/* This software is part of libcsdr, a set of simple DSP routines for Software Defined Radio. Copyright (c) 2014, Andras Retzler All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * 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. * Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. 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 ANDRAS RETZLER 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 "tsmpool.h" int host_port = 0; char host_address[100] = "127.0.0.1"; int thread_cntr = 0; //CLI parameters int bufsize = 1024; //! currently unused int bufcnt = 1024; char* global_argv; int global_argc; tsmpool* pool; void sig_handler(int signo) { fprintf(stderr, MSG_START "signal %d caught, exiting...\n", signo); fflush(stderr); exit(0); } int main(int argc, char* argv[]) { global_argv = argv; global_argc = argc; int c; for(;;) { int option_index = 0; static struct option long_options[] = { {"port", required_argument, 0, 'p' }, {"address", required_argument, 0, 'a' }, {"bufsize", required_argument, 0, 'b' }, {"bufcnt", required_argument, 0, 'n' } }; c = getopt_long(argc, argv, "p:a:b:n:", long_options, &option_index); if(c==-1) break; switch (c) { case 'a': host_address[100-1]=0; strncpy(host_address,optarg,100-1); break; case 'p': host_port=atoi(optarg); break; case 'b': bufsize=atoi(optarg); break; case 'n': bufcnt=atoi(optarg); break; case 0: case '?': case ':': default:; print_exit(MSG_START "error in getopt_long()\n"); } } if(!host_port) print_exit(MSG_START "missing required command line argument, --port.\n"); if(bufsize<0) print_exit(MSG_START "invalid value for --bufsize (should be >0)\n"); if(bufcnt<0) print_exit(MSG_START "invalid value for --bufcnt (should be >0)\n"); //set signals struct sigaction sa; memset(&sa, 0, sizeof(sa)); sa.sa_handler = sig_handler; sigaction(SIGTERM, &sa, NULL); sigaction(SIGKILL, &sa, NULL); sigaction(SIGQUIT, &sa, NULL); sigaction(SIGINT, &sa, NULL); sigaction(SIGHUP, &sa, NULL); struct sockaddr_in addr_host; int listen_socket; std::vector clients; clients.reserve(100); listen_socket=socket(AF_INET,SOCK_STREAM,0); int sockopt = 1; if( setsockopt(listen_socket, SOL_SOCKET, SO_REUSEADDR, (char *)&sockopt, sizeof(sockopt)) == -1 ) error_exit(MSG_START "cannot set SO_REUSEADDR"); //the best description on SO_REUSEADDR ever: http://stackoverflow.com/a/14388707/3182453 memset(&addr_host,'0',sizeof(addr_host)); addr_host.sin_family = AF_INET; addr_host.sin_port = htons(host_port); addr_host.sin_addr.s_addr = INADDR_ANY; if( (addr_host.sin_addr.s_addr=inet_addr(host_address)) == INADDR_NONE ) error_exit(MSG_START "invalid host address"); if( bind(listen_socket, (struct sockaddr*) &addr_host, sizeof(addr_host)) < 0 ) error_exit(MSG_START "cannot bind() address to the socket"); if( listen(listen_socket, 10) == -1 ) error_exit(MSG_START "cannot listen() on socket"); fprintf(stderr,MSG_START "listening on %s:%d\n", inet_ntoa(addr_host.sin_addr), host_port); struct sockaddr_in addr_cli; socklen_t addr_cli_len = sizeof(addr_cli); int new_socket; int highfd = 0; FD_ZERO(&select_fds); FD_SET(listen_socket, &select_fds); maxfd(&highfd, listen_socket); FD_SET(input_fd, &select_fds); maxfd(&highfd, input_fd); //Set stdin and listen_socket to non-blocking if(set_nonblocking(input_fd) || set_nonblocking(listen_socket)) error_exit(MSG_START "cannot set_nonblocking()"); //Create tsmpool pool = new tsmpool(bufsize, bufcnt); if(!pool->ok) print_exit(MSG_START "tsmpool failed to initialize\n"); unsigned char* current_write_buffer = pool->get_write_buffer(); int index_in_current_write_buffer = 0; pthread_cond_t* wait_condition = new wait_condition; pthread_cond_init(wait_condition, NULL); for(;;) { //Let's wait until there is any new data to read, or any new connection! select(highfd, &select_fds, NULL, NULL, NULL); //Is there a new client connection? if( (new_socket = accept(listen_socket, (struct sockaddr*)&addr_cli, &addr_cli_len)) != -1) { clients_close_all_finished(); //We're the parent, let's create a new client and initialize it client_t* new_client = new client_t; new_client->error = 0; memcpy(&new_client->addr, &addr_cli, sizeof(new_client->addr)); new_client->socket = new_socket; new_client->status = CS_CREATED; new_client->tsmthread = pool->register_thread(); new_client->lpool = pool; pthread_mutex_init(&new_client->wait_mutex, NULL); new_client->wait_condition = wait_condition; new_client->sleeping = 0; if(pthread_create(&new_client->thread, NULL, client_thread , (void*)&new_client)<0) { clients.push_back(new_client); fprintf(stderr, MSG_START "pthread_create() done, clients now: %d\n", clients.size()); } else { fprintf(stderr, MSG_START "pthread_create() failed.\n"); } } if(index_in_current_write_buffer >= bufsize) { current_write_buffer = pool->get_write_buffer(); pthread_cond_broadcast(wait_condition); index_in_current_write_buffer = 0; } int retval = read(input_fd, current_write_buffer + index_in_current_write_buffer, bufsize - index_in_current_write_buffer); if(retval>0) { index_in_current_write_buffer += retval; } else if(retval==0) { //!end of input stream, close clients and exit print_exit(MSG_START "end of input, exiting.\n") } } } #if 0 for (int i=0; ipipefd[1], buf, retval)==-1) { if(!clients[i]->error) { print_client(clients[i], "lost buffer, failed to write pipe."); clients[i]->error=1; } //fprintf(stderr, MSG_START "errno is %d\n", errno); //usually 11 //int wpstatus; //int wpresult = waitpid(clients[i]->pid, &wpstatus, WNOHANG); //fprintf(stderr, MSG_START "pid is %d\n",clients[i]->pid); //perror("somethings wrong"); //if(wpresult == -1) print_client(clients[i], "error while waitpid()!"); //else if(wpresult == 0) waitpid(clients[i]->pid, NULL, WNOHANG); if(!proc_exists(clients[i]->pid)) { //Client exited! print_client(clients[i], "closing client from main process."); close(clients[i]->pipefd[1]); close(clients[i]->socket); delete clients[i]; clients.erase(clients.begin()+i); fprintf(stderr, MSG_START "done closing client from main process.\n"); } } else { if(clients[i]->error) print_client(clients[i], "pipe okay again."); clients[i]->error=0; } } } //TODO: at the end, server closes pipefd[1] for client #endif void client_erase(client_t* client) { pthread_mutex_destroy(client->wait_mutex); pthread_cond_destroy(client->wait_condition); pool-> } void clients_close_all_finished() { for(int i=0;istatus == CS_THREAD_FINISHED) { client_erase(clients[i]); clients.erase(i); } } } void* client_thread (void* param) { client_t* this_client = (client_t*)param; this_client->status = CS_THREAD_RUNNING; int retval; tsmpool* lpool = this_client->lpool; for(;;) { //wait until there is any data in the tsmpool for me (wait for the server process to wake me up) for(;;) { char* pool_read_buffer = (char*)lpool->get_read_buffer(); if(pool_read_buffer) break; pthread_mutex_lock(&this_client->wait_mutex); this_client->sleeping = 1; pthread_cond_wait(this_client->wait_condition, &this_client->wait_mutex); } //wait for the socket to be available for write //read data from server global tsmpool //write data to client socket //have an exit condition } this_client->status = CS_THREAD_FINISHED; pthread_exit(NULL); return NULL; } void error_exit(const char* why) { perror(why); //do we need a \n at the end of (why)? exit(1); } void print_exit(const char* why) { fprintf(stderr, "%s", why); exit(1); } void maxfd(int* maxfd, int fd) { if(fd>=*maxfd) *maxfd=fd+1; }