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httpdirfs/src/network.c

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#include "network.h"
#include "cache.h"
#include "config.h"
#include <openssl/crypto.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
/* ----------------- External variables ---------------------- */
CURLSH *CURL_SHARE;
/* ----------------- Static variable ----------------------- */
/** \brief curl multi interface handle */
static CURLM *curl_multi;
/** \brief mutex for transfer functions */
static pthread_mutex_t transfer_lock;
/** \brief the lock array for cryptographic functions */
static pthread_mutex_t *crypto_lockarray;
/** \brief mutex for curl share interface itself */
static pthread_mutex_t curl_lock;
/* -------------------- Functions -------------------------- */
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-function"
/**
* \brief OpenSSL 1.02 cryptography callback function
* \details Required for OpenSSL 1.02, but not OpenSSL 1.1
*/
static void crypto_lock_callback(int mode, int type, char *file, int line)
{
(void) file;
(void) line;
if (mode & CRYPTO_LOCK) {
PTHREAD_MUTEX_LOCK(&(crypto_lockarray[type]));
} else {
PTHREAD_MUTEX_UNLOCK(&(crypto_lockarray[type]));
}
}
/**
* \brief OpenSSL 1.02 thread ID function
* \details Required for OpenSSL 1.02, but not OpenSSL 1.1
*/
static unsigned long thread_id(void)
{
unsigned long ret;
ret = (unsigned long)pthread_self();
return ret;
}
#pragma GCC diagnostic pop
static void crypto_lock_init(void)
{
int i;
crypto_lockarray = (pthread_mutex_t *)OPENSSL_malloc(CRYPTO_num_locks() *
sizeof(pthread_mutex_t));
for(i = 0; i<CRYPTO_num_locks(); i++) {
pthread_mutex_init(&(crypto_lockarray[i]), NULL);
}
CRYPTO_set_id_callback((unsigned long (*)())thread_id);
CRYPTO_set_locking_callback((void (*)())crypto_lock_callback);
}
/**
* \brief Curl share handle callback function
* \details Adapted from:
* https://curl.haxx.se/libcurl/c/threaded-shared-conn.html
*/
static void curl_callback_lock(CURL *handle, curl_lock_data data,
curl_lock_access access, void *userptr)
{
(void)access; /* unused */
(void)userptr; /* unused */
(void)handle; /* unused */
(void)data; /* unused */
PTHREAD_MUTEX_LOCK(&curl_lock);
}
static void curl_callback_unlock(CURL *handle, curl_lock_data data,
void *userptr)
{
(void)userptr; /* unused */
(void)handle; /* unused */
(void)data; /* unused */
PTHREAD_MUTEX_UNLOCK(&curl_lock);
}
/**
* \brief Process a curl message
* \details Adapted from:
* https://curl.haxx.se/libcurl/c/10-at-a-time.html
*/
static void curl_process_msgs(CURLMsg *curl_msg, int n_running_curl,
int n_mesgs)
{
(void) n_running_curl;
(void) n_mesgs;
static volatile int slept = 0;
if (curl_msg->msg == CURLMSG_DONE) {
TransferStruct *transfer;
CURL *curl = curl_msg->easy_handle;
curl_easy_getinfo(curl_msg->easy_handle, CURLINFO_PRIVATE,
&transfer);
transfer->transferring = 0;
char *url = NULL;
curl_easy_getinfo(curl, CURLINFO_EFFECTIVE_URL, &url);
/* Wait for 5 seconds if we get HTTP 429 */
long http_resp = 0;
curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &http_resp);
if (HTTP_temp_failure(http_resp)) {
if (!slept) {
fprintf(stderr,
"curl_process_msgs(): HTTP %ld, sleeping for %d sec\n",
http_resp, CONFIG.http_wait_sec);
sleep(CONFIG.http_wait_sec);
slept = 1;
}
} else {
slept = 0;
}
if (!curl_msg->data.result) {
/* Transfer successful, set the file size */
if (transfer->type == FILESTAT) {
Link_set_file_stat(transfer->link, curl);
}
} else {
fprintf(stderr, "curl_process_msgs(): %d - %s <%s>\n",
curl_msg->data.result,
curl_easy_strerror(curl_msg->data.result),
url);
}
curl_multi_remove_handle(curl_multi, curl);
/* clean up the handle, if we are querying the file size */
if (transfer->type == FILESTAT) {
curl_easy_cleanup(curl);
free(transfer);
}
} else {
fprintf(stderr, "curl_process_msgs(): curl_msg->msg: %d\n",
curl_msg->msg);
}
}
/**
* \details effectively based on
* https://curl.haxx.se/libcurl/c/multi-double.html
*/
int curl_multi_perform_once(void)
{
#ifdef NETWORK_LOCK_DEBUG
fprintf(stderr,
"curl_multi_perform_once(): thread %lu: locking transfer_lock;\n",
pthread_self());
#endif
PTHREAD_MUTEX_LOCK(&transfer_lock);
/* Get curl multi interface to perform pending tasks */
int n_running_curl;
CURLMcode mc = curl_multi_perform(curl_multi, &n_running_curl);
if(mc > 0) {
fprintf(stderr, "curl_multi_perform(): %s\n", curl_multi_strerror(mc));
}
fd_set fdread;
fd_set fdwrite;
fd_set fdexcep;
int maxfd = -1;
long curl_timeo = -1;
FD_ZERO(&fdread);
FD_ZERO(&fdwrite);
FD_ZERO(&fdexcep);
/* set a default timeout for select() */
struct timeval timeout;
timeout.tv_sec = 1;
timeout.tv_usec = 0;
curl_multi_timeout(curl_multi, &curl_timeo);
/* We effectively cap timeout to 1 sec */
if (curl_timeo >= 0) {
timeout.tv_sec = curl_timeo / 1000;
if (timeout.tv_sec > 1) {
timeout.tv_sec = 1;
} else {
timeout.tv_usec = (curl_timeo % 1000) * 1000;
}
}
/* get file descriptors from the transfers */
mc = curl_multi_fdset(curl_multi, &fdread, &fdwrite, &fdexcep, &maxfd);
if (mc > 0) {
fprintf(stderr, "curl_multi_fdset(): %s.\n", curl_multi_strerror(mc));
}
if (maxfd == -1) {
usleep(100*1000);
} else {
if (select(maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout) < 0) {
fprintf(stderr, "curl_multi_perform_once(): select(): %s.\n",
strerror(errno));
}
}
/* Process the message queue */
int n_mesgs;
CURLMsg *curl_msg;
while((curl_msg = curl_multi_info_read(curl_multi, &n_mesgs))) {
curl_process_msgs(curl_msg, n_running_curl, n_mesgs);
}
#ifdef NETWORK_LOCK_DEBUG
fprintf(stderr,
"curl_multi_perform_once(): thread %lu: unlocking transfer_lock;\n",
pthread_self());
#endif
PTHREAD_MUTEX_UNLOCK(&transfer_lock);
return n_running_curl;
}
void NetworkSystem_init(void)
{
/* ------- Global related ----------*/
if (curl_global_init(CURL_GLOBAL_ALL)) {
fprintf(stderr, "network_init(): curl_global_init() failed!\n");
exit_failure();
}
/* -------- Share related ----------*/
CURL_SHARE = curl_share_init();
if (!(CURL_SHARE)) {
fprintf(stderr, "network_init(): curl_share_init() failed!\n");
exit_failure();
}
curl_share_setopt(CURL_SHARE, CURLSHOPT_SHARE, CURL_LOCK_DATA_COOKIE);
curl_share_setopt(CURL_SHARE, CURLSHOPT_SHARE, CURL_LOCK_DATA_DNS);
curl_share_setopt(CURL_SHARE, CURLSHOPT_SHARE, CURL_LOCK_DATA_SSL_SESSION);
if (pthread_mutex_init(&curl_lock, NULL) != 0) {
fprintf(stderr, "network_init(): curl_lock initialisation failed!\n");
exit_failure();
}
curl_share_setopt(CURL_SHARE, CURLSHOPT_LOCKFUNC, curl_callback_lock);
curl_share_setopt(CURL_SHARE, CURLSHOPT_UNLOCKFUNC, curl_callback_unlock);
/* ------------- Multi related -----------*/
curl_multi = curl_multi_init();
if (!curl_multi) {
fprintf(stderr, "network_init(): curl_multi_init() failed!\n");
exit_failure();
}
curl_multi_setopt(curl_multi, CURLMOPT_MAX_TOTAL_CONNECTIONS,
CONFIG.max_conns);
curl_multi_setopt(curl_multi, CURLMOPT_MAX_HOST_CONNECTIONS,
CONFIG.max_conns);
/* ------------ Initialise locks ---------*/
if (pthread_mutex_init(&transfer_lock, NULL)) {
fprintf(stderr,
"network_init(): transfer_lock initialisation failed!\n");
exit_failure();
}
/*
* cryptographic lock functions were shamelessly copied from
* https://curl.haxx.se/libcurl/c/threaded-ssl.html
*/
crypto_lock_init();
}
void transfer_blocking(CURL *curl)
{
/*
* We don't need to malloc here, as the transfer is finished before
* the variable gets popped from the stack
*/
volatile TransferStruct transfer;
transfer.type = DATA;
transfer.transferring = 1;
curl_easy_setopt(curl, CURLOPT_PRIVATE, &transfer);
#ifdef NETWORK_LOCK_DEBUG
fprintf(stderr,
"transfer_blocking(): thread %lu: locking transfer_lock;\n",
pthread_self());
#endif
PTHREAD_MUTEX_LOCK(&transfer_lock);
CURLMcode res = curl_multi_add_handle(curl_multi, curl);
#ifdef NETWORK_LOCK_DEBUG
fprintf(stderr,
"transfer_blocking(): thread %lu: unlocking transfer_lock;\n",
pthread_self());
#endif
PTHREAD_MUTEX_UNLOCK(&transfer_lock);
if(res > 0) {
fprintf(stderr, "transfer_blocking(): %d, %s\n",
res, curl_multi_strerror(res));
exit_failure();
}
while (transfer.transferring) {
curl_multi_perform_once();
}
}
void transfer_nonblocking(CURL *curl)
{
#ifdef NETWORK_LOCK_DEBUG
fprintf(stderr,
"transfer_nonblocking(): thread %lu: locking transfer_lock;\n",
pthread_self());
#endif
PTHREAD_MUTEX_LOCK(&transfer_lock);
CURLMcode res = curl_multi_add_handle(curl_multi, curl);
#ifdef NETWORK_LOCK_DEBUG
fprintf(stderr,
"transfer_nonblocking(): thread %lu: unlocking transfer_lock;\n",
pthread_self());
#endif
PTHREAD_MUTEX_UNLOCK(&transfer_lock);
if(res > 0) {
fprintf(stderr, "transfer_nonblocking(): %s\n",
curl_multi_strerror(res));
}
}
size_t write_memory_callback(void *contents, size_t size, size_t nmemb,
void *userp)
{
size_t realsize = size * nmemb;
DataStruct *mem = (DataStruct *)userp;
mem->data = realloc(mem->data, mem->size + realsize + 1);
if(!mem->data) {
/* out of memory! */
fprintf(stderr, "write_memory_callback(): realloc failure!\n");
exit_failure();
return 0;
}
memmove(&mem->data[mem->size], contents, realsize);
mem->size += realsize;
mem->data[mem->size] = 0;
return realsize;
}
int HTTP_temp_failure(HTTPResponseCode http_resp)
{
switch (http_resp) {
case HTTP_TOO_MANY_REQUESTS:
case HTTP_CLOUDFLARE_UNKNOWN_ERROR:
case HTTP_CLOUDFLARE_TIMEOUT:
return 1;
default:
return 0;
}
}
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