int main(int argc, char const* argv[])
{
if (argc<2) perr("usage: chat_server [port]");
struct addrinfo *plist =
get_addrinfo_list("localhost",argv[1],SOCK_STREAM);
int fd = try_bind(plist);
if (fd==-1) perr("Cannot bind socket to port");
freeaddrinfo(plist);
if (listen(fd,BACKLOG)==-1) {
perror("listen");
exit(1);
}
struct sigaction sa;
sa.sa_handler = sigchld_handler;
sa.sa_flags = SA_RESTART;
sigemptyset(&sa.sa_mask);
if (sigaction(SIGCHLD,&sa,NULL)==-1) {
perror("sigaction");
exit(1);
}
while(1) {
struct sockaddr_storage addr;
socklen_t addr_len;
int client_fd = accept(fd,(struct sockaddr *)&addr,&addr_len);
if (fd==-1) {
perror("accept");
exit(1);
}
fprintf(stderr,"Got connection from\n");
print_sockaddr((struct sockaddr*)&addr);
fprintf(stderr,"\n");
int pid=fork();
if (pid<0) {
perror("fork");
exit(1);
} else if (pid==0) {
// child
close(fd);
const char welcome[] = "Welcome!";
//write(client_fd,welcome,sizeof(welcome));
struct client_mgr_t args={client_fd,60.0};
server_recvmgr(&args);
close(client_fd);
exit(0);
}
// parent
close(client_fd);
}
return 0;
}
int main(int argc, char *argv[])
{
/* FreeBSD has set limits for user login name -- MAXLOGNAME, but
* Linux doesn't have that limitation apparently. */
char *username = NULL;
if (argc != 2) {
tst_resm(TINFO, "Defaulting to user nobody");
username = strdup(nobody_uid);
} else {
/* Get test user uid/gid. */
username = argv[1];
}
if ((pw = getpwnam(username)) == NULL) {
tst_brkm(TBROK, 0, "Username - %s - not found", username);
tst_exit();
}
if ((gr = getgrgid(pw->pw_gid)) == NULL) {
tst_brkm(TBROK | TERRNO, 0, "getgrgid(%u) failed", pw->pw_gid);
tst_exit();
}
uid = pw->pw_uid;
gid = gr->gr_gid;
tst_resm(TINFO, "Socket will try to be bind by user: %s, group: %s",
pw->pw_name, gr->gr_name);
try_bind();
tst_exit();
tst_exit();
}
static int inet_listen_saddr(InetSocketAddress *saddr,
int port_offset,
Error **errp)
{
struct addrinfo ai,*res,*e;
char port[33];
char uaddr[INET6_ADDRSTRLEN+1];
char uport[33];
int rc, port_min, port_max, p;
int slisten = -1;
int saved_errno = 0;
bool socket_created = false;
Error *err = NULL;
memset(&ai,0, sizeof(ai));
ai.ai_flags = AI_PASSIVE;
if (saddr->has_numeric && saddr->numeric) {
ai.ai_flags |= AI_NUMERICHOST | AI_NUMERICSERV;
}
ai.ai_family = inet_ai_family_from_address(saddr, &err);
ai.ai_socktype = SOCK_STREAM;
if (err) {
error_propagate(errp, err);
return -1;
}
if (saddr->host == NULL) {
error_setg(errp, "host not specified");
return -1;
}
if (saddr->port != NULL) {
pstrcpy(port, sizeof(port), saddr->port);
} else {
port[0] = '\0';
}
/* lookup */
if (port_offset) {
unsigned long long baseport;
if (strlen(port) == 0) {
error_setg(errp, "port not specified");
return -1;
}
if (parse_uint_full(port, &baseport, 10) < 0) {
error_setg(errp, "can't convert to a number: %s", port);
return -1;
}
if (baseport > 65535 ||
baseport + port_offset > 65535) {
error_setg(errp, "port %s out of range", port);
return -1;
}
snprintf(port, sizeof(port), "%d", (int)baseport + port_offset);
}
rc = getaddrinfo(strlen(saddr->host) ? saddr->host : NULL,
strlen(port) ? port : NULL, &ai, &res);
if (rc != 0) {
error_setg(errp, "address resolution failed for %s:%s: %s",
saddr->host, port, gai_strerror(rc));
return -1;
}
/* create socket + bind/listen */
for (e = res; e != NULL; e = e->ai_next) {
getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen,
uaddr,INET6_ADDRSTRLEN,uport,32,
NI_NUMERICHOST | NI_NUMERICSERV);
port_min = inet_getport(e);
port_max = saddr->has_to ? saddr->to + port_offset : port_min;
for (p = port_min; p <= port_max; p++) {
inet_setport(e, p);
slisten = create_fast_reuse_socket(e);
if (slisten < 0) {
/* First time we expect we might fail to create the socket
* eg if 'e' has AF_INET6 but ipv6 kmod is not loaded.
* Later iterations should always succeed if first iteration
* worked though, so treat that as fatal.
*/
if (p == port_min) {
continue;
} else {
error_setg_errno(errp, errno,
"Failed to recreate failed listening socket");
goto listen_failed;
}
}
socket_created = true;
rc = try_bind(slisten, saddr, e);
if (rc < 0) {
if (errno != EADDRINUSE) {
error_setg_errno(errp, errno, "Failed to bind socket");
goto listen_failed;
}
} else {
if (!listen(slisten, 1)) {
goto listen_ok;
}
if (errno != EADDRINUSE) {
error_setg_errno(errp, errno, "Failed to listen on socket");
goto listen_failed;
}
}
/* Someone else managed to bind to the same port and beat us
* to listen on it! Socket semantics does not allow us to
* recover from this situation, so we need to recreate the
* socket to allow bind attempts for subsequent ports:
*/
closesocket(slisten);
slisten = -1;
}
}
error_setg_errno(errp, errno,
socket_created ?
"Failed to find an available port" :
"Failed to create a socket");
listen_failed:
saved_errno = errno;
if (slisten >= 0) {
closesocket(slisten);
}
freeaddrinfo(res);
errno = saved_errno;
return -1;
listen_ok:
freeaddrinfo(res);
return slisten;
}
int main()
{
sockaddr_storage_t proxy = {0};
sockaddr_storage_t target = {0};
sockaddr_storage_t msgname;
struct sctp_event_subscribe subscribe;
int pf_class = PF_INET;
int sk = 0 ;
uint32_t ppid;
uint32_t stream;
static char *message = "Hello world\n";
size_t buflen = 0;
char *big_buffer = NULL;
socklen_t msgname_len;
struct sctp_sndrcvinfo sinfo;
int offset, msg_flags;
int error = 0;
int result = 0;
// v6 也用不着
// 源地址配置
proxy.v4.sin_family = AF_INET;
proxy.v4.sin_port = htons(OUTBOUND_LOCAL_PORT);
proxy.v4.sin_addr.s_addr = SCTP_IP_LOOPBACK;
/*inet_pton(AF_INET, "1.2.3.4",
&proxy.v4.sin_addr.s_addr);*/
// 目标地址配置
target.v4.sin_family = AF_INET;
target.v4.sin_port = htons(OUTBOUND_REMOTE_PORT);
target.v4.sin_addr.s_addr = SCTP_IP_LOOPBACK;
/*inet_pton(AF_INET, "1.2.3.4",
&target.v4.sin_addr.s_addr);*/
sk = create_socket(pf_class, SOCK_SEQPACKET, IPPROTO_SCTP);
if (sk == -1)
{
return -1;
}
memset(&subscribe, 0, sizeof(subscribe));
subscribe.sctp_data_io_event = 1;
subscribe.sctp_association_event = 1;
subscribe.sctp_send_failure_event = 1;
set_sock_opt(sk, SCTP_EVENTS, &subscribe, sizeof(subscribe));
/* Bind these sockets to the test ports. */
try_bind(sk, &proxy.sa, sizeof(proxy));
buflen = REALLY_BIG;
big_buffer = try_malloc(buflen);
while (1)
{
ppid = rand();
stream = 1;
// 发送给目标机
send_to_target(sk, message, strlen(message) + 1,
(struct sockaddr *)&target, sizeof(target),
ppid, 0, stream, 0, 0);
// 然后接收目标机
//buflen = REALLY_BIG;
//big_buffer = try_malloc(buflen);
msgname_len = sizeof(msgname);
msg_flags = 0;
while (1)
{
memset(big_buffer, 0, buflen);
error = recv_from_target(sk, big_buffer, buflen,
(struct sockaddr *)&msgname, &msgname_len,
&sinfo, &msg_flags);
printf("\nbigbuffer(%d): %s \n", error, big_buffer);
hexdump(big_buffer, error);
// 如果是 data 类型，接收并回传
result = check_buf_notification(big_buffer, error, msg_flags,
sizeof(struct sctp_assoc_change),
SCTP_ASSOC_CHANGE, SCTP_COMM_UP);
if (result)
{
break;
}
}
sleep(2);
}
/*
// 问题来了，我是想要数据，而不是要 notify 这些东西
// 第一次接收到的是 notification
check_buf_notification(big_buffer, error, msg_flags,
sizeof(struct sctp_assoc_change),
SCTP_ASSOC_CHANGE, SCTP_COMM_UP);
// 第二次接收到的是 data
error = recv_from_target(sk, big_buffer, buflen,
(struct sockaddr *)&msgname, &msgname_len,
&sinfo, &msg_flags);
printf("\nbigbuffer(%d): %s \n", error, big_buffer);
hexdump(big_buffer, error);
check_buf_notification(big_buffer, error, msg_flags,
sizeof(struct sctp_assoc_change),
SCTP_ASSOC_CHANGE, SCTP_COMM_UP);*/
/*
error = recv_from_target(sk, big_buffer, buflen,
(struct sockaddr *)&msgname, &msgname_len,
&sinfo, &msg_flags);
printf("\nbigbuffer(%d): %s \n", error, big_buffer);
hexdump(big_buffer, error);
error = recv_from_target(sk, big_buffer, buflen,
(struct sockaddr *)&msgname, &msgname_len,
&sinfo, &msg_flags);
printf("\nbigbuffer(%d): %s \n", error, big_buffer);
hexdump(big_buffer, error);*/
return 0;
}