Write the appropriate netcat command to interface with the server (udpserv01.c).

Question

Write the appropriate netcat command to interface with the server (udpserv01.c). You will possibly need to try it out.

udpserv01.c

int main (int argc, char **argv) {

int sockfd;

struct sockaddr_in servaddr, cliaddr;

sockfd = Socket(AF_INET, SOCK_DGRAM, 0);

bzero(&servaddr, sizeof(servaddr));

servaddr.sin_family = AF_INET;

servaddr.sin_addr.s_addr = htonl(INADDR_ANY);

servaddr.sin_port = htons(SERV_PORT);

Bind(sockfd, (SA *) &servaddr, sizeof(servaddr));

dg_echo(sockfd, (SA *) &cliaddr, sizeof(cliaddr));

}

dg_echo.c

void dg_echo(int sockfd, SA *pcliaddr, socklen_t clilen) {

int n;

socklen_t len;

char mesg[MAXLINE];

for ( ; ; ) {

len = clilen;

n = Recvfrom(sockfd, mesg, MAXLINE, 0, pcliaddr, &len);

Sendto(sockfd, mesg, n, 0, pcliaddr, len);

}

}

Answer should be short.

Explanation / Answer

The appropriate command is as follows:

nc <server_ip> <SERV_PORT>

We have 2 variables here server_ip and SERV_PORT. SERV_PORT is same as that defined in udpserver01.c. On the other hand since server_ip was specified as INADDR_ANY in the code, you can use 2 values for it depending on your situation - if both server and client are no the same pc, use 127.0.0.1, otherwise use the ip address of the server (use ifconfig command to check the ip).

Examples:

Sample pc at port 4000 : nc 127.0.0.1 4000

Different pc at port 4000 : nc 192.168.20.3 4000

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