Client Source Code

00001 /* tcpcli.c */
00002 /* linked with wrapsock */
00003 /* Server module */
00004 /* Author: Michèle Garoche */
00005 /* Date: February 26th 2003
00006 /* Feel free to do what you want with it */
00007 
00029 /* Includes */
00030 #include "wrapsock.h"
00031 
00038 int main(int argc, char *argv[])
00039 {
00040         /* Variables */
00044         int sockfd;                                             /* socket's file descriptors */
00048         int chopt;                                              /* dummy variable for options test */
00052         int port_served = 0;                    /* port to connect */
00056         int bflag = 0;                                  /* dummy variable for number of addresses supplied */
00060         char progname[MAXLINE];                 /* program's name */
00064         char addropt[MAXLINE];                  /* bound address */
00068         struct sockaddr_in servaddr;    /* structure of socket address */
00069 
00070         /* Retrieve the program's name */
00072         strcpy(progname, argv[0]);
00073 
00074         /* The user should supplied an option for port and an address.
00075         As the first argument is the program name, we should have
00076         3 arguments */
00078		   if (argc != 3)
00079         {
00080                 /* Display the help and quit */
00081                 cliusage(progname);
00082         }
00083 
00084         /* Check for a valid option */
00085         while ((chopt = getopt(argc, argv, "abch")) != -1)
00087         {
00088                 switch (chopt)
00089                 {
00090                         case 'a':
00091                         {
00092                                 port_served = 1;
00093                                 break;
00094                         }
00095                         case 'b':
00096                         {
00097                                 port_served = 2;
00098                                 break;
00099                         }
00100                         case 'c':
00101                         {
00102                                 port_served = 3;
00103                                 break;
00104                         }
00105                         case 'h':
00106                         default:
00107                         {
00108                                 /* Display help and quit */
00109                                 cliusage(progname);
00110                         }
00111                 }
00112         }
00113 
00114         /* Check the existence of the address
00115         optind is incremented each time an option is checked,
00116         hence if optind is equal to argc at the end of the
00117         previous function, it means the user has either not supplied an address
00118         or not supplied a port as a valid option */
00120         if (optind == argc)
00121         {
00122                 /* Display help and quit */
00123                 cliusage(progname);
00124         }
00125         else
00126         {
00127                 /* Loop through the not already traversed arguments */
00128                 for (; optind < argc; optind ++)
00129                 {
00130                         /* Increments the dummy flag and store the address */
00131                         bflag++;
00132                         strcpy(addropt, argv[optind]);
00133                 }
00134                 /* If there are more than one address, display help and quit */
00135                 if (bflag > 1)
00136                 {
00137                         cliusage(progname);
00138                 }
00139         }
00140 
00141         /* Compute the real port number */
00142         port_served = port_served +  SERV_PORT1 - 1;
00143 
00144         /* Display help and quit if the argument for port is supplied without a dash before it */
00146         if (port_served < SERV_PORT1 || port_served > SERV_PORT3)
00147         {
00148                 cliusage(progname);
00149         }
00150 
00151         /* Help message for the user */
00153         fprintf(stdout, "\nThe client %s will be connected on address %s "
00154                  "to port %d.\nIts pid is %d.\n\nDepending of the port you chose"
00155                  ", you will be able to send requests\nfor computing numbers "
00156                  "(b), converting words to lowercase (c), or both types\nof "
00157                  "requests (a).\n\nTo Terminate the client, use ctrl-D.\n\nTo "
00158                  "erase an entry before sending it, use ctrl-U\n(useful if the "
00159                  "buffer is full).\n\nYou can connect as many clients as your "
00160                  "system supports to the server.\n\nYou can also connect from "
00161                  "a remote host (via ssh for example)."
00162                  "\n\n", progname, addropt, port_served, (int)getpid());
00163 
00164         /* Create the socket */
00166         sockfd = Socket(AF_INET, SOCK_STREAM, 0);
00167 
00168         /* Fill in the address structure */
00170         bzero(&servaddr, sizeof(servaddr));
00171         servaddr.sin_family = AF_INET;
00172         servaddr.sin_port = htons(port_served);
00173         /* Converts the address supplied by the user into network byte order address
00174                 if the address is incorrect, quit */
00176         Inet_pton(AF_INET, addropt, &servaddr.sin_addr);
00177 
00178         /* Connect the socket to address and port supplied */
00180         Connect(sockfd, (SA *) &servaddr, sizeof(servaddr));
00181 
00182         /* Send the request to the socket */
00184         str_cli(stdin, sockfd);
00185                         
00187         exit(EXIT_SUCCESS);
00188 }