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#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <stdbool.h>
#include <curl/curl.h>
#include <event2/event.h>
#include <event2/bufferevent.h>
#include <event2/buffer.h>
#define URIS_S 2
const char *uris[] = {
"https://api.turris.cz/updater-defs/3.5/omnia/dev-karel/base.lua",
"https://api.turris.cz/updater-defs/3.5/omnia/dev-karel/base.lua.sig"
};
CURLM *curl_multi;
struct event_base *e_base;
struct event *e_timer;
struct dwn_data {
const char *err;
};
static void check() {
CURLMsg *msg;
int msgs_left;
struct dwn_data *data;
char *url;
while ((msg = curl_multi_info_read(curl_multi, &msgs_left))) {
if (msg->msg != CURLMSG_DONE)
continue; // No other message types are defined in libcurl. We check just because of compatibility with possible future versions.
curl_easy_getinfo(msg->easy_handle, CURLINFO_PRIVATE, &data);
curl_easy_getinfo(msg->easy_handle, CURLINFO_EFFECTIVE_URL, &url);
if (msg->data.result == CURLE_OK) {
printf("Download succesfull (%s)\n", url);
} else {
printf("Download failed (%s): %s\n", url, data->err);
exit(2);
}
}
}
static size_t clb_write(char *ptr, size_t size, size_t nmemb, void *userd) {
// Drop all data
return size * nmemb;
}
static void clb_timer(int fd __attribute__((unused)), short kind __attribute__((unused)), void *userp) {
printf("Timer callback\n");
int running = 0;
curl_multi_socket_action(curl_multi, CURL_SOCKET_TIMEOUT, 0, &running);
check();
}
static int clb_timer_set(CURLM *curl_multi __attribute__((unused)), long timeout_ms, void *userp) {
printf("Timer set %ld\n", timeout_ms);
struct timeval timeout;
timeout.tv_sec = timeout_ms / 1000;
timeout.tv_usec = (timeout_ms % 1000) * 1000;
evtimer_add(e_timer, &timeout);
return 0;
}
struct dt_s {
size_t id;
struct event *e;
};
static void clb_socket(int fd, short kind, void *userp) {
printf("Socket callback\n");
int action = ((kind & EV_READ) ? CURL_CSELECT_IN : 0) | ((kind & EV_WRITE) ? CURL_CSELECT_OUT : 0);
int running = 0;
curl_multi_socket_action(curl_multi, fd, action, &running);
check();
if (running <= 0 && evtimer_pending(e_timer, NULL))
evtimer_del(e_timer);
}
size_t id_next = 0;
static int clb_socket_set(CURL *curl_easy, curl_socket_t s, int what, void *userp, void *socketp) {
struct dt_s *sdata = socketp;
if (what == CURL_POLL_REMOVE) {
printf("Socket remove %ld\n", sdata->id);
event_free(sdata->e);
free(sdata);
} else {
if (!sdata) { // New socket. No data associated.
printf("Socket new %ld\n", id_next);
sdata = malloc(sizeof *sdata);
sdata->e = NULL;
sdata->id = id_next++;
curl_multi_assign(curl_multi, s, sdata);
} else
printf("Socket change %ld\n", sdata->id);
short kind = ((what & CURL_POLL_IN) ? EV_READ : 0) | ((what & CURL_POLL_OUT) ? EV_WRITE : 0) | EV_PERSIST;
if (sdata->e) {
event_del(sdata->e);
event_assign(sdata->e, e_base, s, kind, clb_socket, sdata);
} else
sdata->e = event_new(e_base, s, kind, clb_socket, sdata);
event_add(sdata->e, NULL);
}
return 0;
}
static CURL *new_curl(const char *uri, bool simple) {
CURL *curl = curl_easy_init();
curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
curl_easy_setopt(curl, CURLOPT_URL, uri);
curl_easy_setopt(curl, CURLOPT_ACCEPT_ENCODING, "");
curl_easy_setopt(curl, CURLOPT_CAINFO, "./ca.pem");
curl_easy_setopt(curl, CURLOPT_CRLFILE, "./crl.pem");
curl_easy_setopt(curl, CURLOPT_FAILONERROR, 1);
curl_easy_setopt(curl, CURLOPT_TIMEOUT, 120);
curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 30);
curl_easy_setopt(curl, CURLOPT_CAPATH, NULL);
curl_easy_setopt(curl, CURLOPT_SSL_CIPHER_LIST, NULL);
if (!simple) {
struct dwn_data *data = malloc(sizeof *data);
curl_multi_add_handle(curl_multi, curl);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, clb_write);
curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, data->err);
curl_easy_setopt(curl, CURLOPT_PRIVATE, data);
}
return curl;
}
int main(int argc, char *argv[]) {
bool simple = (argc > 1 && !strcmp(argv[1], "-s"));
bool multi = (argc > 1 && !strcmp(argv[1], "-m"));
curl_global_init(CURL_GLOBAL_SSL);
if (!simple) {
struct event_config *config = event_config_new();
event_config_require_features(config, EV_FEATURE_FDS);
event_config_set_flag(config, EVENT_BASE_FLAG_NOLOCK);
e_base = event_base_new_with_config(config);
event_config_free(config);
e_timer = evtimer_new(e_base, clb_timer, NULL);
curl_multi = curl_multi_init();
curl_multi_setopt(curl_multi, CURLMOPT_MAX_TOTAL_CONNECTIONS, 1);
curl_multi_setopt(curl_multi, CURLMOPT_SOCKETFUNCTION, clb_socket_set);
curl_multi_setopt(curl_multi, CURLMOPT_TIMERFUNCTION, clb_timer_set);
}
size_t i;
CURL *curls[URIS_S];
for (i = 0; i < URIS_S; i++) {
curls[i] = new_curl(uris[i], simple);
}
if (simple) {
for (i = 0; i < URIS_S; i++) {
CURLcode res = curl_easy_perform(curls[i]);
if (res == CURLE_OK)
printf("Download succesfull (%s)\n", uris[i]);
else
printf("Download failed (%s): %s\n", uris[i], curl_easy_strerror(res));
}
} else if (multi) {
int sr = 0;
CURLMcode cd;
do {
cd = curl_multi_perform(curl_multi, &sr);
} while(sr > 0 || cd == CURLM_CALL_MULTI_PERFORM);
if (cd != CURLM_OK) {
printf("Download failed: %s\n", curl_multi_strerror(cd));
exit(3);
} else
printf("Download succesfull\n");
} else
event_base_dispatch(e_base);
for (i = 0; i < URIS_S; i++) {
if (!simple)
curl_multi_remove_handle(curl_multi, curls[i]);
curl_easy_cleanup(curls[i]);
}
if (!simple) {
curl_multi_cleanup(curl_multi);
event_free(e_timer);
event_base_free(e_base);
}
curl_global_cleanup();
return 0;
}
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