Duzy commit ze smieciami

1 files changed, 0 insertions, 240 deletions

diff --git a/Semestr 4/sieci/pracownia1/traceroute.c b/Semestr 4/sieci/pracownia1/traceroute.c
deleted file mode 100644
index 0e51c14..0000000
--- a/Semestr 4/sieci/pracownia1/traceroute.c
+++ /dev/null
@@ -1,240 +0,0 @@
-/* Pracownia programistyczna nr 1 - traceroute
- * Imię i nazwisko: Franciszek Malinka
- * Nr indeksu:      316093
- */
-
-#include <stdio.h>
-#include <errno.h>
-#include <netinet/ip.h>
-#include <arpa/inet.h>
-#include <strings.h>
-#include <string.h>
-#include <stdlib.h>
-#include <netinet/ip_icmp.h>
-#include <assert.h>
-#include <time.h>
-#include <sys/types.h>
-#include <unistd.h>
-#include <stdbool.h>
-
-#define MAX_TTL 30
-#define MESSAGES_PER_TTL 3
-#define NO_MESSAGES -1
-#define TOO_FEW_MESSAGES -2137
-
-void print_as_bytes (unsigned char* buff, ssize_t length)
-{
-	for (ssize_t i = 0; i < length; i++, buff++)
-		printf ("%.2x ", *buff);	
-}
-
-void debug_received(uint8_t *buffer, struct sockaddr_in *sender, int packet_len) {
-    char ip_str[20];
-    inet_ntop(AF_INET, &(sender->sin_addr), ip_str, sizeof(ip_str));
-
-    printf("IP packet with ICMP content from: %s\n", ip_str);
-    struct ip*  ip_header = (struct ip*) buffer;
-    ssize_t     ip_header_len = 4 * ip_header->ip_hl;
-
-    printf ("IP header: "); 
-    print_as_bytes (buffer, ip_header_len);
-    printf("\n");
-
-    printf ("IP data:   ");
-    print_as_bytes (buffer + ip_header_len, packet_len - ip_header_len);
-    printf("\n\n");
-}
-
-struct sockaddr_in get_sockaddr_from_ip(char *ip) {
-    struct sockaddr_in sock;
-    bzero(&sock, sizeof(sock));
-    sock.sin_family = AF_INET;
-    if (!inet_pton(AF_INET, ip, &sock.sin_addr)) {
-        fprintf(stderr, "Given ip is invalid: %s\n", ip);
-        exit(EXIT_FAILURE);
-    }
-    return sock;
-}
-
-int create_raw_icmp_socket() {
-    int sockfd = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
-    if (sockfd < 0) {
-        fprintf(stderr, "socket error: %s\n", strerror(errno));
-        exit(EXIT_FAILURE);
-    }
-    return sockfd;
-}
-
-uint16_t compute_icmp_checksum(const void *buff, int length)
-{
-	uint32_t sum;
-	const uint16_t* ptr = buff;
-	assert (length % 2 == 0);
-	for (sum = 0; length > 0; length -= 2)
-		sum += *ptr++;
-	sum = (sum >> 16) + (sum & 0xffff);
-	return (uint16_t)(~(sum + (sum >> 16)));
-}
-
-struct icmp create_icmp_header(uint16_t seq) {    
-    struct icmp header;
-    header.icmp_type = ICMP_ECHO;
-    header.icmp_code = 0;
-    header.icmp_id = (uint16_t)getpid();
-    header.icmp_seq = seq;
-    header.icmp_cksum = 0;
-    header.icmp_cksum = compute_icmp_checksum(
-        (uint16_t*)&header, sizeof(header));
-
-    return header;
-}
-
-void send_icmp_packet(int sockfd, struct sockaddr_in *destination, int ttl) {
-    struct icmp header = create_icmp_header(ttl);
-    setsockopt(sockfd, IPPROTO_IP, IP_TTL, &ttl, sizeof(int));
-
-    ssize_t bytes_sent = sendto(
-        sockfd,
-        &header,
-        sizeof(header),
-        0,
-        (struct sockaddr*)destination,
-        sizeof(*destination)
-    );
-    if (bytes_sent == -1) {
-        fprintf(stderr, "Error while sending ICMP packet: %s\n", strerror(errno));
-        exit(EXIT_FAILURE);
-    }
-}
-
-/* Return ip address of the sender of recceived package */
-ssize_t recv_packet(int sockfd, struct sockaddr_in *sender, uint8_t *buffer) {
-    socklen_t sender_len = sizeof(*sender);
-    ssize_t packet_len = recvfrom(sockfd, buffer, IP_MAXPACKET, 0,
-        (struct sockaddr*)sender, &sender_len);
-    
-    if (packet_len == -1) {
-        fprintf(stderr, "Error while recieving a packet: %s\n", strerror(errno));
-        exit(EXIT_FAILURE);
-    }
-    return packet_len;
-}
-
-void send_icmp_requests(int sockfd, struct sockaddr_in *destination, int ttl, int tries) {
-    for (int i = 0; i < tries; i++) {
-        send_icmp_packet(sockfd, destination, ttl);
-    }
-}
-
-int try_select(int sockfd, struct timeval *tv) {
-    fd_set descriptors;
-    FD_ZERO(&descriptors);
-    FD_SET(sockfd, &descriptors);
-    return select(sockfd+1, &descriptors, NULL, NULL, tv);
-}
-
-void pretty_print_router(int ttl, struct in_addr *senders, float mean_wait_time, int messages_received) {
-    char ip_str[20];
-    printf("%d.\t", ttl);
-    if (messages_received == 0) {
-        printf("*\n");
-    }
-    else {
-        for (int i = 0; i < messages_received; i++) {
-            bool already_printed = false;
-            for (int j = 0; j < i; j++) {
-                if (senders[i].s_addr == senders[j].s_addr) {
-                    already_printed = true;
-                    break;
-                }
-            }
-            if (already_printed) continue;
-            inet_ntop(AF_INET, senders + i, ip_str, sizeof(ip_str));
-            printf("%-15s ", ip_str);
-        }
-        if (messages_received < MESSAGES_PER_TTL)   printf("\t???\n");
-        else                                        printf("\t%.2fms\n", mean_wait_time);
-    }
-}
-
-// This function decapsulates important data from the IMCP replies
-void get_important_data(uint8_t *buffer, uint8_t *code, uint16_t *id, uint16_t *seq) {
-    struct ip*      ip_header = (struct ip*) buffer;
-    ssize_t         offset = 4 * ip_header->ip_hl;
-    *code = ((struct icmp *)(buffer + offset))->icmp_type;
-    if (*code != ICMP_ECHOREPLY && *code != ICMP_TIMXCEED) {
-        return;
-    } else if (*code == ICMP_TIMXCEED) {
-        offset  += ICMP_MINLEN;
-        offset  += 4 * ((struct ip *)(buffer + offset))->ip_hl;
-        *seq    = ((struct icmp *)(buffer + offset))->icmp_seq;
-        *id     = ((struct icmp *)(buffer + offset))->icmp_id;
-    } else {
-        *seq = ((struct icmp *)(buffer + offset))->icmp_seq;
-        *id = ((struct icmp *)(buffer + offset))->icmp_id;
-    }
-}
-
-// timeout in milliseconds
-float get_replies(int sockfd, long timeout, int ttl, int *messages_received, struct in_addr *senders) {
-    struct sockaddr_in  sender;
-    uint8_t             buffer[IP_MAXPACKET];
-    int                 ready;
-    long                mean_wait_time = 0;
-    struct timeval      tv; tv.tv_sec = timeout / 1000; tv.tv_usec = 0;
-    *messages_received = 0;
-
-    while ((ready = try_select(sockfd, &tv))) {
-        if (ready < 0) {
-            fprintf(stderr, "Select error: %s\n", strerror(errno));
-            exit(EXIT_FAILURE);
-        }
-
-        recv_packet(sockfd, &sender, buffer);
-        uint8_t         icmp_code = 0;
-        uint16_t        seq = 0, id = 0;
-
-        get_important_data(buffer, &icmp_code, &id, &seq);
-        if (seq == ttl) {
-            senders[(*messages_received)++] = sender.sin_addr;
-            mean_wait_time += timeout * 1000 - tv.tv_usec;
-            
-            if (*messages_received == MESSAGES_PER_TTL) break;
-        }
-    }
-    // changing from microseconds to miliseconds
-    return (float)mean_wait_time / 3.0 / 1000.0;
-}
-
-// Core of the program.
-void traceroute(struct sockaddr_in *destination) {
-    int sockfd = create_raw_icmp_socket(), messages_received = 0;
-    struct in_addr senders[MESSAGES_PER_TTL];
-
-    for (int ttl = 1; ttl <= MAX_TTL; ++ttl) {
-        send_icmp_requests(sockfd, destination, ttl, MESSAGES_PER_TTL);
-        float mean_wait_time = get_replies(sockfd, 1000, ttl, &messages_received, senders);
-        pretty_print_router(ttl, senders, mean_wait_time, messages_received);
-
-        // what if our packet branched and we got to the destination faster by some path? 
-        // we gotta make a loop, not an if
-        for (int i = 0; i < messages_received; i++) {
-            if (senders[i].s_addr == destination->sin_addr.s_addr) {
-                return;
-            }
-        }
-    }
-}     
-
-int main(int argc, char * argv[]) {
-    if (argc < 2) {
-        fprintf(stderr, "Usage:\n\t%s [host ip]\n", argv[0]);
-        return 1;
-    }
-
-    struct sockaddr_in destination = get_sockaddr_from_ip(argv[1]);
-    fprintf(stdout, "traceroute to %s, %d hops max\n", argv[1], MAX_TTL);
-    traceroute(&destination);
-
-    return 0;
-}
\ No newline at end of file