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addr_resolv.c
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/* addr_resolv.c
* Routines for network object lookup
*
* Laurent Deniel <[email protected]>
*
* Add option to resolv VLAN ID to describing name
* Uli Heilmeier, March 2016
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <[email protected]>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <wsutil/strtoi.h>
#include <wsutil/ws_assert.h>
/*
* Win32 doesn't have SIGALRM (and it's the OS where name lookup calls
* are most likely to take a long time, given the way address-to-name
* lookups are done over NBNS).
*
* macOS does have SIGALRM, but if you longjmp() out of a name resolution
* call in a signal handler, you might crash, because the state of the
* resolution code that sends messages to lookupd might be inconsistent
* if you jump out of it in middle of a call.
*
* There's no guarantee that longjmp()ing out of name resolution calls
* will work on *any* platform; OpenBSD got rid of the alarm/longjmp
* code in tcpdump, to avoid those sorts of problems, and that was
* picked up by tcpdump.org tcpdump.
*
* So, for now, we do not use alarm() and SIGALRM to time out host name
* lookups. If we get a lot of complaints about lookups taking a long time,
* we can reconsider that decision. (Note that tcpdump originally added
* such a timeout mechanism that for the benefit of systems using NIS to
* look up host names; that might now be fixed in NIS implementations, for
* those sites still using NIS rather than DNS for that.... tcpdump no
* longer does that, for the same reasons that we don't.)
*
* If we're using an asynchronous DNS resolver, that shouldn't be an issue.
* If we're using a synchronous name lookup mechanism (which we'd do mainly
* to support resolving addresses and host names using more mechanisms than
* just DNS, such as NIS, NBNS, or Mr. Hosts File), we could do that in
* a separate thread, making it, in effect, asynchronous.
*/
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h> /* needed to define AF_ values on UNIX */
#endif
#ifdef _WIN32
#include <winsock2.h> /* needed to define AF_ values on Windows */
#include <ws2tcpip.h>
#endif
#ifdef _WIN32
# define socklen_t unsigned int
#endif
#include <ares.h>
#include <ares_version.h>
#include <glib.h>
#include "packet.h"
#include "addr_and_mask.h"
#include "ipv6.h"
#include "addr_resolv.h"
#include "wsutil/filesystem.h"
#include <wsutil/report_message.h>
#include <wsutil/file_util.h>
#include <wsutil/pint.h>
#include <wsutil/inet_addr.h>
#include <epan/strutil.h>
#include <epan/to_str.h>
#include <epan/maxmind_db.h>
#include <epan/prefs.h>
#include <epan/uat.h>
#define ENAME_HOSTS "hosts"
#define ENAME_SUBNETS "subnets"
#define ENAME_ETHERS "ethers"
#define ENAME_IPXNETS "ipxnets"
#define ENAME_MANUF "manuf"
#define ENAME_WKA "wka"
#define ENAME_SERVICES "services"
#define ENAME_VLANS "vlans"
#define ENAME_SS7PCS "ss7pcs"
#define ENAME_ENTERPRISES "enterprises.tsv"
#define HASHETHSIZE 2048
#define HASHHOSTSIZE 2048
#define HASHIPXNETSIZE 256
#define SUBNETLENGTHSIZE 32 /*1-32 inc.*/
/* hash table used for IPv4 lookup */
#define HASH_IPV4_ADDRESS(addr) (g_htonl(addr) & (HASHHOSTSIZE - 1))
typedef struct sub_net_hashipv4 {
guint addr;
/* XXX: No longer needed?*/
guint8 flags; /* B0 dummy_entry, B1 resolve, B2 If the address is used in the trace */
struct sub_net_hashipv4 *next;
gchar name[MAXNAMELEN];
} sub_net_hashipv4_t;
/* Array of entries of subnets of different lengths */
typedef struct {
gsize mask_length; /*1-32*/
guint32 mask; /* e.g. 255.255.255.*/
sub_net_hashipv4_t** subnet_addresses; /* Hash table of subnet addresses */
} subnet_length_entry_t;
/* hash table used for IPX network lookup */
/* XXX - check goodness of hash function */
#define HASH_IPX_NET(net) ((net) & (HASHIPXNETSIZE - 1))
typedef struct hashipxnet {
guint addr;
struct hashipxnet *next;
gchar name[MAXNAMELEN];
} hashipxnet_t;
typedef struct hashvlan {
guint id;
/* struct hashvlan *next; */
gchar name[MAXVLANNAMELEN];
} hashvlan_t;
typedef struct ss7pc {
guint32 id; /* 1st byte NI, 3 following bytes: Point Code */
gchar pc_addr[MAXNAMELEN];
gchar name[MAXNAMELEN];
} hashss7pc_t;
/* hash tables used for ethernet and manufacturer lookup */
#define HASHETHER_STATUS_UNRESOLVED 1
#define HASHETHER_STATUS_RESOLVED_DUMMY 2
#define HASHETHER_STATUS_RESOLVED_NAME 3
struct hashether {
guint status; /* (See above) */
guint8 addr[6];
char hexaddr[6*3];
char resolved_name[MAXNAMELEN];
};
struct hashmanuf {
guint status; /* (See above) */
guint8 addr[3];
char hexaddr[3*3];
char resolved_name[MAXNAMELEN];
char resolved_longname[MAXNAMELEN];
};
/* internal ethernet type */
typedef struct _ether
{
guint8 addr[6];
char name[MAXNAMELEN];
char longname[MAXNAMELEN];
} ether_t;
/* internal ipxnet type */
typedef struct _ipxnet
{
guint addr;
char name[MAXNAMELEN];
} ipxnet_t;
/* internal vlan type */
typedef struct _vlan
{
guint id;
char name[MAXVLANNAMELEN];
} vlan_t;
// Maps guint -> hashipxnet_t*
static wmem_map_t *ipxnet_hash_table = NULL;
static wmem_map_t *ipv4_hash_table = NULL;
static wmem_map_t *ipv6_hash_table = NULL;
// Maps guint -> hashvlan_t*
static wmem_map_t *vlan_hash_table = NULL;
static wmem_map_t *ss7pc_hash_table = NULL;
// Maps IP address -> manually set hostname.
static wmem_map_t *manually_resolved_ipv4_list = NULL;
static wmem_map_t *manually_resolved_ipv6_list = NULL;
static addrinfo_lists_t addrinfo_lists = { NULL, NULL};
struct cb_serv_data {
gchar *service;
port_type proto;
};
// Maps guint -> hashmanuf_t*
static wmem_map_t *manuf_hashtable = NULL;
static wmem_map_t *wka_hashtable = NULL;
static wmem_map_t *eth_hashtable = NULL;
// Maps guint -> serv_port_t*
static wmem_map_t *serv_port_hashtable = NULL;
static GHashTable *enterprises_hashtable = NULL;
static subnet_length_entry_t subnet_length_entries[SUBNETLENGTHSIZE]; /* Ordered array of entries */
static gboolean have_subnet_entry = FALSE;
static gboolean new_resolved_objects = FALSE;
static GPtrArray* extra_hosts_files = NULL;
static hashether_t *add_eth_name(const guint8 *addr, const gchar *name);
static void add_serv_port_cb(const guint32 port, gpointer ptr);
/* http://eternallyconfuzzled.com/tuts/algorithms/jsw_tut_hashing.aspx#existing
* One-at-a-Time hash
*/
guint
ipv6_oat_hash(gconstpointer key)
{
int len = 16;
const unsigned char *p = (const unsigned char *)key;
guint h = 0;
int i;
for ( i = 0; i < len; i++ ) {
h += p[i];
h += ( h << 10 );
h ^= ( h >> 6 );
}
h += ( h << 3 );
h ^= ( h >> 11 );
h += ( h << 15 );
return h;
}
gboolean
ipv6_equal(gconstpointer v1, gconstpointer v2)
{
if (memcmp(v1, v2, sizeof (ws_in6_addr)) == 0) {
return TRUE;
}
return FALSE;
}
/*
* Flag controlling what names to resolve.
*/
e_addr_resolve gbl_resolv_flags = {
TRUE, /* mac_name */
FALSE, /* network_name */
FALSE, /* transport_name */
TRUE, /* dns_pkt_addr_resolution */
TRUE, /* use_external_net_name_resolver */
FALSE, /* load_hosts_file_from_profile_only */
FALSE, /* vlan_name */
FALSE /* ss7 point code names */
};
static guint name_resolve_concurrency = 500;
static gboolean resolve_synchronously = FALSE;
/*
* Global variables (can be changed in GUI sections)
* XXX - they could be changed in GUI code, but there's currently no
* GUI code to change them.
*/
gchar *g_ethers_path = NULL; /* global ethers file */
gchar *g_pethers_path = NULL; /* personal ethers file */
gchar *g_wka_path = NULL; /* global well-known-addresses file */
gchar *g_manuf_path = NULL; /* global manuf file */
gchar *g_ipxnets_path = NULL; /* global ipxnets file */
gchar *g_pipxnets_path = NULL; /* personal ipxnets file */
gchar *g_services_path = NULL; /* global services file */
gchar *g_pservices_path = NULL; /* personal services file */
gchar *g_pvlan_path = NULL; /* personal vlans file */
gchar *g_ss7pcs_path = NULL; /* personal ss7pcs file */
gchar *g_enterprises_path = NULL; /* global enterprises file */
gchar *g_penterprises_path = NULL; /* personal enterprises file */
/* first resolving call */
/*
* Submitted asynchronous queries trigger a callback (c_ares_ghba_cb()).
* Queries are added to c_ares_queue_head. During processing, queries are
* popped off the front of c_ares_queue_head and submitted using
* ares_gethostbyaddr().
* The callback processes the response, then frees the request.
*/
typedef struct _async_dns_queue_msg
{
union {
guint32 ip4;
ws_in6_addr ip6;
} addr;
int family;
} async_dns_queue_msg_t;
typedef struct _async_hostent {
int addr_size;
int copied;
void *addrp;
} async_hostent_t;
/*
* Submitted synchronous queries trigger a callback (c_ares_ghba_sync_cb()).
* The callback processes the response, sets completed to TRUE if
* completed is non-NULL, then frees the request.
*/
typedef struct _sync_dns_data
{
union {
guint32 ip4;
ws_in6_addr ip6;
} addr;
int family;
gboolean *completed;
} sync_dns_data_t;
static ares_channel ghba_chan; /* ares_gethostbyaddr -- Usually non-interactive, no timeout */
static ares_channel ghbn_chan; /* ares_gethostbyname -- Usually interactive, timeout */
static gboolean async_dns_initialized = FALSE;
static guint async_dns_in_flight = 0;
static wmem_list_t *async_dns_queue_head = NULL;
//UAT for providing a list of DNS servers to C-ARES for name resolution
gboolean use_custom_dns_server_list = FALSE;
struct dns_server_data {
char *ipaddr;
};
UAT_CSTRING_CB_DEF(dnsserverlist_uats, ipaddr, struct dns_server_data)
static uat_t *dnsserver_uat = NULL;
static struct dns_server_data *dnsserverlist_uats = NULL;
static guint ndnsservers = 0;
static void
dns_server_free_cb(void *data)
{
struct dns_server_data *h = (struct dns_server_data*)data;
g_free(h->ipaddr);
}
static void*
dns_server_copy_cb(void *dst_, const void *src_, size_t len _U_)
{
const struct dns_server_data *src = (const struct dns_server_data *)src_;
struct dns_server_data *dst = (struct dns_server_data *)dst_;
dst->ipaddr = g_strdup(src->ipaddr);
return dst;
}
static gboolean
dnsserver_uat_fld_ip_chk_cb(void* r _U_, const char* ipaddr, guint len _U_, const void* u1 _U_, const void* u2 _U_, char** err)
{
//Check for a valid IPv4 or IPv6 address.
if (ipaddr && g_hostname_is_ip_address(ipaddr)) {
*err = NULL;
return TRUE;
}
*err = g_strdup_printf("No valid IP address given.");
return FALSE;
}
static void
c_ares_ghba_sync_cb(void *arg, int status, int timeouts _U_, struct hostent *he) {
sync_dns_data_t *sdd = (sync_dns_data_t *)arg;
char **p;
if (status == ARES_SUCCESS) {
for (p = he->h_addr_list; *p != NULL; p++) {
switch(sdd->family) {
case AF_INET:
add_ipv4_name(sdd->addr.ip4, he->h_name);
break;
case AF_INET6:
add_ipv6_name(&sdd->addr.ip6, he->h_name);
break;
default:
/* Throw an exception? */
break;
}
}
}
/*
* Let our caller know that this is complete.
*/
*sdd->completed = TRUE;
/*
* Free the structure for this call.
*/
g_free(sdd);
}
static void
wait_for_sync_resolv(gboolean *completed) {
int nfds;
fd_set rfds, wfds;
struct timeval tv;
while (!*completed) {
/*
* Not yet resolved; wait for something to show up on the
* address-to-name C-ARES channel.
*
* To quote the source code for ares_timeout() as of C-ARES
* 1.12.0, "WARNING: Beware that this is linear in the number
* of outstanding requests! You are probably far better off
* just calling ares_process() once per second, rather than
* calling ares_timeout() to figure out when to next call
* ares_process().", although we should have only one request
* outstanding.
*
* And, yes, we have to reset it each time, as select(), in
* some OSes modifies the timeout to reflect the time remaining
* (e.g., Linux) and select() in other OSes doesn't (most if not
* all other UN*Xes, Windows?), so we can't rely on *either*
* behavior.
*/
tv.tv_sec = 1;
tv.tv_usec = 0;
FD_ZERO(&rfds);
FD_ZERO(&wfds);
nfds = ares_fds(ghba_chan, &rfds, &wfds);
if (nfds > 0) {
if (select(nfds, &rfds, &wfds, NULL, &tv) == -1) { /* call to select() failed */
/* If it's interrupted by a signal, no need to put out a message */
if (errno != EINTR)
fprintf(stderr, "Warning: call to select() failed, error is %s\n", g_strerror(errno));
return;
}
ares_process(ghba_chan, &rfds, &wfds);
}
}
}
static void
sync_lookup_ip4(const guint32 addr)
{
gboolean completed = FALSE;
sync_dns_data_t *sdd;
if (!async_dns_initialized) {
/*
* c-ares not initialized. Bail out.
*/
return;
}
/*
* Start the request.
*/
sdd = g_new(sync_dns_data_t, 1);
sdd->family = AF_INET;
sdd->addr.ip4 = addr;
sdd->completed = &completed;
ares_gethostbyaddr(ghba_chan, &addr, sizeof(guint32), AF_INET,
c_ares_ghba_sync_cb, sdd);
/*
* Now wait for it to finish.
*/
wait_for_sync_resolv(&completed);
}
static void
sync_lookup_ip6(const ws_in6_addr *addr)
{
gboolean completed = FALSE;
sync_dns_data_t *sdd;
if (!async_dns_initialized) {
/*
* c-ares not initialized. Bail out.
*/
return;
}
/*
* Start the request.
*/
sdd = g_new(sync_dns_data_t, 1);
sdd->family = AF_INET6;
memcpy(&sdd->addr.ip6, addr, sizeof(sdd->addr.ip6));
sdd->completed = &completed;
ares_gethostbyaddr(ghba_chan, &addr, sizeof(ws_in6_addr), AF_INET6,
c_ares_ghba_sync_cb, sdd);
/*
* Now wait for it to finish.
*/
wait_for_sync_resolv(&completed);
}
void
set_resolution_synchrony(gboolean synchronous)
{
resolve_synchronously = synchronous;
maxmind_db_set_synchrony(synchronous);
}
static void
c_ares_set_dns_servers(void)
{
if ((!async_dns_initialized) || (!use_custom_dns_server_list))
return;
if (ndnsservers == 0) {
//clear the list of servers. This may effectively disable name resolution
ares_set_servers(ghba_chan, NULL);
ares_set_servers(ghbn_chan, NULL);
} else {
struct ares_addr_node* servers = wmem_alloc_array(NULL, struct ares_addr_node, ndnsservers);
ws_in4_addr ipv4addr;
ws_in6_addr ipv6addr;
gboolean invalid_IP_found = FALSE;
struct ares_addr_node* server;
guint i;
for (i = 0, server = servers; i < ndnsservers-1; i++, server++) {
if (ws_inet_pton6(dnsserverlist_uats[i].ipaddr, &ipv6addr)) {
server->family = AF_INET6;
memcpy(&server->addr.addr6, &ipv6addr, 16);
} else if (ws_inet_pton4(dnsserverlist_uats[i].ipaddr, &ipv4addr)) {
server->family = AF_INET;
memcpy(&server->addr.addr4, &ipv4addr, 4);
} else {
//This shouldn't happen, but just in case...
invalid_IP_found = TRUE;
server->family = 0;
memset(&server->addr.addr4, 0, 4);
break;
}
server->next = (server+1);
}
if (!invalid_IP_found) {
if (ws_inet_pton6(dnsserverlist_uats[i].ipaddr, &ipv6addr)) {
server->family = AF_INET6;
memcpy(&server->addr.addr6, &ipv6addr, 16);
}
else if (ws_inet_pton4(dnsserverlist_uats[i].ipaddr, &ipv4addr)) {
server->family = AF_INET;
memcpy(&server->addr.addr4, &ipv4addr, 4);
} else {
//This shouldn't happen, but just in case...
server->family = 0;
memset(&server->addr.addr4, 0, 4);
}
}
server->next = NULL;
ares_set_servers(ghba_chan, servers);
ares_set_servers(ghbn_chan, servers);
wmem_free(NULL, servers);
}
}
typedef struct {
guint32 mask;
gsize mask_length;
const gchar* name; /* Shallow copy */
} subnet_entry_t;
/* Maximum supported line length of hosts, services, manuf, etc. */
#define MAX_LINELEN 1024
/** Read a line without trailing (CR)LF. Returns -1 on failure. */
static int
fgetline(char *buf, int size, FILE *fp)
{
if (fgets(buf, size, fp)) {
int len = (int)strcspn(buf, "\r\n");
buf[len] = '\0';
return len;
}
return -1;
} /* fgetline */
/*
* Local function definitions
*/
static subnet_entry_t subnet_lookup(const guint32 addr);
static void subnet_entry_set(guint32 subnet_addr, const guint8 mask_length, const gchar* name);
static void
add_service_name(port_type proto, const guint port, const char *service_name)
{
serv_port_t *serv_port_table;
serv_port_table = (serv_port_t *)wmem_map_lookup(serv_port_hashtable, GUINT_TO_POINTER(port));
if (serv_port_table == NULL) {
serv_port_table = wmem_new0(wmem_epan_scope(), serv_port_t);
wmem_map_insert(serv_port_hashtable, GUINT_TO_POINTER(port), serv_port_table);
}
switch(proto) {
case PT_TCP:
wmem_free(wmem_epan_scope(), serv_port_table->tcp_name);
serv_port_table->tcp_name = wmem_strdup(wmem_epan_scope(), service_name);
break;
case PT_UDP:
wmem_free(wmem_epan_scope(), serv_port_table->udp_name);
serv_port_table->udp_name = wmem_strdup(wmem_epan_scope(), service_name);
break;
case PT_SCTP:
wmem_free(wmem_epan_scope(), serv_port_table->sctp_name);
serv_port_table->sctp_name = wmem_strdup(wmem_epan_scope(), service_name);
break;
case PT_DCCP:
wmem_free(wmem_epan_scope(), serv_port_table->dccp_name);
serv_port_table->dccp_name = wmem_strdup(wmem_epan_scope(), service_name);
break;
default:
return;
/* Should not happen */
}
new_resolved_objects = TRUE;
}
static void
parse_service_line (char *line)
{
gchar *cp;
gchar *service;
gchar *port;
port_type proto;
struct cb_serv_data cb_data;
range_t *port_rng = NULL;
if ((cp = strchr(line, '#')))
*cp = '\0';
if ((cp = strtok(line, " \t")) == NULL)
return;
service = cp;
if ((cp = strtok(NULL, " \t")) == NULL)
return;
port = cp;
if (strtok(cp, "/") == NULL)
return;
if (range_convert_str(NULL, &port_rng, port, G_MAXUINT16) != CVT_NO_ERROR) {
wmem_free (NULL, port_rng);
return;
}
while ((cp = strtok(NULL, "/")) != NULL) {
if (strcmp(cp, "tcp") == 0) {
proto = PT_TCP;
}
else if (strcmp(cp, "udp") == 0) {
proto = PT_UDP;
}
else if (strcmp(cp, "sctp") == 0) {
proto = PT_SCTP;
}
else if (strcmp(cp, "dccp") == 0) {
proto = PT_DCCP;
}
else {
break;
}
cb_data.service = service;
cb_data.proto = proto;
range_foreach(port_rng, add_serv_port_cb, &cb_data);
}
wmem_free (NULL, port_rng);
} /* parse_service_line */
static void
add_serv_port_cb(const guint32 port, gpointer ptr)
{
struct cb_serv_data *cb_data = (struct cb_serv_data *)ptr;
if ( port ) {
add_service_name(cb_data->proto, port, cb_data->service);
}
}
static gboolean
parse_services_file(const char * path)
{
FILE *serv_p;
char buf[MAX_LINELEN];
/* services hash table initialization */
serv_p = ws_fopen(path, "r");
if (serv_p == NULL)
return FALSE;
while (fgetline(buf, sizeof(buf), serv_p) >= 0) {
parse_service_line(buf);
}
fclose(serv_p);
return TRUE;
}
/* -----------------
* unsigned integer to ascii
*/
static gchar *
wmem_utoa(wmem_allocator_t *allocator, guint port)
{
gchar *bp = (gchar *)wmem_alloc(allocator, MAXNAMELEN);
/* XXX, guint32_to_str() ? */
guint32_to_str_buf(port, bp, MAXNAMELEN);
return bp;
}
static const gchar *
_serv_name_lookup(port_type proto, guint port, serv_port_t **value_ret)
{
serv_port_t *serv_port_table;
serv_port_table = (serv_port_t *)wmem_map_lookup(serv_port_hashtable, GUINT_TO_POINTER(port));
if (value_ret != NULL)
*value_ret = serv_port_table;
if (serv_port_table == NULL)
return NULL;
switch (proto) {
case PT_UDP:
return serv_port_table->udp_name;
case PT_TCP:
return serv_port_table->tcp_name;
case PT_SCTP:
return serv_port_table->sctp_name;
case PT_DCCP:
return serv_port_table->dccp_name;
default:
break;
}
return NULL;
}
const gchar *
try_serv_name_lookup(port_type proto, guint port)
{
return _serv_name_lookup(proto, port, NULL);
}
const gchar *
serv_name_lookup(port_type proto, guint port)
{
serv_port_t *serv_port_table = NULL;
const char *name;
name = _serv_name_lookup(proto, port, &serv_port_table);
if (name != NULL)
return name;
if (serv_port_table == NULL) {
serv_port_table = wmem_new0(wmem_epan_scope(), serv_port_t);
wmem_map_insert(serv_port_hashtable, GUINT_TO_POINTER(port), serv_port_table);
}
if (serv_port_table->numeric == NULL) {
serv_port_table->numeric = wmem_strdup_printf(wmem_epan_scope(), "%u", port);
}
return serv_port_table->numeric;
}
static void
initialize_services(void)
{
gboolean parse_file = TRUE;
ws_assert(serv_port_hashtable == NULL);
serv_port_hashtable = wmem_map_new(wmem_epan_scope(), g_direct_hash, g_direct_equal);
/* Compute the pathname of the services file. */
if (g_services_path == NULL) {
g_services_path = get_datafile_path(ENAME_SERVICES);
}
parse_services_file(g_services_path);
/* Compute the pathname of the personal services file */
if (g_pservices_path == NULL) {
/* Check profile directory before personal configuration */
g_pservices_path = get_persconffile_path(ENAME_SERVICES, TRUE);
if (!parse_services_file(g_pservices_path)) {
g_free(g_pservices_path);
g_pservices_path = get_persconffile_path(ENAME_SERVICES, FALSE);
} else {
parse_file = FALSE;
}
}
if (parse_file) {
parse_services_file(g_pservices_path);
}
}
static void
service_name_lookup_cleanup(void)
{
serv_port_hashtable = NULL;
g_free(g_services_path);
g_services_path = NULL;
g_free(g_pservices_path);
g_pservices_path = NULL;
}
static void
parse_enterprises_line (char *line)
{
char *tok, *dec_str, *org_str;
guint32 dec;
gboolean had_comment = FALSE;
/* Stop the line at any comment found */
if ((tok = strchr(line, '#'))) {
*tok = '\0';
had_comment = TRUE;
}
/* Get enterprise number */
dec_str = strtok(line, " \t");
if (!dec_str)
return;
/* Get enterprise name */
org_str = strtok(NULL, ""); /* everything else */
if (org_str && had_comment) {
/* Only need to strip after (between name and where comment was) */
org_str = g_strchomp(org_str);
}
if (!org_str)
return;
/* Add entry using number as key */
if (!ws_strtou32(dec_str, NULL, &dec))
return;
g_hash_table_insert(enterprises_hashtable, GUINT_TO_POINTER(dec), g_strdup(org_str));
}
static gboolean
parse_enterprises_file(const char * path)
{
FILE *fp;
char buf[MAX_LINELEN];
fp = ws_fopen(path, "r");
if (fp == NULL)
return FALSE;
while (fgetline(buf, sizeof(buf), fp) >= 0) {
parse_enterprises_line(buf);
}
fclose(fp);
return TRUE;
}
static void
initialize_enterprises(void)
{
ws_assert(enterprises_hashtable == NULL);
enterprises_hashtable = g_hash_table_new_full(NULL, NULL, NULL, g_free);
if (g_enterprises_path == NULL) {
g_enterprises_path = get_datafile_path(ENAME_ENTERPRISES);
}
parse_enterprises_file(g_enterprises_path);
if (g_penterprises_path == NULL) {
/* Check profile directory before personal configuration */
g_penterprises_path = get_persconffile_path(ENAME_ENTERPRISES, TRUE);
if (!file_exists(g_penterprises_path)) {
g_free(g_penterprises_path);
g_penterprises_path = get_persconffile_path(ENAME_ENTERPRISES, FALSE);
}
}
parse_enterprises_file(g_penterprises_path);
}
const gchar *
try_enterprises_lookup(guint32 value)
{
return (const gchar *)g_hash_table_lookup(enterprises_hashtable, GUINT_TO_POINTER(value));
}
const gchar *
enterprises_lookup(guint32 value, const char *unknown_str)
{
const gchar *s;
s = try_enterprises_lookup(value);
if (s != NULL)
return s;
if (unknown_str != NULL)
return unknown_str;
return "<Unknown>";
}
void
enterprises_base_custom(char *buf, guint32 value)
{
const gchar *s;
if ((s = try_enterprises_lookup(value)) == NULL)
s = ITEM_LABEL_UNKNOWN_STR;
g_snprintf(buf, ITEM_LABEL_LENGTH, "%s (%u)", s, value);
}
static void
enterprises_cleanup(void)
{
ws_assert(enterprises_hashtable);
g_hash_table_destroy(enterprises_hashtable);
enterprises_hashtable = NULL;
ws_assert(g_enterprises_path);
g_free(g_enterprises_path);
g_enterprises_path = NULL;
g_free(g_penterprises_path);
g_penterprises_path = NULL;
g_free(g_pservices_path);
g_pservices_path = NULL;
}
/* Fill in an IP4 structure with info from subnets file or just with the
* string form of the address.
*/
static void
fill_dummy_ip4(const guint addr, hashipv4_t* volatile tp)
{
subnet_entry_t subnet_entry;
/* Overwrite if we get async DNS reply */
/* Do we have a subnet for this address? */
subnet_entry = subnet_lookup(addr);
if (0 != subnet_entry.mask) {
/* Print name, then '.' then IP address after subnet mask */
guint32 host_addr;
gchar buffer[WS_INET_ADDRSTRLEN];
gchar* paddr;
gsize i;
host_addr = addr & (~subnet_entry.mask);
ip_to_str_buf((guint8 *)&host_addr, buffer, WS_INET_ADDRSTRLEN);
paddr = buffer;
/* Skip to first octet that is not totally masked
* If length of mask is 32, we chomp the whole address.
* If the address string starts '.' (should not happen?),
* we skip that '.'.
*/