#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/time.h>
#include <time.h>
#include <unistd.h>
#include <sys/poll.h>
#include <curl/curl.h>
#include <event2/event.h>
#include <event2/event_struct.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <errno.h>
#include <sys/cdefs.h>
#ifdef __GNUC__
#define _Unused __attribute__((unused))
#else
#define _Unused
#endif
#define MSG_OUT stdout
typedef struct _GlobalInfo
{
struct event_base *evbase;
struct event fifo_event;
struct event timer_event;
CURLM *multi;
int still_running;
FILE *input;
int stopped;
} GlobalInfo;
typedef struct _ConnInfo
{
CURL *easy;
char *url;
GlobalInfo *global;
char error[CURL_ERROR_SIZE];
} ConnInfo;
typedef struct _SockInfo
{
curl_socket_t sockfd;
CURL *easy;
int action;
long timeout;
struct event ev;
GlobalInfo *global;
} SockInfo;
#define __case(code) \
case code: s = __STRING(code)
static void mcode_or_die(const char *where, CURLMcode code)
{
if(CURLM_OK != code) {
const char *s;
switch(code) {
__case(CURLM_BAD_HANDLE); break;
__case(CURLM_BAD_EASY_HANDLE); break;
__case(CURLM_OUT_OF_MEMORY); break;
__case(CURLM_INTERNAL_ERROR); break;
__case(CURLM_UNKNOWN_OPTION); break;
__case(CURLM_LAST); break;
default: s = "CURLM_unknown"; break;
__case(CURLM_BAD_SOCKET);
fprintf(MSG_OUT, "ERROR: %s returns %s\n", where, s);
return;
}
fprintf(MSG_OUT, "ERROR: %s returns %s\n", where, s);
exit(code);
}
}
static int multi_timer_cb(CURLM *multi _Unused, long timeout_ms, GlobalInfo *g)
{
struct timeval timeout;
CURLMcode rc;
timeout.tv_sec = timeout_ms/1000;
timeout.tv_usec = (timeout_ms%1000)*1000;
fprintf(MSG_OUT, "multi_timer_cb: Setting timeout to %ld ms\n", timeout_ms);
if(timeout_ms == -1)
evtimer_del(&g->timer_event);
else
evtimer_add(&g->timer_event, &timeout);
return 0;
}
static void check_multi_info(GlobalInfo *g)
{
char *eff_url;
CURLMsg *msg;
int msgs_left;
ConnInfo *conn;
CURL *easy;
CURLcode res;
fprintf(MSG_OUT, "REMAINING: %d\n", g->still_running);
while((msg = curl_multi_info_read(g->multi, &msgs_left))) {
if(msg->msg == CURLMSG_DONE) {
easy = msg->easy_handle;
res = msg->data.result;
curl_easy_getinfo(easy, CURLINFO_PRIVATE, &conn);
curl_easy_getinfo(easy, CURLINFO_EFFECTIVE_URL, &eff_url);
fprintf(MSG_OUT, "DONE: %s => (%d) %s\n", eff_url, res, conn->error);
curl_multi_remove_handle(g->multi, easy);
free(conn->url);
curl_easy_cleanup(easy);
free(conn);
}
}
if(g->still_running == 0 && g->stopped)
event_base_loopbreak(g->evbase);
}
static void event_cb(int fd, short kind, void *userp)
{
GlobalInfo *g = (GlobalInfo*) userp;
CURLMcode rc;
int action =
(kind & EV_READ ? CURL_CSELECT_IN : 0) |
(kind & EV_WRITE ? CURL_CSELECT_OUT : 0);
rc = curl_multi_socket_action(g->multi, fd, action, &g->still_running);
mcode_or_die("event_cb: curl_multi_socket_action", rc);
check_multi_info(g);
if(g->still_running <= 0) {
fprintf(MSG_OUT, "last transfer done, kill timeout\n");
if(evtimer_pending(&g->timer_event, NULL)) {
evtimer_del(&g->timer_event);
}
}
}
static void timer_cb(int fd _Unused, short kind _Unused, void *userp)
{
GlobalInfo *g = (GlobalInfo *)userp;
CURLMcode rc;
rc = curl_multi_socket_action(g->multi,
CURL_SOCKET_TIMEOUT, 0, &g->still_running);
mcode_or_die("timer_cb: curl_multi_socket_action", rc);
check_multi_info(g);
}
static void remsock(SockInfo *f)
{
if(f) {
event_del(&f->ev);
free(f);
}
}
static void setsock(SockInfo *f, curl_socket_t s, CURL *e, int act,
GlobalInfo *g)
{
int kind =
(act&CURL_POLL_IN?EV_READ:0)|(act&CURL_POLL_OUT?EV_WRITE:0)|EV_PERSIST;
f->sockfd = s;
f->action = act;
f->easy = e;
event_del(&f->ev);
event_assign(&f->ev, g->evbase, f->sockfd, kind, event_cb, g);
event_add(&f->ev, NULL);
}
static void addsock(curl_socket_t s, CURL *easy, int action, GlobalInfo *g)
{
SockInfo *fdp = calloc(sizeof(SockInfo), 1);
fdp->global = g;
setsock(fdp, s, easy, action, g);
curl_multi_assign(g->multi, s, fdp);
}
static int sock_cb(CURL *e, curl_socket_t s, int what, void *cbp, void *sockp)
{
GlobalInfo *g = (GlobalInfo*) cbp;
SockInfo *fdp = (SockInfo*) sockp;
const char *whatstr[]={ "none", "IN", "OUT", "INOUT", "REMOVE" };
fprintf(MSG_OUT,
"socket callback: s=%d e=%p what=%s ", s, e, whatstr[what]);
if(what == CURL_POLL_REMOVE) {
fprintf(MSG_OUT, "\n");
remsock(fdp);
}
else {
if(!fdp) {
fprintf(MSG_OUT, "Adding data: %s\n", whatstr[what]);
addsock(s, e, what, g);
}
else {
fprintf(MSG_OUT,
"Changing action from %s to %s\n",
whatstr[fdp->action], whatstr[what]);
setsock(fdp, s, e, what, g);
}
}
return 0;
}
static size_t write_cb(void *ptr _Unused, size_t size, size_t nmemb,
void *data)
{
size_t realsize = size * nmemb;
ConnInfo *conn _Unused = (ConnInfo*) data;
return realsize;
}
static int prog_cb(void *p, double dltotal, double dlnow, double ult _Unused,
double uln _Unused)
{
ConnInfo *conn = (ConnInfo *)p;
fprintf(MSG_OUT, "Progress: %s (%g/%g)\n", conn->url, dlnow, dltotal);
return 0;
}
static void new_conn(char *url, GlobalInfo *g)
{
ConnInfo *conn;
CURLMcode rc;
conn = calloc(1, sizeof(ConnInfo));
conn->error[0]='\0';
conn->easy = curl_easy_init();
if(!conn->easy) {
fprintf(MSG_OUT, "curl_easy_init() failed, exiting!\n");
exit(2);
}
conn->global = g;
conn->url = strdup(url);
curl_easy_setopt(conn->easy, CURLOPT_URL, conn->url);
curl_easy_setopt(conn->easy, CURLOPT_WRITEFUNCTION, write_cb);
curl_easy_setopt(conn->easy, CURLOPT_WRITEDATA, conn);
curl_easy_setopt(conn->easy, CURLOPT_VERBOSE, 1L);
curl_easy_setopt(conn->easy, CURLOPT_ERRORBUFFER, conn->error);
curl_easy_setopt(conn->easy, CURLOPT_PRIVATE, conn);
curl_easy_setopt(conn->easy, CURLOPT_NOPROGRESS, 0L);
curl_easy_setopt(conn->easy, CURLOPT_PROGRESSFUNCTION, prog_cb);
curl_easy_setopt(conn->easy, CURLOPT_PROGRESSDATA, conn);
curl_easy_setopt(conn->easy, CURLOPT_FOLLOWLOCATION, 1L);
fprintf(MSG_OUT,
"Adding easy %p to multi %p (%s)\n", conn->easy, g->multi, url);
rc = curl_multi_add_handle(g->multi, conn->easy);
mcode_or_die("new_conn: curl_multi_add_handle", rc);
}
static void fifo_cb(int fd _Unused, short event _Unused, void *arg)
{
char s[1024];
long int rv = 0;
int n = 0;
GlobalInfo *g = (GlobalInfo *)arg;
do {
s[0]='\0';
rv = fscanf(g->input, "%1023s%n", s, &n);
s[n]='\0';
if(n && s[0]) {
if(!strcmp(s, "stop")) {
g->stopped = 1;
if(g->still_running == 0)
event_base_loopbreak(g->evbase);
}
else
new_conn(s, arg);
}
else
break;
} while(rv != EOF);
}
static const char *fifo = "hiper.fifo";
static int init_fifo(GlobalInfo *g)
{
struct stat st;
curl_socket_t sockfd;
fprintf(MSG_OUT, "Creating named pipe \"%s\"\n", fifo);
if(lstat (fifo, &st) == 0) {
if((st.st_mode & S_IFMT) == S_IFREG) {
errno = EEXIST;
perror("lstat");
exit(1);
}
}
unlink(fifo);
if(mkfifo (fifo, 0600) == -1) {
perror("mkfifo");
exit(1);
}
sockfd = open(fifo, O_RDWR | O_NONBLOCK, 0);
if(sockfd == -1) {
perror("open");
exit(1);
}
g->input = fdopen(sockfd, "r");
fprintf(MSG_OUT, "Now, pipe some URL's into > %s\n", fifo);
event_assign(&g->fifo_event, g->evbase, sockfd, EV_READ|EV_PERSIST,
fifo_cb, g);
event_add(&g->fifo_event, NULL);
return (0);
}
static void clean_fifo(GlobalInfo *g)
{
event_del(&g->fifo_event);
fclose(g->input);
unlink(fifo);
}
int main(int argc _Unused, char **argv _Unused)
{
GlobalInfo g;
memset(&g, 0, sizeof(GlobalInfo));
g.evbase = event_base_new();
init_fifo(&g);
g.multi = curl_multi_init();
evtimer_assign(&g.timer_event, g.evbase, timer_cb, &g);
curl_multi_setopt(g.multi, CURLMOPT_SOCKETFUNCTION, sock_cb);
curl_multi_setopt(g.multi, CURLMOPT_SOCKETDATA, &g);
curl_multi_setopt(g.multi, CURLMOPT_TIMERFUNCTION, multi_timer_cb);
curl_multi_setopt(g.multi, CURLMOPT_TIMERDATA, &g);
event_base_dispatch(g.evbase);
clean_fifo(&g);
event_del(&g.timer_event);
event_base_free(g.evbase);
curl_multi_cleanup(g.multi);
return 0;
}