src/socket.c

   1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*- */
   2
   3 /*  Monkey HTTP Daemon
   4  *  ------------------
   5  *  Copyright (C) 2008-2009 Eduardo Silva P.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU Library General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20  */
  21
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <errno.h>
  25 #include <time.h>
  26 #include <arpa/inet.h>
  27 #include <netinet/tcp.h>
  28 #include <sys/socket.h>
  29 #include <unistd.h>
  30 #include <fcntl.h>
  31 #include <string.h>
  32
  33 #include "socket.h"
  34 #include "memory.h"
  35
  36 /*
  37  * Example from:
  38  * http://www.baus.net/on-tcp_cork
  39  */
  40 int mk_socket_set_cork_flag(int fd, int state)
  41 {
  42         return setsockopt(fd, SOL_TCP, TCP_CORK, &state, sizeof(state));
  43 }
  44
  45 int mk_socket_set_nonblocking(int sockfd)
  46 {
  47         if (fcntl(sockfd, F_SETFL, fcntl(sockfd, F_GETFD, 0)|O_NONBLOCK) == -1) {
  48                 perror("fcntl");
  49                 return -1;
  50         }
  51         return 0;
  52 }
  53
  54 int mk_socket_set_tcp_nodelay(int sockfd)
  55 {
  56         int on=1;
  57         return setsockopt(sockfd, SOL_TCP, TCP_NODELAY, &on, sizeof(on));
  58 }
  59
  60 char *mk_socket_get_ip(int socket)
  61 {
  62         int ipv4_len = 16;
  63         socklen_t len;
  64         char *ipv4;
  65         struct sockaddr_in m_addr;
  66
  67         ipv4 = mk_mem_malloc(ipv4_len);
  68         if(!ipv4)
  69         {
  70                 return NULL;
  71         }
  72
  73         len = sizeof(m_addr);
  74         getpeername(socket, (struct sockaddr*)&m_addr,  &len);
  75         return (char *) inet_ntop(PF_INET, &m_addr.sin_addr, ipv4, ipv4_len);
  76 }
  77
  78 int mk_socket_close(int socket)
  79 {
  80         return close(socket);
  81 }
  82
  83 int mk_socket_timeout(int s, char *buf, int len,
  84                 int timeout, int recv_send)
  85 {
  86         fd_set fds;
  87         time_t init_time, max_time;
  88         int n=0, status;
  89         struct timeval tv;
  90
  91         init_time=time(NULL);
  92         max_time = init_time + timeout;
  93
  94         FD_ZERO(&fds);
  95         FD_SET(s,&fds);
  96
  97         tv.tv_sec=timeout;
  98         tv.tv_usec=0;
  99
 100         if(recv_send==ST_RECV)
 101                 n=select(s+1,&fds,NULL,NULL,&tv);  // recv
 102         else{
 103                 n=select(s+1,NULL,&fds,NULL,&tv);  // send
 104         }
 105
 106         switch(n){
 107                 case 0:
 108                                 return -2;
 109                                 break;
 110                 case -1:
 111                                 //pthread_kill(pthread_self(), SIGPIPE);
 112                                 return -1;
 113         }
 114
 115         if(recv_send==ST_RECV){
 116                 status=recv(s,buf,len, 0);
 117         }
 118         else{
 119                 status=send(s,buf,len, 0);
 120         }
 121
 122         if( status < 0 ){
 123                 if(time(NULL) >= max_time){
 124                         //pthread_kill(pthread_self(), SIGPIPE);
 125                 }
 126         }
 127
 128         return status;
 129 }
 130
 131 int mk_socket_create()
 132 {
 133         int sockfd;
 134
 135         if ((sockfd = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
 136                 perror("client: socket");
 137                 return -1;
 138         }
 139
 140         return sockfd;
 141 }
 142
 143 int mk_socket_connect(int sockfd, char *server, int port)
 144 {
 145         int res;
 146         struct sockaddr_in *remote;
 147
 148         remote = (struct sockaddr_in *)
 149                 mk_mem_malloc_z(sizeof(struct sockaddr_in));
 150         remote->sin_family = AF_INET;
 151         res = inet_pton(AF_INET, server, (void *)(&(remote->sin_addr.s_addr)));
 152
 153         if(res < 0)
 154         {
 155                 perror("Can't set remote->sin_addr.s_addr");
 156                 mk_mem_free(remote);
 157                 return -1;
 158         }
 159         else if(res == 0){
 160                 perror("Invalid IP address\n");
 161                 mk_mem_free(remote);
 162                 return -1;
 163         }
 164
 165         remote->sin_port = htons(port);
 166         if (connect(sockfd,
 167                     (struct sockaddr *)remote,
 168                     sizeof(struct sockaddr)) == -1)
 169         {
 170                 close(sockfd);
 171                 perror("client: connect");
 172                 return -1;
 173         }
 174         mk_mem_free(remote);
 175         return 0;
 176 }
 177
 178 void mk_socket_reset(int socket)
 179 {
 180         int status=1;
 181
 182         if(setsockopt(socket,SOL_SOCKET,SO_REUSEADDR,&status,sizeof(int))==-1) {
 183                 perror("setsockopt");
 184                 exit(1);
 185         }
 186 }
 187
 188 /* Just IPv4 for now... */
 189 int mk_socket_server(int port)
 190 {
 191         int fd;
 192         struct sockaddr_in local_sockaddr_in;
 193
 194         /* Create server socket */
 195         fd=socket(PF_INET,SOCK_STREAM,0);
 196         mk_socket_set_tcp_nodelay(fd);
 197         //mk_socket_set_nonblocking(fd);
 198
 199         local_sockaddr_in.sin_family=AF_INET;
 200         local_sockaddr_in.sin_port=htons(port);
 201         local_sockaddr_in.sin_addr.s_addr=INADDR_ANY;
 202         memset(&(local_sockaddr_in.sin_zero),'\0',8);
 203
 204         /* Avoid bind issues, reset socket */
 205         mk_socket_reset(fd);
 206
 207         if(bind(fd,(struct sockaddr *)&local_sockaddr_in,
 208                 sizeof(struct sockaddr)) != 0)
 209         {
 210                 perror("bind");
 211                 printf("Error: Port %i cannot be used\n", port);
 212                 exit(1);
 213         }
 214
 215         /* Listen queue:
 216          * The queue limit is given by /proc/sys/net/core/somaxconn
 217          * we need to add a dynamic function to get that value on fly
 218          */
 219         if((listen(fd, 1024))!=0) {
 220                 perror("listen");
 221                 exit(1);
 222         }
 223
 224         return fd;
 225 }