/* dgramsrvr.c:
*
* Example datagram server:
*/
#include <ctype.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
/*
* This function reports the error and
* exits back to the shell:
*/
static void
bail(const char *on_what)
{
fputs(strerror(errno),stderr);
fputs(": ",stderr);
fputs(on_what,stderr);
fputc('
',stderr);
exit(1);
}
int main(int argc,char **argv)
{
int z;
char *srvr_addr = NULL;
struct sockaddr_in adr_inet;/* AF_INET */
struct sockaddr_in adr_clnt;/* AF_INET */
int len_inet;
/* length */
int s;
/* Socket */
char dgram[512];
/* Recv buffer */
char dtfmt[512];
/* Date/Time Result */
time_t td;
/* Current Time and Date */
struct tm tm;
/* Date time values */
/*
* Use a server address from the command
* line, if one has been provided.
* Otherwise, this program will default
* to using the arbitrary address
* 127.0.0.23:
*/
if ( argc >= 2 )
{
/* Addr on cmdline: */
srvr_addr = argv[1];
}
else
{
/* Use default address: */
srvr_addr = "127.0.0.23";
}
/*
* Create a UDP socket to use:
*/
s = socket(AF_INET,SOCK_DGRAM,0);
if ( s == -1 )
bail("socket()");
/*
* Create a socket address, for use
* with bind(2):
*/
memset(&adr_inet,0,sizeof adr_inet);
adr_inet.sin_family = AF_INET;
adr_inet.sin_port = htons(9090);
adr_inet.sin_addr.s_addr = inet_addr(srvr_addr);
if ( adr_inet.sin_addr.s_addr == INADDR_NONE )
bail("bad address.");
len_inet = sizeof adr_inet;
/*
* Bind a address to our socket, so that
* client programs can contact this
* server:
*/
z = bind(s,(struct sockaddr *)&adr_inet,len_inet);
if ( z == -1 )
bail("bind()");
/*
* Now wait for requests:
*/
for (;;)
{
/*
* Block until the program receives a
* datagram at our address and port:
*/
len_inet = sizeof adr_clnt;
z = recvfrom(s,
/* Socket */
dgram,
/* Receiving buffer */
sizeof dgram,
/* Max recv buf size */
0,
/* Flags: no options */
(struct sockaddr *)&adr_clnt,/* Addr */
&len_inet);
/* Addr len, in & out */
if ( z < 0 )
bail("recvfrom(2)");
/*
* Process the request:
*/
dgram[z] = 0;
/* null terminate */
if ( !strcasecmp(dgram,"QUIT") )
break;
/* Quit server */
/*
* Get the current date and time:
*/
//chuyen ky tu Thuong sang Hoa
/*
int i=0;
for(;i<z;i++)
{
char tam=dgram[i];
tam=toupper(tam);
dtfmt[i]=tam;
}
dtfmt[z]=0;
*/
//chuyen ky tu Hoa sang Thương
/*
int i=0;
for(;i<z;i++)
{
char tam=dgram[i];
tam=tolower(tam);
dtfmt[i]=tam;
}
dtfmt[z]=0;
*/
// viet Hoa ky tu dau tien: Nguyen Hoang Kiet
/*int i=0;char Tam[512];char tmp;
for(;i<z;i++)
{
tmp=dgram[i];
tmp=tolower(tmp);
Tam[i]=tmp;
}
Tam[z]=0;
i=0;
for(;i<z;i++)
{
if(i==0)
{
tmp=Tam[i];
tmp=toupper(tmp);
dtfmt[i]=tmp;
}
else
if(Tam[i-1]==' ')
{
tmp=Tam[i];
tmp=toupper(tmp);
dtfmt[i]=tmp;
}
else
{
tmp=Tam[i];
dtfmt[i]=tmp;
}
}
dtfmt[z]=0;
*/
// tra ve do dai cua chuoi
// time(&td);
/* Get current time & date */
// tm = *localtime(&td); /* Get components */
/*
* Format a new date and time string,
* based upon the input format string:
*/
// strftime(dtfmt,
/* Formatted result */
// sizeof dtfmt,
/* Max result size */
// dgram,
/* Input date/time format */
// &tm);
/* Input date/time values */
/*
* Send the formatted result back to the
* client program:
*/
z = sendto(s,
/* Socket to send result */
dtfmt, /* The datagram result to snd */
strlen(dtfmt), /* The datagram lngth */
0,
/* Flags: no options */
(struct sockaddr *)&adr_clnt,/* addr */
len_inet); /* Client address length */
if ( z < 0 )
bail("sendto(2)");
}
/*
* Close the socket and exit:
*/
close(s);
return 0;
}
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