diff options
Diffstat (limited to 'examples')
| -rw-r--r-- | examples/.gitignore | 5 | ||||
| -rw-r--r-- | examples/CMakeLists.txt | 37 | ||||
| -rw-r--r-- | examples/Makefile.am | 54 | ||||
| -rw-r--r-- | examples/client.c | 699 | ||||
| -rw-r--r-- | examples/deflate.c | 206 | ||||
| -rw-r--r-- | examples/libevent-client.c | 595 | ||||
| -rw-r--r-- | examples/libevent-server.c | 787 |
7 files changed, 2383 insertions, 0 deletions
diff --git a/examples/.gitignore b/examples/.gitignore new file mode 100644 index 0000000..16335a5 --- /dev/null +++ b/examples/.gitignore @@ -0,0 +1,5 @@ +client +libevent-client +libevent-server +deflate +tiny-nghttpd diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt new file mode 100644 index 0000000..7a57bbf --- /dev/null +++ b/examples/CMakeLists.txt @@ -0,0 +1,37 @@ +if(ENABLE_EXAMPLES) + file(GLOB c_sources *.c) + set_source_files_properties(${c_sources} PROPERTIES + COMPILE_FLAGS "${WARNCFLAGS}") + file(GLOB cxx_sources *.cc) + set_source_files_properties(${cxx_sources} PROPERTIES + COMPILE_FLAGS "${WARNCXXFLAGS} ${CXX1XCXXFLAGS}") + + include_directories( + ${CMAKE_CURRENT_SOURCE_DIR} + "${CMAKE_CURRENT_SOURCE_DIR}/../third-party" + "${CMAKE_CURRENT_SOURCE_DIR}/../third-party/llhttp/include" + + ${LIBEVENT_INCLUDE_DIRS} + ${OPENSSL_INCLUDE_DIRS} + ) + + link_libraries( + nghttp2 + ${LIBEVENT_OPENSSL_LIBRARIES} + ${OPENSSL_LIBRARIES} + ${APP_LIBRARIES} + ) + + add_executable(client client.c $<TARGET_OBJECTS:llhttp> + $<TARGET_OBJECTS:url-parser> + ) + add_executable(libevent-client libevent-client.c $<TARGET_OBJECTS:llhttp> + $<TARGET_OBJECTS:url-parser> + ) + add_executable(libevent-server libevent-server.c $<TARGET_OBJECTS:llhttp> + $<TARGET_OBJECTS:url-parser> + ) + add_executable(deflate deflate.c $<TARGET_OBJECTS:llhttp> + $<TARGET_OBJECTS:url-parser> + ) +endif() diff --git a/examples/Makefile.am b/examples/Makefile.am new file mode 100644 index 0000000..7b682ed --- /dev/null +++ b/examples/Makefile.am @@ -0,0 +1,54 @@ +# nghttp2 - HTTP/2 C Library + +# Copyright (c) 2012 Tatsuhiro Tsujikawa + +# Permission is hereby granted, free of charge, to any person obtaining +# a copy of this software and associated documentation files (the +# "Software"), to deal in the Software without restriction, including +# without limitation the rights to use, copy, modify, merge, publish, +# distribute, sublicense, and/or sell copies of the Software, and to +# permit persons to whom the Software is furnished to do so, subject to +# the following conditions: + +# The above copyright notice and this permission notice shall be +# included in all copies or substantial portions of the Software. + +# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, +# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND +# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE +# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION +# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION +# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + +EXTRA_DIST = CMakeLists.txt + +if ENABLE_EXAMPLES + +AM_CFLAGS = $(WARNCFLAGS) +AM_CXXFLAGS = $(WARNCXXFLAGS) $(CXX1XCXXFLAGS) +AM_CPPFLAGS = \ + -I$(top_srcdir)/lib/includes \ + -I$(top_builddir)/lib/includes \ + -I$(top_srcdir)/third-party \ + @LIBEVENT_OPENSSL_CFLAGS@ \ + @OPENSSL_CFLAGS@ \ + @DEFS@ +AM_LDFLAGS = @LIBTOOL_LDFLAGS@ +LDADD = $(top_builddir)/lib/libnghttp2.la \ + $(top_builddir)/third-party/liburl-parser.la \ + @LIBEVENT_OPENSSL_LIBS@ \ + @OPENSSL_LIBS@ \ + @APPLDFLAGS@ + +noinst_PROGRAMS = client libevent-client libevent-server deflate + +client_SOURCES = client.c + +libevent_client_SOURCES = libevent-client.c + +libevent_server_SOURCES = libevent-server.c + +deflate_SOURCES = deflate.c + +endif # ENABLE_EXAMPLES diff --git a/examples/client.c b/examples/client.c new file mode 100644 index 0000000..ce8d1d0 --- /dev/null +++ b/examples/client.c @@ -0,0 +1,699 @@ +/* + * nghttp2 - HTTP/2 C Library + * + * Copyright (c) 2013 Tatsuhiro Tsujikawa + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE + * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION + * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ +/* + * This program is written to show how to use nghttp2 API in C and + * intentionally made simple. + */ +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif /* HAVE_CONFIG_H */ + +#include <inttypes.h> +#include <stdlib.h> +#ifdef HAVE_UNISTD_H +# include <unistd.h> +#endif /* HAVE_UNISTD_H */ +#ifdef HAVE_FCNTL_H +# include <fcntl.h> +#endif /* HAVE_FCNTL_H */ +#include <sys/types.h> +#ifdef HAVE_SYS_SOCKET_H +# include <sys/socket.h> +#endif /* HAVE_SYS_SOCKET_H */ +#ifdef HAVE_NETDB_H +# include <netdb.h> +#endif /* HAVE_NETDB_H */ +#ifdef HAVE_NETINET_IN_H +# include <netinet/in.h> +#endif /* HAVE_NETINET_IN_H */ +#include <netinet/tcp.h> +#include <poll.h> +#include <signal.h> +#include <stdio.h> +#include <assert.h> +#include <string.h> +#include <errno.h> + +#include <nghttp2/nghttp2.h> + +#include <openssl/ssl.h> +#include <openssl/err.h> +#include <openssl/conf.h> + +enum { IO_NONE, WANT_READ, WANT_WRITE }; + +#define MAKE_NV(NAME, VALUE) \ + { \ + (uint8_t *)NAME, (uint8_t *)VALUE, sizeof(NAME) - 1, sizeof(VALUE) - 1, \ + NGHTTP2_NV_FLAG_NONE \ + } + +#define MAKE_NV_CS(NAME, VALUE) \ + { \ + (uint8_t *)NAME, (uint8_t *)VALUE, sizeof(NAME) - 1, strlen(VALUE), \ + NGHTTP2_NV_FLAG_NONE \ + } + +struct Connection { + SSL *ssl; + nghttp2_session *session; + /* WANT_READ if SSL/TLS connection needs more input; or WANT_WRITE + if it needs more output; or IO_NONE. This is necessary because + SSL/TLS re-negotiation is possible at any time. nghttp2 API + offers similar functions like nghttp2_session_want_read() and + nghttp2_session_want_write() but they do not take into account + SSL/TSL connection. */ + int want_io; +}; + +struct Request { + char *host; + /* In this program, path contains query component as well. */ + char *path; + /* This is the concatenation of host and port with ":" in + between. */ + char *hostport; + /* Stream ID for this request. */ + int32_t stream_id; + uint16_t port; +}; + +struct URI { + const char *host; + /* In this program, path contains query component as well. */ + const char *path; + size_t pathlen; + const char *hostport; + size_t hostlen; + size_t hostportlen; + uint16_t port; +}; + +/* + * Returns copy of string |s| with the length |len|. The returned + * string is NULL-terminated. + */ +static char *strcopy(const char *s, size_t len) { + char *dst; + dst = malloc(len + 1); + memcpy(dst, s, len); + dst[len] = '\0'; + return dst; +} + +/* + * Prints error message |msg| and exit. + */ +NGHTTP2_NORETURN +static void die(const char *msg) { + fprintf(stderr, "FATAL: %s\n", msg); + exit(EXIT_FAILURE); +} + +/* + * Prints error containing the function name |func| and message |msg| + * and exit. + */ +NGHTTP2_NORETURN +static void dief(const char *func, const char *msg) { + fprintf(stderr, "FATAL: %s: %s\n", func, msg); + exit(EXIT_FAILURE); +} + +/* + * Prints error containing the function name |func| and error code + * |error_code| and exit. + */ +NGHTTP2_NORETURN +static void diec(const char *func, int error_code) { + fprintf(stderr, "FATAL: %s: error_code=%d, msg=%s\n", func, error_code, + nghttp2_strerror(error_code)); + exit(EXIT_FAILURE); +} + +/* + * The implementation of nghttp2_send_callback type. Here we write + * |data| with size |length| to the network and return the number of + * bytes actually written. See the documentation of + * nghttp2_send_callback for the details. + */ +static ssize_t send_callback(nghttp2_session *session, const uint8_t *data, + size_t length, int flags, void *user_data) { + struct Connection *connection; + int rv; + (void)session; + (void)flags; + + connection = (struct Connection *)user_data; + connection->want_io = IO_NONE; + ERR_clear_error(); + rv = SSL_write(connection->ssl, data, (int)length); + if (rv <= 0) { + int err = SSL_get_error(connection->ssl, rv); + if (err == SSL_ERROR_WANT_WRITE || err == SSL_ERROR_WANT_READ) { + connection->want_io = + (err == SSL_ERROR_WANT_READ ? WANT_READ : WANT_WRITE); + rv = NGHTTP2_ERR_WOULDBLOCK; + } else { + rv = NGHTTP2_ERR_CALLBACK_FAILURE; + } + } + return rv; +} + +/* + * The implementation of nghttp2_recv_callback type. Here we read data + * from the network and write them in |buf|. The capacity of |buf| is + * |length| bytes. Returns the number of bytes stored in |buf|. See + * the documentation of nghttp2_recv_callback for the details. + */ +static ssize_t recv_callback(nghttp2_session *session, uint8_t *buf, + size_t length, int flags, void *user_data) { + struct Connection *connection; + int rv; + (void)session; + (void)flags; + + connection = (struct Connection *)user_data; + connection->want_io = IO_NONE; + ERR_clear_error(); + rv = SSL_read(connection->ssl, buf, (int)length); + if (rv < 0) { + int err = SSL_get_error(connection->ssl, rv); + if (err == SSL_ERROR_WANT_WRITE || err == SSL_ERROR_WANT_READ) { + connection->want_io = + (err == SSL_ERROR_WANT_READ ? WANT_READ : WANT_WRITE); + rv = NGHTTP2_ERR_WOULDBLOCK; + } else { + rv = NGHTTP2_ERR_CALLBACK_FAILURE; + } + } else if (rv == 0) { + rv = NGHTTP2_ERR_EOF; + } + return rv; +} + +static int on_frame_send_callback(nghttp2_session *session, + const nghttp2_frame *frame, void *user_data) { + size_t i; + (void)user_data; + + switch (frame->hd.type) { + case NGHTTP2_HEADERS: + if (nghttp2_session_get_stream_user_data(session, frame->hd.stream_id)) { + const nghttp2_nv *nva = frame->headers.nva; + printf("[INFO] C ----------------------------> S (HEADERS)\n"); + for (i = 0; i < frame->headers.nvlen; ++i) { + fwrite(nva[i].name, 1, nva[i].namelen, stdout); + printf(": "); + fwrite(nva[i].value, 1, nva[i].valuelen, stdout); + printf("\n"); + } + } + break; + case NGHTTP2_RST_STREAM: + printf("[INFO] C ----------------------------> S (RST_STREAM)\n"); + break; + case NGHTTP2_GOAWAY: + printf("[INFO] C ----------------------------> S (GOAWAY)\n"); + break; + } + return 0; +} + +static int on_frame_recv_callback(nghttp2_session *session, + const nghttp2_frame *frame, void *user_data) { + size_t i; + (void)user_data; + + switch (frame->hd.type) { + case NGHTTP2_HEADERS: + if (frame->headers.cat == NGHTTP2_HCAT_RESPONSE) { + const nghttp2_nv *nva = frame->headers.nva; + struct Request *req; + req = nghttp2_session_get_stream_user_data(session, frame->hd.stream_id); + if (req) { + printf("[INFO] C <---------------------------- S (HEADERS)\n"); + for (i = 0; i < frame->headers.nvlen; ++i) { + fwrite(nva[i].name, 1, nva[i].namelen, stdout); + printf(": "); + fwrite(nva[i].value, 1, nva[i].valuelen, stdout); + printf("\n"); + } + } + } + break; + case NGHTTP2_RST_STREAM: + printf("[INFO] C <---------------------------- S (RST_STREAM)\n"); + break; + case NGHTTP2_GOAWAY: + printf("[INFO] C <---------------------------- S (GOAWAY)\n"); + break; + } + return 0; +} + +/* + * The implementation of nghttp2_on_stream_close_callback type. We use + * this function to know the response is fully received. Since we just + * fetch 1 resource in this program, after reception of the response, + * we submit GOAWAY and close the session. + */ +static int on_stream_close_callback(nghttp2_session *session, int32_t stream_id, + uint32_t error_code, void *user_data) { + struct Request *req; + (void)error_code; + (void)user_data; + + req = nghttp2_session_get_stream_user_data(session, stream_id); + if (req) { + int rv; + rv = nghttp2_session_terminate_session(session, NGHTTP2_NO_ERROR); + + if (rv != 0) { + diec("nghttp2_session_terminate_session", rv); + } + } + return 0; +} + +/* + * The implementation of nghttp2_on_data_chunk_recv_callback type. We + * use this function to print the received response body. + */ +static int on_data_chunk_recv_callback(nghttp2_session *session, uint8_t flags, + int32_t stream_id, const uint8_t *data, + size_t len, void *user_data) { + struct Request *req; + (void)flags; + (void)user_data; + + req = nghttp2_session_get_stream_user_data(session, stream_id); + if (req) { + printf("[INFO] C <---------------------------- S (DATA chunk)\n" + "%lu bytes\n", + (unsigned long int)len); + fwrite(data, 1, len, stdout); + printf("\n"); + } + return 0; +} + +/* + * Setup callback functions. nghttp2 API offers many callback + * functions, but most of them are optional. The send_callback is + * always required. Since we use nghttp2_session_recv(), the + * recv_callback is also required. + */ +static void setup_nghttp2_callbacks(nghttp2_session_callbacks *callbacks) { + nghttp2_session_callbacks_set_send_callback(callbacks, send_callback); + + nghttp2_session_callbacks_set_recv_callback(callbacks, recv_callback); + + nghttp2_session_callbacks_set_on_frame_send_callback(callbacks, + on_frame_send_callback); + + nghttp2_session_callbacks_set_on_frame_recv_callback(callbacks, + on_frame_recv_callback); + + nghttp2_session_callbacks_set_on_stream_close_callback( + callbacks, on_stream_close_callback); + + nghttp2_session_callbacks_set_on_data_chunk_recv_callback( + callbacks, on_data_chunk_recv_callback); +} + +/* + * Setup SSL/TLS context. + */ +static void init_ssl_ctx(SSL_CTX *ssl_ctx) { + /* Disable SSLv2 and enable all workarounds for buggy servers */ + SSL_CTX_set_options(ssl_ctx, SSL_OP_ALL | SSL_OP_NO_SSLv2); + SSL_CTX_set_mode(ssl_ctx, SSL_MODE_AUTO_RETRY); + SSL_CTX_set_mode(ssl_ctx, SSL_MODE_RELEASE_BUFFERS); + + SSL_CTX_set_alpn_protos(ssl_ctx, (const unsigned char *)"\x02h2", 3); +} + +static void ssl_handshake(SSL *ssl, int fd) { + int rv; + if (SSL_set_fd(ssl, fd) == 0) { + dief("SSL_set_fd", ERR_error_string(ERR_get_error(), NULL)); + } + ERR_clear_error(); + rv = SSL_connect(ssl); + if (rv <= 0) { + dief("SSL_connect", ERR_error_string(ERR_get_error(), NULL)); + } +} + +/* + * Connects to the host |host| and port |port|. This function returns + * the file descriptor of the client socket. + */ +static int connect_to(const char *host, uint16_t port) { + struct addrinfo hints; + int fd = -1; + int rv; + char service[NI_MAXSERV]; + struct addrinfo *res, *rp; + snprintf(service, sizeof(service), "%u", port); + memset(&hints, 0, sizeof(struct addrinfo)); + hints.ai_family = AF_UNSPEC; + hints.ai_socktype = SOCK_STREAM; + rv = getaddrinfo(host, service, &hints, &res); + if (rv != 0) { + dief("getaddrinfo", gai_strerror(rv)); + } + for (rp = res; rp; rp = rp->ai_next) { + fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol); + if (fd == -1) { + continue; + } + while ((rv = connect(fd, rp->ai_addr, rp->ai_addrlen)) == -1 && + errno == EINTR) + ; + if (rv == 0) { + break; + } + close(fd); + fd = -1; + } + freeaddrinfo(res); + return fd; +} + +static void make_non_block(int fd) { + int flags, rv; + while ((flags = fcntl(fd, F_GETFL, 0)) == -1 && errno == EINTR) + ; + if (flags == -1) { + dief("fcntl", strerror(errno)); + } + while ((rv = fcntl(fd, F_SETFL, flags | O_NONBLOCK)) == -1 && errno == EINTR) + ; + if (rv == -1) { + dief("fcntl", strerror(errno)); + } +} + +static void set_tcp_nodelay(int fd) { + int val = 1; + int rv; + rv = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &val, (socklen_t)sizeof(val)); + if (rv == -1) { + dief("setsockopt", strerror(errno)); + } +} + +/* + * Update |pollfd| based on the state of |connection|. + */ +static void ctl_poll(struct pollfd *pollfd, struct Connection *connection) { + pollfd->events = 0; + if (nghttp2_session_want_read(connection->session) || + connection->want_io == WANT_READ) { + pollfd->events |= POLLIN; + } + if (nghttp2_session_want_write(connection->session) || + connection->want_io == WANT_WRITE) { + pollfd->events |= POLLOUT; + } +} + +/* + * Submits the request |req| to the connection |connection|. This + * function does not send packets; just append the request to the + * internal queue in |connection->session|. + */ +static void submit_request(struct Connection *connection, struct Request *req) { + int32_t stream_id; + /* Make sure that the last item is NULL */ + const nghttp2_nv nva[] = {MAKE_NV(":method", "GET"), + MAKE_NV_CS(":path", req->path), + MAKE_NV(":scheme", "https"), + MAKE_NV_CS(":authority", req->hostport), + MAKE_NV("accept", "*/*"), + MAKE_NV("user-agent", "nghttp2/" NGHTTP2_VERSION)}; + + stream_id = nghttp2_submit_request(connection->session, NULL, nva, + sizeof(nva) / sizeof(nva[0]), NULL, req); + + if (stream_id < 0) { + diec("nghttp2_submit_request", stream_id); + } + + req->stream_id = stream_id; + printf("[INFO] Stream ID = %d\n", stream_id); +} + +/* + * Performs the network I/O. + */ +static void exec_io(struct Connection *connection) { + int rv; + rv = nghttp2_session_recv(connection->session); + if (rv != 0) { + diec("nghttp2_session_recv", rv); + } + rv = nghttp2_session_send(connection->session); + if (rv != 0) { + diec("nghttp2_session_send", rv); + } +} + +static void request_init(struct Request *req, const struct URI *uri) { + req->host = strcopy(uri->host, uri->hostlen); + req->port = uri->port; + req->path = strcopy(uri->path, uri->pathlen); + req->hostport = strcopy(uri->hostport, uri->hostportlen); + req->stream_id = -1; +} + +static void request_free(struct Request *req) { + free(req->host); + free(req->path); + free(req->hostport); +} + +/* + * Fetches the resource denoted by |uri|. + */ +static void fetch_uri(const struct URI *uri) { + nghttp2_session_callbacks *callbacks; + int fd; + SSL_CTX *ssl_ctx; + SSL *ssl; + struct Request req; + struct Connection connection; + int rv; + nfds_t npollfds = 1; + struct pollfd pollfds[1]; + + request_init(&req, uri); + + /* Establish connection and setup SSL */ + fd = connect_to(req.host, req.port); + if (fd == -1) { + die("Could not open file descriptor"); + } + ssl_ctx = SSL_CTX_new(TLS_client_method()); + if (ssl_ctx == NULL) { + dief("SSL_CTX_new", ERR_error_string(ERR_get_error(), NULL)); + } + init_ssl_ctx(ssl_ctx); + ssl = SSL_new(ssl_ctx); + if (ssl == NULL) { + dief("SSL_new", ERR_error_string(ERR_get_error(), NULL)); + } + /* To simplify the program, we perform SSL/TLS handshake in blocking + I/O. */ + ssl_handshake(ssl, fd); + + connection.ssl = ssl; + connection.want_io = IO_NONE; + + /* Here make file descriptor non-block */ + make_non_block(fd); + set_tcp_nodelay(fd); + + printf("[INFO] SSL/TLS handshake completed\n"); + + rv = nghttp2_session_callbacks_new(&callbacks); + + if (rv != 0) { + diec("nghttp2_session_callbacks_new", rv); + } + + setup_nghttp2_callbacks(callbacks); + + rv = nghttp2_session_client_new(&connection.session, callbacks, &connection); + + nghttp2_session_callbacks_del(callbacks); + + if (rv != 0) { + diec("nghttp2_session_client_new", rv); + } + + rv = nghttp2_submit_settings(connection.session, NGHTTP2_FLAG_NONE, NULL, 0); + + if (rv != 0) { + diec("nghttp2_submit_settings", rv); + } + + /* Submit the HTTP request to the outbound queue. */ + submit_request(&connection, &req); + + pollfds[0].fd = fd; + ctl_poll(pollfds, &connection); + + /* Event loop */ + while (nghttp2_session_want_read(connection.session) || + nghttp2_session_want_write(connection.session)) { + int nfds = poll(pollfds, npollfds, -1); + if (nfds == -1) { + dief("poll", strerror(errno)); + } + if (pollfds[0].revents & (POLLIN | POLLOUT)) { + exec_io(&connection); + } + if ((pollfds[0].revents & POLLHUP) || (pollfds[0].revents & POLLERR)) { + die("Connection error"); + } + ctl_poll(pollfds, &connection); + } + + /* Resource cleanup */ + nghttp2_session_del(connection.session); + SSL_shutdown(ssl); + SSL_free(ssl); + SSL_CTX_free(ssl_ctx); + shutdown(fd, SHUT_WR); + close(fd); + request_free(&req); +} + +static int parse_uri(struct URI *res, const char *uri) { + /* We only interested in https */ + size_t len, i, offset; + int ipv6addr = 0; + memset(res, 0, sizeof(struct URI)); + len = strlen(uri); + if (len < 9 || memcmp("https://", uri, 8) != 0) { + return -1; + } + offset = 8; + res->host = res->hostport = &uri[offset]; + res->hostlen = 0; + if (uri[offset] == '[') { + /* IPv6 literal address */ + ++offset; + ++res->host; + ipv6addr = 1; + for (i = offset; i < len; ++i) { + if (uri[i] == ']') { + res->hostlen = i - offset; + offset = i + 1; + break; + } + } + } else { + const char delims[] = ":/?#"; + for (i = offset; i < len; ++i) { + if (strchr(delims, uri[i]) != NULL) { + break; + } + } + res->hostlen = i - offset; + offset = i; + } + if (res->hostlen == 0) { + return -1; + } + /* Assuming https */ + res->port = 443; + if (offset < len) { + if (uri[offset] == ':') { + /* port */ + const char delims[] = "/?#"; + int port = 0; + ++offset; + for (i = offset; i < len; ++i) { + if (strchr(delims, uri[i]) != NULL) { + break; + } + if ('0' <= uri[i] && uri[i] <= '9') { + port *= 10; + port += uri[i] - '0'; + if (port > 65535) { + return -1; + } + } else { + return -1; + } + } + if (port == 0) { + return -1; + } + offset = i; + res->port = (uint16_t)port; + } + } + res->hostportlen = (size_t)(uri + offset + ipv6addr - res->host); + for (i = offset; i < len; ++i) { + if (uri[i] == '#') { + break; + } + } + if (i - offset == 0) { + res->path = "/"; + res->pathlen = 1; + } else { + res->path = &uri[offset]; + res->pathlen = i - offset; + } + return 0; +} + +int main(int argc, char **argv) { + struct URI uri; + struct sigaction act; + int rv; + + if (argc < 2) { + die("Specify a https URI"); + } + + memset(&act, 0, sizeof(struct sigaction)); + act.sa_handler = SIG_IGN; + sigaction(SIGPIPE, &act, 0); + + rv = parse_uri(&uri, argv[1]); + if (rv != 0) { + die("parse_uri failed"); + } + fetch_uri(&uri); + return EXIT_SUCCESS; +} diff --git a/examples/deflate.c b/examples/deflate.c new file mode 100644 index 0000000..df1cb92 --- /dev/null +++ b/examples/deflate.c @@ -0,0 +1,206 @@ +/* + * nghttp2 - HTTP/2 C Library + * + * Copyright (c) 2014 Tatsuhiro Tsujikawa + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE + * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION + * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif /* !HAVE_CONFIG_H */ + +#include <stdio.h> +#include <string.h> + +#include <nghttp2/nghttp2.h> + +#define MAKE_NV(K, V) \ + { \ + (uint8_t *)K, (uint8_t *)V, sizeof(K) - 1, sizeof(V) - 1, \ + NGHTTP2_NV_FLAG_NONE \ + } + +static void deflate(nghttp2_hd_deflater *deflater, + nghttp2_hd_inflater *inflater, const nghttp2_nv *const nva, + size_t nvlen); + +static int inflate_header_block(nghttp2_hd_inflater *inflater, uint8_t *in, + size_t inlen, int final); + +int main(void) { + int rv; + nghttp2_hd_deflater *deflater; + nghttp2_hd_inflater *inflater; + /* Define 1st header set. This is looks like a HTTP request. */ + nghttp2_nv nva1[] = { + MAKE_NV(":scheme", "https"), MAKE_NV(":authority", "example.org"), + MAKE_NV(":path", "/"), MAKE_NV("user-agent", "libnghttp2"), + MAKE_NV("accept-encoding", "gzip, deflate")}; + /* Define 2nd header set */ + nghttp2_nv nva2[] = {MAKE_NV(":scheme", "https"), + MAKE_NV(":authority", "example.org"), + MAKE_NV(":path", "/stylesheet/style.css"), + MAKE_NV("user-agent", "libnghttp2"), + MAKE_NV("accept-encoding", "gzip, deflate"), + MAKE_NV("referer", "https://example.org")}; + + rv = nghttp2_hd_deflate_new(&deflater, 4096); + + if (rv != 0) { + fprintf(stderr, "nghttp2_hd_deflate_init failed with error: %s\n", + nghttp2_strerror(rv)); + exit(EXIT_FAILURE); + } + + rv = nghttp2_hd_inflate_new(&inflater); + + if (rv != 0) { + fprintf(stderr, "nghttp2_hd_inflate_init failed with error: %s\n", + nghttp2_strerror(rv)); + exit(EXIT_FAILURE); + } + + /* Encode and decode 1st header set */ + deflate(deflater, inflater, nva1, sizeof(nva1) / sizeof(nva1[0])); + + /* Encode and decode 2nd header set, using differential encoding + using state after encoding 1st header set. */ + deflate(deflater, inflater, nva2, sizeof(nva2) / sizeof(nva2[0])); + + nghttp2_hd_inflate_del(inflater); + nghttp2_hd_deflate_del(deflater); + + return 0; +} + +static void deflate(nghttp2_hd_deflater *deflater, + nghttp2_hd_inflater *inflater, const nghttp2_nv *const nva, + size_t nvlen) { + ssize_t rv; + uint8_t *buf; + size_t buflen; + size_t outlen; + size_t i; + size_t sum; + + sum = 0; + + for (i = 0; i < nvlen; ++i) { + sum += nva[i].namelen + nva[i].valuelen; + } + + printf("Input (%zu byte(s)):\n\n", sum); + + for (i = 0; i < nvlen; ++i) { + fwrite(nva[i].name, 1, nva[i].namelen, stdout); + printf(": "); + fwrite(nva[i].value, 1, nva[i].valuelen, stdout); + printf("\n"); + } + + buflen = nghttp2_hd_deflate_bound(deflater, nva, nvlen); + buf = malloc(buflen); + + rv = nghttp2_hd_deflate_hd(deflater, buf, buflen, nva, nvlen); + + if (rv < 0) { + fprintf(stderr, "nghttp2_hd_deflate_hd() failed with error: %s\n", + nghttp2_strerror((int)rv)); + + free(buf); + + exit(EXIT_FAILURE); + } + + outlen = (size_t)rv; + + printf("\nDeflate (%zu byte(s), ratio %.02f):\n\n", outlen, + sum == 0 ? 0 : (double)outlen / (double)sum); + + for (i = 0; i < outlen; ++i) { + if ((i & 0x0fu) == 0) { + printf("%08zX: ", i); + } + + printf("%02X ", buf[i]); + + if (((i + 1) & 0x0fu) == 0) { + printf("\n"); + } + } + + printf("\n\nInflate:\n\n"); + + /* We pass 1 to final parameter, because buf contains whole deflated + header data. */ + rv = inflate_header_block(inflater, buf, outlen, 1); + + if (rv != 0) { + free(buf); + + exit(EXIT_FAILURE); + } + + printf("\n-----------------------------------------------------------" + "--------------------\n"); + + free(buf); +} + +int inflate_header_block(nghttp2_hd_inflater *inflater, uint8_t *in, + size_t inlen, int final) { + ssize_t rv; + + for (;;) { + nghttp2_nv nv; + int inflate_flags = 0; + size_t proclen; + + rv = nghttp2_hd_inflate_hd(inflater, &nv, &inflate_flags, in, inlen, final); + + if (rv < 0) { + fprintf(stderr, "inflate failed with error code %zd", rv); + return -1; + } + + proclen = (size_t)rv; + + in += proclen; + inlen -= proclen; + + if (inflate_flags & NGHTTP2_HD_INFLATE_EMIT) { + fwrite(nv.name, 1, nv.namelen, stderr); + fprintf(stderr, ": "); + fwrite(nv.value, 1, nv.valuelen, stderr); + fprintf(stderr, "\n"); + } + + if (inflate_flags & NGHTTP2_HD_INFLATE_FINAL) { + nghttp2_hd_inflate_end_headers(inflater); + break; + } + + if ((inflate_flags & NGHTTP2_HD_INFLATE_EMIT) == 0 && inlen == 0) { + break; + } + } + + return 0; +} diff --git a/examples/libevent-client.c b/examples/libevent-client.c new file mode 100644 index 0000000..0e1c14a --- /dev/null +++ b/examples/libevent-client.c @@ -0,0 +1,595 @@ +/* + * nghttp2 - HTTP/2 C Library + * + * Copyright (c) 2013 Tatsuhiro Tsujikawa + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE + * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION + * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ +#ifdef __sgi +# include <string.h> +# define errx(exitcode, format, args...) \ + { \ + warnx(format, ##args); \ + exit(exitcode); \ + } +# define warnx(format, args...) fprintf(stderr, format "\n", ##args) +char *strndup(const char *s, size_t size); +#endif + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif /* HAVE_CONFIG_H */ + +#include <sys/types.h> +#ifdef HAVE_UNISTD_H +# include <unistd.h> +#endif /* HAVE_UNISTD_H */ +#ifdef HAVE_SYS_SOCKET_H +# include <sys/socket.h> +#endif /* HAVE_SYS_SOCKET_H */ +#ifdef HAVE_NETINET_IN_H +# include <netinet/in.h> +#endif /* HAVE_NETINET_IN_H */ +#include <netinet/tcp.h> +#ifndef __sgi +# include <err.h> +#endif +#include <signal.h> +#include <string.h> + +#include <openssl/ssl.h> +#include <openssl/err.h> +#include <openssl/conf.h> + +#include <event.h> +#include <event2/event.h> +#include <event2/bufferevent_ssl.h> +#include <event2/dns.h> + +#include <nghttp2/nghttp2.h> + +#include "url-parser/url_parser.h" + +#define ARRLEN(x) (sizeof(x) / sizeof(x[0])) + +typedef struct { + /* The NULL-terminated URI string to retrieve. */ + const char *uri; + /* Parsed result of the |uri| */ + struct http_parser_url *u; + /* The authority portion of the |uri|, not NULL-terminated */ + char *authority; + /* The path portion of the |uri|, including query, not + NULL-terminated */ + char *path; + /* The length of the |authority| */ + size_t authoritylen; + /* The length of the |path| */ + size_t pathlen; + /* The stream ID of this stream */ + int32_t stream_id; +} http2_stream_data; + +typedef struct { + nghttp2_session *session; + struct evdns_base *dnsbase; + struct bufferevent *bev; + http2_stream_data *stream_data; +} http2_session_data; + +static http2_stream_data *create_http2_stream_data(const char *uri, + struct http_parser_url *u) { + /* MAX 5 digits (max 65535) + 1 ':' + 1 NULL (because of snprintf) */ + size_t extra = 7; + http2_stream_data *stream_data = malloc(sizeof(http2_stream_data)); + + stream_data->uri = uri; + stream_data->u = u; + stream_data->stream_id = -1; + + stream_data->authoritylen = u->field_data[UF_HOST].len; + stream_data->authority = malloc(stream_data->authoritylen + extra); + memcpy(stream_data->authority, &uri[u->field_data[UF_HOST].off], + u->field_data[UF_HOST].len); + if (u->field_set & (1 << UF_PORT)) { + stream_data->authoritylen += + (size_t)snprintf(stream_data->authority + u->field_data[UF_HOST].len, + extra, ":%u", u->port); + } + + /* If we don't have path in URI, we use "/" as path. */ + stream_data->pathlen = 1; + if (u->field_set & (1 << UF_PATH)) { + stream_data->pathlen = u->field_data[UF_PATH].len; + } + if (u->field_set & (1 << UF_QUERY)) { + /* +1 for '?' character */ + stream_data->pathlen += (size_t)(u->field_data[UF_QUERY].len + 1); + } + + stream_data->path = malloc(stream_data->pathlen); + if (u->field_set & (1 << UF_PATH)) { + memcpy(stream_data->path, &uri[u->field_data[UF_PATH].off], + u->field_data[UF_PATH].len); + } else { + stream_data->path[0] = '/'; + } + if (u->field_set & (1 << UF_QUERY)) { + stream_data->path[stream_data->pathlen - u->field_data[UF_QUERY].len - 1] = + '?'; + memcpy(stream_data->path + stream_data->pathlen - + u->field_data[UF_QUERY].len, + &uri[u->field_data[UF_QUERY].off], u->field_data[UF_QUERY].len); + } + + return stream_data; +} + +static void delete_http2_stream_data(http2_stream_data *stream_data) { + free(stream_data->path); + free(stream_data->authority); + free(stream_data); +} + +/* Initializes |session_data| */ +static http2_session_data * +create_http2_session_data(struct event_base *evbase) { + http2_session_data *session_data = malloc(sizeof(http2_session_data)); + + memset(session_data, 0, sizeof(http2_session_data)); + session_data->dnsbase = evdns_base_new(evbase, 1); + return session_data; +} + +static void delete_http2_session_data(http2_session_data *session_data) { + SSL *ssl = bufferevent_openssl_get_ssl(session_data->bev); + + if (ssl) { + SSL_shutdown(ssl); + } + bufferevent_free(session_data->bev); + session_data->bev = NULL; + evdns_base_free(session_data->dnsbase, 1); + session_data->dnsbase = NULL; + nghttp2_session_del(session_data->session); + session_data->session = NULL; + if (session_data->stream_data) { + delete_http2_stream_data(session_data->stream_data); + session_data->stream_data = NULL; + } + free(session_data); +} + +static void print_header(FILE *f, const uint8_t *name, size_t namelen, + const uint8_t *value, size_t valuelen) { + fwrite(name, 1, namelen, f); + fprintf(f, ": "); + fwrite(value, 1, valuelen, f); + fprintf(f, "\n"); +} + +/* Print HTTP headers to |f|. Please note that this function does not + take into account that header name and value are sequence of + octets, therefore they may contain non-printable characters. */ +static void print_headers(FILE *f, nghttp2_nv *nva, size_t nvlen) { + size_t i; + for (i = 0; i < nvlen; ++i) { + print_header(f, nva[i].name, nva[i].namelen, nva[i].value, nva[i].valuelen); + } + fprintf(f, "\n"); +} + +/* nghttp2_send_callback. Here we transmit the |data|, |length| bytes, + to the network. Because we are using libevent bufferevent, we just + write those bytes into bufferevent buffer. */ +static ssize_t send_callback(nghttp2_session *session, const uint8_t *data, + size_t length, int flags, void *user_data) { + http2_session_data *session_data = (http2_session_data *)user_data; + struct bufferevent *bev = session_data->bev; + (void)session; + (void)flags; + + bufferevent_write(bev, data, length); + return (ssize_t)length; +} + +/* nghttp2_on_header_callback: Called when nghttp2 library emits + single header name/value pair. */ +static int on_header_callback(nghttp2_session *session, + const nghttp2_frame *frame, const uint8_t *name, + size_t namelen, const uint8_t *value, + size_t valuelen, uint8_t flags, void *user_data) { + http2_session_data *session_data = (http2_session_data *)user_data; + (void)session; + (void)flags; + + switch (frame->hd.type) { + case NGHTTP2_HEADERS: + if (frame->headers.cat == NGHTTP2_HCAT_RESPONSE && + session_data->stream_data->stream_id == frame->hd.stream_id) { + /* Print response headers for the initiated request. */ + print_header(stderr, name, namelen, value, valuelen); + break; + } + } + return 0; +} + +/* nghttp2_on_begin_headers_callback: Called when nghttp2 library gets + started to receive header block. */ +static int on_begin_headers_callback(nghttp2_session *session, + const nghttp2_frame *frame, + void *user_data) { + http2_session_data *session_data = (http2_session_data *)user_data; + (void)session; + + switch (frame->hd.type) { + case NGHTTP2_HEADERS: + if (frame->headers.cat == NGHTTP2_HCAT_RESPONSE && + session_data->stream_data->stream_id == frame->hd.stream_id) { + fprintf(stderr, "Response headers for stream ID=%d:\n", + frame->hd.stream_id); + } + break; + } + return 0; +} + +/* nghttp2_on_frame_recv_callback: Called when nghttp2 library + received a complete frame from the remote peer. */ +static int on_frame_recv_callback(nghttp2_session *session, + const nghttp2_frame *frame, void *user_data) { + http2_session_data *session_data = (http2_session_data *)user_data; + (void)session; + + switch (frame->hd.type) { + case NGHTTP2_HEADERS: + if (frame->headers.cat == NGHTTP2_HCAT_RESPONSE && + session_data->stream_data->stream_id == frame->hd.stream_id) { + fprintf(stderr, "All headers received\n"); + } + break; + } + return 0; +} + +/* nghttp2_on_data_chunk_recv_callback: Called when DATA frame is + received from the remote peer. In this implementation, if the frame + is meant to the stream we initiated, print the received data in + stdout, so that the user can redirect its output to the file + easily. */ +static int on_data_chunk_recv_callback(nghttp2_session *session, uint8_t flags, + int32_t stream_id, const uint8_t *data, + size_t len, void *user_data) { + http2_session_data *session_data = (http2_session_data *)user_data; + (void)session; + (void)flags; + + if (session_data->stream_data->stream_id == stream_id) { + fwrite(data, 1, len, stdout); + } + return 0; +} + +/* nghttp2_on_stream_close_callback: Called when a stream is about to + closed. This example program only deals with 1 HTTP request (1 + stream), if it is closed, we send GOAWAY and tear down the + session */ +static int on_stream_close_callback(nghttp2_session *session, int32_t stream_id, + uint32_t error_code, void *user_data) { + http2_session_data *session_data = (http2_session_data *)user_data; + int rv; + + if (session_data->stream_data->stream_id == stream_id) { + fprintf(stderr, "Stream %d closed with error_code=%u\n", stream_id, + error_code); + rv = nghttp2_session_terminate_session(session, NGHTTP2_NO_ERROR); + if (rv != 0) { + return NGHTTP2_ERR_CALLBACK_FAILURE; + } + } + return 0; +} + +/* Create SSL_CTX. */ +static SSL_CTX *create_ssl_ctx(void) { + SSL_CTX *ssl_ctx; + ssl_ctx = SSL_CTX_new(TLS_client_method()); + if (!ssl_ctx) { + errx(1, "Could not create SSL/TLS context: %s", + ERR_error_string(ERR_get_error(), NULL)); + } + SSL_CTX_set_options(ssl_ctx, + SSL_OP_ALL | SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 | + SSL_OP_NO_COMPRESSION | + SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION); + + SSL_CTX_set_alpn_protos(ssl_ctx, (const unsigned char *)"\x02h2", 3); + + return ssl_ctx; +} + +/* Create SSL object */ +static SSL *create_ssl(SSL_CTX *ssl_ctx) { + SSL *ssl; + ssl = SSL_new(ssl_ctx); + if (!ssl) { + errx(1, "Could not create SSL/TLS session object: %s", + ERR_error_string(ERR_get_error(), NULL)); + } + return ssl; +} + +static void initialize_nghttp2_session(http2_session_data *session_data) { + nghttp2_session_callbacks *callbacks; + + nghttp2_session_callbacks_new(&callbacks); + + nghttp2_session_callbacks_set_send_callback(callbacks, send_callback); + + nghttp2_session_callbacks_set_on_frame_recv_callback(callbacks, + on_frame_recv_callback); + + nghttp2_session_callbacks_set_on_data_chunk_recv_callback( + callbacks, on_data_chunk_recv_callback); + + nghttp2_session_callbacks_set_on_stream_close_callback( + callbacks, on_stream_close_callback); + + nghttp2_session_callbacks_set_on_header_callback(callbacks, + on_header_callback); + + nghttp2_session_callbacks_set_on_begin_headers_callback( + callbacks, on_begin_headers_callback); + + nghttp2_session_client_new(&session_data->session, callbacks, session_data); + + nghttp2_session_callbacks_del(callbacks); +} + +static void send_client_connection_header(http2_session_data *session_data) { + nghttp2_settings_entry iv[1] = { + {NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS, 100}}; + int rv; + + /* client 24 bytes magic string will be sent by nghttp2 library */ + rv = nghttp2_submit_settings(session_data->session, NGHTTP2_FLAG_NONE, iv, + ARRLEN(iv)); + if (rv != 0) { + errx(1, "Could not submit SETTINGS: %s", nghttp2_strerror(rv)); + } +} + +#define MAKE_NV(NAME, VALUE, VALUELEN) \ + { \ + (uint8_t *)NAME, (uint8_t *)VALUE, sizeof(NAME) - 1, VALUELEN, \ + NGHTTP2_NV_FLAG_NONE \ + } + +#define MAKE_NV2(NAME, VALUE) \ + { \ + (uint8_t *)NAME, (uint8_t *)VALUE, sizeof(NAME) - 1, sizeof(VALUE) - 1, \ + NGHTTP2_NV_FLAG_NONE \ + } + +/* Send HTTP request to the remote peer */ +static void submit_request(http2_session_data *session_data) { + int32_t stream_id; + http2_stream_data *stream_data = session_data->stream_data; + const char *uri = stream_data->uri; + const struct http_parser_url *u = stream_data->u; + nghttp2_nv hdrs[] = { + MAKE_NV2(":method", "GET"), + MAKE_NV(":scheme", &uri[u->field_data[UF_SCHEMA].off], + u->field_data[UF_SCHEMA].len), + MAKE_NV(":authority", stream_data->authority, stream_data->authoritylen), + MAKE_NV(":path", stream_data->path, stream_data->pathlen)}; + fprintf(stderr, "Request headers:\n"); + print_headers(stderr, hdrs, ARRLEN(hdrs)); + stream_id = nghttp2_submit_request(session_data->session, NULL, hdrs, + ARRLEN(hdrs), NULL, stream_data); + if (stream_id < 0) { + errx(1, "Could not submit HTTP request: %s", nghttp2_strerror(stream_id)); + } + + stream_data->stream_id = stream_id; +} + +/* Serialize the frame and send (or buffer) the data to + bufferevent. */ +static int session_send(http2_session_data *session_data) { + int rv; + + rv = nghttp2_session_send(session_data->session); + if (rv != 0) { + warnx("Fatal error: %s", nghttp2_strerror(rv)); + return -1; + } + return 0; +} + +/* readcb for bufferevent. Here we get the data from the input buffer + of bufferevent and feed them to nghttp2 library. This may invoke + nghttp2 callbacks. It may also queues the frame in nghttp2 session + context. To send them, we call session_send() in the end. */ +static void readcb(struct bufferevent *bev, void *ptr) { + http2_session_data *session_data = (http2_session_data *)ptr; + ssize_t readlen; + struct evbuffer *input = bufferevent_get_input(bev); + size_t datalen = evbuffer_get_length(input); + unsigned char *data = evbuffer_pullup(input, -1); + + readlen = nghttp2_session_mem_recv(session_data->session, data, datalen); + if (readlen < 0) { + warnx("Fatal error: %s", nghttp2_strerror((int)readlen)); + delete_http2_session_data(session_data); + return; + } + if (evbuffer_drain(input, (size_t)readlen) != 0) { + warnx("Fatal error: evbuffer_drain failed"); + delete_http2_session_data(session_data); + return; + } + if (session_send(session_data) != 0) { + delete_http2_session_data(session_data); + return; + } +} + +/* writecb for bufferevent. To greaceful shutdown after sending or + receiving GOAWAY, we check the some conditions on the nghttp2 + library and output buffer of bufferevent. If it indicates we have + no business to this session, tear down the connection. */ +static void writecb(struct bufferevent *bev, void *ptr) { + http2_session_data *session_data = (http2_session_data *)ptr; + (void)bev; + + if (nghttp2_session_want_read(session_data->session) == 0 && + nghttp2_session_want_write(session_data->session) == 0 && + evbuffer_get_length(bufferevent_get_output(session_data->bev)) == 0) { + delete_http2_session_data(session_data); + } +} + +/* eventcb for bufferevent. For the purpose of simplicity and + readability of the example program, we omitted the certificate and + peer verification. After SSL/TLS handshake is over, initialize + nghttp2 library session, and send client connection header. Then + send HTTP request. */ +static void eventcb(struct bufferevent *bev, short events, void *ptr) { + http2_session_data *session_data = (http2_session_data *)ptr; + if (events & BEV_EVENT_CONNECTED) { + int fd = bufferevent_getfd(bev); + int val = 1; + const unsigned char *alpn = NULL; + unsigned int alpnlen = 0; + SSL *ssl; + + fprintf(stderr, "Connected\n"); + + ssl = bufferevent_openssl_get_ssl(session_data->bev); + + if (alpn == NULL) { + SSL_get0_alpn_selected(ssl, &alpn, &alpnlen); + } + + if (alpn == NULL || alpnlen != 2 || memcmp("h2", alpn, 2) != 0) { + fprintf(stderr, "h2 is not negotiated\n"); + delete_http2_session_data(session_data); + return; + } + + setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *)&val, sizeof(val)); + initialize_nghttp2_session(session_data); + send_client_connection_header(session_data); + submit_request(session_data); + if (session_send(session_data) != 0) { + delete_http2_session_data(session_data); + } + return; + } + if (events & BEV_EVENT_EOF) { + warnx("Disconnected from the remote host"); + } else if (events & BEV_EVENT_ERROR) { + warnx("Network error"); + } else if (events & BEV_EVENT_TIMEOUT) { + warnx("Timeout"); + } + delete_http2_session_data(session_data); +} + +/* Start connecting to the remote peer |host:port| */ +static void initiate_connection(struct event_base *evbase, SSL_CTX *ssl_ctx, + const char *host, uint16_t port, + http2_session_data *session_data) { + int rv; + struct bufferevent *bev; + SSL *ssl; + + ssl = create_ssl(ssl_ctx); + bev = bufferevent_openssl_socket_new( + evbase, -1, ssl, BUFFEREVENT_SSL_CONNECTING, + BEV_OPT_DEFER_CALLBACKS | BEV_OPT_CLOSE_ON_FREE); + bufferevent_enable(bev, EV_READ | EV_WRITE); + bufferevent_setcb(bev, readcb, writecb, eventcb, session_data); + rv = bufferevent_socket_connect_hostname(bev, session_data->dnsbase, + AF_UNSPEC, host, port); + + if (rv != 0) { + errx(1, "Could not connect to the remote host %s", host); + } + session_data->bev = bev; +} + +/* Get resource denoted by the |uri|. The debug and error messages are + printed in stderr, while the response body is printed in stdout. */ +static void run(const char *uri) { + struct http_parser_url u; + char *host; + uint16_t port; + int rv; + SSL_CTX *ssl_ctx; + struct event_base *evbase; + http2_session_data *session_data; + + /* Parse the |uri| and stores its components in |u| */ + rv = http_parser_parse_url(uri, strlen(uri), 0, &u); + if (rv != 0) { + errx(1, "Could not parse URI %s", uri); + } + host = strndup(&uri[u.field_data[UF_HOST].off], u.field_data[UF_HOST].len); + if (!(u.field_set & (1 << UF_PORT))) { + port = 443; + } else { + port = u.port; + } + + ssl_ctx = create_ssl_ctx(); + + evbase = event_base_new(); + + session_data = create_http2_session_data(evbase); + session_data->stream_data = create_http2_stream_data(uri, &u); + + initiate_connection(evbase, ssl_ctx, host, port, session_data); + free(host); + host = NULL; + + event_base_loop(evbase, 0); + + event_base_free(evbase); + SSL_CTX_free(ssl_ctx); +} + +int main(int argc, char **argv) { + struct sigaction act; + + if (argc < 2) { + fprintf(stderr, "Usage: libevent-client HTTPS_URI\n"); + exit(EXIT_FAILURE); + } + + memset(&act, 0, sizeof(struct sigaction)); + act.sa_handler = SIG_IGN; + sigaction(SIGPIPE, &act, NULL); + + run(argv[1]); + return 0; +} diff --git a/examples/libevent-server.c b/examples/libevent-server.c new file mode 100644 index 0000000..fa45d37 --- /dev/null +++ b/examples/libevent-server.c @@ -0,0 +1,787 @@ +/* + * nghttp2 - HTTP/2 C Library + * + * Copyright (c) 2013 Tatsuhiro Tsujikawa + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE + * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION + * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ +#ifdef __sgi +# define errx(exitcode, format, args...) \ + { \ + warnx(format, ##args); \ + exit(exitcode); \ + } +# define warn(format, args...) warnx(format ": %s", ##args, strerror(errno)) +# define warnx(format, args...) fprintf(stderr, format "\n", ##args) +#endif + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif /* HAVE_CONFIG_H */ + +#include <sys/types.h> +#ifdef HAVE_SYS_SOCKET_H +# include <sys/socket.h> +#endif /* HAVE_SYS_SOCKET_H */ +#ifdef HAVE_NETDB_H +# include <netdb.h> +#endif /* HAVE_NETDB_H */ +#include <signal.h> +#ifdef HAVE_UNISTD_H +# include <unistd.h> +#endif /* HAVE_UNISTD_H */ +#include <sys/stat.h> +#ifdef HAVE_FCNTL_H +# include <fcntl.h> +#endif /* HAVE_FCNTL_H */ +#include <ctype.h> +#ifdef HAVE_NETINET_IN_H +# include <netinet/in.h> +#endif /* HAVE_NETINET_IN_H */ +#include <netinet/tcp.h> +#ifndef __sgi +# include <err.h> +#endif +#include <string.h> +#include <errno.h> + +#include <openssl/ssl.h> +#include <openssl/err.h> +#include <openssl/conf.h> + +#include <event.h> +#include <event2/event.h> +#include <event2/bufferevent_ssl.h> +#include <event2/listener.h> + +#include <nghttp2/nghttp2.h> + +#define OUTPUT_WOULDBLOCK_THRESHOLD (1 << 16) + +#define ARRLEN(x) (sizeof(x) / sizeof(x[0])) + +#define MAKE_NV(NAME, VALUE) \ + { \ + (uint8_t *)NAME, (uint8_t *)VALUE, sizeof(NAME) - 1, sizeof(VALUE) - 1, \ + NGHTTP2_NV_FLAG_NONE \ + } + +struct app_context; +typedef struct app_context app_context; + +typedef struct http2_stream_data { + struct http2_stream_data *prev, *next; + char *request_path; + int32_t stream_id; + int fd; +} http2_stream_data; + +typedef struct http2_session_data { + struct http2_stream_data root; + struct bufferevent *bev; + app_context *app_ctx; + nghttp2_session *session; + char *client_addr; +} http2_session_data; + +struct app_context { + SSL_CTX *ssl_ctx; + struct event_base *evbase; +}; + +static int alpn_select_proto_cb(SSL *ssl, const unsigned char **out, + unsigned char *outlen, const unsigned char *in, + unsigned int inlen, void *arg) { + int rv; + (void)ssl; + (void)arg; + + rv = nghttp2_select_alpn(out, outlen, in, inlen); + + if (rv != 1) { + return SSL_TLSEXT_ERR_NOACK; + } + + return SSL_TLSEXT_ERR_OK; +} + +/* Create SSL_CTX. */ +static SSL_CTX *create_ssl_ctx(const char *key_file, const char *cert_file) { + SSL_CTX *ssl_ctx; + + ssl_ctx = SSL_CTX_new(TLS_server_method()); + if (!ssl_ctx) { + errx(1, "Could not create SSL/TLS context: %s", + ERR_error_string(ERR_get_error(), NULL)); + } + SSL_CTX_set_options(ssl_ctx, + SSL_OP_ALL | SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 | + SSL_OP_NO_COMPRESSION | + SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION); +#if OPENSSL_VERSION_NUMBER >= 0x30000000L + if (SSL_CTX_set1_curves_list(ssl_ctx, "P-256") != 1) { + errx(1, "SSL_CTX_set1_curves_list failed: %s", + ERR_error_string(ERR_get_error(), NULL)); + } +#else /* !(OPENSSL_VERSION_NUMBER >= 0x30000000L) */ + { + EC_KEY *ecdh; + ecdh = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1); + if (!ecdh) { + errx(1, "EC_KEY_new_by_curv_name failed: %s", + ERR_error_string(ERR_get_error(), NULL)); + } + SSL_CTX_set_tmp_ecdh(ssl_ctx, ecdh); + EC_KEY_free(ecdh); + } +#endif /* !(OPENSSL_VERSION_NUMBER >= 0x30000000L) */ + + if (SSL_CTX_use_PrivateKey_file(ssl_ctx, key_file, SSL_FILETYPE_PEM) != 1) { + errx(1, "Could not read private key file %s", key_file); + } + if (SSL_CTX_use_certificate_chain_file(ssl_ctx, cert_file) != 1) { + errx(1, "Could not read certificate file %s", cert_file); + } + + SSL_CTX_set_alpn_select_cb(ssl_ctx, alpn_select_proto_cb, NULL); + + return ssl_ctx; +} + +/* Create SSL object */ +static SSL *create_ssl(SSL_CTX *ssl_ctx) { + SSL *ssl; + ssl = SSL_new(ssl_ctx); + if (!ssl) { + errx(1, "Could not create SSL/TLS session object: %s", + ERR_error_string(ERR_get_error(), NULL)); + } + return ssl; +} + +static void add_stream(http2_session_data *session_data, + http2_stream_data *stream_data) { + stream_data->next = session_data->root.next; + session_data->root.next = stream_data; + stream_data->prev = &session_data->root; + if (stream_data->next) { + stream_data->next->prev = stream_data; + } +} + +static void remove_stream(http2_session_data *session_data, + http2_stream_data *stream_data) { + (void)session_data; + + stream_data->prev->next = stream_data->next; + if (stream_data->next) { + stream_data->next->prev = stream_data->prev; + } +} + +static http2_stream_data * +create_http2_stream_data(http2_session_data *session_data, int32_t stream_id) { + http2_stream_data *stream_data; + stream_data = malloc(sizeof(http2_stream_data)); + memset(stream_data, 0, sizeof(http2_stream_data)); + stream_data->stream_id = stream_id; + stream_data->fd = -1; + + add_stream(session_data, stream_data); + return stream_data; +} + +static void delete_http2_stream_data(http2_stream_data *stream_data) { + if (stream_data->fd != -1) { + close(stream_data->fd); + } + free(stream_data->request_path); + free(stream_data); +} + +static http2_session_data *create_http2_session_data(app_context *app_ctx, + int fd, + struct sockaddr *addr, + int addrlen) { + int rv; + http2_session_data *session_data; + SSL *ssl; + char host[NI_MAXHOST]; + int val = 1; + + ssl = create_ssl(app_ctx->ssl_ctx); + session_data = malloc(sizeof(http2_session_data)); + memset(session_data, 0, sizeof(http2_session_data)); + session_data->app_ctx = app_ctx; + setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *)&val, sizeof(val)); + session_data->bev = bufferevent_openssl_socket_new( + app_ctx->evbase, fd, ssl, BUFFEREVENT_SSL_ACCEPTING, + BEV_OPT_CLOSE_ON_FREE | BEV_OPT_DEFER_CALLBACKS); + bufferevent_enable(session_data->bev, EV_READ | EV_WRITE); + rv = getnameinfo(addr, (socklen_t)addrlen, host, sizeof(host), NULL, 0, + NI_NUMERICHOST); + if (rv != 0) { + session_data->client_addr = strdup("(unknown)"); + } else { + session_data->client_addr = strdup(host); + } + + return session_data; +} + +static void delete_http2_session_data(http2_session_data *session_data) { + http2_stream_data *stream_data; + SSL *ssl = bufferevent_openssl_get_ssl(session_data->bev); + fprintf(stderr, "%s disconnected\n", session_data->client_addr); + if (ssl) { + SSL_shutdown(ssl); + } + bufferevent_free(session_data->bev); + nghttp2_session_del(session_data->session); + for (stream_data = session_data->root.next; stream_data;) { + http2_stream_data *next = stream_data->next; + delete_http2_stream_data(stream_data); + stream_data = next; + } + free(session_data->client_addr); + free(session_data); +} + +/* Serialize the frame and send (or buffer) the data to + bufferevent. */ +static int session_send(http2_session_data *session_data) { + int rv; + rv = nghttp2_session_send(session_data->session); + if (rv != 0) { + warnx("Fatal error: %s", nghttp2_strerror(rv)); + return -1; + } + return 0; +} + +/* Read the data in the bufferevent and feed them into nghttp2 library + function. Invocation of nghttp2_session_mem_recv() may make + additional pending frames, so call session_send() at the end of the + function. */ +static int session_recv(http2_session_data *session_data) { + ssize_t readlen; + struct evbuffer *input = bufferevent_get_input(session_data->bev); + size_t datalen = evbuffer_get_length(input); + unsigned char *data = evbuffer_pullup(input, -1); + + readlen = nghttp2_session_mem_recv(session_data->session, data, datalen); + if (readlen < 0) { + warnx("Fatal error: %s", nghttp2_strerror((int)readlen)); + return -1; + } + if (evbuffer_drain(input, (size_t)readlen) != 0) { + warnx("Fatal error: evbuffer_drain failed"); + return -1; + } + if (session_send(session_data) != 0) { + return -1; + } + return 0; +} + +static ssize_t send_callback(nghttp2_session *session, const uint8_t *data, + size_t length, int flags, void *user_data) { + http2_session_data *session_data = (http2_session_data *)user_data; + struct bufferevent *bev = session_data->bev; + (void)session; + (void)flags; + + /* Avoid excessive buffering in server side. */ + if (evbuffer_get_length(bufferevent_get_output(session_data->bev)) >= + OUTPUT_WOULDBLOCK_THRESHOLD) { + return NGHTTP2_ERR_WOULDBLOCK; + } + bufferevent_write(bev, data, length); + return (ssize_t)length; +} + +/* Returns nonzero if the string |s| ends with the substring |sub| */ +static int ends_with(const char *s, const char *sub) { + size_t slen = strlen(s); + size_t sublen = strlen(sub); + if (slen < sublen) { + return 0; + } + return memcmp(s + slen - sublen, sub, sublen) == 0; +} + +/* Returns int value of hex string character |c| */ +static uint8_t hex_to_uint(uint8_t c) { + if ('0' <= c && c <= '9') { + return (uint8_t)(c - '0'); + } + if ('A' <= c && c <= 'F') { + return (uint8_t)(c - 'A' + 10); + } + if ('a' <= c && c <= 'f') { + return (uint8_t)(c - 'a' + 10); + } + return 0; +} + +/* Decodes percent-encoded byte string |value| with length |valuelen| + and returns the decoded byte string in allocated buffer. The return + value is NULL terminated. The caller must free the returned + string. */ +static char *percent_decode(const uint8_t *value, size_t valuelen) { + char *res; + + res = malloc(valuelen + 1); + if (valuelen > 3) { + size_t i, j; + for (i = 0, j = 0; i < valuelen - 2;) { + if (value[i] != '%' || !isxdigit(value[i + 1]) || + !isxdigit(value[i + 2])) { + res[j++] = (char)value[i++]; + continue; + } + res[j++] = + (char)((hex_to_uint(value[i + 1]) << 4) + hex_to_uint(value[i + 2])); + i += 3; + } + memcpy(&res[j], &value[i], 2); + res[j + 2] = '\0'; + } else { + memcpy(res, value, valuelen); + res[valuelen] = '\0'; + } + return res; +} + +static ssize_t file_read_callback(nghttp2_session *session, int32_t stream_id, + uint8_t *buf, size_t length, + uint32_t *data_flags, + nghttp2_data_source *source, + void *user_data) { + int fd = source->fd; + ssize_t r; + (void)session; + (void)stream_id; + (void)user_data; + + while ((r = read(fd, buf, length)) == -1 && errno == EINTR) + ; + if (r == -1) { + return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE; + } + if (r == 0) { + *data_flags |= NGHTTP2_DATA_FLAG_EOF; + } + return r; +} + +static int send_response(nghttp2_session *session, int32_t stream_id, + nghttp2_nv *nva, size_t nvlen, int fd) { + int rv; + nghttp2_data_provider data_prd; + data_prd.source.fd = fd; + data_prd.read_callback = file_read_callback; + + rv = nghttp2_submit_response(session, stream_id, nva, nvlen, &data_prd); + if (rv != 0) { + warnx("Fatal error: %s", nghttp2_strerror(rv)); + return -1; + } + return 0; +} + +static const char ERROR_HTML[] = "<html><head><title>404</title></head>" + "<body><h1>404 Not Found</h1></body></html>"; + +static int error_reply(nghttp2_session *session, + http2_stream_data *stream_data) { + int rv; + ssize_t writelen; + int pipefd[2]; + nghttp2_nv hdrs[] = {MAKE_NV(":status", "404")}; + + rv = pipe(pipefd); + if (rv != 0) { + warn("Could not create pipe"); + rv = nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE, + stream_data->stream_id, + NGHTTP2_INTERNAL_ERROR); + if (rv != 0) { + warnx("Fatal error: %s", nghttp2_strerror(rv)); + return -1; + } + return 0; + } + + writelen = write(pipefd[1], ERROR_HTML, sizeof(ERROR_HTML) - 1); + close(pipefd[1]); + + if (writelen != sizeof(ERROR_HTML) - 1) { + close(pipefd[0]); + return -1; + } + + stream_data->fd = pipefd[0]; + + if (send_response(session, stream_data->stream_id, hdrs, ARRLEN(hdrs), + pipefd[0]) != 0) { + close(pipefd[0]); + return -1; + } + return 0; +} + +/* nghttp2_on_header_callback: Called when nghttp2 library emits + single header name/value pair. */ +static int on_header_callback(nghttp2_session *session, + const nghttp2_frame *frame, const uint8_t *name, + size_t namelen, const uint8_t *value, + size_t valuelen, uint8_t flags, void *user_data) { + http2_stream_data *stream_data; + const char PATH[] = ":path"; + (void)flags; + (void)user_data; + + switch (frame->hd.type) { + case NGHTTP2_HEADERS: + if (frame->headers.cat != NGHTTP2_HCAT_REQUEST) { + break; + } + stream_data = + nghttp2_session_get_stream_user_data(session, frame->hd.stream_id); + if (!stream_data || stream_data->request_path) { + break; + } + if (namelen == sizeof(PATH) - 1 && memcmp(PATH, name, namelen) == 0) { + size_t j; + for (j = 0; j < valuelen && value[j] != '?'; ++j) + ; + stream_data->request_path = percent_decode(value, j); + } + break; + } + return 0; +} + +static int on_begin_headers_callback(nghttp2_session *session, + const nghttp2_frame *frame, + void *user_data) { + http2_session_data *session_data = (http2_session_data *)user_data; + http2_stream_data *stream_data; + + if (frame->hd.type != NGHTTP2_HEADERS || + frame->headers.cat != NGHTTP2_HCAT_REQUEST) { + return 0; + } + stream_data = create_http2_stream_data(session_data, frame->hd.stream_id); + nghttp2_session_set_stream_user_data(session, frame->hd.stream_id, + stream_data); + return 0; +} + +/* Minimum check for directory traversal. Returns nonzero if it is + safe. */ +static int check_path(const char *path) { + /* We don't like '\' in url. */ + return path[0] && path[0] == '/' && strchr(path, '\\') == NULL && + strstr(path, "/../") == NULL && strstr(path, "/./") == NULL && + !ends_with(path, "/..") && !ends_with(path, "/."); +} + +static int on_request_recv(nghttp2_session *session, + http2_session_data *session_data, + http2_stream_data *stream_data) { + int fd; + nghttp2_nv hdrs[] = {MAKE_NV(":status", "200")}; + char *rel_path; + + if (!stream_data->request_path) { + if (error_reply(session, stream_data) != 0) { + return NGHTTP2_ERR_CALLBACK_FAILURE; + } + return 0; + } + fprintf(stderr, "%s GET %s\n", session_data->client_addr, + stream_data->request_path); + if (!check_path(stream_data->request_path)) { + if (error_reply(session, stream_data) != 0) { + return NGHTTP2_ERR_CALLBACK_FAILURE; + } + return 0; + } + for (rel_path = stream_data->request_path; *rel_path == '/'; ++rel_path) + ; + fd = open(rel_path, O_RDONLY); + if (fd == -1) { + if (error_reply(session, stream_data) != 0) { + return NGHTTP2_ERR_CALLBACK_FAILURE; + } + return 0; + } + stream_data->fd = fd; + + if (send_response(session, stream_data->stream_id, hdrs, ARRLEN(hdrs), fd) != + 0) { + close(fd); + return NGHTTP2_ERR_CALLBACK_FAILURE; + } + return 0; +} + +static int on_frame_recv_callback(nghttp2_session *session, + const nghttp2_frame *frame, void *user_data) { + http2_session_data *session_data = (http2_session_data *)user_data; + http2_stream_data *stream_data; + switch (frame->hd.type) { + case NGHTTP2_DATA: + case NGHTTP2_HEADERS: + /* Check that the client request has finished */ + if (frame->hd.flags & NGHTTP2_FLAG_END_STREAM) { + stream_data = + nghttp2_session_get_stream_user_data(session, frame->hd.stream_id); + /* For DATA and HEADERS frame, this callback may be called after + on_stream_close_callback. Check that stream still alive. */ + if (!stream_data) { + return 0; + } + return on_request_recv(session, session_data, stream_data); + } + break; + default: + break; + } + return 0; +} + +static int on_stream_close_callback(nghttp2_session *session, int32_t stream_id, + uint32_t error_code, void *user_data) { + http2_session_data *session_data = (http2_session_data *)user_data; + http2_stream_data *stream_data; + (void)error_code; + + stream_data = nghttp2_session_get_stream_user_data(session, stream_id); + if (!stream_data) { + return 0; + } + remove_stream(session_data, stream_data); + delete_http2_stream_data(stream_data); + return 0; +} + +static void initialize_nghttp2_session(http2_session_data *session_data) { + nghttp2_session_callbacks *callbacks; + + nghttp2_session_callbacks_new(&callbacks); + + nghttp2_session_callbacks_set_send_callback(callbacks, send_callback); + + nghttp2_session_callbacks_set_on_frame_recv_callback(callbacks, + on_frame_recv_callback); + + nghttp2_session_callbacks_set_on_stream_close_callback( + callbacks, on_stream_close_callback); + + nghttp2_session_callbacks_set_on_header_callback(callbacks, + on_header_callback); + + nghttp2_session_callbacks_set_on_begin_headers_callback( + callbacks, on_begin_headers_callback); + + nghttp2_session_server_new(&session_data->session, callbacks, session_data); + + nghttp2_session_callbacks_del(callbacks); +} + +/* Send HTTP/2 client connection header, which includes 24 bytes + magic octets and SETTINGS frame */ +static int send_server_connection_header(http2_session_data *session_data) { + nghttp2_settings_entry iv[1] = { + {NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS, 100}}; + int rv; + + rv = nghttp2_submit_settings(session_data->session, NGHTTP2_FLAG_NONE, iv, + ARRLEN(iv)); + if (rv != 0) { + warnx("Fatal error: %s", nghttp2_strerror(rv)); + return -1; + } + return 0; +} + +/* readcb for bufferevent after client connection header was + checked. */ +static void readcb(struct bufferevent *bev, void *ptr) { + http2_session_data *session_data = (http2_session_data *)ptr; + (void)bev; + + if (session_recv(session_data) != 0) { + delete_http2_session_data(session_data); + return; + } +} + +/* writecb for bufferevent. To greaceful shutdown after sending or + receiving GOAWAY, we check the some conditions on the nghttp2 + library and output buffer of bufferevent. If it indicates we have + no business to this session, tear down the connection. If the + connection is not going to shutdown, we call session_send() to + process pending data in the output buffer. This is necessary + because we have a threshold on the buffer size to avoid too much + buffering. See send_callback(). */ +static void writecb(struct bufferevent *bev, void *ptr) { + http2_session_data *session_data = (http2_session_data *)ptr; + if (evbuffer_get_length(bufferevent_get_output(bev)) > 0) { + return; + } + if (nghttp2_session_want_read(session_data->session) == 0 && + nghttp2_session_want_write(session_data->session) == 0) { + delete_http2_session_data(session_data); + return; + } + if (session_send(session_data) != 0) { + delete_http2_session_data(session_data); + return; + } +} + +/* eventcb for bufferevent */ +static void eventcb(struct bufferevent *bev, short events, void *ptr) { + http2_session_data *session_data = (http2_session_data *)ptr; + if (events & BEV_EVENT_CONNECTED) { + const unsigned char *alpn = NULL; + unsigned int alpnlen = 0; + SSL *ssl; + (void)bev; + + fprintf(stderr, "%s connected\n", session_data->client_addr); + + ssl = bufferevent_openssl_get_ssl(session_data->bev); + + SSL_get0_alpn_selected(ssl, &alpn, &alpnlen); + + if (alpn == NULL || alpnlen != 2 || memcmp("h2", alpn, 2) != 0) { + fprintf(stderr, "%s h2 is not negotiated\n", session_data->client_addr); + delete_http2_session_data(session_data); + return; + } + + initialize_nghttp2_session(session_data); + + if (send_server_connection_header(session_data) != 0 || + session_send(session_data) != 0) { + delete_http2_session_data(session_data); + return; + } + + return; + } + if (events & BEV_EVENT_EOF) { + fprintf(stderr, "%s EOF\n", session_data->client_addr); + } else if (events & BEV_EVENT_ERROR) { + fprintf(stderr, "%s network error\n", session_data->client_addr); + } else if (events & BEV_EVENT_TIMEOUT) { + fprintf(stderr, "%s timeout\n", session_data->client_addr); + } + delete_http2_session_data(session_data); +} + +/* callback for evconnlistener */ +static void acceptcb(struct evconnlistener *listener, int fd, + struct sockaddr *addr, int addrlen, void *arg) { + app_context *app_ctx = (app_context *)arg; + http2_session_data *session_data; + (void)listener; + + session_data = create_http2_session_data(app_ctx, fd, addr, addrlen); + + bufferevent_setcb(session_data->bev, readcb, writecb, eventcb, session_data); +} + +static void start_listen(struct event_base *evbase, const char *service, + app_context *app_ctx) { + int rv; + struct addrinfo hints; + struct addrinfo *res, *rp; + + memset(&hints, 0, sizeof(hints)); + hints.ai_family = AF_UNSPEC; + hints.ai_socktype = SOCK_STREAM; + hints.ai_flags = AI_PASSIVE; +#ifdef AI_ADDRCONFIG + hints.ai_flags |= AI_ADDRCONFIG; +#endif /* AI_ADDRCONFIG */ + + rv = getaddrinfo(NULL, service, &hints, &res); + if (rv != 0) { + errx(1, "Could not resolve server address"); + } + for (rp = res; rp; rp = rp->ai_next) { + struct evconnlistener *listener; + listener = evconnlistener_new_bind( + evbase, acceptcb, app_ctx, LEV_OPT_CLOSE_ON_FREE | LEV_OPT_REUSEABLE, + 16, rp->ai_addr, (int)rp->ai_addrlen); + if (listener) { + freeaddrinfo(res); + + return; + } + } + errx(1, "Could not start listener"); +} + +static void initialize_app_context(app_context *app_ctx, SSL_CTX *ssl_ctx, + struct event_base *evbase) { + memset(app_ctx, 0, sizeof(app_context)); + app_ctx->ssl_ctx = ssl_ctx; + app_ctx->evbase = evbase; +} + +static void run(const char *service, const char *key_file, + const char *cert_file) { + SSL_CTX *ssl_ctx; + app_context app_ctx; + struct event_base *evbase; + + ssl_ctx = create_ssl_ctx(key_file, cert_file); + evbase = event_base_new(); + initialize_app_context(&app_ctx, ssl_ctx, evbase); + start_listen(evbase, service, &app_ctx); + + event_base_loop(evbase, 0); + + event_base_free(evbase); + SSL_CTX_free(ssl_ctx); +} + +int main(int argc, char **argv) { + struct sigaction act; + + if (argc < 4) { + fprintf(stderr, "Usage: libevent-server PORT KEY_FILE CERT_FILE\n"); + exit(EXIT_FAILURE); + } + + memset(&act, 0, sizeof(struct sigaction)); + act.sa_handler = SIG_IGN; + sigaction(SIGPIPE, &act, NULL); + + run(argv[1], argv[2], argv[3]); + return 0; +} |