webcit/tcp_sockets.c

   1 /*
   2  * tcp_sockets.c
   3  *
   4  * TCP socket module for WebCit
   5  *
   6  * version 1.3
   7  *
   8  */
   9
  10 #include <stdlib.h>
  11 #include <unistd.h>
  12 #include <stdio.h>
  13 #include <signal.h>
  14 #include <sys/types.h>
  15 #include <sys/socket.h>
  16 #include <netinet/in.h>
  17 #include <netdb.h>
  18 #include <string.h>
  19 #include <stdarg.h>
  20 #include "webcit.h"
  21
  22 char server_is_local = 0;
  23
  24 #ifndef INADDR_NONE
  25 #define INADDR_NONE 0xffffffff
  26 #endif
  27
  28 extern int errno;
  29
  30 int serv_sock;
  31
  32 #ifndef DONT_PROTO_HTONS
  33 u_short htons();
  34 #endif
  35 u_long inet_addr();
  36
  37
  38 void timeout() {
  39         printf("\rConnection timed out.\n");
  40         exit(3);
  41         }
  42
  43 int connectsock(host,service,protocol)
  44 char *host;
  45 char *service;
  46 char *protocol; {
  47         struct hostent *phe;
  48         struct servent *pse;
  49         struct protoent *ppe;
  50         struct sockaddr_in sin;
  51         int s,type;
  52
  53         bzero((char *)&sin,sizeof(sin));
  54         sin.sin_family = AF_INET;
  55
  56         pse=getservbyname(service,protocol);
  57         if (pse) {
  58                 sin.sin_port = pse->s_port;
  59                 }
  60         else if ((sin.sin_port = htons((u_short)atoi(service))) == 0) {
  61                 fprintf(stderr,"can't get %s service entry: %s\n",
  62                         service,strerror(errno));
  63                 return(-1);
  64                 }
  65
  66         phe=gethostbyname(host);
  67         if (phe) {
  68                 bcopy(phe->h_addr,(char *)&sin.sin_addr,phe->h_length);
  69                 }
  70         else if ((sin.sin_addr.s_addr = inet_addr(host))==INADDR_NONE) {
  71                 fprintf(stderr,"can't get %s host entry: %s\n",
  72                         host,strerror(errno));
  73                 return(-1);
  74                 }
  75
  76         if ((ppe=getprotobyname(protocol))==0) {
  77                 fprintf(stderr,"can't get %s protocol entry: %s\n",
  78                         protocol,strerror(errno));
  79                 return(-1);
  80                 }
  81
  82         if (!strcmp(protocol,"udp"))
  83                 type = SOCK_DGRAM;
  84         else
  85                 type = SOCK_STREAM;
  86
  87         s = socket(PF_INET,type,ppe->p_proto);
  88         if (s<0) {
  89                 fprintf(stderr,"can't create socket: %s\n",strerror(errno));
  90                 return(-1);
  91                 }
  92
  93
  94         signal(SIGALRM,timeout);
  95         alarm(30);
  96
  97         if (connect(s,(struct sockaddr *)&sin,sizeof(sin))<0) {
  98                 fprintf(stderr,"can't connect to %s.%s: %s\n",
  99                         host,service,strerror(errno));
 100                 return(-1);
 101                 }
 102
 103         alarm(0);
 104         signal(SIGALRM,SIG_IGN);
 105
 106         return(s);
 107         }
 108
 109
 110
 111
 112 /*
 113  * Input binary data from socket
 114  */
 115 void serv_read(buf,bytes)
 116 char buf[];
 117 int bytes; {
 118         int len,rlen;
 119
 120         len = 0;
 121         while(len<bytes) {
 122                 rlen = read(serv_sock,&buf[len],bytes-len);
 123                 if (rlen<1) {
 124                         printf("Network error - connection terminated.\n");
 125                         printf("%s\n", strerror(errno));
 126                         exit(3);
 127                         }
 128                 len = len + rlen;
 129                 }
 130         }
 131
 132
 133 /*
 134  * input string from pipe
 135  */
 136 void serv_gets(strbuf)
 137 char strbuf[]; {
 138         int ch,len,rlen;
 139         char buf[2];
 140
 141         len = 0;
 142         strcpy(strbuf,"");
 143         do {
 144                 serv_read(&buf[0], 1);
 145                 ch = buf[0];
 146                 strbuf[len++] = ch;
 147                 } while((ch!=10)&&(ch!=13)&&(ch!=0)&&(len<255));
 148         strbuf[len-1] = 0;
 149         }
 150
 151
 152
 153 /*
 154  * Attach to a Citadel server
 155  */
 156 void attach_to_server(argc,argv)
 157 int argc;
 158 char *argv[]; {
 159         if (argc==1) {
 160                 server_is_local = 1;
 161                 serv_sock = connectsock("localhost","citadel","tcp");
 162                 }
 163         if (argc==2) {
 164                 serv_sock = connectsock(argv[1],"citadel","tcp");
 165                 if ( (!strcmp(argv[1],"localhost"))
 166                 || (!strcmp(argv[1],"127.0.0.1")) ) server_is_local = 1;
 167                 }
 168         if (argc>=3) serv_sock = connectsock(argv[1],argv[2],"tcp");
 169
 170         if (serv_sock < 0) exit(errno);
 171         }
 172
 173
 174 /*
 175  * send binary to server
 176  */
 177 void serv_write(buf, nbytes)
 178 char buf[];
 179 int nbytes; {
 180         int bytes_written = 0;
 181         int retval;
 182         while (bytes_written < nbytes) {
 183                 retval = write(serv_sock, &buf[bytes_written],
 184                         nbytes - bytes_written);
 185                 if (retval < 1) {
 186                         printf("Network error - connection terminated.\n");
 187                         printf("%s\n", strerror(errno));
 188                         exit(3);
 189                         }
 190                 bytes_written = bytes_written + retval;
 191                 }
 192         }
 193
 194
 195 /*
 196  * send line to server
 197  */
 198 void serv_puts(string)
 199 char *string; {
 200         char buf[256];
 201
 202         sprintf(buf,"%s\n",string);
 203         serv_write(buf, strlen(buf));
 204         }
 205
 206
 207 /*
 208  * convenience function to send stuff to the server
 209  */
 210 void serv_printf(const char *format, ...) {
 211         va_list arg_ptr;
 212         char buf[256];
 213
 214         va_start(arg_ptr, format);
 215         vsprintf(buf, format, arg_ptr);
 216         va_end(arg_ptr);
 217
 218         strcat(buf, "\n");
 219         serv_write(buf, strlen(buf));
 220         }
 221
 222