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#include "libmmbackend.h"
#define LOGPF(format, ...) fprintf(stderr, "libmmbe\t" format "\n", __VA_ARGS__)
#define LOG(message) fprintf(stderr, "libmmbe\t%s\n", (message))
#ifndef _WIN32
#define closesocket close
#endif
int mmbackend_strdup(char** dest, char* src){
if(*dest){
free(*dest);
}
*dest = strdup(src);
if(!*dest){
LOG("Failed to allocate memory");
return 1;
}
return 0;
}
char* mmbackend_socket_strerror(int err_no){
#ifdef _WIN32
static char error[2048] = "";
ssize_t u;
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, WSAGetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), error, sizeof(error), NULL);
//remove trailing newline that for some reason is included in most of these...
for(u = strlen(error) - 1; u > 0; u--){
if(!isprint(error[u])){
error[u] = 0;
}
}
return error;
#else
return strerror(err_no);
#endif
}
const char* mmbackend_sockaddr_ntop(struct sockaddr* peer, char* buffer, size_t length){
union {
struct sockaddr* in;
struct sockaddr_in* in4;
struct sockaddr_in6* in6;
} addr;
addr.in = peer;
#ifdef _WIN32
uint8_t* data = NULL;
#endif
switch(addr.in->sa_family){
//inet_ntop has become available in the winapi with vista, but eh.
#ifdef _WIN32
case AF_INET6:
data = addr.in6->sin6_addr.s6_addr;
snprintf(buffer, length, "%02X%02X:%02X%02X:%02X%02X:%02X%02X:%02X%02X:%02X%02X:%02X%02X:%02X%02X",
data[0], data[1], data[2], data[3],
data[4], data[5], data[6], data[7],
data[8], data[9], data[10], data[11],
data[12], data[13], data[14], data[15]);
return buffer;
case AF_INET:
data = (uint8_t*) &(addr.in4->sin_addr.s_addr);
snprintf(buffer, length, "%d.%d.%d.%d", data[0], data[1], data[2], data[3]);
return buffer;
#else
case AF_INET6:
return inet_ntop(addr.in->sa_family, &(addr.in6->sin6_addr), buffer, length);
case AF_INET:
return inet_ntop(addr.in->sa_family, &(addr.in4->sin_addr), buffer, length);
#endif
default:
snprintf(buffer, length, "Socket family not implemented");
return buffer;
}
}
void mmbackend_parse_hostspec(char* spec, char** host, char** port, char** options){
size_t u = 0;
if(!spec || !host || !port){
return;
}
*port = NULL;
//skip leading spaces
for(; spec[u] && isspace(spec[u]); u++){
}
if(!spec[u]){
*host = NULL;
return;
}
*host = spec + u;
//scan until string end or space
for(; spec[u] && !isspace(spec[u]); u++){
}
//if space, the rest should be the port
if(spec[u]){
spec[u] = 0;
*port = spec + u + 1;
}
if(options){
*options = NULL;
if(*port){
//scan for space after port
for(u = 0; (*port)[u] && !isspace((*port)[u]); u++){
}
if(isspace((*port)[u])){
(*port)[u] = 0;
*options = (*port) + u + 1;
}
}
}
}
int mmbackend_parse_sockaddr(char* host, char* port, struct sockaddr_storage* addr, socklen_t* len){
struct addrinfo* head;
struct addrinfo hints = {
.ai_family = AF_UNSPEC
};
int error = getaddrinfo(host, port, &hints, &head);
if(error || !head){
LOGPF("Failed to parse address %s port %s: %s", host, port, gai_strerror(error));
return 1;
}
memcpy(addr, head->ai_addr, head->ai_addrlen);
if(len){
*len = head->ai_addrlen;
}
freeaddrinfo(head);
return 0;
}
int mmbackend_socket(char* host, char* port, int socktype, uint8_t listener, uint8_t mcast, uint8_t dualstack){
int fd = -1, status, yes = 1;
struct addrinfo hints = {
.ai_family = AF_UNSPEC,
.ai_socktype = socktype,
.ai_flags = (listener ? AI_PASSIVE : 0)
};
struct addrinfo *info, *addr_it;
status = getaddrinfo(host, port, &hints, &info);
if(status){
LOGPF("Failed to parse address %s port %s: %s", host, port, gai_strerror(status));
return -1;
}
//traverse the result list
for(addr_it = info; addr_it; addr_it = addr_it->ai_next){
fd = socket(addr_it->ai_family, addr_it->ai_socktype, addr_it->ai_protocol);
if(fd < 0){
continue;
}
//set required socket options
yes = 1;
if(setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (void*) &yes, sizeof(yes)) < 0){
LOGPF("Failed to enable SO_REUSEADDR on socket: %s", mmbackend_socket_strerror(errno));
}
yes = dualstack ? 0 : 1;
if(addr_it->ai_family == AF_INET6 && setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, (void*) &yes, sizeof(yes)) < 0){
LOGPF("Failed to %s dualstack operations on socket: %s", dualstack ? "enable" : "disable", mmbackend_socket_strerror(errno));
}
if(mcast){
yes = 1;
if(setsockopt(fd, SOL_SOCKET, SO_BROADCAST, (void*) &yes, sizeof(yes)) < 0){
LOGPF("Failed to enable SO_BROADCAST on socket: %s", mmbackend_socket_strerror(errno));
}
yes = 0;
if(setsockopt(fd, addr_it->ai_family == AF_INET ? IPPROTO_IP : IPPROTO_IPV6, addr_it->ai_family == AF_INET ? IP_MULTICAST_LOOP : IPV6_MULTICAST_LOOP, (void*) &yes, sizeof(yes)) < 0){
LOGPF("Failed to disable IP_MULTICAST_LOOP on socket: %s", mmbackend_socket_strerror(errno));
}
}
if(listener){
status = bind(fd, addr_it->ai_addr, addr_it->ai_addrlen);
if(status < 0){
closesocket(fd);
continue;
}
}
else{
status = connect(fd, addr_it->ai_addr, addr_it->ai_addrlen);
if(status < 0){
closesocket(fd);
continue;
}
}
break;
}
freeaddrinfo(info);
if(!addr_it){
LOGPF("Failed to create socket for %s port %s", host, port);
return -1;
}
//set nonblocking
#ifdef _WIN32
u_long mode = 1;
if(ioctlsocket(fd, FIONBIO, &mode) != NO_ERROR){
closesocket(fd);
return 1;
}
#else
int flags = fcntl(fd, F_GETFL, 0);
if(fcntl(fd, F_SETFL, flags | O_NONBLOCK) < 0){
LOGPF("Failed to set socket nonblocking: %s", mmbackend_socket_strerror(errno));
close(fd);
return -1;
}
#endif
return fd;
}
int mmbackend_send(int fd, uint8_t* data, size_t length){
ssize_t total = 0, sent;
while(total < length){
#ifndef LIBMMBACKEND_TCP_TORTURE
sent = send(fd, data + total, length - total, 0);
#else
sent = send(fd, data + total, 1, 0);
#endif
if(sent < 0){
LOGPF("Failed to send: %s", mmbackend_socket_strerror(errno));
return 1;
}
total += sent;
}
return 0;
}
int mmbackend_send_str(int fd, char* data){
return mmbackend_send(fd, (uint8_t*) data, strlen(data));
}
json_type json_identify(char* json, size_t length){
size_t n;
//skip leading blanks
for(n = 0; json[n] && n < length && isspace(json[n]); n++){
}
if(n == length){
return JSON_INVALID;
}
switch(json[n]){
case '{':
return JSON_OBJECT;
case '[':
return JSON_ARRAY;
case '"':
return JSON_STRING;
case '-':
case '+':
return JSON_NUMBER;
default:
//true false null number
if(!strncmp(json + n, "true", 4)
|| !strncmp(json + n, "false", 5)){
return JSON_BOOL;
}
else if(!strncmp(json + n, "null", 4)){
return JSON_NULL;
}
//a bit simplistic but it should do
if(isdigit(json[n])){
return JSON_NUMBER;
}
}
return JSON_INVALID;
}
size_t json_validate(char* json, size_t length){
switch(json_identify(json, length)){
case JSON_STRING:
return json_validate_string(json, length);
case JSON_ARRAY:
return json_validate_array(json, length);
case JSON_OBJECT:
return json_validate_object(json, length);
case JSON_INVALID:
return 0;
default:
return json_validate_value(json, length);
}
}
size_t json_validate_string(char* json, size_t length){
size_t string_length = 0, offset;
//skip leading whitespace
for(offset = 0; json[offset] && offset < length && isspace(json[offset]); offset++){
}
if(offset == length || json[offset] != '"'){
return 0;
}
//find terminating quotation mark not preceded by escape
for(string_length = 1; offset + string_length < length
&& isprint(json[offset + string_length])
&& (json[offset + string_length] != '"' || json[offset + string_length - 1] == '\\'); string_length++){
}
//complete string found
if(json[offset + string_length] == '"' && json[offset + string_length - 1] != '\\'){
return offset + string_length + 1;
}
return 0;
}
size_t json_validate_array(char* json, size_t length){
size_t offset = 0;
//skip leading whitespace
for(offset = 0; json[offset] && offset < length && isspace(json[offset]); offset++){
}
if(offset == length || json[offset] != '['){
return 0;
}
for(offset++; offset < length; offset++){
offset += json_validate(json + offset, length - offset);
//skip trailing whitespace, find terminator
for(; offset < length && isspace(json[offset]); offset++){
}
if(json[offset] == ','){
continue;
}
if(json[offset] == ']'){
return offset + 1;
}
break;
}
return 0;
}
size_t json_validate_object(char* json, size_t length){
size_t offset = 0;
//skip whitespace
for(offset = 0; json[offset] && isspace(json[offset]); offset++){
}
if(offset == length || json[offset] != '{'){
return 0;
}
for(offset++; offset < length; offset++){
if(json_identify(json + offset, length - offset) != JSON_STRING){
//still could be an empty object...
for(; offset < length && isspace(json[offset]); offset++){
}
if(json[offset] == '}'){
return offset + 1;
}
return 0;
}
offset += json_validate(json + offset, length - offset);
//find value separator
for(; offset < length && isspace(json[offset]); offset++){
}
if(json[offset] != ':'){
return 0;
}
offset++;
offset += json_validate(json + offset, length - offset);
//skip trailing whitespace
for(; json[offset] && isspace(json[offset]); offset++){
}
if(json[offset] == '}'){
return offset + 1;
}
else if(json[offset] != ','){
return 0;
}
}
return 0;
}
size_t json_validate_value(char* json, size_t length){
size_t offset = 0, value_length;
//skip leading whitespace
for(offset = 0; json[offset] && offset < length && isspace(json[offset]); offset++){
}
if(offset == length){
return 0;
}
//match complete values
if(length - offset >= 4 && !strncmp(json + offset, "null", 4)){
return offset + 4;
}
else if(length - offset >= 4 && !strncmp(json + offset, "true", 4)){
return offset + 4;
}
else if(length - offset >= 5 && !strncmp(json + offset, "false", 5)){
return offset + 5;
}
if(json[offset] == '-' || isdigit(json[offset])){
//json number parsing is dumb.
for(value_length = 1; offset + value_length < length &&
(isdigit(json[offset + value_length])
|| json[offset + value_length] == '+'
|| json[offset + value_length] == '-'
|| json[offset + value_length] == '.'
|| tolower(json[offset + value_length]) == 'e'); value_length++){
}
if(value_length > 0){
return offset + value_length;
}
}
return 0;
}
size_t json_obj_offset(char* json, char* key){
size_t offset = 0;
uint8_t match = 0;
//skip whitespace
for(offset = 0; json[offset] && isspace(json[offset]); offset++){
}
if(json[offset] != '{'){
return 0;
}
offset++;
while(json_identify(json + offset, strlen(json + offset)) == JSON_STRING){
//skip to key begin
for(; json[offset] && json[offset] != '"'; offset++){
}
if(!strncmp(json + offset + 1, key, strlen(key)) && json[offset + 1 + strlen(key)] == '"'){
//key found
match = 1;
}
offset += json_validate_string(json + offset, strlen(json + offset));
//skip to value separator
for(; json[offset] && json[offset] != ':'; offset++){
}
//skip whitespace
for(offset++; json[offset] && isspace(json[offset]); offset++){
}
if(match){
return offset;
}
//add length of value
offset += json_validate(json + offset, strlen(json + offset));
//skip trailing whitespace
for(; json[offset] && isspace(json[offset]); offset++){
}
if(json[offset] == ','){
offset++;
continue;
}
break;
}
return 0;
}
size_t json_array_offset(char* json, uint64_t key){
size_t offset = 0, index = 0;
//skip leading whitespace
for(offset = 0; json[offset] && isspace(json[offset]); offset++){
}
if(json[offset] != '['){
return 0;
}
for(offset++; index <= key; offset++){
//skip whitespace
for(; json[offset] && isspace(json[offset]); offset++){
}
if(index == key){
return offset;
}
offset += json_validate(json + offset, strlen(json + offset));
//skip trailing whitespace, find terminator
for(; json[offset] && isspace(json[offset]); offset++){
}
if(json[offset] != ','){
break;
}
index++;
}
return 0;
}
json_type json_obj(char* json, char* key){
size_t offset = json_obj_offset(json, key);
if(offset){
return json_identify(json + offset, strlen(json + offset));
}
return JSON_INVALID;
}
json_type json_array(char* json, uint64_t key){
size_t offset = json_array_offset(json, key);
if(offset){
return json_identify(json + offset, strlen(json + offset));
}
return JSON_INVALID;
}
uint8_t json_obj_bool(char* json, char* key, uint8_t fallback){
size_t offset = json_obj_offset(json, key);
if(offset){
if(!strncmp(json + offset, "true", 4)){
return 1;
}
if(!strncmp(json + offset, "false", 5)){
return 0;
}
}
return fallback;
}
uint8_t json_array_bool(char* json, uint64_t key, uint8_t fallback){
size_t offset = json_array_offset(json, key);
if(offset){
if(!strncmp(json + offset, "true", 4)){
return 1;
}
if(!strncmp(json + offset, "false", 5)){
return 0;
}
}
return fallback;
}
int64_t json_obj_int(char* json, char* key, int64_t fallback){
char* next_token = NULL;
int64_t result;
size_t offset = json_obj_offset(json, key);
if(offset){
result = strtol(json + offset, &next_token, 10);
if(next_token != json + offset){
return result;
}
}
return fallback;
}
double json_obj_double(char* json, char* key, double fallback){
char* next_token = NULL;
double result;
size_t offset = json_obj_offset(json, key);
if(offset){
result = strtod(json + offset, &next_token);
if(next_token != json + offset){
return result;
}
}
return fallback;
}
int64_t json_array_int(char* json, uint64_t key, int64_t fallback){
char* next_token = NULL;
int64_t result;
size_t offset = json_array_offset(json, key);
if(offset){
result = strtol(json + offset, &next_token, 10);
if(next_token != json + offset){
return result;
}
}
return fallback;
}
double json_array_double(char* json, uint64_t key, double fallback){
char* next_token = NULL;
double result;
size_t offset = json_array_offset(json, key);
if(offset){
result = strtod(json + offset, &next_token);
if(next_token != json + offset){
return result;
}
}
return fallback;
}
char* json_obj_str(char* json, char* key, size_t* length){
size_t offset = json_obj_offset(json, key), raw_length;
if(offset){
raw_length = json_validate_string(json + offset, strlen(json + offset));
if(length){
*length = raw_length - 2;
}
return json + offset + 1;
}
return NULL;
}
char* json_obj_strdup(char* json, char* key){
size_t len = 0;
char* value = json_obj_str(json, key, &len), *rv = NULL;
if(len){
rv = calloc(len + 1, sizeof(char));
if(rv){
memcpy(rv, value, len);
}
}
return rv;
}
char* json_array_str(char* json, uint64_t key, size_t* length){
size_t offset = json_array_offset(json, key), raw_length;
if(offset){
raw_length = json_validate_string(json + offset, strlen(json + offset));
if(length){
*length = raw_length - 2;
}
return json + offset + 1;
}
return NULL;
}
char* json_array_strdup(char* json, uint64_t key){
size_t len = 0;
char* value = json_array_str(json, key, &len), *rv = NULL;
if(len){
rv = calloc(len + 1, sizeof(char));
if(rv){
memcpy(rv, value, len);
}
}
return rv;
}
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