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/* __ _
* ____ / /_ ____ ___ __ ___________ _(_)
* / __ \/ __ \/ __ `__ \/ / / / ___/ __ `/ /
* / /_/ / / / / / / / / / /_/ / /__/ /_/ / /
* \____/_/ /_/_/ /_/ /_/\__, /\___/\__, /_/
* /____/ /____/
*
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2021, Max Christian Pohle <max@coderonline.de>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* {{{ DISCLAIMER
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
* }}}
*/
#include "main.h"
static int read_everything(FILE * f_r, FILE * output) {
const int read_buffer_length = READ_BUFFER_LENGTH;
char read_buffer[read_buffer_length];
for(size_t size = -2 ; ; size = fread(read_buffer, 1, read_buffer_length, f_r)) {
if(-2 == size || (-1 == size && EWOULDBLOCK == errno)) {
usleep(EWOULDBLOCK_DELAY); // try again a little later
continue;
}
fwrite(read_buffer, 1, size, output);
if (read_buffer_length > POST_DATA_MAX_LENGTH)
return EXIT_FAILURE;
if (size < read_buffer_length) { // I expect one nmemb of data
break;
}
}
fflush(output);
return EXIT_SUCCESS;
}
static void * answer_request(size_t new_socket) {
FILE * f_r = fdopen((size_t) new_socket, "r");
char * output_buffer = NULL;
size_t output_buffer_length = 0;
FILE * output = open_memstream(&output_buffer, &output_buffer_length);
read_everything(f_r, output); // TODO: catch return value and error handling
fflush(output);
// shutdown(new_socket, SHUT_RD); // shutdown the reading half of the connection
DEBUG("> Output buffer has a length of %ld bytes\n", output_buffer_length);
// TODO: make parsing function abstract (e.g. parse(...) function point with dlsym)
parse_http(new_socket, output_buffer, output_buffer_length);
fclose(f_r);
fclose(output);
free(output_buffer);
return NULL;
}
int become_daemon(const char * name) {
# ifndef DEBUG // debugging is simpler in foreground mode
if(fork()) {
exit(EXIT_SUCCESS);
} else {
setsid();
if(fork()) {
exit(EXIT_SUCCESS);
} else {
syslog(0, "daemon '%s' is running with pid %d", name, getpid());
}
}
# endif
return EXIT_SUCCESS;
}
static int serve(int server_fd)
{
struct sockaddr_in address;
socklen_t address_len = sizeof(address);
DEBUG("> Waiting for connections on server file descriptor %d\n", server_fd);
size_t new_socket = -1;
while(-1 != (new_socket = accept(server_fd, (struct sockaddr*) &address, &address_len)))
{
DEBUG("> Client %ld is connected via port %d\n", new_socket, address.sin_port);
// set non blocking mode...
fcntl(new_socket, F_SETFL,
fcntl(new_socket, F_GETFL) | O_NONBLOCK
);
answer_request(new_socket);
#ifdef VALGRIND
break; // only run once, so that valgrind can test allocations&frees
#endif
}
err(errno, "error serving");
close(server_fd);
}
int main(const int argc, char const * argv[]) {
int server_fd = -1;
int port = atoi(argc > 1 ? argv[1] : "8080");
0 == port ? port = 8080 : port;
// char * pidfile = NULL;
// char ** next_param = NULL;
// for(int i=1; i<argc; i++) {
// switch(strspn(argv[i], "-")) {
// case 1: // one minus (short param)
// if(argv[i][2] != '\0') // one minus, one param and a null char
// break;
// if(next_param)
// err(EXIT_FAILURE, "wrong parameter: %s\n", argv[i]);
// switch(argv[i][1]) {
// case 't': puts("t was chosen"); break;
// case 'e': puts("e was chosen"); break;
// case 's': puts("s was chosen"); break;
// }
// break;
// case 2: // two minus (long param)
// if(next_param)
// err(EXIT_FAILURE, "wrong parameter: %s\n", argv[i]);
// if(0 == strcmp("pidfile", &argv[i][2])) {
// next_param = &pidfile;
// }
// break;
// default:
// // pidfile = (char*) argv[i];
// *next_param = (char*) argv[i];
// }
// }
// printf("pidfile is '%s'\n", pidfile);
// return EXIT_SUCCESS;
struct sockaddr_in address = {
.sin_family = AF_INET,
.sin_addr.s_addr = INADDR_ANY,
.sin_port = htons(port)
};
// I <3 C
0 == (server_fd = socket(AF_INET, SOCK_STREAM, 0))
? err(errno, NULL)
: bind(server_fd, (struct sockaddr*) &address, sizeof(address))
? err(errno, NULL)
: listen(server_fd, SOMAXCONN)
? err(errno, NULL)
: become_daemon(argv[0])
? err(errno, NULL)
: serve(server_fd)
? err(errno, NULL)
: exit(EXIT_SUCCESS)
; return EXIT_FAILURE;
}
// modeline for vim: shiftwidth=2 tabstop=2 number foldmethod=marker
|
