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git.gir.st - ircpipe.git/blob - ircpipe.c
1 #define _POSIX_C_SOURCE 200112L /* getopt(>=2), strtok_r(*), getaddrinfo(>=200112L), clock_gettime(>=199309L), sigaction(*) */
10 #include <sys/types.h>
11 #include <sys/socket.h>
16 #define DEFAULT_TLS NO_TLS
17 #define DEFAULT_PORT_TCP "6667"
18 #define DEFAULT_PORT_TLS "6697"
20 #define POLL_TIMEOUT 100 /*ms*/
21 #define PING_INTERVAL 120000 /*ms*/
22 #define PONG_TIMEOUT 2000 /*ms*/
25 #define STR(x) STR_(x)
26 #define OR_DIE < 0 && (perror(__FILE__ ":" STR(__LINE__)), exit(1), 0)
27 #define OR_DIE_gai(err) if (err) {fprintf(stderr, __FILE__ ":" STR(__LINE__) ": %s \n " , gai_strerror(err));exit(1);}
28 #define OR_DIE_tls(ctx) < 0 && (exit((fprintf(stderr, __FILE__ ":" STR(__LINE__) ": %s \n " , tls_error(ctx)), 1)), 0)
43 int fd
; /* always contains the underlying file descriptor */
44 struct tls
* tls
; /* tls context, or NULL with plain socket */
46 #define _IMPLFN(fn, sock, buf, sz) ( \
48 ? tls_ ## fn(sock.tls, buf, sz) \
49 : fn(sock.fd, buf, sz) \
51 #define READ(sock, buf, sz) _IMPLFN(read, sock, buf, sz)
52 #define WRITE(sock, buf, sz) _IMPLFN(write, sock, buf, sz)
54 void irc_help ( const char * exe
, const int code
) {
55 fprintf ( stderr
, "Usage: %s [-pP] [-sSk] [-n NICK] [-j CHAN] HOST [PORT] \n " , exe
);
59 sock_t
irc_connect ( const char * host
, const char * port
, const int tls
, const char * ca_file
) {
61 struct addrinfo
* results
, * r
;
62 struct timeval timeout
;
64 int err
= getaddrinfo ( host
, port
, NULL
, & results
); OR_DIE_gai ( err
); /*unable to resolve*/
69 for ( r
= results
; r
!= NULL
; r
= r
-> ai_next
) {
70 sock
. fd
= socket ( r
-> ai_family
, SOCK_STREAM
, 0 );
71 if ( sock
. fd
< 0 ) continue ;
73 setsockopt ( sock
. fd
, SOL_SOCKET
, SO_SNDTIMEO
, & timeout
, sizeof timeout
) OR_DIE
;
74 if ( connect ( sock
. fd
, r
-> ai_addr
, r
-> ai_addrlen
) == 0 )
75 break ; /* successfully connected */
77 close ( sock
. fd
); /* failed, try next addr */
81 /* all failed; abort. */
84 /* connection established. */
86 struct tls
* ctx
= tls_client ();
87 struct tls_config
* cfg
= tls_config_new ();
89 if ( tls
== INSECURE_TLS
) {
90 tls_config_insecure_noverifycert ( cfg
);
91 tls_config_insecure_noverifyname ( cfg
);
92 tls_config_insecure_noverifytime ( cfg
);
93 tls_config_set_ciphers ( cfg
, "legacy" ); /* even more: 'insecure' */
95 tls_config_set_dheparams ( cfg
, "auto" ) OR_DIE_tls ( ctx
);
96 if ( ca_file
) tls_config_set_ca_file ( cfg
, ca_file
) OR_DIE_tls ( ctx
);
97 /* todo: if ca_file ends in /, call tls_config_set_ca_path() instead */
99 tls_configure ( ctx
, cfg
) OR_DIE_tls ( ctx
);
100 tls_config_free ( cfg
);
101 tls_connect_socket ( ctx
, sock
. fd
, host
) OR_DIE_tls ( ctx
);
102 tls_handshake ( ctx
) OR_DIE_tls ( ctx
);
105 } else sock
. tls
= NULL
;
106 /* connect timeout here */
109 freeaddrinfo ( results
);
113 enum { /* requested command: */
120 int irc_answer ( const sock_t sock
, char * buf
, const unsigned int command
) {
121 unsigned int seen
= 0 ;
123 char * line
= strtok_r ( buf
, " \r\n " , & saveptr
);
124 /*TODO: it often happens that we take multiple calls to read() all the available lines (e.g. large motd, NAMES message). when this happens, one call to read() will return an incomplete line, and the next will start in the middle of a line. this can't be parsed properly! we need to check if the last line ends with a newline. that's hard because we use strtok which removes newlines. on the second read we should either skip over the first partial line or better, defer parsing the last line of the first read until we have the complete line.*/
126 /* skip over prefix (servername): */
128 while (* line
&& * line
++ != ' ' );
130 /* look for command responses or relevant error numerics: */
131 /* TODO: our current handling of only a specific set of error numerics makes us vulnerable to hangs, when an unexpected code was received. we should really respect a response timeout here (during setup this must be quite large, because of ident and port scanning!) */
133 case PING
: seen
|= PING
* ( strncmp ( line
, "PONG " , 5 )== 0 ); break ;
134 case JOIN
: seen
|= JOIN
* ( strncmp ( line
, "JOIN " , 5 )== 0 );
135 seen
|= ERRS
* ( strncmp ( line
, "403 " , 4 )== 0 );
136 seen
|= ERRS
* ( strncmp ( line
, "405 " , 4 )== 0 );
137 seen
|= ERRS
* ( strncmp ( line
, "471 " , 4 )== 0 );
138 seen
|= ERRS
* ( strncmp ( line
, "473 " , 4 )== 0 );
139 seen
|= ERRS
* ( strncmp ( line
, "474 " , 4 )== 0 );
140 seen
|= ERRS
* ( strncmp ( line
, "475 " , 4 )== 0 );
141 seen
|= ERRS
* ( strncmp ( line
, "476 " , 4 )== 0 );
142 seen
|= ERRS
* ( strncmp ( line
, "477 " , 4 )== 0 ); break ;
143 case NICK
: seen
|= NICK
* ( strncmp ( line
, "001 " , 4 )== 0 );
144 seen
|= ERRS
* ( strncmp ( line
, "432 " , 4 )== 0 );
145 seen
|= ERRS
* ( strncmp ( line
, "433 " , 4 )== 0 );
146 seen
|= ERRS
* ( strncmp ( line
, "436 " , 4 )== 0 );
147 seen
|= ERRS
* ( strncmp ( line
, "464 " , 4 )== 0 );
148 seen
|= ERRS
* ( strncmp ( line
, "902 " , 4 )== 0 );
149 seen
|= ERRS
* ( strncmp ( line
, "904 " , 4 )== 0 ); break ;
151 /* look for common error numerics if any command was given */
152 if ( command
& ( NICK
| JOIN
)) {
153 seen
|= ERRS
* ( strncmp ( line
, "400 " , 4 )== 0 );
154 seen
|= ERRS
* ( strncmp ( line
, "421 " , 4 )== 0 );
155 seen
|= ERRS
* ( strncmp ( line
, "465 " , 4 )== 0 );
157 /* always look for a fatal error */
158 if ( strncmp ( line
, "ERROR " , 6 )== 0 ) seen
|= ERRS
;
161 fprintf ( stderr
, "IRC error: %s \n " , line
);
165 /* reply to pings: */
166 if ( strncmp ( line
, "PING " , 5 ) == 0 ) {
167 int n
= strlen ( line
);
168 int crlf
= line
[ n
+ 1 ] == ' \n ' ; /* strtok only removes first delimeter */
169 line
[ 1 ] = 'O' ; /* PING :foo -> PONG :foo */
170 line
[ n
] = crlf
? ' \r ' : ' \n ' ; /* re-terminate after strtok */
171 WRITE ( sock
, line
, n
+ crlf
+ 1 );
173 } while (( line
= strtok_r ( NULL
, " \r\n " , & saveptr
)));
178 int irc_base64 ( char * buf
, int n
) {
179 const char * b
= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" ;
180 int i
, o
, v
, l
= (( n
+( 3 - n
% 3 )% 3 )/ 3 )* 4 ;
181 buf
[ n
+ 1 ] = buf
[ n
+ 2 ] = buf
[ l
] = '\0' ;
182 for ( i
=( n
+( 3 - n
% 3 )% 3 )- 3 , o
= l
- 4 ; i
>= 0 && o
>= 0 ; i
-= 3 , o
-= 4 ) {
183 v
= buf
[ i
+ 0 ]<< 16 | buf
[ i
+ 1 ]<< 8 | buf
[ i
+ 2 ]<< 0 ;
184 buf
[ o
+ 0 ] = b
[ v
>> 18 & 0x3f ];
185 buf
[ o
+ 1 ] = b
[ v
>> 12 & 0x3f ];
186 buf
[ o
+ 2 ] = ( i
+ 1 < n
)? b
[ v
>> 06 & 0x3f ]: '=' ;
187 buf
[ o
+ 3 ] = ( i
+ 2 < n
)? b
[ v
>> 00 & 0x3f ]: '=' ;
192 int irc_wait ( const sock_t sock
, const int outfd
, int cmd
, char * buf
) {
194 struct pollfd fds
[ 1 ];
196 fds
[ 0 ]. events
= POLLIN
;
198 for (;;) { /* note: reusing callee's buf */
199 if ( poll ( fds
, 1 , POLL_TIMEOUT
)) {
200 n
= READ ( sock
, buf
, BUFSIZ
); buf
[ n
] = '\0' ;
201 if ( n
== 0 ) return - 1 ; /* server closed connection */
202 write ( outfd
, buf
, n
);
203 n
= irc_answer ( sock
, buf
, cmd
);
204 if ( n
& cmd
) return 0 ;
205 else if ( n
& ERRS
) return - 1 ;
210 int irc_setup ( const sock_t sock
, const int outfd
, const char * nick
, const char * pass
, int pass_type
, const char * chan
) {
214 if ( pass_type
== SASL_PLAIN_PASSWD
) {
215 n
= snprintf ( buf
, BUFSIZ
, "CAP REQ :sasl \r\n " );
217 } else if ( pass_type
== SERVER_PASSWD
) {
218 n
= snprintf ( buf
, BUFSIZ
, "PASS %s \r\n " , pass
);
222 n
= snprintf ( buf
, BUFSIZ
, "NICK %s \r\n " , nick
);
224 n
= snprintf ( buf
, BUFSIZ
, "USER %s 0 * :%s \r\n " , nick
, nick
);
227 if ( pass_type
== SASL_PLAIN_PASSWD
) {
228 /* note: should assert strlen(pass) < 300 for spec compliance */
229 /* should wait for 'CAP <nick|*> ACK :<...>' */
230 WRITE ( sock
, "AUTHENTICATE PLAIN \r\n " , 20 );
231 /* server sends 'AUTHENTICATE +' */
232 n
= snprintf ( buf
, BUFSIZ
, "AUTHENTICATE %s%c%s%c%s" , nick
, 0 , nick
, 0 , pass
);
233 n
= irc_base64 ( buf
+ 13 , n
- 13 )+ 13 ; /*13==strlen("AUTHENTICATE ")*/
234 n
+= snprintf ( buf
+ n
, BUFSIZ
- n
, " \r\n " );
236 /* wait for response 900+903 (ok) or 902/904 (err) */
237 WRITE ( sock
, "CAP END \r\n " , 9 );
241 n
= snprintf ( buf
, BUFSIZ
, "JOIN %s \r\n " , chan
);
243 /* block until we get a JOIN response or an error: */
244 n
= irc_wait ( sock
, outfd
, JOIN
, buf
);
246 /* block until we get a RPL_WELCOME or an error: */
247 n
= irc_wait ( sock
, outfd
, NICK
, buf
);
255 clock_gettime ( CLOCK_MONOTONIC
, & t
) OR_DIE
;
256 return t
. tv_sec
* 1000 + t
. tv_nsec
/ 1000000 ; /* milliseconds */
259 int irc_poll ( const sock_t sock
, const int infd
, const int outfd
) {
264 long recv_ts
= irc_time ();
267 struct pollfd fds
[ 2 ];
268 fds
[ IRC
]. fd
= sock
. fd
;
269 fds
[ IRC
]. events
= POLLIN
;
271 fds
[ CLI
]. events
= POLLIN
;
274 poll ( fds
, 2 , POLL_TIMEOUT
) OR_DIE
;
276 /* todo: should retry on EINTR, EAGAIN */
277 if ( fds
[ IRC
]. revents
& POLLIN
) {
278 n
= READ ( sock
, buf
, BUFSIZ
); buf
[ n
] = '\0' ;
279 if ( n
== 0 ) return - 1 ; /* server closed connection */
280 fds
[ IRC
]. events
= POLLIN
| ( n
== TLS_WANT_POLLOUT
? POLLOUT
: 0 );
281 write ( outfd
, buf
, n
);
282 if ( irc_answer ( sock
, buf
, want_pong
? PING
: NO_CMD
) & PING
)
284 recv_ts
= irc_time ();
286 if ( fds
[ CLI
]. revents
& POLLIN
) {
287 n
= read ( infd
, buf
, BUFSIZ
); buf
[ n
] = '\0' ;
288 if ( n
== 0 ) return 0 ; /* we closed connection */
289 n
= WRITE ( sock
, buf
, n
);
290 fds
[ IRC
]. events
= POLLIN
| ( n
== TLS_WANT_POLLOUT
? POLLOUT
: 0 );
292 if ( fds
[ IRC
]. revents
& POLLOUT
) { /* needed for TLS only */
293 n
= WRITE ( sock
, buf
, n
);
294 fds
[ IRC
]. events
= POLLIN
| ( n
== TLS_WANT_POLLOUT
? POLLOUT
: 0 );
297 if ( want_pong
&& irc_time () - recv_ts
> PING_INTERVAL
+ PONG_TIMEOUT
) {
298 /* pong timeout reached, abort. */
299 fprintf ( stderr
, "PONG timeout \n " );
301 } else if (! want_pong
&& irc_time () - recv_ts
> PING_INTERVAL
) {
302 /* haven't rx'd anything in a while, sending ping. */
303 WRITE ( sock
, "PING :ircpipe \r\n " , 15 );
309 void irc_cleanup ( const sock_t sock
) {
310 WRITE ( sock
, "QUIT :ircpipe \r\n " , 15 );
315 shutdown ( sock
. fd
, SHUT_RDWR
);
321 void irc_sighandler ( int signum
) {
331 int main ( int argc
, char ** argv
) {
337 int tls
= DEFAULT_TLS
;
338 char * ca_file
= NULL
;
339 int pass_type
= NO_PASSWD
;
342 struct sigaction act
;
346 pass
= getenv ( "IRC_PASSWD" );
347 ca_file
= getenv ( "IRC_CAFILE" );
349 while (( opt
= getopt ( argc
, argv
, "n:j:pPsSkh" )) != - 1 ) {
351 case 'n' : nick
= optarg
; break ;
352 case 'p' : pass_type
= SERVER_PASSWD
; break ;
353 case 'P' : pass_type
= SASL_PLAIN_PASSWD
; break ;
354 case 's' : tls
= USE_TLS
; break ;
355 case 'S' : tls
= NO_TLS
; break ;
356 case 'k' : tls
= INSECURE_TLS
; break ;
357 case 'j' : chan
= optarg
; break ;
358 default : irc_help ( argv
[ 0 ], opt
!= 'h' );
363 host
= argv
[ optind
++];
365 /* too few positional arguments */
366 fprintf ( stderr
, "missing HOST \n " );
367 irc_help ( argv
[ 0 ], 1 );
370 port
= argv
[ optind
++];
372 port
= ( tls
== NO_TLS
)
377 /* too many positional arguments */
378 fprintf ( stderr
, "too many args \n " );
379 irc_help ( argv
[ 0 ], 1 );
382 if ( pass_type
!= NO_PASSWD
&& pass
== NULL
) {
383 fprintf ( stderr
, "must set IRC_PASSWD envvar to use -p/-P \n " );
387 memset (& act
, 0 , sizeof act
);
388 act
. sa_handler
= irc_sighandler
;
389 sigaction ( SIGHUP
, & act
, NULL
);
390 sigaction ( SIGINT
, & act
, NULL
);
391 sigaction ( SIGTERM
, & act
, NULL
);
393 sock
= irc_connect ( host
, port
, tls
, ca_file
); sock
. fd OR_DIE
;
394 irc_setup ( sock
, 1 , nick
, pass
, pass_type
, chan
);
395 rv
= irc_poll ( sock
, 0 , 1 );