From f9f1b64dfdf284fd04b4719f205e181992e16887 Mon Sep 17 00:00:00 2001
From: ingenzi <vany.ingenzi@student.uclouvain.be>
Date: Fri, 18 Mar 2022 10:49:36 +0100
Subject: [PATCH] Modified utils and added the code for the inginious task
---
headers/our_utils.h | 6 +-
headers/receiver.h | 23 +++-
headers/receiver_utils.h | 26 ----
receiver | Bin 0 -> 28000 bytes
sender | Bin 0 -> 23528 bytes
src/our_utils.c | 16 +--
src/receiver.c | 2 +-
src/receiver_utils.c | 5 +-
temp/get_ipv6_address.c | 253 +++++++++++++++++++++++++++++++++++++++
9 files changed, 288 insertions(+), 43 deletions(-)
delete mode 100644 headers/receiver_utils.h
create mode 100755 receiver
create mode 100755 sender
create mode 100644 temp/get_ipv6_address.c
diff --git a/headers/our_utils.h b/headers/our_utils.h
index 8647c5c..421c0da 100644
--- a/headers/our_utils.h
+++ b/headers/our_utils.h
@@ -44,11 +44,11 @@ int create_socket(struct sockaddr_in6 *source_addr, int src_port, struct sockadd
/* Block the caller until a message is received on sfd,
* and connect the socket to the source addresse of the received message
* @sfd: a file descriptor to a bound socket but not yet connected
- * @buffer : a non null buffer where it writes the received message.
- * @len: after reading the message it sents the amount bytes read in len.
* @return: 0 in case of success, -1 otherwise
+ * @POST: This call is idempotent, it does not 'consume' the data of the message,
+ * and could be repeated several times blocking only at the first call.
*/
-int wait_for_client(int sfd, int MAX_MESSAGE_SIZE, char * buffer, ssize_t * len);
+int wait_for_client(int sfd);
#endif
\ No newline at end of file
diff --git a/headers/receiver.h b/headers/receiver.h
index c1fcb39..7bdbfea 100644
--- a/headers/receiver.h
+++ b/headers/receiver.h
@@ -1,4 +1,25 @@
/**
* @file receiver.h
* @brief This header contains all the structures and functions definitions that ae going to be used by the receiver.c
- */
\ No newline at end of file
+ */
+
+#ifndef __RECEIVER_UTILS_
+#define __RECEIVER_UTILS_
+
+/* We are using 8 bits to encode the seqnum therefore to fight redondance our window is of 2**(8)/2 */
+#define MAX_SELECTIVE_REPEAT_WINDOW 8
+
+/* Represent the receiver's connection state */
+typedef struct __attribute__((__packed__))
+{
+} con_state_t;
+
+
+/**
+ * Loop reading on socket and printing to the stdout
+ * @sfd : The socket file descriptor. It is both bound and connected.
+ * @return: as soon as the whole transfer is done.
+ */
+void receiver_read_write_loop(int sfd);
+
+#endif
\ No newline at end of file
diff --git a/headers/receiver_utils.h b/headers/receiver_utils.h
deleted file mode 100644
index 572e45a..0000000
--- a/headers/receiver_utils.h
+++ /dev/null
@@ -1,26 +0,0 @@
-/**
- * @file receiver_utils.h
- * @brief This header contains utils will be used by the receiver
- * @date 2022-03-17
- */
-
-#ifndef __RECEIVER_UTILS_
-#define __RECEIVER_UTILS_
-
-/* We are using 8 bits to encode the seqnum therefore to fight redondance our window is of 2**(8)/2 */
-#define MAX_SELECTIVE_REPEAT_WINDOW 8
-
-/* Represent the receiver's connection state */
-typedef struct __attribute__((__packed__))
-{
-} con_state_t;
-
-
-/**
- * Loop reading on socket and printing to the stdout
- * @sfd : The socket file descriptor. It is both bound and connected.
- * @return: as soon as the whole transfer is done.
- */
-void receiver_read_write_loop(int sfd);
-
-#endif
\ No newline at end of file
diff --git a/receiver b/receiver
new file mode 100755
index 0000000000000000000000000000000000000000..719d1d48efb0681ed0c3ffc65d75b512bda1a658
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diff --git a/src/our_utils.c b/src/our_utils.c
index 0628f01..c07a716 100644
--- a/src/our_utils.c
+++ b/src/our_utils.c
@@ -89,22 +89,18 @@ int create_socket(struct sockaddr_in6 *source_addr, int src_port, struct sockadd
return -1;
}
-
-int wait_for_client(int sfd, int MAX_MESSAGE_SIZE, char * buffer, ssize_t * len)
+int wait_for_client(int sfd)
{
+ int MAX_MESSAGE_SIZE = 1024;
+ uint8_t buff[MAX_MESSAGE_SIZE]; // allocate the receive buffer on the stack
struct sockaddr_storage peer_addr; // allocate the peer's address on the stack. It will be initialized when we receive a message
socklen_t peer_addr_len = sizeof(struct sockaddr_storage); // variable that will contain the length of the peer's address
- *len = recvfrom(sfd, buffer, MAX_MESSAGE_SIZE, MSG_PEEK, (struct sockaddr *) &peer_addr, &peer_addr_len);
- if (*len == -1)
- {
- ERROR("On recvfrom while waiting for client");
+ ssize_t amount_read = recvfrom(sfd, buff, MAX_MESSAGE_SIZE, MSG_PEEK, (struct sockaddr *) &peer_addr, &peer_addr_len);
+ if (amount_read == -1){
return -1;
}
- int err = connect(sfd, (struct sockaddr *) &peer_addr, sizeof(struct sockaddr_storage));
+ int err = connect(sfd, (struct sockaddr *) &peer_addr, sizeof(struct sockaddr_storage));
if (err != EISCONN && err != 0)
- {
- ERROR("When connecting to client");
return -1;
- }
return 0;
}
\ No newline at end of file
diff --git a/src/receiver.c b/src/receiver.c
index 9afa977..ef5a129 100644
--- a/src/receiver.c
+++ b/src/receiver.c
@@ -13,7 +13,7 @@
#include "log.h"
#include "packet_interface.h"
#include "our_utils.h"
-#include "receiver_utils.h"
+#include "receiver.h"
int print_usage(char *prog_name) {
ERROR("Usage:\n\t%s [-s stats_filename] listen_ip listen_port", prog_name);
diff --git a/src/receiver_utils.c b/src/receiver_utils.c
index 9722c55..fdb3e22 100644
--- a/src/receiver_utils.c
+++ b/src/receiver_utils.c
@@ -3,7 +3,7 @@
#include "packet_interface.h"
#include <poll.h>
#include "our_utils.h"
-#include "receiver_utils.h"
+#include "receiver.h"
int send_data_if_inneed()
{
@@ -74,7 +74,7 @@ int connect_to_a_client(int sfd, pkt_t * init_pkt)
char * buffer[PKT_MAX_LEN];
ssize_t written_in_buffer;
// We suppose that the first contact is going to be our client no need to check for more
- int err = wait_for_client(sfd, PKT_MAX_LEN, (char *)buffer, &written_in_buffer);
+ int err = wait_for_client(sfd);
if (err != 0) return -1;
DEBUG_DUMP(buffer, written_in_buffer);
@@ -105,6 +105,7 @@ void receiver_read_write_loop(int sfd)
int err = connect_to_a_client(sfd, pkt);
if (err == 0)
return;
+
// Handle initial packet.
err = fwrite((void *) pkt_get_payload(pkt), sizeof(char), pkt_get_length(pkt), stdout);
diff --git a/temp/get_ipv6_address.c b/temp/get_ipv6_address.c
new file mode 100644
index 0000000..d7f3880
--- /dev/null
+++ b/temp/get_ipv6_address.c
@@ -0,0 +1,253 @@
+#include <arpa/inet.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <poll.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+/*************************** Utilities ******************************/
+
+
+/*************************** Start Q1 *******************************/
+/* Resolve the resource name to an usable IPv6 address
+ * @address: The name to resolve
+ * @rval: Where the resulting IPv6 address descriptor should be stored
+ * @return: NULL if it succeeded, or a pointer towards
+ * a string describing the error if any.
+ * (const char* means the caller cannot modify or free the return value,
+ * so do not use malloc!)
+ */
+const char * real_address(const char *address, struct sockaddr_in6 *rval)
+{
+ struct addrinfo hints;
+ struct addrinfo *result;
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_family = AF_INET6;
+ hints.ai_socktype = SOCK_DGRAM;
+ hints.ai_flags = AI_CANONNAME;
+ hints.ai_protocol = 0;
+ int res = getaddrinfo(address, NULL, &hints, &result);
+ if ( res != 0 )
+ return gai_strerror(res);
+ rval = (struct sockaddr_in6 *) memcpy( (void *) rval, result->ai_addr, sizeof(struct sockaddr_in6));
+ freeaddrinfo(result);
+ return NULL;
+}
+/*************************** End Q1 *******************************/
+
+/*************************** Start Q2 *****************************/
+void ipv6_to_str_unexpanded(char *str, const struct in6_addr *addr) {
+ sprintf(str, "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x",
+ (int)addr->s6_addr[0], (int)addr->s6_addr[1],
+ (int)addr->s6_addr[2], (int)addr->s6_addr[3],
+ (int)addr->s6_addr[4], (int)addr->s6_addr[5],
+ (int)addr->s6_addr[6], (int)addr->s6_addr[7],
+ (int)addr->s6_addr[8], (int)addr->s6_addr[9],
+ (int)addr->s6_addr[10], (int)addr->s6_addr[11],
+ (int)addr->s6_addr[12], (int)addr->s6_addr[13],
+ (int)addr->s6_addr[14], (int)addr->s6_addr[15]);
+}
+
+int create_socket_bind(struct sockaddr_in6 * source_addr)
+{
+ // TODO: Create a IPv6 socket supporting datagrams
+ int sock = socket(AF_INET6, SOCK_DGRAM, 0);
+ // TODO: Bind it to the source
+ int err = bind(sock, (struct sockaddr *) source_addr, sizeof(struct sockaddr_in6));
+ if (err == -1)
+ return -1;
+
+ char text[100];
+ ipv6_to_str_unexpanded(text, &(source_addr->sin6_addr));
+ //const char * addr_str = inet_ntop(AF_INET6, (void *) &(source_addr->sin6_addr), text, 100);
+ fprintf(stderr, "Successfully bound to IPv6 address : %s, port : %d\n", text, ntohs(source_addr->sin6_port));
+ return sock;
+}
+
+int create_socket_connect(struct sockaddr_in6 * dest_addr)
+{
+ int sock = socket(AF_INET6, SOCK_DGRAM, 0);
+ int err = connect(sock, (struct sockaddr *) dest_addr, sizeof(*dest_addr));
+ if (err == -1)
+ return -1;
+ char text[100];
+ ipv6_to_str_unexpanded(text, &(dest_addr->sin6_addr));
+ fprintf(stderr, "Successfully connected to IPv6 addresss: %s, port : %d\n", text, ntohs(dest_addr->sin6_port));
+ return sock;
+}
+
+/* Creates a socket and initialize it
+ * @source_addr: if !NULL, the source address that should be bound to this socket
+ * @src_port: if >0, the port on which the socket is listening
+ * @dest_addr: if !NULL, the destination address to which the socket should send data
+ * @dst_port: if >0, the destination port to which the socket should be connected
+ * @return: a file descriptor number representing the socket,
+ * or -1 in case of error (explanation will be printed on stderr)
+ */
+int create_socket(struct sockaddr_in6 *source_addr, int src_port, struct sockaddr_in6 *dest_addr, int dst_port)
+{
+ if ( source_addr != NULL && dest_addr == NULL )
+ {
+ source_addr->sin6_port = htons(src_port);
+ return create_socket_bind(source_addr);
+ } else if ( source_addr == NULL && dest_addr != NULL ){
+ dest_addr->sin6_port = htons(dst_port);
+ return create_socket_connect(dest_addr);
+ }
+ return -1;
+}
+/*************************** End Q2 *******************************/
+
+/*************************** Start Q3 *****************************/
+
+int handle_event(struct pollfd * pfd, ssize_t MAX_SIZE, char * buff)
+{
+ if (pfd->revents & POLLIN){
+ ssize_t read_bytes = read(pfd->fd, (void *) buff, MAX_SIZE);
+ if (read_bytes == -1)
+ return 0;
+ size_t err = fwrite("Incoming : \n\t", sizeof(char), 14, stderr);
+ err = fflush(stderr);
+ err = fwrite((void *) buff, sizeof(char), read_bytes, stdout);
+ if (err == 0)
+ fprintf(stderr, "Nonesense\n");
+ err = fflush(stdout);
+ return 1;
+ } else if (pfd->events & POLLHUP){ /*EOF or Error*/
+ fprintf(stderr, "Error...\n");
+ return 0;
+ } else { /* POLLOUT */
+ size_t err;
+ size_t read_bytes = fread(buff, sizeof(char), MAX_SIZE, stdin);
+ if (read_bytes != 0)
+ {
+ err = write(pfd->fd, (void *) buff, read_bytes);
+ if (err == 0)
+ return 0;
+ err = fwrite("\n Sent\n", sizeof(char), 8, stderr);
+ }
+ err = fflush(stderr);
+ return 1;
+ }
+}
+
+/* Loop reading a socket and printing to stdout,
+ * while reading stdin and writing to the socket
+ * @sfd: The socket file descriptor. It is both bound and connected.
+ * @return: as soon as stdin signals EOF
+ */
+void read_write_loop(int sfd)
+{
+ struct pollfd * pfds;
+ pfds = (struct pollfd *) calloc(2, sizeof(struct pollfd));
+ if (pfds == NULL)
+ return;
+ pfds[0].fd = sfd;
+ pfds[0].events = POLLIN | POLLOUT;
+
+ pfds[1].fd = 0; // stdin is defined to be file descriptor 0
+ pfds[1].events = POLLIN ;
+
+ int nb_open_fds = 2;
+ int MAX_SIZE = 1024; // Bytes
+ char buff[MAX_SIZE];
+ size_t writen;
+ while (nb_open_fds > 1)
+ {
+ int ready = poll(pfds, 2, -1);
+ if (ready == -1)
+ return;
+
+ if (pfds[0].revents & POLLIN){
+ ssize_t read_bytes = read(pfds[0].fd, (void *) buff, MAX_SIZE);
+ if (read_bytes == -1)
+ return;
+ writen = fwrite((void *) buff, sizeof(char), read_bytes, stdout);
+ writen = fflush(stdout);
+ } else if ((pfds[0].revents & POLLHUP) || (pfds[0].revents & POLLERR)){
+ nb_open_fds--;
+ } else if ((pfds[0].revents & POLLOUT) && (pfds[1].revents & POLLIN)){
+ size_t read_bytes = fread(buff, sizeof(char), 1, stdin);
+ writen = fflush(stdin);
+ writen = write(pfds[0].fd, (void *) buff, read_bytes);
+ size_t e = -1;
+ if (writen == e || feof(stdin) != 0)
+ return;
+ }
+ }
+}
+/*************************** End Q3 *******************************/
+
+/*************************** Start Q4 *****************************/
+
+/* Block the caller until a message is received on sfd,
+ * and connect the socket to the source addresse of the received message
+ * @sfd: a file descriptor to a bound socket but not yet connected
+ * @return: 0 in case of success, -1 otherwise
+ * @POST: This call is idempotent, it does not 'consume' the data of the message,
+ * and could be repeated several times blocking only at the first call.
+ */
+int wait_for_client(int sfd)
+{
+ int MAX_MESSAGE_SIZE = 1024;
+ uint8_t buff[MAX_MESSAGE_SIZE]; // allocate the receive buffer on the stack
+ struct sockaddr_storage peer_addr; // allocate the peer's address on the stack. It will be initialized when we receive a message
+ socklen_t peer_addr_len = sizeof(struct sockaddr_storage); // variable that will contain the length of the peer's address
+ ssize_t amount_read = recvfrom(sfd, buff, MAX_MESSAGE_SIZE, MSG_PEEK, (struct sockaddr *) &peer_addr, &peer_addr_len);
+ if (amount_read == -1){
+ return -1;
+ }
+ int err = connect(sfd, (struct sockaddr *) &peer_addr, sizeof(struct sockaddr_storage));
+ if (err != EISCONN && err != 0)
+ return -1;
+ return 0;
+}
+
+/*************************** End Q4 *******************************/
+
+int main(int argc, char const *argv[])
+{
+ if (argc != 4)
+ {
+ fprintf(stderr, "./get_ipv6_addr <name_to_resolve> <port> <flag>\n - <flag> ::= c `|` s\n");
+ return (EXIT_SUCCESS);
+ }
+
+ // Name resolving
+ struct sockaddr_in6 * addr = (struct sockaddr_in6 *) malloc(sizeof(struct sockaddr_in6));
+ const char * res = real_address(argv[1], addr);
+ if (res != NULL)
+ {
+ fprintf(stderr, "An error occured when name resolving :\n\t%s\n", res);
+ return (EXIT_FAILURE);
+ }
+
+ // Socket Binding or Connecting
+ int socket;
+ if (strncasecmp(argv[3], "c", 1) == 0)
+ {
+ socket = create_socket(NULL, 0, addr, atoi(argv[2]));
+ } else if (strncasecmp(argv[3], "s", 1) == 0)
+ {
+ socket = create_socket(addr, atoi(argv[2]), NULL, 0);
+ wait_for_client(socket);
+ }
+ if (socket == -1)
+ {
+ fprintf(stderr, "An error occured when connecting/binding to address\n");
+ return (EXIT_FAILURE);
+ }
+
+ read_write_loop(socket);
+
+ close(socket);
+ // Writing and reading
+ return (EXIT_SUCCESS );
+}
\ No newline at end of file
--
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