
|
|
int chassis, geoslot;
|
|
unit_t *u;
|
|
iface_t *p;
|
|
pcap_if_list_t devlist;
|
|
|
|
pcap_platform_finddevs(&devlist, errbuf);
|
|
for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { /* scan the table... */
|
|
for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) {
|
|
u = &units[chassis][geoslot];
|
|
if (u->ip != NULL) {
|
|
p = u->iface;
|
|
while (p) { /* and all interfaces... */
|
|
if (p->IOPname && p->name && (strcmp(p->name, name) == 0)) { /* and if we found the interface we want... */
|
|
*linktype = p->iftype;
|
|
open_with_IOP(u, LIVE); /* start a connection with that IOP */
|
|
send_to_fd(u->fd, strlen(p->IOPname)+1, (unsigned char *)p->IOPname); /* send the IOP's interface name, and a terminating null */
|
|
if (get_error_response(u->fd, errbuf)) {
|
|
return -1;
|
|
}
|
|
return u->fd; /* and return that open descriptor */
|
|
}
|
|
p = p->next;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return -1; /* if the interface wasn't found, return an error */
|
|
}
|
|
|
|
static void acn_start_monitor(int fd, int snaplen, int timeout, int promiscuous, int direction) {
|
|
unsigned char buf[8];
|
|
unit_t *u;
|
|
|
|
//printf("acn_start_monitor()\n"); // fulko
|
|
find_unit_by_fd(fd, NULL, NULL, &u);
|
|
if (u->first_time == 0) {
|
|
buf[0] = 'M';
|
|
*(uint32_t *)&buf[1] = htonl(snaplen);
|
|
buf[5] = timeout;
|
|
buf[6] = promiscuous;
|
|
buf[7] = direction;
|
|
//printf("acn_start_monitor() first time\n"); // fulko
|
|
send_to_fd(fd, 8, buf); /* send the start monitor command with its parameters to the IOP */
|
|
u->first_time = 1;
|
|
}
|
|
//printf("acn_start_monitor() complete\n"); // fulko
|
|
}
|
|
|
|
static int pcap_inject_acn(pcap_t *p, const void *buf _U_, int size _U_) {
|
|
pcap_strlcpy(p->errbuf, "Sending packets isn't supported on ACN adapters",
|
|
PCAP_ERRBUF_SIZE);
|
|
return (-1);
|
|
}
|
|
|
|
static int pcap_setfilter_acn(pcap_t *handle, struct bpf_program *bpf) {
|
|
int fd = handle->fd;
|
|
int count;
|
|
struct bpf_insn *p;
|
|
uint16_t shortInt;
|
|
uint32_t longInt;
|
|
|
|
send_to_fd(fd, 1, (unsigned char *)"F"); /* BPF filter follows command */
|
|
count = bpf->bf_len;
|
|
longInt = htonl(count);
|
|
send_to_fd(fd, 4, (unsigned char *)&longInt); /* send the instruction sequence count */
|
|
p = bpf->bf_insns;
|
|
while (count--) { /* followed by the list of instructions */
|
|
shortInt = htons(p->code);
|
|
longInt = htonl(p->k);
|
|
send_to_fd(fd, 2, (unsigned char *)&shortInt);
|
|
send_to_fd(fd, 1, (unsigned char *)&p->jt);
|
|
send_to_fd(fd, 1, (unsigned char *)&p->jf);
|
|
send_to_fd(fd, 4, (unsigned char *)&longInt);
|
|
p++;
|
|
}
|
|
if (get_error_response(fd, NULL))
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
static int acn_read_n_bytes_with_timeout(pcap_t *handle, int count) {
|
|
struct timeval tv;
|
|
int retval, fd;
|
|
fd_set r_fds;
|
|
fd_set w_fds;
|
|
u_char *bp;
|
|
int len = 0;
|
|
int offset = 0;
|
|
|
|
tv.tv_sec = 5;
|
|
tv.tv_usec = 0;
|
|
|
|
fd = handle->fd;
|
|
FD_ZERO(&r_fds);
|
|
FD_SET(fd, &r_fds);
|
|
memcpy(&w_fds, &r_fds, sizeof(r_fds));
|
|
bp = handle->bp;
|
|
while (count) {
|
|
retval = select(fd + 1, &w_fds, NULL, NULL, &tv);
|
|
if (retval == -1) { /* an error occurred !!!!! */
|
|
// fprintf(stderr, "error during packet data read\n");
|
|
return -1; /* but we need to return a good indication to prevent unnecessary popups */
|
|
} else if (retval == 0) { /* timeout occurred, so process what we've got sofar and return */
|
|
// fprintf(stderr, "timeout during packet data read\n");
|
|
return -1;
|
|
} else {
|
|
if ((len = recv(fd, (bp + offset), count, 0)) <= 0) {
|
|
// fprintf(stderr, "premature exit during packet data rx\n");
|
|
return -1;
|
|
}
|
|
count -= len;
|
|
offset += len;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int pcap_read_acn(pcap_t *handle, int max_packets, pcap_handler callback, u_char *user) {
|
|
#define HEADER_SIZE (4 * 4)
|
|
unsigned char packet_header[HEADER_SIZE];
|
|
struct pcap_pkthdr pcap_header;
|
|
|
|
//printf("pcap_read_acn()\n"); // fulko
|
|
acn_start_monitor(handle->fd, handle->snapshot, handle->opt.timeout, handle->opt.promisc, handle->direction); /* maybe tell him to start monitoring */
|
|
//printf("pcap_read_acn() after start monitor\n"); // fulko
|
|
|
|
handle->bp = packet_header;
|
|
if (acn_read_n_bytes_with_timeout(handle, HEADER_SIZE) == -1) return 0; /* try to read a packet header in so we can get the sizeof the packet data */
|
|
|
|
pcap_header.ts.tv_sec = ntohl(*(uint32_t *)&packet_header[0]); /* tv_sec */
|
|
pcap_header.ts.tv_usec = ntohl(*(uint32_t *)&packet_header[4]); /* tv_usec */
|
|
pcap_header.caplen = ntohl(*(uint32_t *)&packet_header[8]); /* caplen */
|
|
pcap_header.len = ntohl(*(uint32_t *)&packet_header[12]); /* len */
|
|
|
|
handle->bp = (u_char *)handle->buffer + handle->offset; /* start off the receive pointer at the right spot */
|
|
if (acn_read_n_bytes_with_timeout(handle, pcap_header.caplen) == -1) return 0; /* then try to read in the rest of the data */
|
|
|
|
callback(user, &pcap_header, handle->bp); /* call the user supplied callback function */
|
|
return 1;
|
|
}
|
|
|
|
static int pcap_activate_sita(pcap_t *handle) {
|
|
int fd;
|
|
|
|
if (handle->opt.rfmon) {
|
|
/*
|
|
* No monitor mode on SITA devices (they're not Wi-Fi
|
|
* devices).
|
|
*/
|
|
return PCAP_ERROR_RFMON_NOTSUP;
|
|
}
|
|
|
|
/* Initialize some components of the pcap structure. */
|
|
|
|
handle->inject_op = pcap_inject_acn;
|
|
handle->setfilter_op = pcap_setfilter_acn;
|
|
handle->setdirection_op = NULL; /* Not implemented */
|
|
handle->set_datalink_op = NULL; /* can't change data link type */
|
|
handle->getnonblock_op = pcap_getnonblock_fd;
|
|
handle->setnonblock_op = pcap_setnonblock_fd;
|
|
handle->cleanup_op = pcap_cleanup_acn;
|
|
handle->read_op = pcap_read_acn;
|
|
handle->stats_op = pcap_stats_acn;
|
|
|
|
fd = acn_open_live(handle->opt.device, handle->errbuf,
|
|
&handle->linktype);
|
|
if (fd == -1)
|
|
return PCAP_ERROR;
|
|
|
|
/*
|
|
* Turn a negative snapshot value (invalid), a snapshot value of
|
|
* 0 (unspecified), or a value bigger than the normal maximum
|
|
* value, into the maximum allowed value.
|
|
*
|
|
* If some application really *needs* a bigger snapshot
|
|
* length, we should just increase MAXIMUM_SNAPLEN.
|
|
*/
|
|
if (handle->snapshot <= 0 || handle->snapshot > MAXIMUM_SNAPLEN)
|
|
handle->snapshot = MAXIMUM_SNAPLEN;
|
|
|
|
handle->fd = fd;
|
|
handle->bufsize = handle->snapshot;
|
|
|
|
/* Allocate the buffer */
|
|
|
|
handle->buffer = malloc(handle->bufsize + handle->offset);
|
|
if (!handle->buffer) {
|
|
pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE,
|
|
errno, "malloc");
|
|
pcap_cleanup_acn(handle);
|
|
return PCAP_ERROR;
|
|
}
|
|
|
|
/*
|
|
* "handle->fd" is a socket, so "select()" and "poll()"
|
|
* should work on it.
|
|
*/
|
|
handle->selectable_fd = handle->fd;
|
|
|
|
return 0;
|
|
}
|
|
|
|
pcap_t *pcap_create_interface(const char *device _U_, char *ebuf) {
|
|
pcap_t *p;
|
|
|
|
p = PCAP_CREATE_COMMON(ebuf, struct pcap_sita);
|
|
if (p == NULL)
|
|
return (NULL);
|
|
|
|
p->activate_op = pcap_activate_sita;
|
|
return (p);
|
|
}
|
|
|
|
int pcap_platform_finddevs(pcap_if_list_t *devlistp, char *errbuf) {
|
|
|
|
//printf("pcap_findalldevs()\n"); // fulko
|
|
|
|
*alldevsp = 0; /* initialize the returned variables before we do anything */
|
|
strcpy(errbuf, "");
|
|
if (acn_parse_hosts_file(errbuf)) /* scan the hosts file for potential IOPs */
|
|
{
|
|
//printf("pcap_findalldevs() returning BAD after parsehosts\n"); // fulko
|
|
return -1;
|
|
}
|
|
//printf("pcap_findalldevs() got hostlist now finding devs\n"); // fulko
|
|
if (acn_findalldevs(errbuf)) /* then ask the IOPs for their monitorable devices */
|
|
{
|
|
//printf("pcap_findalldevs() returning BAD after findalldevs\n"); // fulko
|
|
return -1;
|
|
}
|
|
devlistp->beginning = acn_if_list;
|
|
acn_if_list = 0; /* then forget our list head, because someone will call pcap_freealldevs() to empty the malloc'ed stuff */
|
|
//printf("pcap_findalldevs() returning ZERO OK\n"); // fulko
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Libpcap version string.
|
|
*/
|
|
const char *
|
|
pcap_lib_version(void)
|
|
{
|
|
return PCAP_VERSION_STRING " (SITA-only)";
|
|
}
|