| /* |
| * lws-minimal-http-client |
| * |
| * Copyright (C) 2018 Andy Green <andy@warmcat.com> |
| * |
| * This file is made available under the Creative Commons CC0 1.0 |
| * Universal Public Domain Dedication. |
| * |
| * This demonstrates the a minimal http client using lws. |
| * |
| * It visits https://warmcat.com/ and receives the html page there. You |
| * can dump the page data by changing the #if 0 below. |
| */ |
| |
| #include <libwebsockets.h> |
| #include <string.h> |
| #include <signal.h> |
| |
| static int interrupted; |
| static struct lws *client_wsi; |
| |
| static int |
| callback_http(struct lws *wsi, enum lws_callback_reasons reason, |
| void *user, void *in, size_t len) |
| { |
| switch (reason) { |
| |
| /* because we are protocols[0] ... */ |
| case LWS_CALLBACK_CLIENT_CONNECTION_ERROR: |
| lwsl_err("CLIENT_CONNECTION_ERROR: %s\n", |
| in ? (char *)in : "(null)"); |
| client_wsi = NULL; |
| break; |
| |
| /* chunks of chunked content, with header removed */ |
| case LWS_CALLBACK_RECEIVE_CLIENT_HTTP_READ: |
| lwsl_user("RECEIVE_CLIENT_HTTP_READ: read %d\n", (int)len); |
| #if 0 /* enable to dump the html */ |
| { |
| const char *p = in; |
| |
| while (len--) |
| if (*p < 0x7f) |
| putchar(*p++); |
| else |
| putchar('.'); |
| } |
| #endif |
| return 0; /* don't passthru */ |
| |
| /* uninterpreted http content */ |
| case LWS_CALLBACK_RECEIVE_CLIENT_HTTP: |
| { |
| char buffer[1024 + LWS_PRE]; |
| char *px = buffer + LWS_PRE; |
| int lenx = sizeof(buffer) - LWS_PRE; |
| |
| if (lws_http_client_read(wsi, &px, &lenx) < 0) |
| return -1; |
| } |
| return 0; /* don't passthru */ |
| |
| case LWS_CALLBACK_COMPLETED_CLIENT_HTTP: |
| client_wsi = NULL; |
| break; |
| |
| default: |
| break; |
| } |
| |
| return lws_callback_http_dummy(wsi, reason, user, in, len); |
| } |
| |
| static const struct lws_protocols protocols[] = { |
| { |
| "http", |
| callback_http, |
| 0, |
| 0, |
| }, |
| { NULL, NULL, 0, 0 } |
| }; |
| |
| static void |
| sigint_handler(int sig) |
| { |
| interrupted = 1; |
| } |
| |
| int main(int argc, char **argv) |
| { |
| struct lws_context_creation_info info; |
| struct lws_client_connect_info i; |
| struct lws_context *context; |
| int n = 0; |
| |
| signal(SIGINT, sigint_handler); |
| lws_set_log_level(LLL_ERR | LLL_WARN | LLL_NOTICE | LLL_USER |
| /* | LLL_INFO */ /* | LLL_DEBUG */, NULL); |
| lwsl_user("LWS minimal http client\n"); |
| |
| memset(&info, 0, sizeof info); /* otherwise uninitialized garbage */ |
| info.options = LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT; |
| info.port = CONTEXT_PORT_NO_LISTEN; /* we do not run any server */ |
| info.protocols = protocols; |
| |
| context = lws_create_context(&info); |
| if (!context) { |
| lwsl_err("lws init failed\n"); |
| return 1; |
| } |
| |
| memset(&i, 0, sizeof i); /* otherwise uninitialized garbage */ |
| i.context = context; |
| |
| i.port = 443; |
| i.address = "warmcat.com"; |
| i.path = "/"; |
| i.host = i.address; |
| i.origin = i.address; |
| i.ssl_connection = 1; |
| i.method = "GET"; |
| |
| i.protocol = protocols[0].name; |
| i.pwsi = &client_wsi; |
| lws_client_connect_via_info(&i); |
| |
| while (n >= 0 && client_wsi && !interrupted) |
| n = lws_service(context, 1000); |
| |
| lws_context_destroy(context); |
| lwsl_user("Completed\n"); |
| |
| return 0; |
| } |