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gth_apilib.c
1661 lines (1324 loc) · 36.5 KB
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gth_apilib.c
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//----------------------------------------------------------------------
// API routines for talking to a Corelatus GTH.
//
// If you are already familiar with the GTH API, then looking at gth_apilib.h
// and some of the examples, e.g. record.c, is one way to get started.
//
// If you aren't familiar with the GTH API, see www.corelatus.com/gth/api/
//
// Documentation for this module is in the header file (gth_apilib.h)
//
// Author: Matt Lang (matthias@corelatus.se)
//
// Copyright (c) 2013, 2009, Corelatus AB Stockholm
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * 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.
// * Neither the name of Corelatus nor the
// names of its contributors may be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY Corelatus ''AS IS'' AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL Corelatus BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
//----------------------------------------------------------------------
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <errno.h>
#include <string.h>
#include <assert.h>
#ifdef WIN32
#include <winsock2.h>
typedef int socklen_t;
#else
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#endif // WIN32
#include "gth_win32_compat.h"
#include "gth_apilib.h"
#include "gth_client_xml_parse.h"
#define MAX_COMMAND 10000
#define MAX_RESPONSE 10000
#define MAX_LOGFILE 20000000
const int GTH_API_PORT = 2089; // TCP port a Corelatus GTH listens on
//----------------------------------------------------------------------
// Forward declarations.
static int read_header_line(int fd, char *line);
static int definite_read(int fd,
int length,
char *response,
const int max_response_length);
static GTH_resp *gth_next_non_event(GTH_api *api);
static void string_write(int s, const char* string);
static char *attribute_value(const GTH_resp *resp, const char *key);
static char *attribute_value_and_clear(GTH_resp *resp, const char *key);
static int query_single_resource(GTH_api *api,
const char *name,
GTH_attribute **attributes,
int *n_attributes);
static int query_inventory(GTH_api *api,
GTH_attribute **attributes,
int *n_attributes);
static void my_ip_address(GTH_api *api);
static int recv_job_id(GTH_api *api, char *id);
static void api_write(GTH_api *api, const char* command);
static void api_write_non_xml(int s,
const char* type,
const char* data,
int len);
// Read the next GTH response from the given API connection.
//
// The response is written to the caller-provided response buffer,
// truncated to response_length, including the zero termination.
//
// Return: 0 on success, anything else is an error
//
static int next_api_response(GTH_api *api,
char* response,
const int max_response_length);
// Use the XML parser to parse the next response
//
// Return 0 if the response was as expected
//
// If the response is not as expected and **actual is non-null,
// the actual response is left in **actual. The caller must then free it.
//
static int check_api_response(GTH_api *api, GTH_resp_type expected,
GTH_resp **actual);
//----------------------------------------------------------------------
void die(const char* message)
{
fprintf(stderr, "%s\n", message);
exit(-1);
}
void gth_event_handler(void *data, GTH_resp *resp)
{
GTH_resp *child;
GTH_api *api = data;
assert(api);
assert(resp);
assert(resp->type == GTH_RESP_EVENT);
assert(resp->n_children == 1);
child = resp->children + 0;
switch (child->type) {
case GTH_RESP_INFO: {
const char *reason = attribute_value(child, "reason");
if (!strcmp(reason, "failsafe_mode")) {
api->is_failsafe = 1;
} else {
fprintf(stderr, "Ignoring an <info> with reason=%s\n", reason);
}
break;
}
case GTH_RESP_L1_MESSAGE: {
gth_print_tree(resp);
break;
}
case GTH_RESP_SYNC_MESSAGE: {
gth_print_tree(resp);
break;
}
case GTH_RESP_TONE:
if (api->tone_handler) {
const char *name = attribute_value(child, "name");
const char *length = attribute_value(child, "length");
api->tone_handler(name, atoi(length));
break;
}
// no handler -> fall through to printing the tone event
default:
fprintf(stderr,
"gth_event_handler got an event, handling with default handler\n");
gth_print_tree(resp);
break;
}
// do not free the resp, it's not yours to free. (handlers may be chained)
}
int gth_connect(GTH_api *api, const char *address, const int verbose)
{
struct sockaddr_in gth_addr;
struct hostent* host;
assert(api);
api->is_failsafe = 0;
api->print_cmds = verbose;
api->print_responses = verbose;
api->event_handler = >h_event_handler;
api->tone_handler = 0;
host = gethostbyname(address);
if (host == 0) {
return -ENETUNREACH;
}
if (host->h_addr_list[0] == 0) {
return -ENETUNREACH;
}
gth_addr.sin_family = AF_INET;
gth_addr.sin_port = htons(GTH_API_PORT);
memcpy(>h_addr.sin_addr, host->h_addr_list[0], host->h_length);
api->fd = socket(PF_INET, SOCK_STREAM, 0);
if (api->fd < 0) {
return -ENOTSOCK;
}
if (connect(api->fd, (struct sockaddr *)>h_addr, sizeof(gth_addr))) {
// On *nix, errno tells us why the connect failed.
// On Win32, you have to call some WSA function.
return -1;
}
my_ip_address(api);
return 0;
}
// Helper for simple commands.
static int single_arg_ok_response(GTH_api *api,
const char *template,
const char *arg)
{
char buffer[MAX_COMMAND];
assert(api);
assert(template);
assert(arg);
snprintf(buffer, MAX_COMMAND, template, arg);
api_write(api, buffer);
if (check_api_response(api, GTH_RESP_OK, 0)) {
return -1;
}
return 0;
}
int gth_bye(GTH_api *api)
{
return single_arg_ok_response(api, "<bye/>%s", "");
}
int gth_make_listen_socket(int* port)
{
int s = -1;
int result;
struct sockaddr_in addr;
socklen_t addr_size = sizeof addr;
addr.sin_family = AF_INET;
addr.sin_port = 0;
addr.sin_addr.s_addr = INADDR_ANY;
s = socket(PF_INET, SOCK_STREAM, 0);
assert(s >= 0);
result = bind(s, (struct sockaddr*)&addr, sizeof addr);
assert(result == 0);
result = listen(s, 1);
assert(result == 0);
result = getsockname(s, (struct sockaddr*)&addr, &addr_size);
assert(result == 0);
assert(addr_size == sizeof addr);
*port = ntohs(addr.sin_port);
return s;
}
int gth_make_udp_socket(int* port)
{
int s = -1;
int result;
struct sockaddr_in addr;
socklen_t addr_size = sizeof addr;
addr.sin_family = AF_INET;
addr.sin_port = 0;
addr.sin_addr.s_addr = INADDR_ANY;
s = socket(PF_INET, SOCK_DGRAM, 0);
assert(s >= 0);
result = bind(s, (struct sockaddr*)&addr, sizeof addr);
assert(result == 0);
result = getsockname(s, (struct sockaddr*)&addr, &addr_size);
assert(result == 0);
assert(addr_size == sizeof addr);
*port = ntohs(addr.sin_port);
return s;
}
int gth_wait_for_accept(int listen_socket)
{
int data_socket = -1;
data_socket = accept(listen_socket, 0, 0);
if (data_socket < 0) {
die("unable to accept socket (possibly blocked by a firewall)");
}
return data_socket;
}
// Return 1 if the given resp is an 'install_done' event, 0 otherwise.
static int is_install_done_event(GTH_resp *resp)
{
GTH_resp *child;
if (resp->type != GTH_RESP_EVENT)
return 0;
assert(resp->n_children == 1);
child = resp->children + 0;
if (child->type == GTH_RESP_INFO) {
if (!strcmp("install_done", attribute_value(child, "reason"))) {
return 1;
}
}
return 0;
}
// Return: 0 on success
static int gth_wait_for_install_complete(GTH_api *api, int need_install_done)
{
char buffer[MAX_COMMAND];
int result;
GTH_resp *resp = 0;
int looking_for_ok = 1;
int looking_for_install_done = need_install_done;
assert(api);
for (;;) {
result = next_api_response(api, buffer, sizeof(buffer));
if (result != 0) {
return -1;
}
resp = gth_parse(buffer);
if (resp == 0) {
return -1;
}
if (is_install_done_event(resp))
looking_for_install_done = 0;
else
{
assert(api->event_handler);
if (resp->type == GTH_RESP_EVENT)
(*api->event_handler)(api, resp);
else if (resp->type == GTH_RESP_OK)
looking_for_ok = 0;
else
{
gth_print_tree(resp);
gth_free_resp(resp);
return -1;
}
}
gth_free_resp(resp);
if (!looking_for_install_done && !looking_for_ok)
return 0;
}
return 0;
}
static int kv_to_tags(char *buffer,
const size_t buflen,
const GTH_attribute *attributes,
int n)
{
int used = 0;
*buffer = 0;
while (attributes && n > 0) {
used += snprintf(buffer + used, buflen - used,
"<attribute name='%s' value='%s'/>",
attributes->key, attributes->value);
n--;
attributes++;
}
return used;
}
static int kv_to_attributes(char *buffer,
const size_t buflen,
const GTH_attribute *attributes,
int n)
{
int used = 0;
*buffer = 0;
while (attributes && n > 0) {
used += snprintf(buffer + used, buflen - used,
" %s='%s'",
attributes->key, attributes->value);
n--;
attributes++;
}
return used;
}
// Internal; used by both gth_enable and gth_set
static int gth_enable_or_set(const char *command,
GTH_api *api,
const char *resource,
const GTH_attribute *attributes,
int n_attributes)
{
char buffer[MAX_COMMAND];
int used;
assert(api);
assert(resource);
used = snprintf(buffer, MAX_COMMAND, "<%s name='%s'>", command, resource);
used += kv_to_tags(buffer + used, MAX_COMMAND - used,
attributes, n_attributes);
used += snprintf(buffer + used, MAX_COMMAND - used, "</%s>", command);
api_write(api, buffer);
if (check_api_response(api, GTH_RESP_OK, 0)) {
return -1;
}
return 0;
}
int gth_disable(GTH_api *api,
const char *resource)
{
return single_arg_ok_response(api, "<disable name='%s'/>", resource);
}
int gth_enable(GTH_api *api,
const char *resource,
const GTH_attribute *attributes,
int n_attributes)
{
return gth_enable_or_set("enable", api, resource, attributes, n_attributes);
}
int gth_install(GTH_api *api,
const char *name,
const char *type,
const char *data,
const int length)
{
char buffer[MAX_COMMAND];
int result;
int is_firmware_install = !strcmp(type, "binary/filesystem");
assert(api);
snprintf(buffer, MAX_COMMAND, "<install name='%s'/>", name);
api_write(api, buffer);
api_write_non_xml(api->fd, type, data, length);
result = gth_wait_for_install_complete(api, is_firmware_install);
return result;
}
int gth_new_cas_r2_mfc_detector(GTH_api *api,
const int tag,
const char *span,
int timeslot, // E1: 1--31 T1: 1--24
char *job_id, // function writes to job-id
const char* ip,
const int port)
{
int result;
char command[MAX_COMMAND];
const char* command_template =
"<new><cas_r2_mfc_detector tag='%d' direction='forward' "
"ip_addr='%s' ip_port='%d'><pcm_source span='%s' timeslot='%d'/>"
"</cas_r2_mfc_detector></new>";
snprintf(command, MAX_COMMAND, command_template,
tag, ip, port, span, timeslot);
api_write(api, command);
result = recv_job_id(api, job_id);
return result;
}
int gth_new_cas_r2_linesig_monitor(GTH_api *api,
const int tag,
const char *span,
const int ts,
char *job_id,
const char* ip,
const int port)
{
int result;
char command[MAX_COMMAND];
const char* command_template =
"<new><cas_r2_linesig_monitor tag='%d' "
"ip_addr='%s' ip_port='%d'><pcm_source span='%s' timeslot='%d'/>"
"</cas_r2_linesig_monitor></new>";
snprintf(command, MAX_COMMAND, command_template, tag, ip, port, span, ts);
api_write(api, command);
result = recv_job_id(api, job_id);
return result;
}
int gth_new_connection(GTH_api *api,
const char *src_span,
const int src_ts,
const char *dst_span,
const int dst_ts,
char *job_id)
{
int result;
char command[MAX_COMMAND];
const char* command_template =
"<new><connection>"
"<pcm_source span='%s' timeslot='%d'/>"
"<pcm_sink span='%s' timeslot='%d'/>"
"</connection></new>";
snprintf(command, MAX_COMMAND, command_template, src_span, src_ts,
dst_span, dst_ts);
api_write(api, command);
result = recv_job_id(api, job_id);
return result;
}
int gth_new_lapd_layer(GTH_api *api,
const int tag,
const char *span,
const int ts,
const char *side, // either "network" or "user"
const int sapi,
const int tei,
char *job_id,
const char *ip,
const int port)
{
char command[MAX_COMMAND];
int result;
const char* template;
assert(ts > 0 && ts < 32);
assert(!strcmp("network", side) || !strcmp("user", side));
template = "<new><lapd_layer side='%s' sapi='%d' tei='%d' ip_addr='%s' ip_port='%d' tag='%d'>"
"<pcm_source span='%s' timeslot='%d'/>"
"<pcm_sink span='%s' timeslot='%d'/>"
"</lapd_layer></new>";
result = snprintf(command, MAX_COMMAND, template, side, sapi,
tei, ip, port, tag, span, ts, span, ts);
assert(result < MAX_COMMAND);
api_write(api, command);
result = recv_job_id(api, job_id);
return result;
}
int gth_new_lapd_monitor(GTH_api *api,
const int tag,
const char *span,
const int ts,
char *job_id,
const char *ip,
const int port)
{
char command[MAX_COMMAND];
int result;
const char* template;
assert(ts > 0 && ts < 32);
template = "<new><lapd_monitor ip_addr='%s' ip_port='%d' tag='%d'>"
"<pcm_source span='%s' timeslot='%d'/>"
"</lapd_monitor></new>";
result = snprintf(command, MAX_COMMAND, template, ip, port, tag, span, ts);
assert(result < MAX_COMMAND);
api_write(api, command);
result = recv_job_id(api, job_id);
return result;
}
int gth_new_mtp2_monitor(GTH_api *api,
const int tag,
const char *span,
const int ts,
char *job_id,
const char *ip,
const int port)
{
return gth_new_mtp2_monitor_opt(api, tag, span, ts, job_id, ip, port, 0, 0);
}
int gth_new_mtp2_monitor_opt(GTH_api *api,
const int tag,
const char *span,
const int ts,
char *job_id,
const char *ip,
const int port,
const GTH_attribute *options,
const int n_options)
{
char command[MAX_COMMAND];
char attributes[MAX_COMMAND];
int result;
const char* template;
assert(ts > 0 && ts < 32);
result = kv_to_attributes(attributes, MAX_COMMAND, options, n_options);
template = "<new><mtp2_monitor %s ip_addr='%s' ip_port='%d' tag='%d'>"
"<pcm_source span='%s' timeslot='%d'/>"
"</mtp2_monitor></new>";
result = snprintf(command, MAX_COMMAND, template,
attributes, ip, port, tag, span, ts);
assert(result < MAX_COMMAND);
api_write(api, command);
result = recv_job_id(api, job_id);
return result;
}
int gth_new_player(GTH_api *api,
const char *span,
int timeslot,
char *job_id)
{
int listen_port = 0;
int listen_socket = gth_make_listen_socket(&listen_port);
int data_socket;
char command[MAX_COMMAND];
int result;
const char* template;
assert(api);
assert(span);
assert(job_id);
assert(timeslot > 0 && timeslot < 32);
template = "<new><player><tcp_source ip_addr='%s' ip_port='%d'/>"
"<pcm_sink span='%s' timeslot='%d'/></player></new>";
result = snprintf(command, MAX_COMMAND, template,
api->my_ip, listen_port, span, timeslot);
assert(result < MAX_COMMAND);
api_write(api, command);
result = recv_job_id(api, job_id);
if (result == 0) {
data_socket = gth_wait_for_accept(listen_socket);
}
closesocket(listen_socket);
return (result == 0)?data_socket:-1;
}
int gth_new_recorder(GTH_api *api,
const char *span,
int timeslot,
char *job_id)
{
int listen_port = 0;
int listen_socket = gth_make_listen_socket(&listen_port);
int data_socket;
char command[MAX_COMMAND];
int result;
const char* template;
assert(api);
assert(span);
assert(timeslot > 0 && timeslot < 32);
assert(job_id);
template = "<new><recorder><pcm_source span='%s' timeslot='%d'/>"
"<tcp_sink ip_addr='%s' ip_port='%d'/>"
"</recorder></new>";
result = snprintf(command, MAX_COMMAND, template,
span, timeslot, api->my_ip, listen_port);
assert(result < MAX_COMMAND);
api_write(api, command);
result = recv_job_id(api, job_id);
if (result == 0) {
data_socket = gth_wait_for_accept(listen_socket);
}
closesocket(listen_socket);
return (result == 0)?data_socket:-1;
}
int gth_new_tone_detector(GTH_api *api,
const char *span,
int timeslot,
char *job_id,
GTH_tone_handler* handler)
{
const char *template;
int result;
char command[MAX_COMMAND];
template = "<new><tone_detector><pcm_source span='%s' timeslot='%d'/>"
"</tone_detector></new>";
result = snprintf(command, MAX_COMMAND, template, span, timeslot);
assert(result < MAX_COMMAND);
api_write(api, command);
result = recv_job_id(api, job_id);
if (result == 0) {
api->tone_handler = handler;
}
return result;
}
void gth_nop(GTH_api *api)
{
GTH_resp *resp;
api_write(api, "<nop/>");
resp = gth_next_non_event(api);
if (!resp || resp->type != GTH_RESP_OK) {
die("nop failed. Aborting.");
}
gth_free_resp(resp);
}
int gth_new_wide_recorder(GTH_api *api,
const char *span,
char *job_id)
{
int portno = 0;
int data_socket = gth_make_udp_socket(&portno);
char command[MAX_COMMAND];
int result;
const char* template;
assert(api);
assert(span);
assert(job_id);
template = "<new><wide_recorder span='%s'>"
"<udp_sink ip_addr='%s' ip_port='%d'/>"
"</wide_recorder></new>";
result = snprintf(command, MAX_COMMAND, template,
span, api->my_ip, portno);
assert(result < MAX_COMMAND);
api_write(api, command);
result = recv_job_id(api, job_id);
if (result != 0) {
closesocket(data_socket);
}
return (result == 0)?data_socket:-1;
}
// We're expecting a <message_ended> event, wait for it.
// Any other messages which arrive go to the normal event handler.
int gth_wait_for_message_ended(GTH_api *api, const char *job_id)
{
char buffer[MAX_COMMAND];
int result;
GTH_resp *resp = 0;
assert(api);
assert(job_id);
for (;;) {
GTH_resp *child;
const char *event_job_id;
result = next_api_response(api, buffer, sizeof(buffer));
if (result != 0) {
return 0;
}
resp = gth_parse(buffer);
assert(resp);
assert(resp->type == GTH_RESP_EVENT);
assert(resp->n_children == 1);
child = resp->children + 0;
if (child->type == GTH_RESP_MESSAGE_ENDED) {
event_job_id = attribute_value(child, "id");
if (!strcmp(event_job_id, job_id)) {
gth_free_resp(resp);
return 0;
}
}
assert(api->event_handler);
(*api->event_handler)(api, resp);
gth_free_resp(resp);
}
return 0;
}
// There's a job ID coming back on the command socket. Parse it.
//
// Return: 0 on success (and the id in *id, possibly truncated)
static int recv_job_id(GTH_api *api, char *id)
{
GTH_resp *resp;
const char *id_attr;
int result = 0;
assert(api);
assert(id);
resp = gth_next_non_event(api);
if (resp == 0) return -1;
if (resp->type == GTH_RESP_JOB)
{
id_attr = attribute_value(resp, "id");
assert(id_attr && strlen(id_attr) < MAX_JOB_ID);
strcpy(id, id_attr);
}
else
{
result = -2;
}
gth_free_resp(resp);
return result;
}
// 80 characters is guaranteed to be enough for both header lines
#define GTH_HEADER_BUFFER_LEN 80
// Read a header line. A header line is always terminated by \r\n, though
// we only check for \r here.
static int read_header_line(int fd, char *line) {
int used = 0;
int result;
do {
result = recv(fd, line + used, 1, 0);
used++;
if (used >= GTH_HEADER_BUFFER_LEN || result != 1) {
return -1;
}
} while (line[used-1] != '\r');
line[used-1] = 0;
// eat up the \n
result = recv(fd, line + used, 1, 0);
if (result != 1) {
return -1;
}
return 0;
}
//----------------------------------------------------------------------
// Read exactly 'length' bytes from the given fd
//
// Store 'max_response_length' - 1 of the bytes in the 'response' buffer,
// which is null-terminated
//
// Return: 0 on success
//
static int definite_read(int fd,
int length,
char *response,
const int max_response_length)
{
size_t to_read;
int result;
to_read = length;
if (max_response_length <= length) {
to_read = max_response_length - 1;
}
length -= to_read;
while (to_read > 0) {
result = recv(fd, response, to_read, 0);
if (result <= 0) {
closesocket(fd);
return -9;
}
response += result;
to_read -= result;
}
*response = 0;
if (length == 0) {
return 0;
}
while (length > 0) {
char internal_buffer[4000];
to_read = length;
if (to_read > sizeof(internal_buffer)) {
to_read = sizeof(internal_buffer);
}
result = recv(fd, internal_buffer, to_read, 0);
length -= to_read;
}
return -10;
}
//----------------------------------------------------------------------
static int next_api_response(GTH_api *api,
char *response,
const int max_response_length)
{
char content_type[GTH_HEADER_BUFFER_LEN];
char content_length[GTH_HEADER_BUFFER_LEN];
char type[GTH_HEADER_BUFFER_LEN];
int length;
int result1;
int result2;
assert(api);
assert(response);
result1 = read_header_line(api->fd, content_type);
result2 = read_header_line(api->fd, content_length);
if (result1 != 0 || result2 != 0) {
closesocket(api->fd);
api->fd = -1;
return -1;
}
result1 = sscanf(content_type, "Content-type: %s", type);
result2 = sscanf(content_length, "Content-length: %d", &length);
if (result1 != 1 || result2 != 1) {
closesocket(api->fd);
api->fd = -1;
return -2;
}
if (strcmp(type, "text/xml") != 0
&& strcmp(type, "text/plain") != 0) {
closesocket(api->fd);
api->fd = -1;
return -3;
}
// flush the blank line
result1 = read_header_line(api->fd, content_type);