diff --git a/minimal-examples/http-client/README.md b/minimal-examples/http-client/README.md index 99c652be..ac86f444 100644 --- a/minimal-examples/http-client/README.md +++ b/minimal-examples/http-client/README.md @@ -2,4 +2,5 @@ ---|--- minimal-http-client-hugeurl|Sends a > 2.5KB URL to warmcat.com minimal-http-client-multi|Connects to and reads https://warmcat.com, 8 times concurrently +minimal-http-client-post|POSTs a form containing an uploaded file and a form variable, and captures the response minimal-http-client|Connects to and reads https://warmcat.com diff --git a/minimal-examples/http-client/minimal-http-client-post/CMakeLists.txt b/minimal-examples/http-client/minimal-http-client-post/CMakeLists.txt new file mode 100644 index 00000000..889f5f75 --- /dev/null +++ b/minimal-examples/http-client/minimal-http-client-post/CMakeLists.txt @@ -0,0 +1,77 @@ +cmake_minimum_required(VERSION 2.8) +include(CheckCSourceCompiles) + +set(SAMP lws-minimal-http-client-post) +set(SRCS minimal-http-client-post.c) + +# If we are being built as part of lws, confirm current build config supports +# reqconfig, else skip building ourselves. +# +# If we are being built externally, confirm installed lws was configured to +# support reqconfig, else error out with a helpful message about the problem. +# +MACRO(require_lws_config reqconfig _val result) + + if (DEFINED ${reqconfig}) + if (${reqconfig}) + set (rq 1) + else() + set (rq 0) + endif() + else() + set(rq 0) + endif() + + if (${_val} EQUAL ${rq}) + set(SAME 1) + else() + set(SAME 0) + endif() + + if (LWS_WITH_MINIMAL_EXAMPLES AND NOT ${SAME}) + if (${_val}) + message("${SAMP}: skipping as lws being built without ${reqconfig}") + else() + message("${SAMP}: skipping as lws built with ${reqconfig}") + endif() + set(${result} 0) + else() + if (LWS_WITH_MINIMAL_EXAMPLES) + set(MET ${SAME}) + else() + CHECK_C_SOURCE_COMPILES("#include \nint main(void) {\n#if defined(${reqconfig})\n return 0;\n#else\n fail;\n#endif\n return 0;\n}\n" HAS_${reqconfig}) + if (NOT DEFINED HAS_${reqconfig} OR NOT HAS_${reqconfig}) + set(HAS_${reqconfig} 0) + else() + set(HAS_${reqconfig} 1) + endif() + if ((HAS_${reqconfig} AND ${_val}) OR (NOT HAS_${reqconfig} AND NOT ${_val})) + set(MET 1) + else() + set(MET 0) + endif() + endif() + if (NOT MET) + if (${_val}) + message(FATAL_ERROR "This project requires lws must have been configured with ${reqconfig}") + else() + message(FATAL_ERROR "Lws configuration of ${reqconfig} is incompatible with this project") + endif() + endif() + endif() +ENDMACRO() + + +set(requirements 1) +require_lws_config(LWS_WITHOUT_CLIENT 0 requirements) + +if (requirements) + add_executable(${SAMP} ${SRCS}) + + if (websockets_shared) + target_link_libraries(${SAMP} websockets_shared) + add_dependencies(${SAMP} websockets_shared) + else() + target_link_libraries(${SAMP} websockets) + endif() +endif() diff --git a/minimal-examples/http-client/minimal-http-client-post/README.md b/minimal-examples/http-client/minimal-http-client-post/README.md new file mode 100644 index 00000000..9a7ff281 --- /dev/null +++ b/minimal-examples/http-client/minimal-http-client-post/README.md @@ -0,0 +1,74 @@ +# lws minimal http client POST + +This example demonstrates a multipart POST to + +https://libwebsockets.org/testserver/formtest + +setting both a form variable and uploading a +short file. + +The result of the POST form processing is captured +and displayed in a hexdump. + +This is programmatically POSTing to the same +form you can access at + +https://libwebsockets.org/testserver + +in the "POST" tab with file upload. + +By default the client action occurs using http/2 if +your lws was built with `-DLWS_WITH_HTTP2=1`. + +## build + +``` + $ cmake . && make +``` + +## usage + +``` + $ ./lws-minimal-http-client-post +[2018/04/03 13:13:10:7891] USER: LWS minimal http client - POST +[2018/04/03 13:13:10:7905] NOTICE: Creating Vhost 'default' (serving disabled), 1 protocols, IPv6 on +[2018/04/03 13:13:10:7984] NOTICE: created client ssl context for default +[2018/04/03 13:13:12:8444] USER: LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER +[2018/04/03 13:13:12:8444] USER: LWS_CALLBACK_CLIENT_HTTP_WRITEABLE +[2018/04/03 13:13:12:8445] USER: LWS_CALLBACK_CLIENT_HTTP_WRITEABLE +[2018/04/03 13:13:12:8445] USER: LWS_CALLBACK_CLIENT_HTTP_WRITEABLE +[2018/04/03 13:13:13:1437] USER: LWS_CALLBACK_CLIENT_HTTP_WRITEABLE +[2018/04/03 13:13:13:1440] USER: LWS_CALLBACK_CLIENT_HTTP_WRITEABLE +[2018/04/03 13:13:13:1440] USER: RECEIVE_CLIENT_HTTP_READ: read 402 +[2018/04/03 13:13:13:1441] NOTICE: +[2018/04/03 13:13:13:1441] NOTICE: 0000: 3C 68 74 6D 6C 3E 3C 62 6F 64 79 3E 3C 68 31 3E

+[2018/04/03 13:13:13:1441] NOTICE: 0010: 46 6F 72 6D 20 72 65 73 75 6C 74 73 20 28 61 66 Form results (af +[2018/04/03 13:13:13:1441] NOTICE: 0020: 74 65 72 20 75 72 6C 64 65 63 6F 64 69 6E 67 29 ter urldecoding) +[2018/04/03 13:13:13:1441] NOTICE: 0030: 3C 2F 68 31 3E 3C 74 61 62 6C 65 3E 3C 74 72 3E

+[2018/04/03 13:13:13:1441] NOTICE: 0040: 3C 74 64 3E 4E 61 6D 65 3C 2F 74 64 3E 3C 74 64 < +[2018/04/03 13:13:13:1441] NOTICE: 0070: 74 72 3E 3C 74 64 3E 3C 62 3E 74 65 78 74 3C 2F tr>< +[2018/04/03 13:13:13:1442] NOTICE: 00D0: 74 64 3E 4E 55 4C 4C 3C 2F 74 64 3E 3C 2F 74 72 td>NULL +[2018/04/03 13:13:13:1442] NOTICE: 0110: 3C 2F 74 72 3E 3C 74 72 3E 3C 74 64 3E 3C 62 3E < +[2018/04/03 13:13:13:1442] NOTICE: 0130: 74 64 3E 30 3C 2F 74 64 3E 3C 74 64 3E 4E 55 4C td>0
filena +[2018/04/03 13:13:13:1442] NOTICE: 0160: 6D 65 3A 3C 2F 62 3E 20 6D 79 66 69 6C 65 2E 74 me: myfile.t +[2018/04/03 13:13:13:1442] NOTICE: 0170: 78 74 2C 20 3C 62 3E 6C 65 6E 67 74 68 3C 2F 62 xt, length 44 +[2018/04/03 13:13:13:1442] NOTICE: +[2018/04/03 13:13:13:1442] USER: LWS_CALLBACK_COMPLETED_CLIENT_HTTP +[2018/04/03 13:13:13:1455] USER: Completed +``` + diff --git a/minimal-examples/http-client/minimal-http-client-post/libwebsockets.org.cer b/minimal-examples/http-client/minimal-http-client-post/libwebsockets.org.cer new file mode 100644 index 00000000..67de1292 --- /dev/null +++ b/minimal-examples/http-client/minimal-http-client-post/libwebsockets.org.cer @@ -0,0 +1,92 @@ +-----BEGIN CERTIFICATE----- +MIIGCDCCA/CgAwIBAgIQKy5u6tl1NmwUim7bo3yMBzANBgkqhkiG9w0BAQwFADCB +hTELMAkGA1UEBhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4G +A1UEBxMHU2FsZm9yZDEaMBgGA1UEChMRQ09NT0RPIENBIExpbWl0ZWQxKzApBgNV +BAMTIkNPTU9ETyBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkwHhcNMTQwMjEy 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This demonstrates the a minimal http client using lws and POST. + * + * It POSTs both form data and a file to the form at + * https://libwebsockets.org/testserver/formtest and dumps + * the html page received generated by the POST handler. + */ + +#include +#include +#include + +static int interrupted; +static struct lws *client_wsi; + +struct pss { + char boundary[32]; + char body_part; +}; + +static int +callback_http(struct lws *wsi, enum lws_callback_reasons reason, + void *user, void *in, size_t len) +{ + struct pss *pss = (struct pss *)user; + char buf[LWS_PRE + 1024], *start = &buf[LWS_PRE], *p = start, + *end = &buf[sizeof(buf) - 1]; + uint8_t **up, *uend; + uint32_t r; + int n; + + 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; + + /* ...callbacks related to receiving the result... */ + + case LWS_CALLBACK_ESTABLISHED_CLIENT_HTTP: + lwsl_user("LWS_CALLBACK_ESTABLISHED_CLIENT_HTTP: response %d\n", + lws_http_client_http_response(wsi)); + break; + + case LWS_CALLBACK_RECEIVE_CLIENT_HTTP_READ: + lwsl_user("RECEIVE_CLIENT_HTTP_READ: read %d\n", (int)len); + lwsl_hexdump_notice(in, len); + return 0; /* don't passthru */ + + case LWS_CALLBACK_RECEIVE_CLIENT_HTTP: + n = sizeof(buf) - LWS_PRE; + if (lws_http_client_read(wsi, &p, &n) < 0) + return -1; + + return 0; /* don't passthru */ + + case LWS_CALLBACK_COMPLETED_CLIENT_HTTP: + lwsl_user("LWS_CALLBACK_COMPLETED_CLIENT_HTTP\n"); + client_wsi = NULL; + break; + + /* ...callbacks related to generating the POST... */ + + case LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER: + lwsl_user("LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER\n"); + up = (uint8_t **)in; + uend = *up + len - 1; + + /* generate a random boundary string */ + + lws_get_random(lws_get_context(wsi), &r, sizeof(r)); + lws_snprintf(pss->boundary, sizeof(pss->boundary) - 1, + "---boundary-%08x", r); + + n = lws_snprintf(buf, sizeof(buf) - 1, + "multipart/form-data; boundary=%s", pss->boundary); + if (lws_add_http_header_by_token(wsi, + WSI_TOKEN_HTTP_CONTENT_TYPE, + (uint8_t *)buf, n, up, uend)) + return 1; + /* + * Notice because we are sending multipart/form-data we can + * usually rely on the server to understand where the form + * payload ends without having to give it an overall + * content-length (which can be troublesome to compute ahead + * of generating the data to send). + * + * Tell lws we are going to send the body next... + */ + lws_client_http_body_pending(wsi, 1); + lws_callback_on_writable(wsi); + break; + + case LWS_CALLBACK_CLIENT_HTTP_WRITEABLE: + lwsl_user("LWS_CALLBACK_CLIENT_HTTP_WRITEABLE\n"); + n = LWS_WRITE_HTTP; + + /* + * For a small body like this, we could prepare it in memory and + * send it all at once. But to show how to handle, eg, + * arbitrary-sized file payloads, or huge form-data fields, the + * sending is done in multiple passes through the event loop. + */ + + switch (pss->body_part++) { + case 0: + /* notice every usage of the boundary starts with -- */ + p += lws_snprintf(p, end - p, "--%s\xd\xa" + "content-disposition: " + "form-data; name=\"text\"\xd\xa" + "\xd\xa" + "my text field" + "\xd\xa", pss->boundary); + break; + case 1: + p += lws_snprintf(p, end - p, + "--%s\xd\xa" + "content-disposition: form-data; name=\"file\";" + "filename=\"myfile.txt\"\xd\xa" + "content-type: text/plain\xd\xa" + "\xd\xa" + "This is the contents of the " + "uploaded file.\xd\xa" + "\xd\xa", pss->boundary); + break; + case 2: + p += lws_snprintf(p, end - p, "--%s--\xd\xa", + pss->boundary); + lws_client_http_body_pending(wsi, 0); + /* necessary to support H2, it means we will write no + * more on this stream */ + n = LWS_WRITE_HTTP_FINAL; + break; + + default: + /* + * We can get extra callbacks here, if nothing to do, + * then do nothing. + */ + return 0; + } + + if (lws_write(wsi, (uint8_t *)start, lws_ptr_diff(p, start), n) + != lws_ptr_diff(p, start)) + return 1; + + if (n != LWS_WRITE_HTTP_FINAL) + lws_callback_on_writable(wsi); + + return 0; + + default: + break; + } + + return lws_callback_http_dummy(wsi, reason, user, in, len); +} + +static const struct lws_protocols protocols[] = { + { + "http", + callback_http, + sizeof(struct pss), + 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_USER | LLL_ERR | LLL_WARN | LLL_NOTICE + /* for LLL_ verbosity above NOTICE to be built into lws, + * lws must have been configured and built with + * -DCMAKE_BUILD_TYPE=DEBUG instead of =RELEASE */ + /* | LLL_INFO */ /* | LLL_PARSER */ /* | LLL_HEADER */ + /* | LLL_EXT */ /* | LLL_CLIENT */ /* | LLL_LATENCY */ + /* | LLL_DEBUG */, NULL); + + lwsl_user("LWS minimal http client - POST\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; + +#if defined(LWS_WITH_MBEDTLS) + /* + * OpenSSL uses the system trust store. mbedTLS has to be told which + * CA to trust explicitly. + */ + info.client_ssl_ca_filepath = "./libwebsockets.org.cer"; +#endif + + 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 = "libwebsockets.org"; + i.path = "/testserver/formtest"; + i.ssl_connection = /* LCCSCF_NOT_H2 | */ LCCSCF_USE_SSL; + i.host = i.address; + i.origin = i.address; + i.method = "POST"; + + 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; +}
NameLength +[2018/04/03 13:13:13:1441] NOTICE: 0060: 56 61 6C 75 65 3C 2F 74 64 3E 3C 2F 74 72 3E 3C Value
text13my text fi +[2018/04/03 13:13:13:1441] NOTICE: 00A0: 65 6C 64 3C 2F 74 64 3E 3C 2F 74 72 3E 3C 74 72 eld
send +[2018/04/03 13:13:13:1441] NOTICE: 00C0: 3C 2F 74 64 3E 3C 74 64 3E 30 3C 2F 74 64 3E 3C 0
file +[2018/04/03 13:13:13:1442] NOTICE: 00F0: 3C 2F 62 3E 3C 2F 74 64 3E 3C 74 64 3E 30 3C 2F 0NULL
+[2018/04/03 13:13:13:1442] NOTICE: 0120: 75 70 6C 6F 61 64 3C 2F 62 3E 3C 2F 74 64 3E 3C uploadNUL +[2018/04/03 13:13:13:1442] NOTICE: 0140: 4C 3C 2F 74 64 3E 3C 2F 74 72 3E 3C 2F 74 61 62 L