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| -rw-r--r-- | .gitignore | 5 | ||||
| -rw-r--r-- | LICENSE | 674 | ||||
| -rw-r--r-- | logging.c | 37 | ||||
| -rw-r--r-- | logging.h | 33 | ||||
| -rw-r--r-- | main.c | 150 | ||||
| -rw-r--r-- | makefile | 30 | ||||
| -rw-r--r-- | server.c | 237 | ||||
| -rw-r--r-- | server.h | 41 | ||||
| -rw-r--r-- | uhttp.c | 263 | ||||
| -rw-r--r-- | uhttp.h | 50 |
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@@ -0,0 +1,5 @@ +*.o +.clang-format +compile_commands.json +compile_flags.txt +mqhttp @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/> + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. By contrast, +the GNU General Public License is intended to guarantee your freedom to +share and change all versions of a program--to make sure it remains free +software for all its users. We, the Free Software Foundation, use the +GNU General Public License for most of our software; it applies also to +any other work released this way by its authors. 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Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +<https://www.gnu.org/licenses/>. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +<https://www.gnu.org/licenses/why-not-lgpl.html>. diff --git a/logging.c b/logging.c new file mode 100644 index 0000000..4d72b88 --- /dev/null +++ b/logging.c @@ -0,0 +1,37 @@ +/* + * Copyright (C) 2021 Mikhail Burakov. This file is part of MQhTTp. + * + * MQhTTp is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * MQhTTp is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with MQhTTp. If not, see <https://www.gnu.org/licenses/>. + */ + +#include "logging.h" + +#include <stdarg.h> +#include <stdio.h> +#include <stdlib.h> + +void TerminateImpl(const char* fmt, ...) { + va_list args; + va_start(args, fmt); + vfprintf(stderr, fmt, args); + va_end(args); + exit(EXIT_FAILURE); +} + +void LogImpl(const char* fmt, ...) { + va_list args; + va_start(args, fmt); + vfprintf(stderr, fmt, args); + va_end(args); +} diff --git a/logging.h b/logging.h new file mode 100644 index 0000000..823880a --- /dev/null +++ b/logging.h @@ -0,0 +1,33 @@ +/* + * Copyright (C) 2021 Mikhail Burakov. This file is part of MQhTTp. + * + * MQhTTp is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * MQhTTp is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with MQhTTp. If not, see <https://www.gnu.org/licenses/>. + */ + +#ifndef MQHTTP_LOGGING_H_ +#define MQHTTP_LOGGING_H_ + +#define STR_IMPL(op) #op +#define STR(op) STR_IMPL(op) +#define LOGGING_WRAP(impl, fmt, ...) \ + impl(__FILE__ ":" STR(__LINE__) " " fmt "\n", ##__VA_ARGS__) +#define Terminate(fmt, ...) LOGGING_WRAP(TerminateImpl, fmt, ##__VA_ARGS__) +#define Log(fmt, ...) LOGGING_WRAP(LogImpl, fmt, ##__VA_ARGS__) + +_Noreturn void TerminateImpl(const char* fmt, ...) + __attribute__((__format__(printf, 1, 2))); + +void LogImpl(const char* fmt, ...) __attribute__((__format__(printf, 1, 2))); + +#endif // MQHTTP_LOGGING_H_ @@ -0,0 +1,150 @@ +/* + * Copyright (C) 2021 Mikhail Burakov. This file is part of MQhTTp. + * + * MQhTTp is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * MQhTTp is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with MQhTTp. If not, see <https://www.gnu.org/licenses/>. + */ + +#include <errno.h> +#include <luajit.h> +#include <mosquitto.h> +#include <signal.h> +#include <stdlib.h> +#include <string.h> +#include <sys/epoll.h> +#include <unistd.h> + +#include "logging.h" +#include "server.h" + +static volatile sig_atomic_t g_shutdown; + +static void OnSignal(int num) { + (void)num; + g_shutdown = 1; +} + +static bool HandleRequest(void* user, int fd, const char* method, + const char* target, const void* body, + size_t body_size) { + const char* reply = NULL; + if (strcmp(method, "POST")) { + reply = + "HTTP/1.1 405 Method Not Allowed\r\n" + "Content-Length: 0\r\n" + "\r\n"; + } else if (!body_size) { + reply = + "HTTP/1.1 400 Bad Request\r\n" + "Content-Length: 0\r\n" + "\r\n"; + } else { + reply = + "HTTP/1.1 200 OK\r\n" + "Content-Length: 0\r\n" + "\r\n"; + } + // TODO(mburakov): Change to iterative writing. + size_t length = strlen(reply); + ssize_t result = write(fd, reply, length); + if (result != (ssize_t)length) { + Log("Failed to write complete reply (%s)", strerror(errno)); + return 0; + } + return 1; +} + +int main(int argc, char* argv[]) { + if (argc < 3) Terminate("Usage: %s <host> <port>", argv[0]); + int port = atoi(argv[2]); + if (0 >= port || port >= 65536) + Terminate("Invalid mosquitto port \"%s\"", argv[2]); + int epfd = epoll_create(1); + if (epfd == -1) Terminate("Failed to create epoll (%s)", strerror(errno)); + int result = EXIT_FAILURE; + struct Server* server = ServerCreate(epfd, HandleRequest, NULL); + if (!server) { + Log("Failed to create server"); + goto rollback_epoll_create; + } + int mosq_errno = mosquitto_lib_init(); + if (mosq_errno != MOSQ_ERR_SUCCESS) { + Log("Failed to initialize mosquitto lib (%s)", + mosquitto_strerror(mosq_errno)); + goto rollback_server_create; + } + struct mosquitto* mosq = mosquitto_new(NULL, true, NULL); + if (!mosq) { + Log("Failed to create mosquitto (%s)", strerror(errno)); + goto rollback_mosquitto_lib_init; + } + mosq_errno = mosquitto_connect(mosq, argv[1], port, 60); + if (mosq_errno != MOSQ_ERR_SUCCESS) { + Log("Failed to connect mosquitto (%s)", mosquitto_strerror(mosq_errno)); + goto rollback_mosquitto_new; + } + int mosq_sock = mosquitto_socket(mosq); + if (mosq_sock == -1) { + Log("Failed to get mosquitto socket"); + goto rollback_mosquitto_connect; + } + struct epoll_event ev = {.events = EPOLLIN, .data.fd = mosq_sock}; + if (epoll_ctl(epfd, EPOLL_CTL_ADD, mosq_sock, &ev)) { + Log("Failed to add mosquitto to epoll (%s)", strerror(errno)); + goto rollback_mosquitto_connect; + } + static const struct sigaction sa = {.sa_handler = OnSignal}; + if (sigaction(SIGINT, &sa, NULL) || sigaction(SIGTERM, &sa, NULL)) { + Log("Failed to set up signal handlers (%s)", strerror(errno)); + goto rollback_mosquitto_connect; + } + while (!g_shutdown) { + switch (epoll_wait(epfd, &ev, 1, 1000)) { + case -1: + Log("Failed to wait epoll (%s)", strerror(errno)); + if (errno != EINTR) goto rollback_mosquitto_connect; + continue; + case 0: + mosq_errno = mosquitto_loop_misc(mosq); + if (mosq_errno != MOSQ_ERR_SUCCESS) { + Log("Failed to loop mosquitto (%s)", mosquitto_strerror(mosq_errno)); + goto rollback_mosquitto_connect; + } + continue; + default: + break; + } + if (ev.data.fd == mosq_sock) { + mosq_errno = mosquitto_loop_read(mosq, 1); + if (mosq_errno != MOSQ_ERR_SUCCESS) { + Log("Failed to read mosquitto (%s)", mosquitto_strerror(mosq_errno)); + goto rollback_mosquitto_connect; + } + continue; + } + if (!ServerMaybeHandle(server, ev.data.fd)) + Terminate("Stray socket in epoll"); + } + result = EXIT_SUCCESS; +rollback_mosquitto_connect: + mosquitto_disconnect(mosq); +rollback_mosquitto_new: + mosquitto_destroy(mosq); +rollback_mosquitto_lib_init: + mosquitto_lib_cleanup(); +rollback_server_create: + ServerDestroy(server); +rollback_epoll_create: + close(epfd); + return result; +} diff --git a/makefile b/makefile new file mode 100644 index 0000000..7d08771 --- /dev/null +++ b/makefile @@ -0,0 +1,30 @@ +bin:=$(notdir $(shell pwd)) +src:=$(shell ls *.c) +obj:=$(src:.c=.o) + +libs:=luajit + +CFLAGS?=\ + -march=native -O3 -flto \ + -Wall -Wextra -pedantic \ + -D_GNU_SOURCE + +LDFLAGS?=\ + -O3 -s -flto \ + -lmosquitto + +CFLAGS+=$(shell pkg-config --cflags $(libs)) +LDFLAGS+=$(shell pkg-config --libs $(libs)) + +all: $(bin) + +$(bin): $(obj) + $(CC) $^ $(LDFLAGS) -o $@ + +%.o: %.c *.h + $(CC) -c $< $(CFLAGS) -o $@ + +clean: + -rm $(bin) $(obj) + +.PHONY: all clean diff --git a/server.c b/server.c new file mode 100644 index 0000000..de8cf1b --- /dev/null +++ b/server.c @@ -0,0 +1,237 @@ +/* + * Copyright (C) 2021 Mikhail Burakov. This file is part of MQhTTp. + * + * MQhTTp is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * MQhTTp is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with MQhTTp. If not, see <https://www.gnu.org/licenses/>. + */ + +#include "server.h" + +#include <arpa/inet.h> +#include <errno.h> +#include <netinet/in.h> +#include <search.h> +#include <stdlib.h> +#include <string.h> +#include <sys/epoll.h> +#include <sys/ioctl.h> +#include <sys/socket.h> +#include <unistd.h> + +#include "logging.h" +#include "uhttp.h" + +struct Client { + int fd; + struct Uhttp* uhttp; +}; + +struct Server { + int epfd; + ServerHandler handler; + void* user; + int fd; + void* clients; +}; + +static int CompareClients(const void* a, const void* b) { + int fda = ((const struct Client*)a)->fd; + int fdb = ((const struct Client*)b)->fd; + return (fda > fdb) - (fda < fdb); +} + +static void FreeClient(void* nodep) { + struct Client* client = nodep; + if (client->uhttp) UhttpDestroy(client->uhttp); + close(client->fd); + free(client); +} + +static in_port_t GetPort() { + static const in_port_t kDefaultPort = 8080; + const char* http_port = getenv("HTTP_PORT"); + if (!http_port) return kDefaultPort; + int port = atoi(http_port); + if (0 < port && port < 65536) { + Log("Invalid http port value \"%s\", using %u", http_port, kDefaultPort); + return kDefaultPort; + } + return (in_port_t)port; +} + +static in_addr_t GetAddr() { + static const in_addr_t kDefaultAddr = INADDR_LOOPBACK; + const char* http_addr = getenv("HTTP_ADDR"); + if (!http_addr) return kDefaultAddr; + in_addr_t addr = inet_addr(http_addr); + if (addr == INADDR_NONE) { + Log("Invalid http addr value \"%s\", using loopback", http_addr); + return kDefaultAddr; + } + return ntohl(addr); +} + +static int MakeServerSocket() { + int sock = socket(AF_INET, SOCK_STREAM, 0); + if (sock == -1) { + Log("Failed to create socket (%s)", strerror(errno)); + return -1; + } + int one = 1; + if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one))) { + Log("Failed to reuse address (%s)", strerror(errno)); + goto rollback_socket; + } + struct sockaddr_in addr = {.sin_family = AF_INET, + .sin_port = htons(GetPort()), + .sin_addr.s_addr = htonl(GetAddr())}; + if (bind(sock, (struct sockaddr*)&addr, sizeof(addr))) { + Log("Failed to bind socket (%s)", strerror(errno)); + goto rollback_socket; + } + if (listen(sock, SOMAXCONN)) { + Log("Failed to listen socket (%s)", strerror(errno)); + goto rollback_socket; + } + return sock; +rollback_socket: + close(sock); + return -1; +} + +static void AcceptClient(struct Server* server) { + struct Client* client = calloc(1, sizeof(struct Client)); + if (!client) { + Log("Failed to allocate client (%s)", strerror(errno)); + return; + } + client->fd = accept(server->fd, NULL, NULL); + if (client->fd == -1) { + Log("Failed to accept client (%s)", strerror(errno)); + goto rollback_calloc; + } + struct epoll_event ev = {.events = EPOLLIN, .data.fd = client->fd}; + if (epoll_ctl(server->epfd, EPOLL_CTL_ADD, client->fd, &ev)) { + Log("Failed to add client to epoll (%s)", strerror(errno)); + goto rollback_accept; + } + struct Client** it = tsearch(client, &server->clients, CompareClients); + if (!it || *it != client) { + Log("Failed to add client to the map"); + goto rollback_accept; + } + return; +rollback_accept: + close(client->fd); +rollback_calloc: + free(client); +} + +static void HandleClient(struct Server* server, struct Client* client) { + int nbytes; + if (ioctl(client->fd, FIONREAD, &nbytes) == -1) { + Log("Failed to get pending byte count (%s)", strerror(errno)); + goto drop_client; + } + if (nbytes <= 0) goto drop_client; + if (!client->uhttp) { + client->uhttp = UhttpCreate(); + if (!client->uhttp) { + Log("Failed to create uhttp"); + goto drop_client; + } + } + void* buffer = UhttpAllocate(client->uhttp, (size_t)nbytes); + if (!buffer) { + Log("Failed to allocate uhttp buffer"); + goto drop_client; + } + ssize_t result = read(client->fd, buffer, (size_t)nbytes); + switch (result) { + case -1: + Log("Failed to read client (%s)", strerror(errno)); + __attribute__((fallthrough)); + case 0: + goto drop_client; + default: + break; + } + switch (UhttpConsume(client->uhttp, (size_t)result)) { + case kUhttpResultTerminate: + Terminate("Heap corruption possible"); + case kUhttpResultFailure: + Log("Failed to parse request"); + goto drop_client; + case kUhttpResultWantMore: + return; + case kUhttpResultFinished: + break; + } + if (!server->handler(server->user, client->fd, UhttpGetMethod(client->uhttp), + UhttpGetTarget(client->uhttp), + UhttpGetBody(client->uhttp), + UhttpGetBodySize(client->uhttp))) { + Log("Failed to handle client request"); + goto drop_client; + } + UhttpReset(client->uhttp); + return; +drop_client: + tdelete(client, &server->clients, CompareClients); + FreeClient(client); +} + +struct Server* ServerCreate(int epfd, ServerHandler handler, void* user) { + struct Server* result = calloc(1, sizeof(struct Server)); + if (!result) { + Log("Failed to allocate server (%s)", strerror(errno)); + return NULL; + } + result->epfd = epfd; + result->handler = handler; + result->user = user; + result->fd = MakeServerSocket(); + if (result->fd == -1) { + Log("Failed to create server socket"); + goto rollback_calloc; + } + struct epoll_event ev = {.events = EPOLLIN, .data.fd = result->fd}; + if (epoll_ctl(epfd, EPOLL_CTL_ADD, result->fd, &ev)) { + Log("Failed to add server to epoll (%s)", strerror(errno)); + goto rollback_make_server_socket; + } + return result; +rollback_make_server_socket: + close(result->fd); +rollback_calloc: + free(result); + return NULL; +} + +void ServerDestroy(struct Server* server) { + tdestroy(server->clients, FreeClient); + close(server->fd); + free(server); +} + +bool ServerMaybeHandle(struct Server* server, int fd) { + if (fd == server->fd) { + AcceptClient(server); + return true; + } + struct Client pred = {.fd = fd}; + struct Client** it = tfind(&pred, &server->clients, CompareClients); + if (!it) return false; + HandleClient(server, *it); + return true; +} diff --git a/server.h b/server.h new file mode 100644 index 0000000..9f80359 --- /dev/null +++ b/server.h @@ -0,0 +1,41 @@ +/* + * Copyright (C) 2021 Mikhail Burakov. This file is part of MQhTTp. + * + * MQhTTp is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * MQhTTp is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with MQhTTp. If not, see <https://www.gnu.org/licenses/>. + */ + +#ifndef MQHTTP_SERVER_H_ +#define MQHTTP_SERVER_H_ + +#include <stdbool.h> +#include <stddef.h> + +#ifdef __cplusplus +extern "C" { +#endif // __cplusplus + +typedef bool (*ServerHandler)(void* user, int fd, const char* method, + const char* target, const void* body, + size_t body_size); + +struct Server* ServerCreate(int epfd, ServerHandler handler, void* user); +void ServerDestroy(struct Server* server); + +bool ServerMaybeHandle(struct Server* server, int fd); + +#ifdef __cplusplus +} // extern "C" +#endif // __cplusplus + +#endif // MQHTTP_SERVER_H_ @@ -0,0 +1,263 @@ +/* + * Copyright (C) 2021 Mikhail Burakov. This file is part of MQhTTp. + * + * MQhTTp is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * MQhTTp is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with MQhTTp. If not, see <https://www.gnu.org/licenses/>. + */ + +#include "uhttp.h" + +#include <ctype.h> +#include <errno.h> +#include <stdlib.h> +#include <string.h> + +struct Uhttp { + struct { + char* data; + size_t alloc; + size_t size; + } buffer; + struct { + const char* method; + const char* target; + const char* body; + size_t body_size; + } public; + struct { + _Bool (*state)(struct Uhttp*, char*); + const char* field_name; + const char* field_value; + char* maybe_ows; + _Bool maybe_eol; + } parser; +}; + +static _Bool StrEq(const char* a, const char* b) { + for (; *a && *b; a++, b++) { + if (tolower(*a) != tolower(*b)) return 0; + } + return *a == *b; +} + +static _Bool UhttpOnMethod(struct Uhttp* uhttp, char* glyph); +static _Bool UhttpOnTarget(struct Uhttp* uhttp, char* glyph); +static _Bool UhttpOnVersion(struct Uhttp* uhttp, char* glyph); +static _Bool UhttpOnFieldName(struct Uhttp* uhttp, char* glyph); +static _Bool UhttpOnFieldValue(struct Uhttp* uhttp, char* glyph); +static _Bool UhttpOnBody(struct Uhttp* uhttp, char* glyph); +static _Bool UhttpOnStopped(struct Uhttp* uhttp, char* glyph); + +static _Bool UhttpOnMethod(struct Uhttp* uhttp, char* glyph) { + switch (*glyph) { + case ' ': + if (!uhttp->public.method) return 0; + uhttp->parser.state = UhttpOnTarget; + *glyph = 0; + return 1; + default: + if (!isgraph(*glyph)) return 0; + if (!uhttp->public.method) uhttp->public.method = glyph; + return 1; + } +} + +static _Bool UhttpOnTarget(struct Uhttp* uhttp, char* glyph) { + switch (*glyph) { + case ' ': + if (!uhttp->public.target) return 0; + uhttp->parser.state = UhttpOnVersion; + *glyph = 0; + return 1; + default: + if (!isgraph(*glyph)) return 0; + if (!uhttp->public.target) uhttp->public.target = glyph; + return 1; + } +} + +static _Bool UhttpOnVersion(struct Uhttp* uhttp, char* glyph) { + switch (*glyph) { + case '\r': + if (uhttp->parser.maybe_eol) return 0; + uhttp->parser.maybe_eol = 1; + return 1; + case '\n': + if (!uhttp->parser.maybe_eol) return 0; + uhttp->parser.state = UhttpOnFieldName; + uhttp->parser.maybe_eol = 0; + return 1; + default: + if (uhttp->parser.maybe_eol) return 0; + if (!isprint(*glyph)) return 0; + return 1; + } +} + +static _Bool UhttpOnFieldName(struct Uhttp* uhttp, char* glyph) { + switch (*glyph) { + case '\r': + if (uhttp->parser.maybe_eol) return 0; + uhttp->parser.maybe_eol = 1; + return 1; + case '\n': + if (!uhttp->parser.maybe_eol) return 0; + uhttp->parser.state = + uhttp->public.body_size ? UhttpOnBody : UhttpOnStopped; + return 1; + case ' ': + return 0; + case ':': + if (uhttp->parser.maybe_eol) return 0; + if (!uhttp->parser.field_name) return 0; + uhttp->parser.state = UhttpOnFieldValue; + uhttp->parser.field_value = NULL; + *glyph = 0; + return 1; + default: + if (uhttp->parser.maybe_eol) return 0; + if (!isgraph(*glyph)) return 0; + if (!uhttp->parser.field_name) uhttp->parser.field_name = glyph; + return 1; + } +} + +static _Bool UhttpOnFieldValue(struct Uhttp* uhttp, char* glyph) { + switch (*glyph) { + case '\r': + if (uhttp->parser.maybe_eol) return 0; + uhttp->parser.maybe_ows = glyph; + uhttp->parser.maybe_eol = 1; + return 1; + case '\n': + if (!uhttp->parser.maybe_eol) return 0; + if (!uhttp->parser.field_value) return 0; + *uhttp->parser.maybe_ows = 0; + if (!uhttp->public.body_size && + StrEq(uhttp->parser.field_name, "Content-Length")) + uhttp->public.body_size = (size_t)atoi(uhttp->parser.field_value); + uhttp->parser.state = UhttpOnFieldName; + uhttp->parser.field_name = NULL; + uhttp->parser.maybe_eol = 0; + return 1; + case '\t': + case ' ': + if (uhttp->parser.maybe_eol) return 0; + if (!uhttp->parser.field_value) return 1; + if (!uhttp->parser.maybe_ows) uhttp->parser.maybe_ows = glyph; + return 1; + default: + if (uhttp->parser.maybe_eol) return 0; + if (!isgraph(*glyph)) return 0; + if (!uhttp->parser.field_value) uhttp->parser.field_value = glyph; + uhttp->parser.maybe_ows = NULL; + return 1; + } +} + +static _Bool UhttpOnBody(struct Uhttp* uhttp, char* glyph) { + if (!uhttp->public.body) uhttp->public.body = glyph; + ssize_t body_size = glyph - uhttp->public.body + 1; + if ((size_t)body_size == uhttp->public.body_size) + uhttp->parser.state = UhttpOnStopped; + return 1; +} + +static _Bool UhttpOnStopped(struct Uhttp* uhttp, char* glyph) { + (void)uhttp; + (void)glyph; + return 0; +} + +static void UhttpRelocateBuffer(struct Uhttp* uhttp, char* data) { + if (uhttp->public.method) + uhttp->public.method = data + (uhttp->public.method - uhttp->buffer.data); + if (uhttp->public.target) + uhttp->public.target = data + (uhttp->public.target - uhttp->buffer.data); + if (uhttp->public.body) + uhttp->public.body = data + (uhttp->public.body - uhttp->buffer.data); + if (uhttp->parser.field_name) { + uhttp->parser.field_name = + data + (uhttp->parser.field_name - uhttp->buffer.data); + } + if (uhttp->parser.field_value) { + uhttp->parser.field_value = + data + (uhttp->parser.field_value - uhttp->buffer.data); + } + if (uhttp->parser.maybe_ows) { + uhttp->parser.maybe_ows = + data + (uhttp->parser.maybe_ows - uhttp->buffer.data); + } + uhttp->buffer.data = data; +} + +struct Uhttp* UhttpCreate() { + struct Uhttp* result = calloc(1, sizeof(struct Uhttp)); + UhttpReset(result); + return result; +} + +void UhttpDestroy(struct Uhttp* uhttp) { + free(uhttp->buffer.data); + free(uhttp); +} + +void UhttpReset(struct Uhttp* uhttp) { + const struct Uhttp reset = {.buffer.data = uhttp->buffer.data, + .buffer.alloc = uhttp->buffer.alloc, + .parser.state = UhttpOnMethod}; + *uhttp = reset; +} + +void* UhttpAllocate(struct Uhttp* uhttp, size_t size) { + size_t alloc = uhttp->buffer.size + size; + if (alloc > uhttp->buffer.alloc) { + char* data = realloc(uhttp->buffer.data, alloc); + if (!data) return NULL; + if (data != uhttp->buffer.data) UhttpRelocateBuffer(uhttp, data); + uhttp->buffer.alloc = alloc; + } + return uhttp->buffer.data + uhttp->buffer.size; +} + +enum UhttpResult UhttpConsume(struct Uhttp* uhttp, size_t size) { + if (uhttp->buffer.size + size > uhttp->buffer.alloc) + return kUhttpResultTerminate; + size_t end = uhttp->buffer.size + size; + for (; uhttp->buffer.size < end; uhttp->buffer.size++) { + if (!uhttp->parser.state(uhttp, &uhttp->buffer.data[uhttp->buffer.size])) { + uhttp->parser.state = UhttpOnStopped; + return kUhttpResultFailure; + } + if (uhttp->parser.state == UhttpOnStopped) { + return kUhttpResultFinished; + } + } + return kUhttpResultWantMore; +} + +const char* UhttpGetMethod(const struct Uhttp* uhttp) { + return uhttp->public.method; +} + +const char* UhttpGetTarget(const struct Uhttp* uhttp) { + return uhttp->public.target; +} + +const char* UhttpGetBody(const struct Uhttp* uhttp) { + return uhttp->public.body; +} + +size_t UhttpGetBodySize(const struct Uhttp* uhttp) { + return uhttp->public.body_size; +} @@ -0,0 +1,50 @@ +/* + * Copyright (C) 2021 Mikhail Burakov. This file is part of MQhTTp. + * + * MQhTTp is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * MQhTTp is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with MQhTTp. If not, see <https://www.gnu.org/licenses/>. + */ + +#ifndef MQHTTP_UHTTP_H_ +#define MQHTTP_UHTTP_H_ + +#include <stddef.h> + +#ifdef __cplusplus +extern "C" { +#endif // __cplusplus + +enum UhttpResult { + kUhttpResultTerminate, + kUhttpResultFailure, + kUhttpResultWantMore, + kUhttpResultFinished +}; + +struct Uhttp* UhttpCreate(void); +void UhttpDestroy(struct Uhttp* uhttp); + +void UhttpReset(struct Uhttp* uhttp); +void* UhttpAllocate(struct Uhttp* uhttp, size_t size); +enum UhttpResult UhttpConsume(struct Uhttp* uhttp, size_t size); + +const char* UhttpGetMethod(const struct Uhttp* uhttp); +const char* UhttpGetTarget(const struct Uhttp* uhttp); +const char* UhttpGetBody(const struct Uhttp* uhttp); +size_t UhttpGetBodySize(const struct Uhttp* uhttp); + +#ifdef __cplusplus +} // extern "C" +#endif // __cplusplus + +#endif // MQHTTP_UHTTP_H_ |