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-rw-r--r--chatty.c393
1 files changed, 278 insertions, 115 deletions
diff --git a/chatty.c b/chatty.c
index 3b59001..4746aa7 100644
--- a/chatty.c
+++ b/chatty.c
@@ -2,6 +2,7 @@
#include "termbox2.h"
#include "chatty.h"
+#include "protocol.h"
#include <arpa/inet.h>
#include <assert.h>
@@ -14,19 +15,39 @@
// time to reconnect in seconds
#define TIMEOUT_RECONNECT 1
#define INPUT_LIMIT 512
-
-// must be of AUTHOR_LEN -1
-static u8 username[AUTHOR_LEN] = "(null)";
-// file descriptros for polling
-static struct pollfd* fds = NULL;
-// mutex for locking fds when in thread_reconnect()
-static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
-
-enum { FDS_SERVER = 0,
+// Filepath where user ID is stored
+#define ID_FILE "_id"
+// Import id from ID_FILE
+#define IMPORT_ID
+// Filepath where logged
+#define LOGFILE "chatty.log"
+// enable logging
+#define LOGGING
+
+enum { FDS_UNI = 0, // for one-way communication with the server (eg. TextMessage)
+ FDS_BI, // For two-way communication with the server (eg. IDMessage)
FDS_TTY,
FDS_RESIZE,
FDS_MAX };
+typedef struct {
+ u8 author[AUTHOR_LEN];
+ ID id;
+} Client;
+#define CLIENT_FMT "[%s](%lu)"
+#define CLIENT_ARG(client) client.author, client.id
+
+typedef struct {
+ s32 err; // Error while connecting
+ s32 unifd;
+ s32 bifd;
+} ConnectionResult;
+
+// Client used by chatty
+global_variable Client user = {0};
+// Address of chatty server
+global_variable struct sockaddr_in address;
+
// fill str array with char
void
fillstr(u32* str, u32 ch, u32 len)
@@ -44,39 +65,118 @@ popup(u32 fg, u32 bg, char* text)
tb_print(global.width / 2 - len / 2, global.height / 2, fg, bg, text);
}
+// Returns client in clientsArena matching id
+// Returns user if the id was the user's ID
+// Returns 0 if nothing was found
+Client*
+getClientById(Arena* clientsArena, ID id)
+{
+ if (id == user.id) return &user;
+
+ Client* clients = clientsArena->addr;
+ for (u64 i = 0; i < (clientsArena->pos / sizeof(*clients)); i++) {
+ if (clients[i].id == id)
+ return clients + i;
+ }
+ return 0;
+}
+
+// Request information of client from fd byd id and add it to clientsArena
+// Returns pointer to added client
+Client*
+addClientInfo(Arena* clientsArena, s32 fd, u64 id)
+{
+ // Request information about ID
+ HeaderMessage header = HEADER_INIT(HEADER_TYPE_ID);
+ IDMessage id_message = {.id = id};
+ sendAnyMessage(fd, &header, &id_message);
+
+ Client* client = ArenaPush(clientsArena, sizeof(*client));
+
+ // Wait for response
+ IntroductionMessage introduction_message;
+ recvAnyMessageType(fd, &header, &introduction_message, HEADER_TYPE_INTRODUCTION);
+
+ // Add the information
+ memcpy(client->author, introduction_message.author, AUTHOR_LEN);
+ client->id = id;
+
+ loggingf("Got " CLIENT_FMT "\n", CLIENT_ARG((*client)));
+ return client;
+}
+
+// Tries to connect to address and populates resulting file descriptors in ConnectionResult.
+ConnectionResult
+getConnection(struct sockaddr_in* address)
+{
+ ConnectionResult result;
+ result.unifd = socket(AF_INET, SOCK_STREAM, 0);
+ result.bifd = socket(AF_INET, SOCK_STREAM, 0);
+ result.err = connect(result.unifd, (struct sockaddr*)address, sizeof(*address));
+ if (result.err) return result; // We do not overwrite the error and return early so we can be
+ // certain of what error errno belongs to.
+ result.err = connect(result.bifd, (struct sockaddr*)address, sizeof(*address));
+ return result;
+}
+
// Connect to *address_ptr of type `struct sockaddr_in*`. If it failed wait for TIMEOUT_RECONNECT
// seconds.
// This function is meant to be run by a thread.
// An offline server means fds[FDS_SERVER] is set to -1. When online
// it is set to with the appropriate file descriptor.
-// Returns NULL.
+// Returns 0.
+#define Miliseconds(s) (s*1000*1000)
void*
-thread_reconnect(void* address_ptr)
+threadReconnect(void* fds_ptr)
{
- u32 serverfd, err;
- struct sockaddr_in* address = address_ptr;
-
+ struct pollfd* fds = fds_ptr;
+ ConnectionResult result;
+ struct timespec t = { 0, Miliseconds(300) }; // 300 miliseconds
+ loggingf("Trying to reconnect\n");
while (1) {
- serverfd = socket(AF_INET, SOCK_STREAM, 0);
- assert(serverfd > 2); // greater than STDERR
- err = connect(serverfd, (struct sockaddr*)address, sizeof(*address));
- if (err == 0)
- break;
- assert(errno == ECONNREFUSED);
- // TODO: faster reconnection? (too many open files)
- sleep(TIMEOUT_RECONNECT);
+ nanosleep(&t, &t);
+ result = getConnection(&address);
+ if (result.err) {
+ // loggingf("err: %d\n", result.err);
+ loggingf("errno: %d\n", errno);
+ } else if (result.unifd != -1 && result.bifd != -1) {
+ loggingf("Reconnect succeeded (%d, %d), authenticating\n", result.unifd, result.bifd);
+ // We assume that we already have an ID
+ // TODO: could there be a problem if a message is received at the same time?
+ // - not on server restart, but what if we lost connection?
+ HeaderMessage header = HEADER_INIT(HEADER_TYPE_ID);
+ IDMessage id_message = {.id = user.id};
+ sendAnyMessage(result.bifd, &header, &id_message);
+
+ ErrorMessage error_message;
+ s32 nrecv = recvAnyMessageType(result.bifd, &header, &error_message, HEADER_TYPE_ERROR);
+ if (nrecv == -1 || nrecv == 0) {
+ loggingf("Error on receive, retrying...\n");
+ continue;
+ }
+
+ assert(header.type == HEADER_TYPE_ERROR);
+ if (error_message.type == ERROR_TYPE_SUCCESS) {
+ loggingf("Reconnected\n");
+ break;
+ } else {
+ loggingf("err: %s\n", errorTypeString(error_message.type));
+ }
+ }
+ if (result.unifd != -1)
+ close(result.unifd);
+ if (result.bifd != -1)
+ close(result.bifd);
+ loggingf("Failed, retrying..\n");
}
- // if the server would send a disconnect again and the polling catches up there could be two
- // threads accessing fds.
- pthread_mutex_lock(&mutex);
- fds[FDS_SERVER].fd = serverfd;
- pthread_mutex_unlock(&mutex);
+ fds[FDS_BI].fd = result.bifd;
+ fds[FDS_UNI].fd = result.unifd;
- // ask to redraw screen
+ // Redraw screen
raise(SIGWINCH);
- return NULL;
+ return 0;
}
// Print `text` wrapped to limit_x. It will print no more than limit_y lines. x, y, fg and
@@ -85,9 +185,8 @@ thread_reconnect(void* address_ptr)
// this is useful when for example: printing messages and wanting to have consistent
// timestamp+author name.
// Returns the number of lines printed.
-// TODO: add y limit
-// TODO:(bug) text after pfx is wrapped one too soon
-// TODO: text == NULL to know how many lines *would* be printed
+// TODO: (bug) text after pfx is wrapped one too soon
+// TODO: text == 0 to know how many lines *would* be printed
// - no this should be a separate function
// TODO: check if text[i] goes out of bounds
u32
@@ -107,7 +206,7 @@ tb_printf_wrap(u32 x, u32 y, u32 fg, u32 bg, u32* text, s32 text_len, u32 fg_pfx
u32 failed = 0;
// NOTE: We can assume that we need to wrap, therefore print a newline after the prefix string
- if (pfx != NULL) {
+ if (pfx != 0) {
tb_printf(x, ly, fg_pfx, bg_pfx, "%s", pfx);
// If the text fits on one line print the text and return
@@ -174,7 +273,7 @@ tb_printf_wrap(u32 x, u32 y, u32 fg, u32 bg, u32* text, s32 text_len, u32 fg_pfx
// it displays a prompt with the user input of input_len wide characters
// and the received messages from msgsArena
void
-screen_home(Arena* msgsArena, u32 nmessages, u32 input[], u32 input_len)
+screen_home(Arena* msgsArena, u32 nmessages, Arena* clientsArena, struct pollfd* fds, u32 input[], u32 input_len)
{
// config options
const s32 box_max_len = 80;
@@ -205,7 +304,7 @@ screen_home(Arena* msgsArena, u32 nmessages, u32 input[], u32 input_len)
goto draw_prompt;
u8* addr = msgsArena->addr;
- assert(addr != NULL);
+ assert(addr != 0);
// on what line to print the current message, used for scrolling
u32 msg_y = 0;
@@ -238,46 +337,62 @@ screen_home(Arena* msgsArena, u32 nmessages, u32 input[], u32 input_len)
HeaderMessage* header = (HeaderMessage*)addr;
addr += sizeof(*header);
+ // Get Client for message
+ ID* id;
+ Client* client;
+ switch (header->type) {
+ case HEADER_TYPE_TEXT:
+ id = &((TextMessage*)addr)->id;
+ case HEADER_TYPE_PRESENCE:
+ id = &((PresenceMessage*)addr)->id;
+ client = getClientById(clientsArena, *id);
+ if (!client) {
+ loggingf("Client not known, requesting from server\n");
+ client = addClientInfo(clientsArena, fds[FDS_BI].fd, *id);
+ }
+ assert(client);
+ break;
+ }
+
switch (header->type) {
case HEADER_TYPE_TEXT: {
TextMessage* message = (TextMessage*)addr;
+ // Color own messages
u32 fg = 0;
- if (strncmp((char*)username, (char*)message->author, AUTHOR_LEN) == 0) {
+ if (user.id == message->id) {
fg = TB_CYAN;
} else {
fg = TB_MAGENTA;
}
- // prefix is of format "HH:MM:SS [<author>] ", so
+
+ // prefix is of format "HH:MM:SS [<author>] ", create it
u8 pfx[AUTHOR_LEN - 1 + TIMESTAMP_LEN - 1 + 4 + 1] = {0};
u8 timestamp[TIMESTAMP_LEN];
formatTimestamp(timestamp, message->timestamp);
- sprintf((char*)pfx, "%s [%s] ", timestamp, message->author);
- // TODO: y_limit
+ sprintf((char*)pfx, "%s [%s] ", timestamp, client->author);
+
msg_y += tb_printf_wrap(0, msg_y, TB_WHITE, 0, (u32*)&message->text, message->len, fg, 0, pfx, global.width, free_y - msg_y);
u32 message_size = TEXTMESSAGE_SIZE + message->len * sizeof(*message->text);
addr += message_size;
- break;
- }
+ } break;
case HEADER_TYPE_PRESENCE: {
PresenceMessage* message = (PresenceMessage*)addr;
- tb_printf(0, msg_y, 0, 0, " [%s] *%s*", message->author, presenceTypeString(message->type));
+ tb_printf(0, msg_y, 0, 0, " [%s] *%s*", client->author, presenceTypeString(message->type));
msg_y++;
addr += sizeof(*message);
- break;
- }
+ } break;
case HEADER_TYPE_HISTORY: {
HistoryMessage* message = (HistoryMessage*)addr;
addr += sizeof(*message);
// TODO: implement
- }
- default: {
+ } break;
+ default:
tb_printf(0, msg_y, 0, 0, "%s", headerTypeString(header->type));
msg_y++;
break;
}
- }
}
draw_prompt:
@@ -340,7 +455,7 @@ screen_home(Arena* msgsArena, u32 nmessages, u32 input[], u32 input_len)
}
}
- if (fds[FDS_SERVER].fd == -1) {
+ if (fds[FDS_UNI].fd == -1 || fds[FDS_BI].fd == -1) {
// show error popup
popup(TB_RED, TB_BLACK, "Server disconnected.");
}
@@ -350,77 +465,128 @@ screen_home(Arena* msgsArena, u32 nmessages, u32 input[], u32 input_len)
int
main(int argc, char** argv)
{
- // Use first argument as username
- if (argc > 1) {
- u32 arg_len = strlen(argv[1]);
- assert(arg_len <= AUTHOR_LEN - 1);
- memcpy(username, argv[1], arg_len);
- username[arg_len] = '\0';
+ if (argc < 2) {
+ fprintf(stderr, "usage: chatty <username>\n");
+ return 1;
}
+ u32 arg_len = strlen(argv[1]);
+ assert(arg_len <= AUTHOR_LEN - 1);
+ memcpy(user.author, argv[1], arg_len);
+ user.author[arg_len] = '\0';
+
s32 err = 0; // error code for functions
- Arena* msgsArena = ArenaAlloc(Megabytes(64)); // Messages received & sent
- u32 nmessages = 0; // Number of messages in msgsArena
- s32 nrecv = 0; // number of bytes received
- s32 nsend = 0; // number of bytes sent
+ u32 nmessages = 0; // Number of messages in msgsArena
+ s32 nrecv = 0; // number of bytes received
u32 input[INPUT_LIMIT] = {0}; // input buffer
u32 ninput = 0; // number of characters in input
+ Arena msgsArena;
+ Arena clientsArena;
+ ArenaAlloc(&msgsArena, Megabytes(64)); // Messages received & sent
+ ArenaAlloc(&clientsArena, Megabytes(1)); // Arena for storing clients
+
struct tb_event ev; // event fork keypress & resize
u8 quit = 0; // boolean to indicate if we want to quit the main loop
- u8* quitmsg = NULL; // this string will be printed before returning from main
+ u8* quitmsg = 0; // this string will be printed before returning from main
pthread_t thr_rec; // thread for reconnecting to server when disconnected
+#ifdef LOGGING
+ logfd = open(LOGFILE, O_RDWR | O_CREAT | O_TRUNC, 0600);
+ assert(logfd != -1);
+#else
+ logfd = 2; // stderr
+#endif
+
// poopoo C cannot infer type
- fds = (struct pollfd[FDS_MAX]){
- {-1, POLLIN, 0}, // FDS_SERVER
+ struct pollfd fds[FDS_MAX] = {
+ {-1, POLLIN, 0}, // FDS_UNI
+ {-1, POLLIN, 0}, // FDS_BI
{-1, POLLIN, 0}, // FDS_TTY
{-1, POLLIN, 0}, // FDS_RESIZE
};
- const struct sockaddr_in address = {
+ address = (struct sockaddr_in){
AF_INET,
htons(PORT),
{0},
{0},
};
- // Connecting to server
- {
- s32 serverfd;
- serverfd = socket(AF_INET, SOCK_STREAM, 0);
- assert(serverfd > 2); // greater than STDERR
-
- err = connect(serverfd, (struct sockaddr*)&address, sizeof(address));
- if (err != 0) {
- perror("Server");
+ ConnectionResult result = getConnection(&address);
+ if (result.err) {
+ perror("Server");
+ return 1;
+ }
+ assert(result.unifd != -1);
+ assert(result.bifd != -1);
+ assert(!result.err);
+ fds[FDS_BI].fd = result.bifd;
+ fds[FDS_UNI].fd = result.unifd;
+
+#ifdef IMPORT_ID
+ // File for storing the user's ID.
+ u32 idfile = open(ID_FILE, O_RDWR | O_CREAT, 0600);
+ s32 nread = read(idfile, &user.id, sizeof(user.id));
+ assert(nread != -1);
+ // see "Authentication" in chatty.h
+ if (nread == sizeof(user.id)) {
+ // Scenario 1: We know our id
+
+ // Send IDMessage and check if it is correct
+ HeaderMessage header = HEADER_INIT(HEADER_TYPE_ID);
+ IDMessage message = {.id = user.id};
+ sendAnyMessage(fds[FDS_BI].fd, &header, &message);
+
+ ErrorMessage error_message = {0};
+ recvAnyMessageType(fds[FDS_BI].fd, &header, &error_message, HEADER_TYPE_ERROR);
+
+ switch (error_message.type) {
+ case ERROR_TYPE_SUCCESS: break;
+ case ERROR_TYPE_NOTFOUND:
+ printf("Server does not know our ID. Consider removing '" ID_FILE "'\n");
+ return 1;
+ default:
+ printf("Server: %s\n", errorTypeString(error_message.type));
return 1;
}
- fds[FDS_SERVER].fd = serverfd;
-
- // Introduce ourselves
- HeaderMessage header = HEADER_PRESENCEMESSAGE;
- PresenceMessage message = {.type = PRESENCE_TYPE_CONNECTED};
- memcpy(message.author, username, AUTHOR_LEN);
- nsend = send(serverfd, &header, sizeof(header), 0);
- assert(nsend != -1);
- assert(nsend == sizeof(header));
- nsend = send(serverfd, &message, sizeof(message), 0);
- assert(nsend != -1);
- assert(nsend == sizeof(message));
+ } else {
+#else
+ if (1) {
+#endif
+ // Scenario 2: We do not have an ID
+ HeaderMessage header = HEADER_INIT(HEADER_TYPE_INTRODUCTION);
+ IntroductionMessage message = {0};
+ // copy user data into message
+ memcpy(message.author, user.author, AUTHOR_LEN);
+
+ // Send the introduction message
+ sendAnyMessage(fds[FDS_BI].fd, &header, &message);
+
+ IDMessage id_message = {0};
+ // Receive the response IDMessage
+ recvAnyMessageType(fds[FDS_BI].fd, &header, &id_message, HEADER_TYPE_ID);
+ assert(header.type == HEADER_TYPE_ID);
+ user.id = id_message.id;
+#ifdef IMPORT_ID
+ // Save permanently
+ write(idfile, &user.id, sizeof(user.id));
+ close(idfile);
+#endif
}
+ loggingf("Got ID: %lu\n", user.id);
// for wide character printing
- assert(setlocale(LC_ALL, "") != NULL);
+ assert(setlocale(LC_ALL, "") != 0);
// init
tb_init();
tb_get_fds(&fds[FDS_TTY].fd, &fds[FDS_RESIZE].fd);
- screen_home(msgsArena, nmessages, input, ninput);
+ screen_home(&msgsArena, nmessages, &clientsArena, fds, input, ninput);
tb_present();
// main loop
@@ -431,43 +597,45 @@ main(int argc, char** argv)
tb_clear();
- if (fds[FDS_SERVER].revents & POLLIN) {
+ if (fds[FDS_UNI].revents & POLLIN) {
// got data from server
HeaderMessage header;
- nrecv = recv(fds[FDS_SERVER].fd, &header, sizeof(header), 0);
+ nrecv = recv(fds[FDS_UNI].fd, &header, sizeof(header), 0);
assert(nrecv != -1);
// Server disconnects
if (nrecv == 0) {
// close diconnected server's socket
- err = close(fds[FDS_SERVER].fd);
+ err = close(fds[FDS_UNI].fd);
assert(err == 0);
- fds[FDS_SERVER].fd = -1; // ignore
+ fds[FDS_UNI].fd = -1; // ignore
// start trying to reconnect in a thread
- err = pthread_create(&thr_rec, NULL, &thread_reconnect, (void*)&address);
+ err = pthread_create(&thr_rec, 0, &threadReconnect, (void*)fds);
assert(err == 0);
} else {
- // TODO: validate version
- // if (header.version == PROTOCOL_VERSION)
- // continue;
+ if (header.version != PROTOCOL_VERSION) {
+ loggingf("Header received does not match version\n");
+ continue;
+ }
- void* addr = ArenaPush(msgsArena, sizeof(header));
+ void* addr = ArenaPush(&msgsArena, sizeof(header));
memcpy(addr, &header, sizeof(header));
+ // Messages handled from server
switch (header.type) {
case HEADER_TYPE_TEXT:
- recvTextMessage(msgsArena, fds[FDS_SERVER].fd, NULL);
+ recvTextMessage(&msgsArena, fds[FDS_UNI].fd);
nmessages++;
break;
case HEADER_TYPE_PRESENCE:;
- PresenceMessage* message = ArenaPush(msgsArena, sizeof(*message));
- nrecv = recv(fds[FDS_SERVER].fd, message, sizeof(*message), 0);
+ PresenceMessage* message = ArenaPush(&msgsArena, sizeof(*message));
+ nrecv = recv(fds[FDS_UNI].fd, message, sizeof(*message), 0);
assert(nrecv != -1);
assert(nrecv == sizeof(*message));
nmessages++;
break;
default:
- // TODO: log
+ loggingf("Got unhandled message: %s\n", headerTypeString(header.type));
break;
}
}
@@ -512,7 +680,7 @@ main(int argc, char** argv)
if (ninput == 0)
// do not send empty message
break;
- if (fds[FDS_SERVER].fd == -1)
+ if (fds[FDS_UNI].fd == -1)
// do not send message to disconnected server
break;
@@ -521,25 +689,21 @@ main(int argc, char** argv)
ninput++;
// Save header
- HeaderMessage header = HEADER_TEXTMESSAGE;
- void* addr = ArenaPush(msgsArena, sizeof(header));
+ HeaderMessage header = HEADER_INIT(HEADER_TYPE_TEXT);
+ void* addr = ArenaPush(&msgsArena, sizeof(header));
memcpy(addr, &header, sizeof(header));
// Save message
- TextMessage* sendmsg = ArenaPush(msgsArena, TEXTMESSAGE_SIZE);
- memcpy(sendmsg->author, username, AUTHOR_LEN);
- sendmsg->timestamp = time(NULL);
+ TextMessage* sendmsg = ArenaPush(&msgsArena, TEXTMESSAGE_SIZE);
+ sendmsg->id = user.id;
+ sendmsg->timestamp = time(0);
sendmsg->len = ninput;
u32 text_size = ninput * sizeof(*input);
- ArenaPush(msgsArena, text_size);
+ ArenaPush(&msgsArena, text_size);
memcpy(&sendmsg->text, input, text_size);
- // Send message
- nsend = send(fds[FDS_SERVER].fd, &header, sizeof(header), 0);
- assert(nsend != -1);
- nsend = send(fds[FDS_SERVER].fd, sendmsg, TEXTMESSAGE_SIZE + TEXTMESSAGE_TEXT_SIZE((*sendmsg)), 0);
- assert(nsend != -1);
+ sendAnyMessage(fds[FDS_UNI].fd, &header, sendmsg);
nmessages++;
// also clear input
@@ -550,7 +714,8 @@ main(int argc, char** argv)
default:
if (ev.ch == 0)
break;
- // TODO: logging
+
+ // TODO: show error
if (ninput == INPUT_LIMIT - 1) // last byte reserved for \0
break;
@@ -568,17 +733,15 @@ main(int argc, char** argv)
tb_poll_event(&ev);
}
- screen_home(msgsArena, nmessages, input, ninput);
+ screen_home(&msgsArena, nmessages, &clientsArena, fds, input, ninput);
tb_present();
}
tb_shutdown();
- if (quitmsg != NULL)
+ if (quitmsg != 0)
printf("%s\n", quitmsg);
- ArenaRelease(msgsArena);
-
return 0;
}
generated by cgit v1.2.3 (git 2.39.1) at 2025-05-03 15:52:52 +0000