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https://github.com/eddyem/eddys_snippets.git
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121 lines
3.4 KiB
C
121 lines
3.4 KiB
C
/*
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* This file is part of the socksnippet project.
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* Copyright 2022 Edward V. Emelianov <edward.emelianoff@gmail.com>.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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// client-side functions
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#include <stdio.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <usefull_macros.h>
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#include "client.h"
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#include "socket.h"
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/**
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* @brief processData - process here some actions and make messages for server
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* @param buf (o) - buffer for answer
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* @param l - max length of buf
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* @return amount of answer bytes
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*/
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static int process_data(char *buf, int l){
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if(!buf || !l) return 0;
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/* USERCODE: get here some data to send */
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static double t0 = 0.;
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if(dtime() - t0 > 1.){
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t0 = dtime();
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// send random commands each 1 second
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int x = rand() % 600;
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const char *cmd = NULL;
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if(x < 100) cmd = "time";
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else if(x < 200) cmd = "getval1";
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else if(x < 300) cmd = "getval2";
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else if(x < 400) cmd = "ping";
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if(cmd) snprintf(buf, l, "%s", cmd);
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else{
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if(x < 500) snprintf(buf, l, "setval1=%d", rand() & 0xff);
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else snprintf(buf, l, "setval2=%d", rand() & 0xff);
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}
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return strlen(buf);
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}
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return 0;
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}
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/**
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* @brief process_server_message - parse messages from server and make an answer
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* @param buf (io) - incoming message (the answer will be in this buffer)
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* @param l - buff max length
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* @return amount of answer bytes
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*/
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static int process_server_message(char *buf, int l){
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/* USERCODE inside this funtion */
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if(!buf || !l) return 0;
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// just show on screen
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green("SERVER send: %s\n", buf);
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return 0;
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}
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/**
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* check data from fd (polling function for client)
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* @param fd - file descriptor
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* @return 0 in case of timeout, 1 in case of fd have data, -1 if error
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*/
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static int canberead(int fd){
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fd_set fds;
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struct timeval timeout;
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timeout.tv_sec = 0;
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timeout.tv_usec = 100;
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FD_ZERO(&fds);
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FD_SET(fd, &fds);
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do{
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int rc = select(fd+1, &fds, NULL, NULL, &timeout);
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if(rc < 0){
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if(errno != EINTR){
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LOGWARN("select()");
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WARN("select()");
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return -1;
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}
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continue;
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}
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break;
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}while(1);
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if(FD_ISSET(fd, &fds)){
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//DBG("FD_ISSET");
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return 1;
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}
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return 0;
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}
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void client(int sock){
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char buf[BUFLEN];
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while(1){
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int l = process_data(buf, BUFLEN-1);
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if(l) sendmessage(sock, buf, l);
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if(1 != canberead(sock)) continue;
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int n = read(sock, buf, BUFLEN-1);
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if(n == 0){
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WARNX("Server disconnected");
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signals(0);
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}
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buf[n] = 0;
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DBG("Got from server: %s", buf);
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LOGMSG("Got from server: %s", buf);
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l = process_server_message(buf, n);
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if(l) sendmessage(sock, buf, l);
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}
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}
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