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smtpserver.c
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smtpserver.c
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#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <arpa/inet.h>
int main()
{
char buf[100],domain[20],snd[25];
int k,i=0,j,m=0;
socklen_t len;
int sock_desc;
struct sockaddr_in client,server;
memset(&server,0,sizeof(server));
memset(&client,0,sizeof(client));
sock_desc = socket(AF_INET,SOCK_DGRAM,0);
if(sock_desc == -1)
{
printf("\nError in socket creation\n");
exit(1);
}
server.sin_family=AF_INET;
server.sin_addr.s_addr=INADDR_ANY;
server.sin_port=3500;
k=bind(sock_desc,(struct sockaddr*)&server,sizeof(server));
if(k==-1)
{
printf("Error in binding\n");
exit(1);
}
len=sizeof(server);
k=recvfrom(sock_desc,buf,sizeof(buf),0,(struct sockaddr*)&server,&len);
if(k==-1)
{
printf("Error in receiving\n");
exit(1);
}
strcpy(snd,buf);
while(i<(strlen(buf)))
{
if(buf[i]=='@')
{
for(j=i+1;j<strlen(buf);j++)
domain[m++]=buf[j];
break;
}
i++;
}
printf("Receiving mail.....\n");
printf("Domain verifed << %s >>\n",domain);
len=sizeof(server);
k=recvfrom(sock_desc,buf,sizeof(buf),0,(struct sockaddr*)&server,&len);
if(k==-1)
{
printf("\nError in receiving\n");
exit(1);
}
printf("From : %s\n",buf);
len=sizeof(server);
k=recvfrom(sock_desc,buf,sizeof(buf),0,(struct sockaddr*)&server,&len);
if(k==-1)
{
printf("\nError in receiving\n");
exit(1);
}
printf("Subject : %s\n",buf);
printf("Message : ");
len=sizeof(server);
k=recvfrom(sock_desc,buf,sizeof(buf),0,(struct sockaddr*)&server,&len);
if(k==-1)
{
printf("\nError in receiving\n");
exit(1);
}
while(strcmp(buf,".")!=0)
{
printf("%s\n\t",buf);
len=sizeof(server);
k=recvfrom(sock_desc,buf,sizeof(buf),0,(struct sockaddr*)&server,&len);
if(k==-1)
{
printf("\nError in receiving\n");
exit(1);
}
}
printf("Mail recieved sucessfully from %s\n",snd);
close(sock_desc);
return 0;
}