* pcap-sita.c: Packet capture interface additions for SITA ACN devices

/* $NetBSD: pcap-sita.c,v 1.8 2024/09/02 15:33:37 christos Exp $ */

/*
* pcap-sita.c: Packet capture interface additions for SITA ACN devices
*
* Copyright (c) 2007 Fulko Hew, SITA INC Canada, Inc <[email protected]>
*
* License: BSD
*
* 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. The names of the authors may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/

#include <sys/cdefs.h>
__RCSID("$NetBSD: pcap-sita.c,v 1.8 2024/09/02 15:33:37 christos Exp $");

#include <config.h>

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "pcap-int.h"

#include "pcap-sita.h"

/* non-configurable manifests follow */

#define IOP_SNIFFER_PORT 49152 /* TCP port on the IOP used for 'distributed pcap' usage */
#define MAX_LINE_SIZE 255 /* max size of a buffer/line in /etc/hosts we allow */
#define MAX_CHASSIS 8 /* number of chassis in an ACN site */
#define MAX_GEOSLOT 8 /* max number of access units in an ACN site */

#define FIND 0
#define LIVE 1

typedef struct iface {
struct iface *next; /* a pointer to the next interface */
char *name; /* this interface's name */
char *IOPname; /* this interface's name on an IOP */
uint32_t iftype; /* the type of interface (DLT values) */
} iface_t;

typedef struct unit {
char *ip; /* this unit's IP address (as extracted from /etc/hosts) */
int fd; /* the connection to this unit (if it exists) */
int find_fd; /* a big kludge to avoid my programming limitations since I could have this unit open for findalldevs purposes */
int first_time; /* 0 = just opened via acn_open_live(), ie. the first time, NZ = nth time */
struct sockaddr_in *serv_addr; /* the address control block for comms to this unit */
int chassis;
int geoslot;
iface_t *iface; /* a pointer to a linked list of interface structures */
char *imsg; /* a pointer to an inbound message */
int len; /* the current size of the inbound message */
} unit_t;

/*
* Private data.
* Currently contains nothing.
*/
struct pcap_sita {
int dummy;
};

static unit_t units[MAX_CHASSIS+1][MAX_GEOSLOT+1]; /* we use indexes of 1 through 8, but we reserve/waste index 0 */
static fd_set readfds; /* a place to store the file descriptors for the connections to the IOPs */
static int max_fs;

pcap_if_t *acn_if_list; /* pcap's list of available interfaces */

static void dump_interface_list(void) {
pcap_if_t *iff;
pcap_addr_t *addr;
int longest_name_len = 0;
char *n, *d, *f;
int if_number = 0;

iff = acn_if_list;
while (iff) {
if (iff->name && (strlen(iff->name) > longest_name_len)) longest_name_len = strlen(iff->name);
iff = iff->next;
}
iff = acn_if_list;
printf("Interface List:\n");
while (iff) {
n = (iff->name) ? iff->name : "";
d = (iff->description) ? iff->description : "";
f = (iff->flags == PCAP_IF_LOOPBACK) ? "L" : "";
printf("%3d: %*s %s '%s'\n", if_number++, longest_name_len, n, f, d);
addr = iff->addresses;
while (addr) {
printf("%*s ", (5 + longest_name_len), ""); /* add some indentation */
printf("%15s ", (addr->addr) ? inet_ntoa(((struct sockaddr_in *)addr->addr)->sin_addr) : "");
printf("%15s ", (addr->netmask) ? inet_ntoa(((struct sockaddr_in *)addr->netmask)->sin_addr) : "");
printf("%15s ", (addr->broadaddr) ? inet_ntoa(((struct sockaddr_in *)addr->broadaddr)->sin_addr) : "");
printf("%15s ", (addr->dstaddr) ? inet_ntoa(((struct sockaddr_in *)addr->dstaddr)->sin_addr) : "");
printf("\n");
addr = addr->next;
}
iff = iff->next;
}
}

static void dump(unsigned char *ptr, int i, int indent) {
fprintf(stderr, "%*s", indent, " ");
for (; i > 0; i--) {
fprintf(stderr, "%2.2x ", *ptr++);
}
fprintf(stderr, "\n");
}

static void dump_interface_list_p(void) {
pcap_if_t *iff;
pcap_addr_t *addr;
int if_number = 0;

iff = acn_if_list;
printf("Interface Pointer @ %p is %p:\n", &acn_if_list, iff);
while (iff) {
printf("%3d: %p %p next: %p\n", if_number++, iff->name, iff->description, iff->next);
dump((unsigned char *)iff, sizeof(pcap_if_t), 5);
addr = iff->addresses;
while (addr) {
printf(" %p %p %p %p, next: %p\n", addr->addr, addr->netmask, addr->broadaddr, addr->dstaddr, addr->next);
dump((unsigned char *)addr, sizeof(pcap_addr_t), 10);
addr = addr->next;
}
iff = iff->next;
}
}

static void dump_unit_table(void) {
int chassis, geoslot;
iface_t *p;

printf("%c:%c %s %s\n", 'C', 'S', "fd", "IP Address");
for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) {
for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) {
if (units[chassis][geoslot].ip != NULL)
printf("%d:%d %2d %s\n", chassis, geoslot, units[chassis][geoslot].fd, units[chassis][geoslot].ip);
p = units[chassis][geoslot].iface;
while (p) {
char *n = (p->name) ? p->name : "";
char *i = (p->IOPname) ? p->IOPname : "";
p = p->next;
printf(" %12s -> %12s\n", i, n);
}
}
}
}

static int find_unit_by_fd(int fd, int *chassis, int *geoslot, unit_t **unit_ptr) {
int c, s;

for (c = 0; c <= MAX_CHASSIS; c++) {
for (s = 0; s <= MAX_GEOSLOT; s++) {
if (units[c][s].fd == fd || units[c][s].find_fd == fd) {
if (chassis) *chassis = c;
if (geoslot) *geoslot = s;
if (unit_ptr) *unit_ptr = &units[c][s];
return 1;
}
}
}
return 0;
}

static int read_client_nbytes(int fd, int count, unsigned char *buf) {
unit_t *u;
int chassis, geoslot;
int len;

find_unit_by_fd(fd, &chassis, &geoslot, &u);
while (count) {
if ((len = recv(fd, buf, count, 0)) <= 0) return -1; /* read in whatever data was sent to us */
count -= len;
buf += len;
} /* till we have everything we are looking for */
return 0;
}

static void empty_unit_iface(unit_t *u) {
iface_t *p, *cur;

cur = u->iface;
while (cur) { /* loop over all the interface entries */
if (cur->name) free(cur->name); /* throwing away the contents if they exist */
if (cur->IOPname) free(cur->IOPname);
p = cur->next;
free(cur); /* then throw away the structure itself */
cur = p;
}
u->iface = 0; /* and finally remember that there are no remaining structure */
}

static void empty_unit(int chassis, int geoslot) {
unit_t *u = &units[chassis][geoslot];

empty_unit_iface(u);
if (u->imsg) { /* then if an inbound message buffer exists */
void *bigger_buffer;

bigger_buffer = (char *)realloc(u->imsg, 1); /* and re-allocate the old large buffer into a new small one */
if (bigger_buffer == NULL) { /* oops, realloc call failed */
fprintf(stderr, "Warning...call to realloc() failed, value of errno is %d\n", errno);
return;
}
u->imsg = bigger_buffer;
}
}

static void empty_unit_table(void) {
int chassis, geoslot;

for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) {
for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) {
if (units[chassis][geoslot].ip != NULL) {
free(units[chassis][geoslot].ip); /* get rid of the malloc'ed space that holds the IP address */
units[chassis][geoslot].ip = 0; /* then set the pointer to NULL */
}
empty_unit(chassis, geoslot);
}
}
}

static char *find_nth_interface_name(int n) {
int chassis, geoslot;
iface_t *p;
char *last_name = 0;

if (n < 0) n = 0; /* ensure we are working with a valid number */
for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { /* scan the table... */
for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) {
if (units[chassis][geoslot].ip != NULL) {
p = units[chassis][geoslot].iface;
while (p) { /* and all interfaces... */
if (p->IOPname) last_name = p->name; /* remembering the last name found */
if (n-- == 0) return last_name; /* and if we hit the instance requested */
p = p->next;
}
}
}
}
/* if we couldn't fine the selected entry */
if (last_name) return last_name; /* ... but we did have at least one entry... return the last entry found */
return ""; /* ... but if there wasn't any entry... return an empty string instead */
}

int acn_parse_hosts_file(char *errbuf) { /* returns: -1 = error, 0 = OK */
FILE *fp;
char buf[MAX_LINE_SIZE];
char *ptr, *ptr2;
int pos;
int chassis, geoslot;
unit_t *u;

empty_unit_table();
if ((fp = fopen("/etc/hosts", "r")) == NULL) { /* try to open the hosts file and if it fails */
snprintf(errbuf, PCAP_ERRBUF_SIZE, "Cannot open '/etc/hosts' for reading."); /* return the nohostsfile error response */
return -1;
}
while (fgets(buf, MAX_LINE_SIZE-1, fp)) { /* while looping over the file */

pos = strcspn(buf, "#\n\r"); /* find the first comment character or EOL */
*(buf + pos) = '\0'; /* and clobber it and anything that follows it */

pos = strspn(buf, " \t"); /* then find the first non-white space */
if (pos == strlen(buf)) /* if there is nothing but white space on the line */
continue; /* ignore that empty line */
ptr = buf + pos; /* and skip over any of that leading whitespace */

if ((ptr2 = strstr(ptr, "_I_")) == NULL) /* skip any lines that don't have names that look like they belong to IOPs */
continue;
if (*(ptr2 + 4) != '_') /* and skip other lines that have names that don't look like ACN components */
continue;
*(ptr + strcspn(ptr, " \t")) = '\0'; /* null terminate the IP address so its a standalone string */

chassis = *(ptr2 + 3) - '0'; /* extract the chassis number */
geoslot = *(ptr2 + 5) - '0'; /* and geo-slot number */
if (chassis < 1 || chassis > MAX_CHASSIS ||
geoslot < 1 || geoslot > MAX_GEOSLOT) { /* if the chassis and/or slot numbers appear to be bad... */
snprintf(errbuf, PCAP_ERRBUF_SIZE, "Invalid ACN name in '/etc/hosts'."); /* warn the user */
continue; /* and ignore the entry */
}
ptr2 = strdup(ptr); /* copy the IP address into our malloc'ed memory */
if (ptr2 == NULL) {
pcapint_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
errno, "malloc");
continue;
}
u = &units[chassis][geoslot];
u->ip = ptr2; /* and remember the whole shebang */
u->chassis = chassis;
u->geoslot = geoslot;
}
fclose(fp);
if (*errbuf) return -1;
else return 0;
}

static int open_with_IOP(unit_t *u, int flag) {
int sockfd;
char *ip;

if (u->serv_addr == NULL) {
u->serv_addr = malloc(sizeof(struct sockaddr_in));

/* since we called malloc(), lets check to see if we actually got the memory */
if (u->serv_addr == NULL) { /* oops, we didn't get the memory requested */
fprintf(stderr, "malloc() request for u->serv_addr failed, value of errno is: %d\n", errno);
return 0;
}

}
ip = u->ip;
/* bzero() is deprecated, replaced with memset() */
memset((char *)u->serv_addr, 0, sizeof(struct sockaddr_in));
u->serv_addr->sin_family = AF_INET;
u->serv_addr->sin_addr.s_addr = inet_addr(ip);
u->serv_addr->sin_port = htons(IOP_SNIFFER_PORT);

if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
fprintf(stderr, "pcap can't open a socket for connecting to IOP at %s\n", ip);
return 0;
}
if (connect(sockfd, (struct sockaddr *)u->serv_addr, sizeof(struct sockaddr_in)) < 0) {
fprintf(stderr, "pcap can't connect to IOP at %s\n", ip);
return 0;
}
if (flag == LIVE) u->fd = sockfd;
else u->find_fd = sockfd;
u->first_time = 0;
return sockfd; /* return the non-zero file descriptor as a 'success' indicator */
}

static void close_with_IOP(int chassis, int geoslot, int flag) {
int *id;

if (flag == LIVE) id = &units[chassis][geoslot].fd;
else id = &units[chassis][geoslot].find_fd;

if (*id) { /* this was the last time, so... if we are connected... */
close(*id); /* disconnect us */
*id = 0; /* and forget that the descriptor exists because we are not open */
}
}

static void pcap_cleanup_acn(pcap_t *handle) {
int chassis, geoslot;
unit_t *u;

if (find_unit_by_fd(handle->fd, &chassis, &geoslot, &u) == 0)
return;
close_with_IOP(chassis, geoslot, LIVE);
if (u)
u->first_time = 0;
pcapint_cleanup_live_common(handle);
}

static void send_to_fd(int fd, int len, unsigned char *str) {
int nwritten;
int chassis, geoslot;

while (len > 0) {
if ((nwritten = write(fd, str, len)) <= 0) {
find_unit_by_fd(fd, &chassis, &geoslot, NULL);
if (units[chassis][geoslot].fd == fd) close_with_IOP(chassis, geoslot, LIVE);
else if (units[chassis][geoslot].find_fd == fd) close_with_IOP(chassis, geoslot, FIND);
empty_unit(chassis, geoslot);
return;
}
len -= nwritten;
str += nwritten;
}
}

static void acn_freealldevs(void) {

pcap_if_t *iff, *next_iff;
pcap_addr_t *addr, *next_addr;

for (iff = acn_if_list; iff != NULL; iff = next_iff) {
next_iff = iff->next;
for (addr = iff->addresses; addr != NULL; addr = next_addr) {
next_addr = addr->next;
if (addr->addr) free(addr->addr);
if (addr->netmask) free(addr->netmask);
if (addr->broadaddr) free(addr->broadaddr);
if (addr->dstaddr) free(addr->dstaddr);
free(addr);
}
if (iff->name) free(iff->name);
if (iff->description) free(iff->description);
free(iff);
}
}

static void nonUnified_IOP_port_name(char *buf, size_t bufsize, const char *proto, unit_t *u) {

snprintf(buf, bufsize, "%s_%d_%d", proto, u->chassis, u->geoslot);
}

static void unified_IOP_port_name(char *buf, size_t bufsize, const char *proto, unit_t *u, int IOPportnum) {
int portnum;

portnum = ((u->chassis - 1) * 64) + ((u->geoslot - 1) * 8) + IOPportnum + 1;
snprintf(buf, bufsize, "%s_%d", proto, portnum);
}

static char *translate_IOP_to_pcap_name(unit_t *u, char *IOPname, bpf_u_int32 iftype) {
iface_t *iface_ptr, *iface;
char buf[32];
char *proto;
char *port;
int IOPportnum = 0;

iface = malloc(sizeof(iface_t)); /* get memory for a structure */
if (iface == NULL) { /* oops, we didn't get the memory requested */
fprintf(stderr, "Error...couldn't allocate memory for interface structure...value of errno is: %d\n", errno);
return NULL;
}
memset((char *)iface, 0, sizeof(iface_t)); /* bzero is deprecated(), replaced with memset() */

iface->iftype = iftype; /* remember the interface type of this interface */

iface->IOPname = strdup(IOPname); /* copy it and stick it into the structure */
if (iface->IOPname == NULL) { /* oops, we didn't get the memory requested */
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) { /* otherwise 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) {
pcapint_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 */
pcapint_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 */
pcapint_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) {
pcapint_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 */
pcapint_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) {
pcapint_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) {
pcapint_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) {
pcapint_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 */
pcapint_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;

pcapint_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_) {
pcapint_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 = pcapint_getnonblock_fd;
handle->setnonblock_op = pcapint_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) {
pcapint_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 *pcapint_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 pcapint_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 parse_hosts\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)";
}