Commit | Line | Data |
---|---|---|
cf9b1199 SD |
1 | #include <stdio.h> |
2 | #include <assert.h> | |
3 | #include <linux/bpf.h> | |
4 | #include <unistd.h> | |
5 | #include "libbpf.h" | |
6 | #include "bpf_load.h" | |
7 | #include <sys/socket.h> | |
8 | #include <string.h> | |
9 | #include <netinet/in.h> | |
10 | #include <arpa/inet.h> | |
11 | ||
12 | int main(int ac, char **argv) | |
13 | { | |
14 | int serverfd, serverconnfd, clientfd; | |
15 | socklen_t sockaddr_len; | |
16 | struct sockaddr serv_addr, mapped_addr, tmp_addr; | |
17 | struct sockaddr_in *serv_addr_in, *mapped_addr_in, *tmp_addr_in; | |
18 | char filename[256]; | |
19 | char *ip; | |
20 | ||
21 | serv_addr_in = (struct sockaddr_in *)&serv_addr; | |
22 | mapped_addr_in = (struct sockaddr_in *)&mapped_addr; | |
23 | tmp_addr_in = (struct sockaddr_in *)&tmp_addr; | |
24 | ||
25 | snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); | |
26 | ||
27 | if (load_bpf_file(filename)) { | |
28 | printf("%s", bpf_log_buf); | |
29 | return 1; | |
30 | } | |
31 | ||
32 | assert((serverfd = socket(AF_INET, SOCK_STREAM, 0)) > 0); | |
33 | assert((clientfd = socket(AF_INET, SOCK_STREAM, 0)) > 0); | |
34 | ||
35 | /* Bind server to ephemeral port on lo */ | |
36 | memset(&serv_addr, 0, sizeof(serv_addr)); | |
37 | serv_addr_in->sin_family = AF_INET; | |
38 | serv_addr_in->sin_port = 0; | |
39 | serv_addr_in->sin_addr.s_addr = htonl(INADDR_LOOPBACK); | |
40 | ||
41 | assert(bind(serverfd, &serv_addr, sizeof(serv_addr)) == 0); | |
42 | ||
43 | sockaddr_len = sizeof(serv_addr); | |
44 | assert(getsockname(serverfd, &serv_addr, &sockaddr_len) == 0); | |
45 | ip = inet_ntoa(serv_addr_in->sin_addr); | |
46 | printf("Server bound to: %s:%d\n", ip, ntohs(serv_addr_in->sin_port)); | |
47 | ||
48 | memset(&mapped_addr, 0, sizeof(mapped_addr)); | |
49 | mapped_addr_in->sin_family = AF_INET; | |
50 | mapped_addr_in->sin_port = htons(5555); | |
51 | mapped_addr_in->sin_addr.s_addr = inet_addr("255.255.255.255"); | |
52 | ||
53 | assert(!bpf_update_elem(map_fd[0], &mapped_addr, &serv_addr, BPF_ANY)); | |
54 | ||
55 | assert(listen(serverfd, 5) == 0); | |
56 | ||
57 | ip = inet_ntoa(mapped_addr_in->sin_addr); | |
58 | printf("Client connecting to: %s:%d\n", | |
59 | ip, ntohs(mapped_addr_in->sin_port)); | |
60 | assert(connect(clientfd, &mapped_addr, sizeof(mapped_addr)) == 0); | |
61 | ||
62 | sockaddr_len = sizeof(tmp_addr); | |
63 | ip = inet_ntoa(tmp_addr_in->sin_addr); | |
64 | assert((serverconnfd = accept(serverfd, &tmp_addr, &sockaddr_len)) > 0); | |
65 | printf("Server received connection from: %s:%d\n", | |
66 | ip, ntohs(tmp_addr_in->sin_port)); | |
67 | ||
68 | sockaddr_len = sizeof(tmp_addr); | |
69 | assert(getpeername(clientfd, &tmp_addr, &sockaddr_len) == 0); | |
70 | ip = inet_ntoa(tmp_addr_in->sin_addr); | |
71 | printf("Client's peer address: %s:%d\n", | |
72 | ip, ntohs(tmp_addr_in->sin_port)); | |
73 | ||
74 | /* Is the server's getsockname = the socket getpeername */ | |
75 | assert(memcmp(&serv_addr, &tmp_addr, sizeof(struct sockaddr_in)) == 0); | |
76 | ||
77 | return 0; | |
78 | } |