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b: new case, connect to client and receive->print his data

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This commit is contained in:
Krzosa Karol
2026-01-28 23:12:42 +01:00
parent eaa3eab826
commit 126e818e2c
5 changed files with 496 additions and 3 deletions
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2
build.bat
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@@ -2,5 +2,5 @@
mkdir build
cd build
cl ../src/main.cpp -Fe:server.exe -FC -WX -W3 -wd4200 -diagnostics:column -nologo -Zi -D_CRT_SECURE_NO_WARNINGS
cl ../src/b.cpp -Fe:server.exe -FC -WX -W3 -wd4200 -diagnostics:column -nologo -Zi -D_CRT_SECURE_NO_WARNINGS
cd ..

269
src/a.cpp Normal file
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@@ -0,0 +1,269 @@
/*
- [a] Create basic client code
- [a] Create threads and put client code, server code on separate
- [ ] Connect to client and listen for messages - print them
- [ ] Create a chat server where you can prepend "client 0 to client 2: {msg}": and it will forward and print that message there
- [ ] type 'quit' or 'exit' to kill the app
- [ ] Write an http server and send some stuff to the browser!
https://beej.us/guide/bgnet/html/
*/
#define WIN32_LEAN_AND_MEAN
#define WIN32_NO_MIN_MAX
#define NOMINMAX
#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdio.h>
#include <stdlib.h>
#pragma comment(lib, "ws2_32")
#include "basic.cpp"
Enum_Value _ai_flags_table[] = {
ENUM_VALUE(AI_PASSIVE),
ENUM_VALUE(AI_CANONNAME),
ENUM_VALUE(AI_NUMERICHOST),
};
Slice<Enum_Value> ai_flags_table = PLEN(_ai_flags_table);
Enum_Value _ai_family_table[] = {
{0, "AF_UNSPEC"},
{2, "AF_INET"},
{17, "AF_NETBIOS"},
{23, "AF_INET6"},
{26, "AF_IRDA"},
{32, "AF_BTH"},
};
Slice<Enum_Value> ai_family_table = PLEN(_ai_family_table);
Enum_Value _ai_socktype_table[] = {
ENUM_VALUE(SOCK_STREAM),
ENUM_VALUE(SOCK_DGRAM),
ENUM_VALUE(SOCK_RAW),
ENUM_VALUE(SOCK_RDM),
ENUM_VALUE(SOCK_SEQPACKET),
};
Slice<Enum_Value> ai_socktype_table = PLEN(_ai_socktype_table);
Enum_Value _ai_protocol_table[] = {
ENUM_VALUE(IPPROTO_TCP),
ENUM_VALUE(IPPROTO_UDP),
ENUM_VALUE(IPPROTO_PGM),
};
Slice<Enum_Value> ai_protocol_table = PLEN(_ai_protocol_table);
void serialize_addrinfo(struct addrinfo* in) {
for (struct addrinfo* p = in; p != NULL; p = p->ai_next) {
printf("addrinfo %p {\n", p);
printf(" ai_flags = %s(%d)\n", serialize_flags(ai_flags_table, p->ai_flags), p->ai_flags);
printf(" ai_family = %s(%d)\n", serialize(ai_family_table, p->ai_family), p->ai_family);
printf(" ai_socktype = %s(%d)\n", serialize(ai_socktype_table, p->ai_socktype), p->ai_socktype);
printf(" ai_protocol = %s(%d)\n", serialize(ai_protocol_table, p->ai_protocol), p->ai_protocol);
printf(" ai_addrlen = %zu\n", p->ai_addrlen);
printf(" ai_canonname = \"%s\"\n", p->ai_canonname ? p->ai_canonname : "");
const char* ipkind = "";
void* addr = NULL;
if (p->ai_family == AF_INET) {
sockaddr_in* ipv4 = (sockaddr_in*)p->ai_addr;
addr = &(ipv4->sin_addr);
ipkind = "IPv4";
}
else {
sockaddr_in6* ipv6 = (sockaddr_in6*)p->ai_addr;
addr = &(ipv6->sin6_addr);
ipkind = "IPv6";
}
char ipstr[INET6_ADDRSTRLEN];
inet_ntop(p->ai_family, addr, ipstr, sizeof ipstr);
printf(" ai_addr = %s(%s)\n", ipkind, ipstr);
printf("}\n");
}
}
#define PORT "8000"
void *get_in_addr(struct sockaddr *sa)
{
if (sa->sa_family == AF_INET) {
return &(((struct sockaddr_in*)sa)->sin_addr);
}
return &(((struct sockaddr_in6*)sa)->sin6_addr);
}
void run_server() {
struct addrinfo *servinfo = {};
struct addrinfo hints = {};
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM; // tcp
hints.ai_flags = AI_PASSIVE;
// hints.ai_protocol = IPROTO_TCP; // tcp
INT err = getaddrinfo(NULL, PORT, &hints, &servinfo);
if (err != 0) {
panicf("getaddrinfo failed, error code: %s\n", gai_strerrorA(err));
}
defer { freeaddrinfo(servinfo); };
SOCKET socket_fd = -1;
for (addrinfo *it = servinfo; it; it = it->ai_next) {
socket_fd = socket(it->ai_family, it->ai_socktype, it->ai_protocol);
if (socket_fd == -1) {
debugf("skipping socket call %s", serialize_windows_error(WSAGetLastError()));
continue;
}
int yes = 1;
if (setsockopt(socket_fd, SOL_SOCKET, SO_REUSEADDR, (char *)&yes, sizeof(int)) == -1) {
panicf("failed to setsockopt %s", serialize_windows_error(WSAGetLastError()));
}
if (bind(socket_fd, it->ai_addr, (int)it->ai_addrlen) == -1) {
panicf("bind failed %s", serialize_windows_error(WSAGetLastError()));
closesocket(socket_fd);
socket_fd = -1;
continue;
}
break;
}
if (socket_fd == -1) {
panicf("failed to bind");
}
int max_pending_connections = 10;
if (listen(socket_fd, max_pending_connections) == -1) {
panicf("listen failed %s", serialize_windows_error(WSAGetLastError()));
}
debugf("waiting for connections...");
sockaddr_storage their_addr = {};
while (1) {
int their_addrlen = sizeof(their_addr);
SOCKET conn_sock = accept(socket_fd, (sockaddr *)&their_addr, &their_addrlen);
if (conn_sock == -1) {
debugf("failed to accept connection %s", serialize_windows_error(WSAGetLastError()));
continue;
}
defer { closesocket(conn_sock); };
char s[INET6_ADDRSTRLEN];
sockaddr *n = (sockaddr *)&their_addr;
inet_ntop(their_addr.ss_family, get_in_addr((struct sockaddr *)&their_addr), s, sizeof(s));
debugf("server: got connection from: %s", s);
const char *msg = "Hello world";
int send_err_code = send(conn_sock, msg, (int)strlen(msg), 0);
if (send_err_code == -1) {
debugf("failed to send message %s", serialize_windows_error(WSAGetLastError()));
}
}
}
void run_client() {
struct addrinfo *servinfo = {};
struct addrinfo hints = {};
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM; // tcp
// hints.ai_flags = AI_PASSIVE;
// hints.ai_protocol = IPROTO_TCP; // tcp
INT err = getaddrinfo(NULL, PORT, &hints, &servinfo);
if (err != 0) {
panicf("client: getaddrinfo failed, error code: %s\n", gai_strerrorA(err));
}
defer { freeaddrinfo(servinfo); };
// serialize_addrinfo(servinfo);
SOCKET socket_fd = -1;
for (addrinfo *it = servinfo; it; it = it->ai_next) {
socket_fd = socket(it->ai_family, it->ai_socktype, it->ai_protocol);
if (socket_fd == -1) {
debugf("skipping socket call %s", serialize_windows_error(WSAGetLastError()));
continue;
}
char s[INET6_ADDRSTRLEN];
inet_ntop(it->ai_family, get_in_addr(it->ai_addr), s, sizeof(s));
debugf("client: attempting connection to: %s", s);
if (connect(socket_fd, it->ai_addr, (int)it->ai_addrlen) != 0) {
debugf("client: failed to connect %s", serialize_windows_error(WSAGetLastError()));
closesocket(socket_fd);
socket_fd = -1;
continue;
}
break;
}
if (socket_fd == -1) {
panicf("client: failed to connect");
} else {
debugf("client: connected!");
}
char buf[1024];
int numbytes = recv(socket_fd, buf, lengthof(buf) - 1, 0);
if (numbytes == -1) {
panicf("client: recv failed %s", serialize_windows_error(WSAGetLastError()));
}
buf[numbytes] = '\0';
debugf("client: received '%s'",buf);
closesocket(socket_fd);
}
struct Thread_Data {
int idx;
};
DWORD thread_entry(LPVOID param) {
Thread_Data *thread_data = (Thread_Data *)param;
printf("thread %d, reporting in!\n", thread_data->idx);
if (thread_data->idx == 0) {
run_server();
} else {
run_client();
}
printf("thread %d, exiting...\n", thread_data->idx);
return 0;
}
int main() {
WSADATA wsaData;
int err_wsa_startup = WSAStartup(MAKEWORD(2, 2), &wsaData);
if (err_wsa_startup != 0) {
panicf("WSAStartup failed, error code: %d", err_wsa_startup);
}
defer { WSACleanup(); };
if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) {
panicf("Version 2.2 of Winsock not available");
}
constexpr int thread_count = 8;
HANDLE thread_handles[32];
Thread_Data thread_data[32];
DWORD thread_ids[32];
static_assert(thread_count < lengthof(thread_ids));
for (int i = 0; i < thread_count; i += 1) {
thread_data[i].idx = i;
LPSECURITY_ATTRIBUTES attribs = NULL;
SIZE_T stack_size = 0;
DWORD creation_flags = 0;
thread_handles[i] = CreateThread(attribs, stack_size, thread_entry, &thread_data[i], creation_flags, &thread_ids[i]);
}
WaitForMultipleObjects(thread_count, thread_handles, TRUE, INFINITE);
// run_server();
debugf("exiting...");
return 0;
}

189
src/b.cpp Normal file
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@@ -0,0 +1,189 @@
#define WIN32_LEAN_AND_MEAN
#define WIN32_NO_MIN_MAX
#define NOMINMAX
#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdio.h>
#include <stdlib.h>
#pragma comment(lib, "ws2_32")
#include "basic.cpp"
#define SERVER_NAME NULL
#define SERVER_PORT "8000"
char *serialize(sockaddr *n) {
char s[INET6_ADDRSTRLEN];
void *addr = NULL;
if (n->sa_family == AF_INET) {
sockaddr_in* ipv4 = (sockaddr_in*)n;
addr = &(ipv4->sin_addr);
} else if (n->sa_family == AF_INET6) {
sockaddr_in6* ipv6 = (sockaddr_in6*)n;
addr = &(ipv6->sin6_addr);
} else {
return "<unhandled_case>";
}
const char *res = inet_ntop(n->sa_family, addr, s, sizeof(s));
assert(res != NULL);
return strf("%s", s);
}
int wrapped_close_socket(SOCKET socket) {
int err = closesocket(socket);
if (err == SOCKET_ERROR) {
panicf("server: failed to close socket: %s", wsa_error());
}
return -1;
}
void run_server() {
struct addrinfo *infos = {};
struct addrinfo hints = {};
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE;
int err = getaddrinfo(SERVER_NAME, SERVER_PORT, &hints, &infos);
if (err != 0) {
panicf("server: getaddrinfo failed, error code: %d", gai_strerrorA(err));
}
defer { freeaddrinfo(infos); };
SOCKET sock = -1;
for (addrinfo *it = infos; it; it = it->ai_next) {
sock = socket(it->ai_family, it->ai_socktype, it->ai_protocol);
if (sock == -1) {
debugf("server: skipping socket call: %s", wsa_error());
continue;
}
err = bind(sock, it->ai_addr, (int)it->ai_addrlen);
if (err != 0) {
debugf("server: bind failed: %s", wsa_error());
sock = wrapped_close_socket(sock);
continue;
}
debugf("server: bind to %s", serialize(it->ai_addr));
break;
}
if (sock == -1) {
panicf("server: failed to bind to a port!");
}
defer { wrapped_close_socket(sock); };
int max_pending_connections = 10;
err = listen(sock, max_pending_connections);
if (err != 0) { panicf("server: listen failed: %s", wsa_error()); }
sockaddr_storage client_sockaddr = {};
int sockaddr_len = sizeof(client_sockaddr);
SOCKET client_sock = accept(sock, (sockaddr *)&client_sockaddr, &sockaddr_len);
if (client_sock == -1) {
panicf("server: failed to accept connection %s", wsa_error());
}
defer { wrapped_close_socket(client_sock); };
for (;;) {
char buff[1024];
int bytes = recv(client_sock, buff, lengthof(buff) - 1, 0);
if (bytes == -1) {
panicf("server: failed recv %s", wsa_error());
}
debugf("server: %.*s", bytes, buff);
if (bytes == 4 && buff[0] == 'q' && buff[1] == 'u' && buff[2] == 'i' && buff[3] == 't') {
break;
}
}
debugf("server: exiting");
}
void run_client() {
struct addrinfo *infos = {};
struct addrinfo hints = {};
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
int err = getaddrinfo(SERVER_NAME, SERVER_PORT, &hints, &infos);
if (err != 0) {
panicf("client: getaddrinfo failed, error code: %d", gai_strerrorA(err));
}
defer { freeaddrinfo(infos); };
SOCKET sock = -1;
for (addrinfo *it = infos; it; it = it->ai_next) {
sock = socket(it->ai_family, it->ai_socktype, it->ai_protocol);
if (sock == -1) {
debugf("client: skipping socket call: %s", wsa_error());
continue;
}
err = connect(sock, it->ai_addr, (int)it->ai_addrlen);
if (err != 0) {
debugf("client: failed to connect %s", wsa_error());
sock = wrapped_close_socket(sock);
continue;
}
break;
}
if (sock == -1) {
panicf("client: failed to connect %s", wsa_error());
}
defer { wrapped_close_socket(sock); };
for (;;) {
const char *buff = "hello world!";
int buff_size = (int)strlen(buff);
int bytes = send(sock, buff, buff_size, 0);
// bytes can be less then buffer and that needs to be handled
// that is the remaining amount needs to be sent?
if (bytes == SOCKET_ERROR) {
debugf("client: failed to send %s", wsa_error());
}
}
}
struct Thread_Context {
int idx;
};
DWORD thread_entry(void *param) {
Thread_Context *ctx = (Thread_Context *)param;
if (ctx->idx == 0) {
run_server();
} else {
run_client();
}
return 0;
}
int main() {
WSADATA wsaData;
int err = WSAStartup(MAKEWORD(2, 2), &wsaData);
if (err != 0) {
panicf("WSAStartup failed: %s", serialize_windows_error(err));
}
defer { WSACleanup(); };
if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) {
panicf("Version 2.2 of Winsock not available");
}
constexpr int thread_count = 2;
HANDLE thread_handles[thread_count] = {};
DWORD thread_ids[thread_count] = {};
Thread_Context thread_datas[thread_count] = {};
for (int i = 0; i < thread_count; i += 1) {
Thread_Context *ctx = thread_datas + i;
ctx->idx = i;
LPSECURITY_ATTRIBUTES attribs = NULL;
thread_handles[i] = CreateThread(attribs, 0, thread_entry, thread_datas + i, 0, thread_ids + i);
}
WaitForMultipleObjects(thread_count, thread_handles, TRUE, INFINITE);
return 0;
}

36
src/basic.cpp
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@@ -1,3 +1,9 @@
#if _WIN32
#define OS_WINDOWS 1
#else
#define OS_WINDOWS 0
#endif
#define lengthof(x) (sizeof((x)) / sizeof((x)[0]))
#define panicf(...) (fprintf(stderr, "%s:%d: %s\n", __FILE__, __LINE__, strf(__VA_ARGS__)), exit(1))
@@ -68,3 +74,33 @@ char *serialize_flags(Slice<Enum_Value> table, int n) { // @leak
}
return result;
}
#if OS_WINDOWS
char *serialize_windows_error(DWORD errorCode) {
char* message = NULL;
size_t size = FormatMessageA(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
errorCode,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPSTR)&message,
0,
NULL
);
if (size > 0) {
char* newline = strchr(message, '\r');
if (newline) *newline = '\0';
}
return message; // @leak - LocalFree
}
char *wsa_error() {
return serialize_windows_error(WSAGetLastError());
}
#endif

1
src/main.cpp
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@@ -174,7 +174,6 @@ void run_server() {
}
defer { closesocket(conn_sock); };
// @todo: this might be a little wrong, also the win32 and unix seem to differ on field names in sockaddr
char s[INET6_ADDRSTRLEN];
sockaddr *n = (sockaddr *)&their_addr;
inet_ntop(their_addr.ss_family, get_in_addr((struct sockaddr *)&their_addr), s, sizeof(s));