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#include "junk/network.h"
#include <arpa/inet.h>
#include <errno.h>
#include <linux/if_ether.h>
#include <linux/if_packet.h>
#include <net/ethernet.h> /* the L2 protocols */
#include <netdb.h>
#include <netinet/in.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#define TAG "network"
int tcp_ipv4_send(char *ip, char *port, char *data) {
int sock;
struct addrinfo hints, *p, *res;
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
if (getaddrinfo(ip, port, &hints, &res) != 0) {
fprintf(stderr, "%s: getaddrinfo (%d): %s\n", TAG, errno,
gai_strerror(errno));
return errno;
}
if ((sock = socket(res->ai_family, res->ai_socktype, res->ai_protocol)) ==
-1) {
fprintf(stderr, "%s: socket (%d): %s\n", TAG, errno, strerror(errno));
return errno;
}
if (connect(sock, res->ai_addr, res->ai_addrlen) == -1) {
fprintf(stderr, "%s: connect (%d): %s\n", TAG, errno, strerror(errno));
return errno;
}
int len = strlen(data);
int bytes_sent = 0;
int total_bytes_sent = 0;
while (1) {
if ((bytes_sent = send(sock, data, len, 0)) == -1) {
fprintf(stderr, "%s: send (%d): %s\n", TAG, errno, strerror(errno));
return errno;
}
total_bytes_sent += bytes_sent;
if (bytes_sent == len) {
break;
}
}
close(sock);
freeaddrinfo(res);
return 0;
}
/* eth_bind
* Bind to a L2 Ethernet address.
*
*/
int eth_bind(char address[]) {
int sock;
struct sockaddr_ll addrinfo;
if ((sock = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ARP))) == -1) {
fprintf(stderr, "%s: socket (%d): %s\n", TAG, errno, strerror(errno));
return errno;
}
fprintf(stderr, "%s: socket fd: (%d)\n", TAG, sock);
memset(&addrinfo, 0, sizeof addrinfo);
addrinfo.sll_family = AF_PACKET;
addrinfo.sll_protocol = htons(ETH_P_ARP);
addrinfo.sll_ifindex = 0;
addrinfo.sll_pkttype = PACKET_BROADCAST;
sscanf((char *)address, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
&addrinfo.sll_addr[0], &addrinfo.sll_addr[1], &addrinfo.sll_addr[2],
&addrinfo.sll_addr[3], &addrinfo.sll_addr[4], &addrinfo.sll_addr[5]);
addrinfo.sll_halen = 6;
fprintf(stderr, "%s: target mac (%02x:%02x:%02x:%02x:%02x:%02x)\n", TAG,
addrinfo.sll_addr[0], addrinfo.sll_addr[1], addrinfo.sll_addr[2],
addrinfo.sll_addr[3], addrinfo.sll_addr[4], addrinfo.sll_addr[5]);
int status = 0;
if ((status = bind(sock, (struct sockaddr *)&addrinfo, sizeof(addrinfo))) !=
0) {
fprintf(stderr, "%s: bind (%d): %s\n", TAG, errno, strerror(errno));
return status;
}
return sock;
}
/* eth_recv
* Recv on a L2 Ethernet address.
*
*/
int eth_recv(int sockfd, arp_packet *packet) {
int buffer_len = 200;
char buffer[buffer_len];
memset(buffer, 0, buffer_len);
int bytes_read = 0;
int total_bytes_read = 0;
while (1) {
bytes_read = recv(sockfd, &buffer[total_bytes_read],
buffer_len - total_bytes_read, 0);
if (bytes_read == -1) {
fprintf(stderr, "%s: recv (%d): %s\n", TAG, errno, strerror(errno));
return -1;
} else if (bytes_read > 0) {
fprintf(stderr, "%s: recv: read %d bytes, total %d\n", TAG, bytes_read,
total_bytes_read);
total_bytes_read += bytes_read;
} else {
ethhdr *recv_struct = (ethhdr *)buffer;
fprintf(stderr, "%s: source mac (%02x:%02x:%02x:%02x:%02x:%02x)\n", TAG,
recv_struct->h_source[0], recv_struct->h_source[1],
recv_struct->h_source[2], recv_struct->h_source[3],
recv_struct->h_source[4], recv_struct->h_source[5]);
fprintf(stderr, "%s: dest mac (%02x:%02x:%02x:%02x:%02x:%02x)\n", TAG,
recv_struct->h_dest[0], recv_struct->h_dest[1],
recv_struct->h_dest[2], recv_struct->h_dest[3],
recv_struct->h_dest[4], recv_struct->h_dest[5]);
memcpy((char *)packet, (char *)(buffer + sizeof(ethhdr)),
sizeof(arp_packet));
return 0;
}
}
}
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