http2-serverpush.c [plain text]
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <unistd.h>
#include <curl/curl.h>
#ifndef CURLPIPE_MULTIPLEX
#error "too old libcurl, can't do HTTP/2 server push!"
#endif
static
void dump(const char *text, unsigned char *ptr, size_t size,
char nohex)
{
size_t i;
size_t c;
unsigned int width=0x10;
if(nohex)
width = 0x40;
fprintf(stderr, "%s, %ld bytes (0x%lx)\n",
text, (long)size, (long)size);
for(i=0; i<size; i+= width) {
fprintf(stderr, "%4.4lx: ", (long)i);
if(!nohex) {
for(c = 0; c < width; c++)
if(i+c < size)
fprintf(stderr, "%02x ", ptr[i+c]);
else
fputs(" ", stderr);
}
for(c = 0; (c < width) && (i+c < size); c++) {
if(nohex && (i+c+1 < size) && ptr[i+c]==0x0D && ptr[i+c+1]==0x0A) {
i+=(c+2-width);
break;
}
fprintf(stderr, "%c",
(ptr[i+c]>=0x20) && (ptr[i+c]<0x80)?ptr[i+c]:'.');
if(nohex && (i+c+2 < size) && ptr[i+c+1]==0x0D && ptr[i+c+2]==0x0A) {
i+=(c+3-width);
break;
}
}
fputc('\n', stderr);
}
}
static
int my_trace(CURL *handle, curl_infotype type,
char *data, size_t size,
void *userp)
{
const char *text;
(void)handle;
(void)userp;
switch(type) {
case CURLINFO_TEXT:
fprintf(stderr, "== Info: %s", data);
default:
return 0;
case CURLINFO_HEADER_OUT:
text = "=> Send header";
break;
case CURLINFO_DATA_OUT:
text = "=> Send data";
break;
case CURLINFO_SSL_DATA_OUT:
text = "=> Send SSL data";
break;
case CURLINFO_HEADER_IN:
text = "<= Recv header";
break;
case CURLINFO_DATA_IN:
text = "<= Recv data";
break;
case CURLINFO_SSL_DATA_IN:
text = "<= Recv SSL data";
break;
}
dump(text, (unsigned char *)data, size, 1);
return 0;
}
#define OUTPUTFILE "dl"
static void setup(CURL *hnd)
{
FILE *out = fopen(OUTPUTFILE, "wb");
curl_easy_setopt(hnd, CURLOPT_WRITEDATA, out);
curl_easy_setopt(hnd, CURLOPT_URL, "https://localhost:8443/index.html");
curl_easy_setopt(hnd, CURLOPT_VERBOSE, 1L);
curl_easy_setopt(hnd, CURLOPT_DEBUGFUNCTION, my_trace);
curl_easy_setopt(hnd, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0);
curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYPEER, 0L);
curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYHOST, 0L);
#if (CURLPIPE_MULTIPLEX > 0)
curl_easy_setopt(hnd, CURLOPT_PIPEWAIT, 1L);
#endif
}
static int server_push_callback(CURL *parent,
CURL *easy,
size_t num_headers,
struct curl_pushheaders *headers,
void *userp)
{
char *headp;
size_t i;
int *transfers = (int *)userp;
char filename[128];
FILE *out;
static unsigned int count = 0;
(void)parent;
snprintf(filename, 128, "push%u", count++);
out = fopen(filename, "wb");
curl_easy_setopt(easy, CURLOPT_WRITEDATA, out);
fprintf(stderr, "**** push callback approves stream %u, got %d headers!\n",
count, (int)num_headers);
for(i=0; i<num_headers; i++) {
headp = curl_pushheader_bynum(headers, i);
fprintf(stderr, "**** header %u: %s\n", (int)i, headp);
}
headp = curl_pushheader_byname(headers, ":path");
if(headp) {
fprintf(stderr, "**** The PATH is %s\n", headp );
}
(*transfers)++;
return CURL_PUSH_OK;
}
int main(void)
{
CURL *easy;
CURLM *multi_handle;
int still_running;
int transfers=1;
struct CURLMsg *m;
multi_handle = curl_multi_init();
easy = curl_easy_init();
setup(easy);
curl_multi_add_handle(multi_handle, easy);
curl_multi_setopt(multi_handle, CURLMOPT_PIPELINING, CURLPIPE_MULTIPLEX);
curl_multi_setopt(multi_handle, CURLMOPT_PUSHFUNCTION, server_push_callback);
curl_multi_setopt(multi_handle, CURLMOPT_PUSHDATA, &transfers);
curl_multi_perform(multi_handle, &still_running);
do {
struct timeval timeout;
int rc;
CURLMcode 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);
timeout.tv_sec = 1;
timeout.tv_usec = 0;
curl_multi_timeout(multi_handle, &curl_timeo);
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;
}
mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
if(mc != CURLM_OK) {
fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc);
break;
}
if(maxfd == -1) {
#ifdef _WIN32
Sleep(100);
rc = 0;
#else
struct timeval wait = { 0, 100 * 1000 };
rc = select(0, NULL, NULL, NULL, &wait);
#endif
}
else {
rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
}
switch(rc) {
case -1:
break;
case 0:
default:
curl_multi_perform(multi_handle, &still_running);
break;
}
do {
int msgq = 0;;
m = curl_multi_info_read(multi_handle, &msgq);
if(m && (m->msg == CURLMSG_DONE)) {
CURL *e = m->easy_handle;
transfers--;
curl_multi_remove_handle(multi_handle, e);
curl_easy_cleanup(e);
}
} while(m);
} while(transfers);
curl_multi_cleanup(multi_handle);
return 0;
}