Is there a connection limitation using LWIP？ - sockets

Question

I'm writing a TCP server using Lwip Protocol, normally the server can connect to multiple TCP clients. However I have a problem , the server can't connect more than three active connections. The 4th or more clients could not connect for unknown reasons. I looked around the forums and tried increasing the number limit for MEMP_NUM_TCP_PCB in opt.h (lwip-x86_64\include\lwip\opt.h) but it didn't help.
Following is my code, and my questions is whether is there a max connection limitation using LWIP ? Maximum number of connections is 3 or more?
//server code
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define MYPORT 1234 // the port users will be connecting to
#define BACKLOG 2// how many pending connections queue will hold
#define BUF_SIZE 1024
int fd_A[BACKLOG]; // accepted connection fd
int conn_amount; // current connection amount
void showclient()
{
int i;
printf("-----> client amount: %d\n", conn_amount);
for (i = 0; i < BACKLOG; i++) {
printf("BACKLOG%d ---> fd = %d\n", i, fd_A[i]);
}
printf("\n\n");
}
int main(void)
{
sleep(1);
printf("start server\n");
int sock_fd, new_fd; // listen on sock_fd, new connection on new_fd
struct sockaddr_in server_addr; // server address information
struct sockaddr_in client_addr; // connector's address information
socklen_t sin_size;
int yes = 1;
char buf[BUF_SIZE];
int ret;
int i;
if ((sock_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
perror("socket");
exit(1);
}
//if (setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == -1) {
/*if (setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == -1) {
//perror("setsockopt");
//exit(1);
}
if (fcntl(sock_fd, F_SETFL, O_NONBLOCK) == -1) {
printf("Set server socket nonblock failed\n");
exit(1);
}*/
memset(&server_addr, 0, sizeof(server_addr));
server_addr.sin_family = AF_INET; // host byte order
server_addr.sin_port = htons(MYPORT); // short, network byte order
server_addr.sin_addr.s_addr = htonl(INADDR_ANY); // automatically fill with my IP
//memset(server_addr.sin_zero, '0', sizeof(server_addr.sin_zero));
if (bind(sock_fd, (struct sockaddr *)&server_addr, sizeof(server_addr)) == -1) {
perror("bind");
exit(1);
}
printf("listen...\n");
if (listen(sock_fd, BACKLOG) == -1) {
perror("listen");
exit(1);
}
printf("listen port %d\n", MYPORT);
fd_set fdsr, wfds, efds;
int maxsock;
struct timeval tv;
conn_amount = 0;
sin_size = sizeof(client_addr);
maxsock = sock_fd;
while (1)
{
sleep(1); // it's necessary
// initialize file descriptor set
FD_ZERO(&fdsr);
FD_ZERO(&wfds);
//FD_ZERO(&efds);
FD_SET(sock_fd, &fdsr); // add fd
FD_SET(sock_fd, &wfds); // add fd
//FD_SET(sock_fd, &efds); // add fd
// timeout setting
tv.tv_sec = 30;
tv.tv_usec = 0;
// add active connection to fd set
for (i = 0; i < BACKLOG; i++) {
if (fd_A[i] != 0) {
FD_SET(fd_A[i], &fdsr);
}
}
//printf("before select!!!!!!!!!!!! ret = %d\n", ret);
if ((select(maxsock + 1, &fdsr, &wfds, (fd_set*) 0, (struct timeval*) 0)) < 0) {
perror("select");
break;
}
// check every fd in the set
for (i = 0; i < conn_amount; i++)
{
if (FD_ISSET(fd_A[i], &fdsr)) // check which fd is ready
{
ret = recv(fd_A[i], buf, sizeof(buf), 0);
if (ret <= 0)
{ // client close
printf("ret : %d and client[%d] close\n", ret, i);
close(fd_A[i]);
FD_CLR(fd_A[i], &fdsr); // delete fd
fd_A[i] = 0;
conn_amount--;
}
else
{ // receive data
if (ret < BUF_SIZE)
memset(&buf[ret], '\0', 1); // add NULL('/0')
printf("client[%d] send:%s\n", i, buf);
}
}
}
// check whether a new connection comes
if (FD_ISSET(sock_fd, &fdsr)) // accept new connection
{
new_fd = accept(sock_fd, (struct sockaddr *)&client_addr, &sin_size);
if (new_fd <= 0)
{
perror("accept");
continue;
}
// add to fd queue
if (conn_amount < BACKLOG)
{
fd_A[conn_amount++] = new_fd;
printf("------> new connection client[%d] %s:%d\n", conn_amount,
inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));
if (new_fd > maxsock) // update the maxsock fd for select function
maxsock = new_fd;
}
else
{
printf("max connections arrive, exit\n");
send(new_fd, "bye", 4, 0);
close(new_fd);
break;
}
}
//showclient();
}
// close other connections
for (i = 0; i < BACKLOG; i++)
{
if (fd_A[i] != 0)
{
close(fd_A[i]);
}
}
exit(0);
}
//client code
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <malloc.h>
#include <netdb.h>
#include <fcntl.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#define RES_LENGTH 10240
int connect_socket(char * server,int serverPort);
int send_msg(int sockfd,char * sendBuff);
char * recv_msg(int sockfd);
int close_socket(int sockfd);
int main(int argc, char ** argv)
{
int sockfd[1024] = {0};
char sendMsg[30]="zhangchengfei\r\n\r";
char* res;
int port = 1234;
char ip[128] = {0};
strncpy(ip, "10.107.19.62", 128);
if(argc > 2)
{
strncpy(ip, argv[1], 128);
port = atoi(argv[2]);
printf("Input IP: %s, port : %d\n", ip, port);
}
else if(argc > 1)
{
//port = atoi(argv[1]);
//printf("Input port : %d\n", port);
//
int num_client = atoi(argv[1]);
int i = 0;
for (i = 0; i <= num_client; i++) {
printf("start connect %d\n", i + 1);
sockfd[i]=connect_socket(ip, port);
printf("connect %d OK\n", i + 1);
getchar();
}
for (i = 0; i <= num_client; i++) {
send_msg(sockfd[i], sendMsg);
/* res=recv_msg(sockfd); */
printf("client %d send msg = %s\n", i + 1, sendMsg);
//printf(res);
//free(res);
getchar();
}
for (i = 0; i <= num_client; i++) {
close_socket(sockfd[i]);
printf("close socket %d\n", i + 1);
}
}
return 0;
}
int connect_socket(char * server,int serverPort){
int sockfd=0;
struct sockaddr_in addr;
struct hostent * phost;
if((sockfd=socket(AF_INET,SOCK_STREAM,0))<0){
herror("Init socket error!");
return -1;
}
bzero(&addr,sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(serverPort);
addr.sin_addr.s_addr = inet_addr(server);
if(addr.sin_addr.s_addr == INADDR_NONE){
phost = (struct hostent*)gethostbyname(server);
if(phost==NULL){
herror("Init socket s_addr error!");
return -1;
}
addr.sin_addr.s_addr =((struct in_addr*)phost->h_addr)->s_addr;
}
if(connect(sockfd,(struct sockaddr*)&addr, sizeof(addr))<0)
{
perror("Connect server fail!");
return -1;
}
else
return sockfd;
}
int send_msg(int sockfd,char * sendBuff)
{
int sendSize=0;
if((sendSize=send(sockfd,sendBuff,strlen(sendBuff),0))<=0){
herror("Send msg error!");
return -1;
}else
return sendSize;
}
char* recv_msg(int sockfd){
char * response;
int flag=0,recLenth=0;
response=(char *)malloc(RES_LENGTH);
memset(response,0,RES_LENGTH);
for(flag=0;;)
{
printf("======recv data:\n");
if(( recLenth=recv(sockfd,response+flag,RES_LENGTH-flag,0))==-1 )
{
free(response);
printf("Return value : %d\n", recLenth);
perror("Recv msg error : ");
return NULL;
}
else if(recLenth==0)
break;
else
{
printf("%d char recieved data : %s.\n", recLenth, response+flag);
flag+=recLenth;
recLenth=0;
}
}
printf("Return value : %d\n", recLenth);
response[flag]='0';
return response;
}
int close_socket(int sockfd)
{
close(sockfd);
return 0;
}

Answer 1

I have solved this problem caused by a Makefile bug in ./stubdom, after executing make crossclean , I found the .o files still existed in lwip-x86_64 folder. So I add a command find . -name "*.o" | xargs rm -f in Makefile and then anything is OK.
The reason is that lwip configure is given by the macro definition, macro definition have been replaced at the pre-compilation stage, so if I modify the lwip configure and did not delete the .o files, there is no effect. Following is the macro definitions I have modified in opt.h.
MEMP_NUM_TCP_PCB 100
MEMP_NUM_TCP_PCB_LISTEN 100
MEMP_NUM_NETCONN 100
Now the server can break through the connection limitations and more than 3 active TCP connections can be established.