src/irc_conn.c
author Tero Marttila <terom@fixme.fi>
Sun, 08 Mar 2009 17:17:37 +0200
changeset 23 542c73d07d3c
parent 22 c339c020fd33
child 24 08a26d0b9afd
permissions -rw-r--r--
add a simple irc_log module (with evsql code) that joins a channel and log_info's PRIVMSGs
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#include "irc_conn.h"
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#include "irc_cmd.h"
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#include "log.h"
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#include <stdlib.h>
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#include <string.h>
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/*
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 * "Welcome to the Internet Relay Network <nick>!<user>@<host>"
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 */
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static void on_RPL_WELCOME (struct irc_conn *conn, const struct irc_line *line, void *arg)
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{
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    // update state
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    conn->registered = true;
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    log_info("registered");
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}
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/*
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 * PING <server1> [ <server2> ]
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 *
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 * Send a 'PONG <server1>` reply right away.
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 */ 
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static void on_PING (struct irc_conn *conn, const struct irc_line *line, void *arg)
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{
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    // just reply
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    irc_conn_PONG(conn, line->args[0]);
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}
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/*
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 * Our command handlers
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 */
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struct irc_cmd_handler _cmd_handlers[] = {
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    { IRC_RPL_WELCOME,  on_RPL_WELCOME      },
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    { "PING",           on_PING             },
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    { NULL,             NULL,               },
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};
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/*
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 * Incoming line handler
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 */
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void irc_conn_on_line (char *line_buf, void *arg) 
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{
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    struct irc_conn *conn = arg;
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    struct irc_line line;
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    struct irc_cmd_chain *chain;
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    struct irc_cmd_handler *handler;
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    int err;
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    // log
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    log_debug("%s", line_buf);
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    // parse
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    if ((err = irc_line_parse(&line, line_buf))) {
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        log_warn("invalid line: %s: %s\n", line_buf, error_name(err));
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        return;
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    }
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    // run each handler chain
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    STAILQ_FOREACH(chain, &conn->handlers, node) {
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        // look up appropriate handler
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        for (handler = chain->handlers; handler->command; handler++) {
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            // the command is alpha-only, so normal case-insensitive cmp is fine
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            if (strcasecmp(handler->command, line.command) == 0) {
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                // invoke the func
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                handler->func(conn, &line, chain->arg);
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                // ...only one per chain
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                break;
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            }
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        }
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    }
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}
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err_t irc_conn_create (struct irc_conn **conn_ptr, struct sock_stream *sock, const struct irc_conn_config *config, struct error_info *err)
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{
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    struct irc_conn *conn;
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    // alloc new state struct
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    if ((conn = calloc(1, sizeof(struct irc_conn))) == NULL)
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        return SET_ERROR(err, ERR_CALLOC);
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    // initialize command handlers
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    STAILQ_INIT(&conn->handlers);
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    // add the core handlers 
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    if ((ERROR_CODE(err) = irc_conn_register_handler_chain(conn, _cmd_handlers, NULL)))
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        return ERROR_CODE(err);
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    // create the line_proto, with our on_line handler
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    if (line_proto_create(&conn->lp, sock, IRC_LINE_MAX * 1.5, &irc_conn_on_line, conn, err))
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        return ERROR_CODE(err);
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    // send the initial messages
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    if (
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            irc_conn_NICK(conn, config->nickname)
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        ||  irc_conn_USER(conn, config->username, config->realname)
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    )
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        return ERROR_CODE(err);
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    // ok
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    *conn_ptr = conn;
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    return SUCCESS;
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}
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err_t irc_conn_register_handler_chain (struct irc_conn *conn, struct irc_cmd_handler *handlers, void *arg)
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{
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    struct irc_cmd_chain *item;
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    // allocate the chain item
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    if ((item = calloc(1, sizeof(*item))) == NULL)
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        return ERR_CALLOC;
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    // store
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    item->handlers = handlers;
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    item->arg = arg;
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    // append
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    STAILQ_INSERT_TAIL(&conn->handlers, item, node);
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    // ok
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    return SUCCESS;
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}
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err_t irc_conn_send (struct irc_conn *conn, const struct irc_line *line)
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{
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    char line_buf[IRC_LINE_MAX + 2];
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    err_t err;
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    // format
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    if ((err = irc_line_build(line, line_buf)))
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        return err;
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    // log
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    log_debug("%s", line_buf);
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    // add CRLF
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    strcat(line_buf, "\r\n");
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    // send using line_proto
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    // XXX: ignore output-buffering
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    return (err = line_proto_send(conn->lp, line_buf)) < 0 ? err : SUCCESS;
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}
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err_t irc_conn_NICK (struct irc_conn *conn, const char *nickname)
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{
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    // NICK <nickname>
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    struct irc_line line = {
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        NULL, "NICK", { nickname, NULL }
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    };
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    return irc_conn_send(conn, &line);
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}
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err_t irc_conn_USER (struct irc_conn *conn, const char *username, const char *realname)
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{
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    // USER <user> <mode> <unused> <realname>
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    struct irc_line line = {
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        NULL, "USER", { username, "0", "*", realname, NULL }
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    };
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    return irc_conn_send(conn, &line);
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}
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err_t irc_conn_PONG (struct irc_conn *conn, const char *target)
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{
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    // PONG <server> [ <server2> ]
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    // XXX: params are actually the wrong way around now, but nobody cares
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    struct irc_line line = {
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        NULL, "PONG", { target, NULL }
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    };
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    return irc_conn_send(conn, &line);
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}
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err_t irc_conn_JOIN (struct irc_conn *conn, const char *channel)
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{
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    // JOIN ( <channel> *( "," <channel> ) [ <key> *( "," <key> ) ] ) / "0"
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    struct irc_line line = {
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        NULL, "JOIN", { channel, NULL }
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    };
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    return irc_conn_send(conn, &line);
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}
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   187