[ Foro de C ]

Listado de sockets con makefile, listado confuso, un ayuda porfa

CC=gcc
CFLAGS=-Wall
LDFLAGS=

all: server client

server: server.o
$(CC) $(LDFAGS) server.o -o server

client: client.o
$(CC) $(LDLAGS) client.o -o client

server.o: server.c
$(CC) $(CFLAGS) -c server.c -o server.o

client.o: client.c
$(CC) $(CFLAGS) -c client.c -o client.o

clean:
rm -f *.o client server











#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <sys/socket.h>
#include <netinet/in.h>

static void string_modificator(char *string)
{
size_t len = strlen(string);
int i;
for(i = 0; i < len; i++) {
if ((i % 2) == 0) {
string[i] = toupper(string[i]);
} else {
string[i] = tolower(string[i]);
}
}
}

static void handle_connection(int cfd)
{
char string[200+1];
memset(string, '\0', sizeof(string)); /* or a bzero ;) */
read(cfd, string, sizeof(string) - 1);
printf("message received (fd = %d): %s\n", cfd, string);
string_modificator(string);
write(cfd, string, strlen(string) + 1);
printf("message send (fd = %d): %s\n", cfd, string);
}

int main(int argc,char *argv[])
{
int sfd,cfd; /*sfd=server file descriptor, cfs= client file descriptor */
int n; /*and n a return value */

struct sockaddr_in servaddr,cliaddr;
socklen_t clilen;

sfd=socket(AF_INET,SOCK_STREAM,0);
if(sfd < 0){
printf("Socket could not be created!\n");
exit(1);
}









#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <sys/socket.h>
#include <netinet/in.h>

#define MAX_FD_HANDLERS 10

static int fd_handlers[MAX_FD_HANDLERS] = { 0 };

/* we need to keep ourselves a list of file descriptors for the open connections
* and manage it with fd_handlers_add and fd_handlers_remove*/
static void fd_handlers_add(int fd)
{
int i;
for(i = 0; i < MAX_FD_HANDLERS; i++) {
if(fd_handlers[i] == 0) {
fd_handlers[i] = fd;
break;
}
}
}

static void fd_handlers_remove(int fd)
{
int i;
for(i = 0; i < MAX_FD_HANDLERS; i++) {
if(fd_handlers[i] == fd)
fd_handlers[i] = 0;
}
}

static void fd_handlers_build_fd_set(fd_set *rfds)
{
int i;
FD_ZERO(rfds); /*initializes the list */
for(i = 0; i < MAX_FD_HANDLERS; i++) {
if(fd_handlers[i] != 0) {
FD_SET(fd_handlers[i], rfds);
}
}
}

static int fd_handlers_get_max_fd(fd_set *rfds)
{
int i, maxfd = 0;
for(i = 0; i < MAX_FD_HANDLERS; i++) {
if(fd_handlers[i] > maxfd)
maxfd = fd_handlers[i];
}
return maxfd;
}

static void string_modificator(char *string)
{
size_t len = strlen(string);
int i;
for (i = 0; i < len; i++) {
if ((i % 2) == 0) {
string[i] = toupper(string[i]);
} else {
string[i] = tolower(string[i]);
}
}
}

static void handle_server_event(int sfd)
{
struct sockaddr_in cliaddr;
socklen_t clilen = sizeof(cliaddr);

/* accept new incomming connection */
int cfd = accept(sfd, (struct sockaddr *) &cliaddr, &clilen);
printf("incoming connection (fd = %d)!\n", cfd);
/* store fd for select loop */
fd_handlers_add(cfd);
}

static void handle_client_event(int cfd)
{
char string[200+1];
memset(string, '\0', sizeof(string));

read(cfd, string, sizeof(string)-1);
printf("message received (fd = %d): %s\n", cfd, string);
string_modificator(string);
write(cfd, string, strlen(string) + 1);
printf("message send (fd = %d): %s\n", cfd, string);

close(cfd);
/* remove fd from select loop */
fd_handlers_remove(cfd);
}

int main(int argc, char *argv[])
{
int sfd, n;
struct sockaddr_in servaddr;

sfd = socket(AF_INET, SOCK_STREAM, 0);
if (sfd < 0) {
printf("Socket could not be created!\n");
exit(1);
}
fd_handlers_add(sfd);

bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
servaddr.sin_port = htons(5000);

n = bind(sfd, (struct sockaddr *) &servaddr, sizeof(servaddr));
if (n != 0) {
perror("bind");
exit(1);
}

if(listen(sfd, 10) != 0) {
perror("listen");
}
printf("Start listening...\n");
for (;;) {
int rv;
fd_set rfds;

/* build fd set */
fd_handlers_build_fd_set(&rfds);

/* get max fd */
int max_fd = fd_handlers_get_max_fd(&rfds);

/* with select we look at all the read file descriptors */
rv = select(max_fd + 1, &rfds, NULL, NULL, NULL);

if (rv < 0) { /* select error! */
perror("select");
} else if (rv > 0) { /* something happened! */
int i;
printf("Data is available now.\n");

for(i = 0; i < MAX_FD_HANDLERS; i++) {
if(fd_handlers[i] == 0)
continue;

/* FD_ISSET returns true if something happened on the file descriptor which
*the select function noticed, false otherwise */
if(FD_ISSET(fd_handlers[i], &rfds)) {
if (fd_handlers[i] == sfd) {
/* handle new incoming connection with accept*/
handle_server_event(sfd);
} else { /* handle client request */
handle_client_event(fd_handlers[i]);
}
}
}
}
}
close(sfd);

return 0;
}














#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>

int main(int argc,char *argv[])
{
int fd;
struct sockaddr_in cliaddr;

/* create socket */
fd=socket(AF_INET,SOCK_STREAM,0);
if(fd < 0){
printf("Socket could not be created!\n");
exit(1);
}

/* set address and destination port */
bzero(&cliaddr,sizeof(cliaddr));
cliaddr.sin_family = AF_INET;
cliaddr.sin_port=htons(5000);

/* convert destination ip to correct format */
if(inet_pton(AF_INET, "127.0.0.1", &cliaddr.sin_addr)<=0)
{
printf("\n inet_pton error occured\n");
return 1;
}

/* connect to server */
if(connect(fd, (struct sockaddr *)&cliaddr, sizeof(cliaddr))) {
perror("connect");
return 1;
}

char msg[200] = { 0 };
printf("type msg: ");
scanf("%s", msg);

write(fd, msg, strlen(msg) + 1);
printf("message send: %s\n", msg);
read(fd, msg, sizeof(msg));
printf("message received: %s\n", msg);

close(fd);

return 0;
}










Solo entiendo el 40% de los listados, hey profe, echame una mano que esta haciendo este listado de sockets?.

Disecciona el listado