Initial commit for networking playground in C
This commit is contained in:
commit
49f044782e
GPG Key ID:
2FF292A70A383B0B
|
|
@ -0,0 +1,10 @@
|
|||
all clean:
|
||||
cd src && $(MAKE) $@
|
||||
|
||||
samples:
|
||||
cd examples && $(MAKE)
|
||||
|
||||
clean-samples:
|
||||
cd examples && $(MAKE) clean
|
||||
|
||||
.PHONY: clean
|
||||
|
|
@ -0,0 +1,4 @@
|
|||
Networking
|
||||
==========
|
||||
|
||||
A playground to learn network programming in C.
|
||||
|
|
@ -0,0 +1,12 @@
|
|||
all: client server
|
||||
|
||||
client: client.c
|
||||
$(CC) $< -o $@
|
||||
|
||||
server: server.c
|
||||
$(CC) $< -o $@
|
||||
|
||||
clean:
|
||||
rm server client
|
||||
|
||||
.PHONY: clean
|
||||
|
|
@ -0,0 +1,86 @@
|
|||
|
||||
#include <sys/types.h>
|
||||
#include <sys/socket.h>
|
||||
#include <netdb.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <unistd.h>
|
||||
#include <string.h>
|
||||
|
||||
#define BUF_SIZE 500
|
||||
|
||||
int main(int argc, char *argv[])
|
||||
{
|
||||
struct addrinfo hints;
|
||||
struct addrinfo *result, *rp;
|
||||
int sfd, s, j;
|
||||
size_t len;
|
||||
ssize_t nread;
|
||||
char buf[BUF_SIZE];
|
||||
|
||||
if (argc < 3) {
|
||||
fprintf(stderr, "Usage: %s host port msg...\n", argv[0]);
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
|
||||
/* Obtain address(es) matching host/port */
|
||||
|
||||
memset(&hints, 0, sizeof(struct addrinfo));
|
||||
hints.ai_family = AF_UNSPEC; /* Allow IPv4 or IPv6 */
|
||||
hints.ai_socktype = SOCK_DGRAM; /* Datagram socket */
|
||||
hints.ai_flags = 0;
|
||||
hints.ai_protocol = 0; /* Any protocol */
|
||||
|
||||
s = getaddrinfo(argv[1], argv[2], &hints, &result);
|
||||
if (s != 0) {
|
||||
fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(s));
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
|
||||
/* getaddrinfo() returns a list of address structures.
|
||||
Try each address until we successfully connect(2).
|
||||
If socket(2) (or connect(2)) fails, we (close the socket
|
||||
and) try the next address. */
|
||||
|
||||
for (rp = result; rp != NULL; rp = rp->ai_next) {
|
||||
sfd = socket(rp->ai_family, rp->ai_socktype,
|
||||
rp->ai_protocol);
|
||||
if (sfd == -1)
|
||||
continue;
|
||||
|
||||
if (connect(sfd, rp->ai_addr, rp->ai_addrlen) != -1)
|
||||
break; /* Success */
|
||||
|
||||
close(sfd);
|
||||
}
|
||||
freeaddrinfo(result); /* No longer needed */
|
||||
|
||||
/* Send remaining command-line arguments as separate
|
||||
datagrams, and read responses from server */
|
||||
|
||||
for (j = 3; j < argc; j++) {
|
||||
len = strlen(argv[j]) + 1;
|
||||
/* +1 for terminating null byte */
|
||||
|
||||
if (len > BUF_SIZE) {
|
||||
fprintf(stderr,
|
||||
"Ignoring long message in argument %d\n", j);
|
||||
continue;
|
||||
}
|
||||
|
||||
if (write(sfd, argv[j], len) != len) {
|
||||
fprintf(stderr, "partial/failed write\n");
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
|
||||
nread = read(sfd, buf, BUF_SIZE);
|
||||
if (nread == -1) {
|
||||
perror("read");
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
|
||||
printf("Received %zd bytes: %s\n", nread, buf);
|
||||
}
|
||||
|
||||
exit(EXIT_SUCCESS);
|
||||
}
|
||||
|
|
@ -0,0 +1,92 @@
|
|||
#include <sys/types.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <unistd.h>
|
||||
#include <string.h>
|
||||
#include <sys/socket.h>
|
||||
#include <netdb.h>
|
||||
|
||||
#define BUF_SIZE 500
|
||||
|
||||
int main(int argc, char *argv[])
|
||||
{
|
||||
struct addrinfo hints;
|
||||
struct addrinfo *result, *rp;
|
||||
int sfd, s;
|
||||
struct sockaddr_storage peer_addr;
|
||||
socklen_t peer_addr_len;
|
||||
ssize_t nread;
|
||||
char buf[BUF_SIZE];
|
||||
|
||||
if (argc != 2) {
|
||||
fprintf(stderr, "Usage: %s port\n", argv[0]);
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
|
||||
memset(&hints, 0, sizeof(struct addrinfo));
|
||||
hints.ai_family = AF_UNSPEC; /* Allow IPv4 or IPv6 */
|
||||
hints.ai_socktype = SOCK_DGRAM; /* Datagram socket */
|
||||
hints.ai_flags = AI_PASSIVE; /* For wildcard IP address */
|
||||
hints.ai_protocol = 0; /* Any protocol */
|
||||
hints.ai_canonname = NULL;
|
||||
hints.ai_addr = NULL;
|
||||
hints.ai_next = NULL;
|
||||
|
||||
s = getaddrinfo(NULL, argv[1], &hints, &result);
|
||||
if (s != 0) {
|
||||
fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(s));
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
|
||||
/* getaddrinfo() returns a list of address structures.
|
||||
Try each address until we successfully bind(2).
|
||||
If socket(2) (or bind(2)) fails, we (close the socket
|
||||
and) try the next address. */
|
||||
|
||||
for (rp = result; rp != NULL; rp = rp->ai_next) {
|
||||
sfd = socket(rp->ai_family, rp->ai_socktype,
|
||||
rp->ai_protocol);
|
||||
if (sfd == -1)
|
||||
continue;
|
||||
|
||||
if (bind(sfd, rp->ai_addr, rp->ai_addrlen) == 0)
|
||||
break; /* Success */
|
||||
|
||||
close(sfd);
|
||||
}
|
||||
|
||||
if (rp == NULL) { /* No address succeeded */
|
||||
fprintf(stderr, "Could not bind\n");
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
|
||||
freeaddrinfo(result); /* No longer needed */
|
||||
|
||||
/* Read datagrams and echo them back to sender */
|
||||
|
||||
for (;;) {
|
||||
peer_addr_len = sizeof(struct sockaddr_storage);
|
||||
nread = recvfrom(sfd, buf, BUF_SIZE, 0,
|
||||
(struct sockaddr *) &peer_addr, &peer_addr_len);
|
||||
if (nread == -1)
|
||||
continue; /* Ignore failed request */
|
||||
|
||||
char host[NI_MAXHOST], service[NI_MAXSERV];
|
||||
|
||||
s = getnameinfo((struct sockaddr *) &peer_addr,
|
||||
peer_addr_len, host, NI_MAXHOST,
|
||||
service, NI_MAXSERV, NI_NUMERICSERV);
|
||||
if (s == 0) {
|
||||
printf("Received %zd bytes from %s:%s\n",
|
||||
nread, host, service);
|
||||
printf("Data: %s\n", buf);
|
||||
} else {
|
||||
fprintf(stderr, "getnameinfo: %s\n", gai_strerror(s));
|
||||
}
|
||||
|
||||
if (sendto(sfd, buf, nread, 0,
|
||||
(struct sockaddr *) &peer_addr,
|
||||
peer_addr_len) != nread)
|
||||
fprintf(stderr, "Error sending response\n");
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,15 @@
|
|||
DISTDIR=../dist
|
||||
|
||||
all: dist networking
|
||||
|
||||
networking: networking.o
|
||||
$(CC) ${DISTDIR}/$< -o ${DISTDIR}/$@
|
||||
|
||||
networking.o: networking.c
|
||||
$(CC) -c $< -o ${DISTDIR}/$@
|
||||
|
||||
dist:
|
||||
mkdir -p ${DISTDIR}
|
||||
|
||||
clean:
|
||||
rm -r ${DISTDIR}
|
||||
|
|
@ -0,0 +1,91 @@
|
|||
#include "networking.h"
|
||||
|
||||
#include <sys/types.h>
|
||||
#include <sys/socket.h>
|
||||
#include <netdb.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <unistd.h>
|
||||
#include <string.h>
|
||||
|
||||
#define BUF_SIZE 500
|
||||
|
||||
|
||||
void client_run(const char *const host,
|
||||
const char *const port,
|
||||
const char *const msg) {
|
||||
|
||||
struct addrinfo hints;
|
||||
struct addrinfo *result, *rp;
|
||||
int sfd, s, j;
|
||||
size_t len;
|
||||
ssize_t nread;
|
||||
char buf[BUF_SIZE];
|
||||
|
||||
/* Obtain address(es) matching host/port */
|
||||
memset(&hints, 0, sizeof(struct addrinfo));
|
||||
hints.ai_family = AF_UNSPEC; /* Allow IPv4 or IPv6 */
|
||||
hints.ai_socktype = SOCK_DGRAM; /* Datagram socket */
|
||||
hints.ai_flags = 0;
|
||||
hints.ai_protocol = 0; /* Any protocol */
|
||||
|
||||
s = getaddrinfo(host, port, &hints, &result);
|
||||
if (s != 0) {
|
||||
fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(s));
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
|
||||
/* getaddrinfo() returns a list of address structures.
|
||||
* try each address untill we succesfully connect(2).
|
||||
* If socket(2) (or connect(2)) fails, we (close the socket
|
||||
* and) try the next address. */
|
||||
|
||||
for (rp = result; rp != NULL; rp = rp->ai_next) {
|
||||
sfd = socket(rp->ai_family, rp->ai_socktype,
|
||||
rp->ai_protocol);
|
||||
if (sfd == -1)
|
||||
continue;
|
||||
|
||||
if (connect(sfd, rp->ai_addr, rp->ai_addrlen) != -1)
|
||||
break; /* Success */
|
||||
|
||||
close(sfd);
|
||||
}
|
||||
|
||||
if (rp == NULL) { /* No address succeeded */
|
||||
fprintf(stderr, "Could not connect\n");
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
|
||||
freeaddrinfo(result); /* No longer needed */
|
||||
|
||||
/* Send remaining command-line arguments as separate
|
||||
datagrams, and read responses from server */
|
||||
|
||||
/* TODO: Adapt this to use msg instead */
|
||||
for (j = 3; j < argc; j++) {
|
||||
len = strlen(argv[j]) + 1;
|
||||
/* +1 for terminating null byte */
|
||||
|
||||
if (len > BUF_SIZE) {
|
||||
fprintf(stderr,
|
||||
"Ignoring long message in argument %d\n", j);
|
||||
continue;
|
||||
}
|
||||
|
||||
if (write(sfd, argv[j], len) != len) {
|
||||
fprintf(stderr, "partial/failed write\n");
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
|
||||
nread = read(sfd, buf, BUF_SIZE);
|
||||
if (nread == -1) {
|
||||
perror("read");
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
|
||||
printf("Received %zd bytes: %s\n", nread, buf);
|
||||
}
|
||||
|
||||
exit(EXIT_SUCCESS);
|
||||
}
|
||||
|
|
@ -0,0 +1,35 @@
|
|||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
|
||||
#include "networking.h"
|
||||
|
||||
void usage(const char *const progname);
|
||||
void help(void);
|
||||
|
||||
int main(int argc, char *argv[]) {
|
||||
(void) fprintf(stdout, "%s\n", "Networking with C");
|
||||
|
||||
if (argc < 3) {
|
||||
usage(argv[0]);
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
|
||||
exit(EXIT_SUCCESS);
|
||||
}
|
||||
|
||||
void usage(const char *const progname) {
|
||||
|
||||
fprintf(stderr, "Usage: %s [OPTION] host port msg...\n", progname);
|
||||
help();
|
||||
}
|
||||
|
||||
void help(void) {
|
||||
fprintf(stdout, "\t%s\n", "OPTIONS:");
|
||||
fprintf(stdout, "\t\t%s\n\t\t%s\n", "-s", "--server");
|
||||
fprintf(stdout, "\t\t%s\n\n", "Run the program as a server.");
|
||||
fprintf(stdout, "\t\t%s\n\t\t%s\n", "-c", "--client");
|
||||
fprintf(stdout, "\t\t%s\n\n", "Run the program as a client.");
|
||||
fprintf(stdout, "\t%s\n", "Running as a client is the default behavior.");
|
||||
}
|
||||
|
||||
|
||||
|
|
@ -0,0 +1,8 @@
|
|||
#ifndef NETWORKING_H
|
||||
#define NETWORKING_H
|
||||
|
||||
void client_run(const char *const host,
|
||||
const char *const port,
|
||||
const char *const msg);
|
||||
|
||||
#endif /* NETWORKING_H */
|
||||
Loading…
Reference in New Issue