ah: custom headers for h1
Until now lws only parses headers it knows at build-time from its
prebuilt lexical analyzer.
This adds an on-by-default cmake option and a couple of apis
to also store and query "custom", ie, unknown-to-lws headers.
A minimal example is also provided.
At the moment it only works on h1, h2 support needs improvements
to the hpack implementation.
Since it bloats ah memory usage compared to without it if custom
headers are present, the related code and ah footprint can be
disabled with the cmake option LWS_WITH_CUSTOM_HEADERS, but it's
on by default normally. ESP32 platform disables it.
https://github.com/warmcat/libwebsockets/pull/1499
diff --git a/CMakeLists.txt b/CMakeLists.txt
index e808f12..0d1b507 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -114,6 +114,7 @@
option(LWS_REPRODUCIBLE "Build libwebsockets reproducible. It removes the build user and hostname from the build" ON)
option(LWS_WITH_MINIMAL_EXAMPLES "Also build the normally standalone minimal examples, for QA" OFF)
option(LWS_WITH_LWSAC "lwsac Chunk Allocation api" ON)
+option(LWS_WITH_CUSTOM_HEADERS "Store and allow querying custom HTTP headers (H1 only)" ON)
option(LWS_WITH_DISKCACHE "Hashed cache directory with lazy LRU deletion to size limit" OFF)
option(LWS_WITH_ASAN "Build with gcc runtime sanitizer options enabled (needs libasan)" OFF)
#
@@ -368,6 +369,7 @@
set(LWS_HAVE_REALLOC 1)
set(LWS_HAVE_GETIFADDRS 1)
set(LWS_WITH_ZIP_FOPS 1)
+ set(LWS_WITH_CUSTOM_HEADERS 0)
endif()
diff --git a/cmake/lws_config.h.in b/cmake/lws_config.h.in
index d54cbf6..079f611 100644
--- a/cmake/lws_config.h.in
+++ b/cmake/lws_config.h.in
@@ -80,6 +80,7 @@
#cmakedefine LWS_WITH_ACME
#cmakedefine LWS_WITH_BORINGSSL
#cmakedefine LWS_WITH_CGI
+#cmakedefine LWS_WITH_CUSTOM_HEADERS
#cmakedefine LWS_WITH_ESP32
#cmakedefine LWS_WITH_FTS
#cmakedefine LWS_WITH_GENCRYPTO
diff --git a/include/libwebsockets/lws-http.h b/include/libwebsockets/lws-http.h
index 22b195b..7316ae9 100644
--- a/include/libwebsockets/lws-http.h
+++ b/include/libwebsockets/lws-http.h
@@ -323,6 +323,9 @@
/* parser state additions, no storage associated */
WSI_TOKEN_NAME_PART,
+#if defined(LWS_WITH_CUSTOM_HEADERS)
+ WSI_TOKEN_UNKNOWN_VALUE_PART,
+#endif
WSI_TOKEN_SKIPPING,
WSI_TOKEN_SKIPPING_SAW_CR,
WSI_PARSING_COMPLETE,
@@ -404,6 +407,47 @@
enum lws_token_indexes h, int frag_idx);
/**
+ * lws_hdr_custom_length() - return length of a custom header
+ *
+ * \param wsi: websocket connection
+ * \param name: header string (including terminating :)
+ * \param nlen: length of name
+ *
+ * Lws knows about 100 common http headers, and parses them into indexes when
+ * it recognizes them. When it meets a header that it doesn't know, it stores
+ * the name and value directly, and you can look them up using
+ * lws_hdr_custom_length() and lws_hdr_custom_copy().
+ *
+ * This api returns -1, or the length of the value part of the header if it
+ * exists. Lws must be built with LWS_WITH_CUSTOM_HEADERS (on by default) to
+ * use this api.
+ */
+LWS_VISIBLE LWS_EXTERN int
+lws_hdr_custom_length(struct lws *wsi, const char *name, int nlen);
+
+/**
+ * lws_hdr_custom_copy() - copy value part of a custom header
+ *
+ * \param wsi: websocket connection
+ * \param dst: pointer to buffer to receive the copy
+ * \param len: number of bytes available at dst
+ * \param name: header string (including terminating :)
+ * \param nlen: length of name
+ *
+ * Lws knows about 100 common http headers, and parses them into indexes when
+ * it recognizes them. When it meets a header that it doesn't know, it stores
+ * the name and value directly, and you can look them up using
+ * lws_hdr_custom_length() and lws_hdr_custom_copy().
+ *
+ * This api returns -1, or the length of the string it copied into dst if it
+ * was big enough to contain both the string and an extra terminating NUL. Lws
+ * must be built with LWS_WITH_CUSTOM_HEADERS (on by default) to use this api.
+ */
+LWS_VISIBLE LWS_EXTERN int
+lws_hdr_custom_copy(struct lws *wsi, char *dst, int len, const char *name,
+ int nlen);
+
+/**
* lws_get_urlarg_by_name() - return pointer to arg value if present
* \param wsi: the connection to check
* \param name: the arg name, like "token="
diff --git a/lib/roles/h2/hpack.c b/lib/roles/h2/hpack.c
index e127dcd..9c218e5 100644
--- a/lib/roles/h2/hpack.c
+++ b/lib/roles/h2/hpack.c
@@ -1,7 +1,7 @@
/*
* lib/hpack.c
*
- * Copyright (C) 2014-2018 Andy Green <andy@warmcat.com>
+ * Copyright (C) 2014-2019 Andy Green <andy@warmcat.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
@@ -1190,6 +1190,9 @@
}
if (ah->parser_state == WSI_TOKEN_NAME_PART ||
+#if defined(LWS_WITH_CUSTOM_HEADERS)
+ ah->parser_state == WSI_TOKEN_UNKNOWN_VALUE_PART ||
+#endif
ah->parser_state == WSI_TOKEN_SKIPPING) {
h2n->unknown_header = 1;
ah->parser_state = -1;
diff --git a/lib/roles/http/client/client.c b/lib/roles/http/client/client.c
index c63faca..9a1aa00 100644
--- a/lib/roles/http/client/client.c
+++ b/lib/roles/http/client/client.c
@@ -433,6 +433,9 @@
#if defined(LWS_ROLE_H1) || defined(LWS_ROLE_H2)
w->http.ah->parser_state = WSI_TOKEN_NAME_PART;
w->http.ah->lextable_pos = 0;
+#if defined(LWS_WITH_CUSTOM_HEADERS)
+ w->http.ah->unk_pos = 0;
+#endif
/* If we're (re)starting on hdr, need other implied init */
wsi->http.ah->ues = URIES_IDLE;
#endif
@@ -458,6 +461,9 @@
/* prepare ourselves to do the parsing */
wsi->http.ah->parser_state = WSI_TOKEN_NAME_PART;
wsi->http.ah->lextable_pos = 0;
+#if defined(LWS_WITH_CUSTOM_HEADERS)
+ wsi->http.ah->unk_pos = 0;
+#endif
#endif
lwsi_set_state(wsi, LRS_WAITING_SERVER_REPLY);
lws_set_timeout(wsi, PENDING_TIMEOUT_AWAITING_SERVER_RESPONSE,
@@ -634,6 +640,9 @@
wsi->http.ah->parser_state = WSI_TOKEN_NAME_PART;
wsi->http.ah->lextable_pos = 0;
+#if defined(LWS_WITH_CUSTOM_HEADERS)
+ wsi->http.ah->unk_pos = 0;
+#endif
lws_set_timeout(wsi, PENDING_TIMEOUT_AWAITING_SERVER_RESPONSE,
wsi->context->timeout_secs);
diff --git a/lib/roles/http/private.h b/lib/roles/http/private.h
index a0f9d9f..08fd105 100644
--- a/lib/roles/http/private.h
+++ b/lib/roles/http/private.h
@@ -117,12 +117,20 @@
#ifndef LWS_NO_CLIENT
char initial_handshake_hash_base64[30];
#endif
-
- uint32_t pos;
- uint32_t http_response;
- uint32_t current_token_limit;
int hdr_token_idx;
+ ah_data_idx_t pos;
+ ah_data_idx_t http_response;
+ ah_data_idx_t current_token_limit;
+
+#if defined(LWS_WITH_CUSTOM_HEADERS)
+ ah_data_idx_t unk_pos; /* to undo speculative unknown header */
+ ah_data_idx_t unk_value_pos;
+
+ ah_data_idx_t unk_ll_head;
+ ah_data_idx_t unk_ll_tail;
+#endif
+
int16_t lextable_pos;
uint8_t in_use;
diff --git a/lib/roles/http/server/parsers.c b/lib/roles/http/server/parsers.c
index 4c7db99..2d0386c 100644
--- a/lib/roles/http/server/parsers.c
+++ b/lib/roles/http/server/parsers.c
@@ -27,6 +27,50 @@
#define FAIL_CHAR 0x08
+#if defined(LWS_WITH_CUSTOM_HEADERS)
+
+#define UHO_NLEN 0
+#define UHO_VLEN 2
+#define UHO_LL 4
+#define UHO_NAME 8
+
+static uint16_t
+lws_un16be_get(const void *_p)
+{
+ const uint8_t *p = _p;
+
+ return ((uint16_t)p[0] << 8) | p[1];
+}
+
+static void
+lws_un16be_set(void *_p, uint16_t v)
+{
+ uint8_t *p = _p;
+
+ *p++ = (uint8_t)(v >> 8);
+ *p++ = (uint8_t)v;
+}
+
+static uint32_t
+lws_un32be_get(const void *_p)
+{
+ const uint8_t *p = _p;
+
+ return (uint32_t)((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
+}
+
+static void
+lws_un32be_set(void *_p, uint32_t v)
+{
+ uint8_t *p = _p;
+
+ *p++ = (uint8_t)(v >> 24);
+ *p++ = (uint8_t)(v >> 16);
+ *p++ = (uint8_t)(v >> 8);
+ *p = (uint8_t)v;
+}
+#endif
+
static struct allocated_headers *
_lws_create_ah(struct lws_context_per_thread *pt, ah_data_idx_t data_size)
{
@@ -83,6 +127,11 @@
ah->http_response = 0;
ah->parser_state = WSI_TOKEN_NAME_PART;
ah->lextable_pos = 0;
+#if defined(LWS_WITH_CUSTOM_HEADERS)
+ ah->unk_pos = 0;
+ ah->unk_ll_head = 0;
+ ah->unk_ll_tail = 0;
+#endif
}
// doesn't scrub the ah rxbuffer by default, parent must do if needed
@@ -551,6 +600,62 @@
return toklen;
}
+#if defined(LWS_WITH_CUSTOM_HEADERS)
+LWS_VISIBLE int
+lws_hdr_custom_length(struct lws *wsi, const char *name, int nlen)
+{
+ ah_data_idx_t ll;
+
+ if (!wsi->http.ah || wsi->http2_substream)
+ return -1;
+
+ ll = wsi->http.ah->unk_ll_head;
+ while (ll) {
+ if (ll >= wsi->http.ah->data_length)
+ return -1;
+ if (nlen == lws_un16be_get(&wsi->http.ah->data[ll + UHO_NLEN]) &&
+ !strncmp(name, &wsi->http.ah->data[ll + UHO_NAME], nlen))
+ return lws_un16be_get(&wsi->http.ah->data[ll + UHO_VLEN]);
+
+ ll = lws_un32be_get(&wsi->http.ah->data[ll + UHO_LL]);
+ }
+
+ return -1;
+}
+
+LWS_VISIBLE int
+lws_hdr_custom_copy(struct lws *wsi, char *dst, int len, const char *name,
+ int nlen)
+{
+ ah_data_idx_t ll;
+ int n;
+
+ if (!wsi->http.ah || wsi->http2_substream)
+ return -1;
+
+ *dst = '\0';
+
+ ll = wsi->http.ah->unk_ll_head;
+ while (ll) {
+ if (ll >= wsi->http.ah->data_length)
+ return -1;
+ if (nlen == lws_un16be_get(&wsi->http.ah->data[ll + UHO_NLEN]) &&
+ !strncmp(name, &wsi->http.ah->data[ll + UHO_NAME], nlen)) {
+ n = lws_un16be_get(&wsi->http.ah->data[ll + UHO_VLEN]);
+ if (n + 1 > len)
+ return -1;
+ strncpy(dst, &wsi->http.ah->data[ll + UHO_NAME + nlen], n);
+ dst[n] = '\0';
+
+ return n;
+ }
+ ll = lws_un32be_get(&wsi->http.ah->data[ll + UHO_LL]);
+ }
+
+ return -1;
+}
+#endif
+
char *lws_hdr_simple_ptr(struct lws *wsi, enum lws_token_indexes h)
{
int n;
@@ -873,6 +978,32 @@
c = *buf++;
switch (ah->parser_state) {
+#if defined(LWS_WITH_CUSTOM_HEADERS)
+ case WSI_TOKEN_UNKNOWN_VALUE_PART:
+
+ if (c == '\r')
+ break;
+ if (c == '\n') {
+ lws_un16be_set(&ah->data[ah->unk_pos + 2],
+ ah->pos - ah->unk_value_pos);
+ ah->parser_state = WSI_TOKEN_NAME_PART;
+ ah->unk_pos = 0;
+ ah->lextable_pos = 0;
+ break;
+ }
+
+ /* trim leading whitespace */
+ if (ah->pos != ah->unk_value_pos ||
+ (c != ' ' && c != '\t')) {
+
+ if (lws_pos_in_bounds(wsi))
+ return -1;
+
+ ah->data[ah->pos++] = c;
+ }
+ pos = ah->lextable_pos;
+ break;
+#endif
default:
lwsl_parser("WSI_TOK_(%d) '%c'\n", ah->parser_state, c);
@@ -970,8 +1101,75 @@
if (c >= 'A' && c <= 'Z')
c += 'a' - 'A';
+#if defined(LWS_WITH_CUSTOM_HEADERS)
+ /*
+ * ...in case it's an unknown header, speculatively
+ * store it as the name comes in. If we recognize it as
+ * a known header, we'll snip this.
+ */
+
+ if (!ah->unk_pos) {
+ ah->unk_pos = ah->pos;
+ /*
+ * Prepare new unknown header linked-list entry
+ *
+ * - 16-bit BE: name part length
+ * - 16-bit BE: value part length
+ * - 32-bit BE: data offset of next, or 0
+ */
+ for (n = 0; n < 8; n++)
+ if (!lws_pos_in_bounds(wsi))
+ ah->data[ah->pos++] = 0;
+ }
+#endif
+
+ if (lws_pos_in_bounds(wsi))
+ return -1;
+
+ ah->data[ah->pos++] = c;
pos = ah->lextable_pos;
+#if defined(LWS_WITH_CUSTOM_HEADERS)
+ if (pos < 0 && c == ':') {
+ /*
+ * process unknown headers
+ *
+ * register us in the unknown hdr ll
+ */
+
+ if (!ah->unk_ll_head)
+ ah->unk_ll_head = ah->unk_pos;
+
+ if (ah->unk_ll_tail)
+ lws_un32be_set(&ah->data[ah->unk_ll_tail + UHO_LL],
+ ah->unk_pos);
+
+ ah->unk_ll_tail = ah->unk_pos;
+
+ lwsl_debug("%s: unk header %d '%.*s'\n",
+ __func__,
+ ah->pos - (ah->unk_pos + UHO_NAME),
+ ah->pos - (ah->unk_pos + UHO_NAME),
+ &ah->data[ah->unk_pos + UHO_NAME]);
+
+ /* set the unknown header name part length */
+
+ lws_un16be_set(&ah->data[ah->unk_pos],
+ (ah->pos - ah->unk_pos) - UHO_NAME);
+
+ ah->unk_value_pos = ah->pos;
+
+ /*
+ * collect whatever's coming for the unknown header
+ * argument until the next CRLF
+ */
+ ah->parser_state = WSI_TOKEN_UNKNOWN_VALUE_PART;
+ break;
+ }
+#endif
+ if (pos < 0)
+ break;
+
while (1) {
if (lextable[pos] & (1 << 7)) {
/* 1-byte, fail on mismatch */
@@ -993,7 +1191,16 @@
goto nope;
/* b7 = 0, end or 3-byte */
- if (lextable[pos] < FAIL_CHAR) { /* term mark */
+ if (lextable[pos] < FAIL_CHAR) {
+#if defined(LWS_WITH_CUSTOM_HEADERS)
+ /*
+ * We hit a terminal marker, so we
+ * recognized this header... drop the
+ * speculative name part storage
+ */
+ ah->pos = ah->unk_pos;
+ ah->unk_pos = 0;
+#endif
ah->lextable_pos = pos;
break;
}
@@ -1011,30 +1218,43 @@
}
/*
- * If it's h1, server needs to look out for unknown
- * methods...
+ * If it's h1, server needs to be on the look out for
+ * unknown methods...
*/
if (ah->lextable_pos < 0 && lwsi_role_h1(wsi) &&
lwsi_role_server(wsi)) {
- /* this is not a header we know about */
+ /*
+ * this is not a header we know about... did
+ * we get a valid method (GET, POST etc)
+ * already, or is this the bogus method?
+ */
for (m = 0; m < LWS_ARRAY_SIZE(methods); m++)
if (ah->frag_index[methods[m]]) {
/*
- * already had the method, no idea what
- * this crap from the client is, ignore
+ * already had the method
*/
+#if !defined(LWS_WITH_CUSTOM_HEADERS)
ah->parser_state = WSI_TOKEN_SKIPPING;
+#endif
break;
}
- /*
- * hm it's an unknown http method from a client in fact,
- * it cannot be valid http
- */
+
if (m != LWS_ARRAY_SIZE(methods))
+#if defined(LWS_WITH_CUSTOM_HEADERS)
+ /*
+ * We have the method, this is just an
+ * unknown header then
+ */
+ goto unknown_hdr;
+#else
break;
+#endif
/*
- * are we set up to transition to
- * another role in these cases?
+ * ...it's an unknown http method from a client
+ * in fact, it cannot be valid http.
+ *
+ * Are we set up to transition to another role
+ * in these cases?
*/
if (lws_check_opt(wsi->vhost->options,
LWS_SERVER_OPTION_FALLBACK_TO_APPLY_LISTEN_ACCEPT_CONFIG)) {
@@ -1047,13 +1267,17 @@
lwsl_info("Unknown method - dropping\n");
goto forbid;
}
- /*
- * ...otherwise for a client, let him ignore unknown headers
- * coming from the server
- */
if (ah->lextable_pos < 0) {
+#if defined(LWS_WITH_CUSTOM_HEADERS)
+ goto unknown_hdr;
+#else
+ /*
+ * ...otherwise for a client, let him ignore
+ * unknown headers coming from the server
+ */
ah->parser_state = WSI_TOKEN_SKIPPING;
break;
+#endif
}
if (lextable[ah->lextable_pos] < FAIL_CHAR) {
@@ -1096,6 +1320,13 @@
}
break;
+#if defined(LWS_WITH_CUSTOM_HEADERS)
+unknown_hdr:
+ //ah->parser_state = WSI_TOKEN_SKIPPING;
+ //break;
+ break;
+#endif
+
start_fragment:
ah->nfrag++;
excessive:
@@ -1138,6 +1369,9 @@
goto forbid;
if (c == '\x0a') {
ah->parser_state = WSI_TOKEN_NAME_PART;
+#if defined(LWS_WITH_CUSTOM_HEADERS)
+ ah->unk_pos = 0;
+#endif
ah->lextable_pos = 0;
} else
ah->parser_state = WSI_TOKEN_SKIPPING;
diff --git a/minimal-examples/http-server/README.md b/minimal-examples/http-server/README.md
index 48644bc..82d29f4 100644
--- a/minimal-examples/http-server/README.md
+++ b/minimal-examples/http-server/README.md
@@ -1,6 +1,7 @@
|Example|Demonstrates|
---|---
minimal-http-server-basicauth|Shows how to protect a mount using a password file and basic auth
+minimal-http-server-custom-headers|Shows how to query custom headers that lws doesn't already know
minimal-http-server-deaddrop|Shows how to use the deaddrop drag and drop file upload + sharing plugin
minimal-http-server-dynamic|Serves both static and dynamically generated http content
minimal-http-server-eventlib-foreign|Demonstrates integrating lws with a foreign event library
diff --git a/minimal-examples/http-server/minimal-http-server-custom-headers/CMakeLists.txt b/minimal-examples/http-server/minimal-http-server-custom-headers/CMakeLists.txt
new file mode 100644
index 0000000..92d0d18
--- /dev/null
+++ b/minimal-examples/http-server/minimal-http-server-custom-headers/CMakeLists.txt
@@ -0,0 +1,78 @@
+cmake_minimum_required(VERSION 2.8)
+include(CheckCSourceCompiles)
+
+set(SAMP lws-minimal-http-server-custom-headers)
+set(SRCS minimal-http-server-custom-headers.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 ${SAME})
+ else()
+ CHECK_C_SOURCE_COMPILES("#include <libwebsockets.h>\nint main(void) {\n#if defined(${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 ${reqconfig} is incompatible with this project")
+ endif()
+ endif()
+ endif()
+ENDMACRO()
+
+set(requirements 1)
+require_lws_config(LWS_ROLE_H1 1 requirements)
+require_lws_config(LWS_WITH_CUSTOM_HEADERS 1 requirements)
+require_lws_config(LWS_WITHOUT_SERVER 0 requirements)
+
+if (requirements)
+ add_executable(${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-server/minimal-http-server-custom-headers/README.md b/minimal-examples/http-server/minimal-http-server-custom-headers/README.md
new file mode 100644
index 0000000..9666d02
--- /dev/null
+++ b/minimal-examples/http-server/minimal-http-server-custom-headers/README.md
@@ -0,0 +1,20 @@
+# lws minimal http server dynamic content
+
+## build
+
+```
+ $ cmake . && make
+```
+
+## usage
+
+```
+ $ ./lws-minimal-http-server-dynamic
+[2018/03/20 10:24:24:7099] USER: LWS minimal http server dynamic | visit http://localhost:7681
+[2018/03/20 10:24:24:7099] NOTICE: Creating Vhost 'default' port 7681, 1 protocols, IPv6 off
+```
+
+Visit http://localhost:7681, which is all static content.
+
+Click on the link to /dyn/anything, this opens a new tab with dynamicly-produced content.
+
diff --git a/minimal-examples/http-server/minimal-http-server-custom-headers/localhost-100y.cert b/minimal-examples/http-server/minimal-http-server-custom-headers/localhost-100y.cert
new file mode 100644
index 0000000..6f372db
--- /dev/null
+++ b/minimal-examples/http-server/minimal-http-server-custom-headers/localhost-100y.cert
@@ -0,0 +1,34 @@
+-----BEGIN CERTIFICATE-----
+MIIF5jCCA86gAwIBAgIJANq50IuwPFKgMA0GCSqGSIb3DQEBCwUAMIGGMQswCQYD
+VQQGEwJHQjEQMA4GA1UECAwHRXJld2hvbjETMBEGA1UEBwwKQWxsIGFyb3VuZDEb
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+e2Hl/7M0c/lbZ4FvXgARlex2rkgS0Ka06HE=
+-----END CERTIFICATE-----
diff --git a/minimal-examples/http-server/minimal-http-server-custom-headers/localhost-100y.key b/minimal-examples/http-server/minimal-http-server-custom-headers/localhost-100y.key
new file mode 100644
index 0000000..148f859
--- /dev/null
+++ b/minimal-examples/http-server/minimal-http-server-custom-headers/localhost-100y.key
@@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----
+MIIJQwIBADANBgkqhkiG9w0BAQEFAASCCS0wggkpAgEAAoICAQCjYtuWaICCY0tJ
+PubxpIgIL+WWmz/fmK8IQr11Wtee6/IUyUlo5I602mq1qcLhT/kmpoR8Di3DAmHK
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+fBrpEY1IATtPq1taBZZogRqI3rOkkPk=
+-----END PRIVATE KEY-----
diff --git a/minimal-examples/http-server/minimal-http-server-custom-headers/minimal-http-server-custom-headers.c b/minimal-examples/http-server/minimal-http-server-custom-headers/minimal-http-server-custom-headers.c
new file mode 100644
index 0000000..83f309b
--- /dev/null
+++ b/minimal-examples/http-server/minimal-http-server-custom-headers/minimal-http-server-custom-headers.c
@@ -0,0 +1,220 @@
+/*
+ * lws-minimal-http-server-custom-headers
+ *
+ * Copyright (C) 2019 Andy Green <andy@warmcat.com>
+ *
+ * This file is made available under the Creative Commons CC0 1.0
+ * Universal Public Domain Dedication.
+ *
+ * This demonstrates a minimal http server that can produce dynamic http
+ * content as well as static content.
+ *
+ * To keep it simple, it serves the static stuff from the subdirectory
+ * "./mount-origin" of the directory it was started in.
+ *
+ * You can change that by changing mount.origin below.
+ */
+
+#include <libwebsockets.h>
+#include <string.h>
+#include <signal.h>
+#include <time.h>
+
+static int interrupted;
+
+struct pss {
+ char result[128 + LWS_PRE];
+ int len;
+};
+
+/*
+ * This just lets us override LWS_CALLBACK_HTTP handling before passing it
+ * and everything else to the default handler.
+ */
+
+static int
+callback_http(struct lws *wsi, enum lws_callback_reasons reason,
+ void *user, void *in, size_t len)
+{
+ uint8_t buf[LWS_PRE + 2048], *start = &buf[LWS_PRE], *p = start,
+ *end = &buf[sizeof(buf) - LWS_PRE - 1];
+ struct pss *pss = (struct pss *)user;
+ char value[32], *pr = &pss->result[LWS_PRE];
+ int n, e = sizeof(pss->result) - LWS_PRE;
+
+ switch (reason) {
+ case LWS_CALLBACK_HTTP:
+ /*
+ * LWS doesn't have the "DNT" header built-in. But we can
+ * query it using the "custom" versions of the header apis.
+ *
+ * You can set your modern browser to issue DNT, look in the
+ * privacy settings of your browser.
+ */
+
+ pss->len = 0;
+ n = lws_hdr_custom_length(wsi, "dnt:", 4);
+ if (n < 0)
+ pss->len = lws_snprintf(pr, e,
+ "%s: DNT header not found\n", __func__);
+ else {
+
+ pss->len = lws_snprintf(pr, e,
+ "%s: DNT length %d<br>", __func__, n);
+ n = lws_hdr_custom_copy(wsi, value, sizeof(value), "dnt:", 4);
+ if (n < 0)
+ pss->len += lws_snprintf(pr + pss->len, e - pss->len,
+ "%s: unable to get DNT value\n", __func__);
+ else
+
+ pss->len += lws_snprintf(pr + pss->len , e - pss->len,
+ "%s: DNT value '%s'\n", __func__, value);
+ }
+
+ lwsl_user("%s\n", pr);
+
+ if (lws_add_http_common_headers(wsi, HTTP_STATUS_OK,
+ "text/html", pss->len, &p, end))
+ return 1;
+
+ if (lws_finalize_write_http_header(wsi, start, &p, end))
+ return 1;
+
+
+ /* write the body separately */
+ lws_callback_on_writable(wsi);
+ return 0;
+
+ case LWS_CALLBACK_HTTP_WRITEABLE:
+
+ strcpy((char *)start, "hello");
+
+ if (lws_write(wsi, (uint8_t *)pr, pss->len, LWS_WRITE_HTTP_FINAL) != pss->len)
+ return 1;
+
+ if (lws_http_transaction_completed(wsi))
+ return -1;
+ return 0;
+
+ default:
+ break;
+ }
+
+ return lws_callback_http_dummy(wsi, reason, user, in, len);
+}
+
+static struct lws_protocols protocols[] = {
+ { "http", callback_http, sizeof(struct pss), 0 },
+ { NULL, NULL, 0, 0 } /* terminator */
+};
+
+static const struct lws_http_mount mount_dyn = {
+ /* .mount_next */ NULL, /* linked-list "next" */
+ /* .mountpoint */ "/dyn", /* mountpoint URL */
+ /* .origin */ NULL, /* protocol */
+ /* .def */ NULL,
+ /* .protocol */ "http",
+ /* .cgienv */ NULL,
+ /* .extra_mimetypes */ NULL,
+ /* .interpret */ NULL,
+ /* .cgi_timeout */ 0,
+ /* .cache_max_age */ 0,
+ /* .auth_mask */ 0,
+ /* .cache_reusable */ 0,
+ /* .cache_revalidate */ 0,
+ /* .cache_intermediaries */ 0,
+ /* .origin_protocol */ LWSMPRO_CALLBACK, /* dynamic */
+ /* .mountpoint_len */ 4, /* char count */
+ /* .basic_auth_login_file */ NULL,
+};
+
+/* default mount serves the URL space from ./mount-origin */
+
+static const struct lws_http_mount mount = {
+ /* .mount_next */ &mount_dyn, /* linked-list "next" */
+ /* .mountpoint */ "/", /* mountpoint URL */
+ /* .origin */ "./mount-origin", /* serve from dir */
+ /* .def */ "index.html", /* default filename */
+ /* .protocol */ NULL,
+ /* .cgienv */ NULL,
+ /* .extra_mimetypes */ NULL,
+ /* .interpret */ NULL,
+ /* .cgi_timeout */ 0,
+ /* .cache_max_age */ 0,
+ /* .auth_mask */ 0,
+ /* .cache_reusable */ 0,
+ /* .cache_revalidate */ 0,
+ /* .cache_intermediaries */ 0,
+ /* .origin_protocol */ LWSMPRO_FILE, /* files in a dir */
+ /* .mountpoint_len */ 1, /* char count */
+ /* .basic_auth_login_file */ NULL,
+};
+
+void sigint_handler(int sig)
+{
+ interrupted = 1;
+}
+
+int main(int argc, const char **argv)
+{
+ struct lws_context_creation_info info;
+ struct lws_context *context;
+ const char *p;
+ int n = 0, logs = LLL_USER | LLL_ERR | LLL_WARN | LLL_NOTICE;
+
+ signal(SIGINT, sigint_handler);
+
+ if ((p = lws_cmdline_option(argc, argv, "-d")))
+ logs = atoi(p);
+
+ lws_set_log_level(logs, NULL);
+ lwsl_user("LWS minimal http server custom headers | visit http://localhost:7681\n");
+
+ memset(&info, 0, sizeof info); /* otherwise uninitialized garbage */
+ info.options = LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT |
+ LWS_SERVER_OPTION_EXPLICIT_VHOSTS |
+ LWS_SERVER_OPTION_HTTP_HEADERS_SECURITY_BEST_PRACTICES_ENFORCE;
+
+ /* for testing ah queue, not useful in real world */
+ if (lws_cmdline_option(argc, argv, "--ah1"))
+ info.max_http_header_pool = 1;
+
+ context = lws_create_context(&info);
+ if (!context) {
+ lwsl_err("lws init failed\n");
+ return 1;
+ }
+
+ /* http on 7681 */
+
+ info.port = 7681;
+ info.protocols = protocols;
+ info.mounts = &mount;
+ info.vhost_name = "http";
+
+ if (!lws_create_vhost(context, &info)) {
+ lwsl_err("Failed to create tls vhost\n");
+ goto bail;
+ }
+
+ /* https on 7682 */
+
+ info.port = 7682;
+ info.error_document_404 = "/404.html";
+ info.ssl_cert_filepath = "localhost-100y.cert";
+ info.ssl_private_key_filepath = "localhost-100y.key";
+ info.vhost_name = "https";
+
+ if (!lws_create_vhost(context, &info)) {
+ lwsl_err("Failed to create tls vhost\n");
+ goto bail;
+ }
+
+ while (n >= 0 && !interrupted)
+ n = lws_service(context, 1000);
+
+bail:
+ lws_context_destroy(context);
+
+ return 0;
+}
diff --git a/minimal-examples/http-server/minimal-http-server-custom-headers/mount-origin/404.html b/minimal-examples/http-server/minimal-http-server-custom-headers/mount-origin/404.html
new file mode 100644
index 0000000..6f85f25
--- /dev/null
+++ b/minimal-examples/http-server/minimal-http-server-custom-headers/mount-origin/404.html
@@ -0,0 +1,9 @@
+<meta charset="UTF-8">
+<html>
+ <body>
+ <img src="libwebsockets.org-logo.svg"><br>
+ <h1>404</h1>
+ Sorry, that file doesn't exist.
+ </body>
+</html>
+
diff --git a/minimal-examples/http-server/minimal-http-server-custom-headers/mount-origin/error.css b/minimal-examples/http-server/minimal-http-server-custom-headers/mount-origin/error.css
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/minimal-examples/http-server/minimal-http-server-custom-headers/mount-origin/error.css
diff --git a/minimal-examples/http-server/minimal-http-server-custom-headers/mount-origin/favicon.ico b/minimal-examples/http-server/minimal-http-server-custom-headers/mount-origin/favicon.ico
new file mode 100644
index 0000000..c0cc2e3
--- /dev/null
+++ b/minimal-examples/http-server/minimal-http-server-custom-headers/mount-origin/favicon.ico
Binary files differ
diff --git a/minimal-examples/http-server/minimal-http-server-custom-headers/mount-origin/index.html b/minimal-examples/http-server/minimal-http-server-custom-headers/mount-origin/index.html
new file mode 100644
index 0000000..a5fbbd7
--- /dev/null
+++ b/minimal-examples/http-server/minimal-http-server-custom-headers/mount-origin/index.html
@@ -0,0 +1,20 @@
+<html>
+ <head>
+ <meta charset=utf-8 http-equiv="Content-Language" content="en"/>
+ </head>
+ <body>
+ <img src="libwebsockets.org-logo.svg">
+ <img src="strict-csp.svg"><br>
+
+ Hello from the <b>minimal http server custom headers example</b>.
+ <p>
+ The idea is it will tell you what your browser sent for DNT, a header lws doesn't already know.
+ <p>
+ At the moment the custom header api only works on h1.
+ <p>
+
+ <a href="http://127.0.0.1:7681/dyn/xxx" >Show DNT header using h1 over http</a><br>
+ <a href="https://127.0.0.1:7682/dyn/xxx" >Show DNT header using h1 (h2 if enabled) over https</a><br>
+ </body>
+</html>
+
diff --git a/minimal-examples/http-server/minimal-http-server-custom-headers/mount-origin/libwebsockets.org-logo.svg b/minimal-examples/http-server/minimal-http-server-custom-headers/mount-origin/libwebsockets.org-logo.svg
new file mode 100644
index 0000000..7baea64
--- /dev/null
+++ b/minimal-examples/http-server/minimal-http-server-custom-headers/mount-origin/libwebsockets.org-logo.svg
@@ -0,0 +1,120 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="127.63mm" height="27.837mm" version="1.1" viewBox="0 0 127.63446 27.837189" xmlns="http://www.w3.org/2000/svg">
+ <defs>
+ <filter id="a" x="-.011681" y="-.053882" width="1.0234" height="1.1078" color-interpolation-filters="sRGB">
+ <feGaussianBlur stdDeviation="0.10687168"/>
+ </filter>
+ </defs>
+ <g transform="translate(452.86 42.871)">
+ <rect x="-452.86" y="-42.871" width="127.63" height="27.837" fill="none"/>
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diff --git a/minimal-examples/http-server/minimal-http-server-custom-headers/mount-origin/strict-csp.svg b/minimal-examples/http-server/minimal-http-server-custom-headers/mount-origin/strict-csp.svg
new file mode 100644
index 0000000..cd128f1
--- /dev/null
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