add reuse
[tedtools.git] / tcp.c
1 /*
2  * Copyright (c) 2004 Teodor Sigaev <teodor@sigaev.ru>
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *        notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *        notice, this list of conditions and the following disclaimer in the
12  *        documentation and/or other materials provided with the distribution.
13  * 3. Neither the name of the author nor the names of any co-contributors
14  *        may be used to endorse or promote products derived from this software
15  *        without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY CONTRIBUTORS ``AS IS'' AND ANY EXPRESS
18  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED. IN NO EVENT SHALL CONTRIBUTORS BE LIABLE FOR ANY
21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
23  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
25  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
26  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
27  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28  */
29 #include <stdio.h>
30 #include <errno.h>
31 #include <stdlib.h>
32 #include <string.h>
33 #include <unistd.h>
34 #include <fcntl.h>
35
36 #ifdef HAVE_POLL_H
37 #include <poll.h>
38 #else /* HAVE_POLL */
39 #ifdef HAVE_SYS_POLL_H
40 #include <sys/poll.h>
41 #else
42 #error Not defined HAVE_POLL_H or HAVE_SYS_POLL_H
43 #endif /* HAVE_SYS_POLL_H */
44 #endif /* HAVE_POLL */
45
46 #ifdef HAVE_HSTRERROR 
47 #include <netdb.h>
48 #endif
49
50
51 #include "connection.h"
52 #include "tlog.h"
53 #include "tmalloc.h"
54
55 static u_int32_t
56 setlinger( TC_Connection *cs ) {
57         struct linger ling;
58         int     val = 0;
59         socklen_t size = sizeof(val); 
60
61         if (getsockopt(cs->fd, SOL_SOCKET,SO_ERROR,&val,&size) == -1) {
62                 tlog(TL_ALARM,"getsockopt: %s:%d - %s(%d)",inet_ntoa(cs->serv_addr.sin_addr),
63                         ntohs(cs->serv_addr.sin_port), strerror(errno), errno);
64                 shutdown(cs->fd,SHUT_RDWR);
65                 close(cs->fd);
66                 cs->fd = 0;
67                 cs->state = CS_ERROR;
68                 return CS_ERROR;
69         }
70
71         if ( val ) {
72                 tlog(TL_ALARM,"getsockopt return: %s:%d - %s(%d)",inet_ntoa(cs->serv_addr.sin_addr),
73                         ntohs(cs->serv_addr.sin_port), strerror(val), val);
74                 shutdown(cs->fd,SHUT_RDWR);
75                 close(cs->fd);
76                 cs->fd = 0;
77                 cs->state = CS_ERROR;
78                 return CS_ERROR;
79         }
80
81
82         ling.l_onoff = ling.l_linger = 0;
83         if (setsockopt(cs->fd, SOL_SOCKET,SO_LINGER,(char *)&ling,sizeof(ling))==-1) {
84                 tlog(TL_ALARM,"setsockopt: LINGER %s:%d - %s",inet_ntoa(cs->serv_addr.sin_addr), ntohs(cs->serv_addr.sin_port),
85                         strerror(errno));
86                 shutdown(cs->fd,SHUT_RDWR);
87                 close(cs->fd);
88                 cs->fd = 0;
89                 cs->state = CS_ERROR;
90                 return CS_ERROR;
91         }
92         cs->state = CS_CONNECTED;
93         return CS_CONNECTED;
94 }
95
96 u_int32_t
97 TC_ClientInitConnection(TC_Connection *cs, char *name, u_int32_t port) {
98         int flags, val=1;
99
100         cs = TC_fillConnection(cs, name, port);
101
102         cs->state = CS_OK;
103         if ((cs->fd= socket(AF_INET, SOCK_STREAM, 0)) < 0)
104                 tlog(TL_CRIT|TL_EXIT,"socket4: %s:%d - %s",inet_ntoa(cs->serv_addr.sin_addr),
105                         ntohs(cs->serv_addr.sin_port),strerror(errno));
106
107         if (setsockopt(cs->fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)) < 0) {
108                 tlog(TL_CRIT|TL_EXIT, "socketsockopt failed: %s", strerror(errno));
109                 return CS_ERROR;
110         }
111
112         if ((flags=fcntl(cs->fd,F_GETFL,0)) == -1)
113                 tlog(TL_ALARM,"fcntl F_GETFL - %s",strerror(errno));
114         if (fcntl(cs->fd,F_SETFL,flags|O_NDELAY) < 0 )
115                 tlog(TL_ALARM,"fcntl O_NDELAY - %s",strerror(errno));
116
117         if (bind(cs->fd, (struct sockaddr *) &(cs->serv_addr), sizeof(cs->serv_addr)) < 0)
118                 tlog(TL_CRIT|TL_EXIT, "cannot bind to %s address: %s",
119                         inet_ntoa(cs->serv_addr.sin_addr), strerror(errno));
120         
121         if (listen(cs->fd, 0) < 0)
122                 tlog(TL_CRIT|TL_EXIT, "cannot listen to %s address: %s",
123                         inet_ntoa(cs->serv_addr.sin_addr), strerror(errno));
124         
125         return CS_OK;
126 }
127
128 TC_Connection*
129 TC_AcceptTcp(TC_Connection *cs) {
130         TC_Connection *nc;
131         struct sockaddr_in cli_addr;
132         int ret, flags;
133         socklen_t clilen = sizeof(cli_addr);
134
135         cs->state = CS_READ;
136         if ( (ret = accept(cs->fd,(struct sockaddr *)&cli_addr, &clilen)) < 0 ) {
137                 if ( errno == EAGAIN || errno == EWOULDBLOCK )
138                         return NULL;
139                 tlog(TL_ALARM,"TC_AcceptTcp: accept: %s", strerror(errno));
140                 return NULL;
141         }
142         nc = (TC_Connection*)t0malloc(sizeof(TC_Connection));
143
144         nc->fd = ret;
145         if ((flags=fcntl(nc->fd,F_GETFL,0)) == -1)
146                 tlog(TL_ALARM,"fcntl F_GETFL - %s",strerror(errno));
147         if (fcntl(nc->fd,F_SETFL,flags|O_NDELAY) < 0 )
148                 tlog(TL_ALARM,"fcntl O_NDELAY - %s",strerror(errno));
149         memcpy( &(nc->serv_addr), &cli_addr, clilen );
150         nc->state = CS_CONNECTED;
151
152         setlinger(nc);
153         return nc;
154 }
155
156 TC_Connection *
157 TC_fillConnection(TC_Connection *sc, char *name, u_int32_t port) {
158         if ( !sc ) 
159                 sc = (TC_Connection *)t0malloc(sizeof(TC_Connection));
160         sc->serv_addr.sin_family = AF_INET;
161         sc->serv_addr.sin_addr.s_addr = (name) ? inet_addr(name) : htonl(INADDR_ANY);
162         sc->serv_addr.sin_port = htons(port);
163         sc->state = CS_NOTINITED;
164         return sc; 
165 }
166
167
168 u_int32_t
169 TC_ServerInitConnect( TC_Connection     *cs ) {
170         int flags;
171
172         if ( cs->state == CS_ERROR )
173                 return CS_ERROR;
174
175         if ((cs->fd= socket(AF_INET, SOCK_STREAM, 0)) < 0) {
176                 tlog(TL_CRIT,"socket4: %s:%d - %s",inet_ntoa(cs->serv_addr.sin_addr),
177                         ntohs(cs->serv_addr.sin_port),strerror(errno));
178                 cs->state  = CS_ERROR;
179                 return  CS_ERROR;
180         }
181
182         if ((flags=fcntl(cs->fd,F_GETFL,0)) == -1)
183                 tlog(TL_ALARM,"fcntl F_GETFL - %s",strerror(errno));
184         if (fcntl(cs->fd,F_SETFL,flags|O_NDELAY) < 0 )
185                 tlog(TL_ALARM,"fcntl O_NDELAY - %s",strerror(errno));
186
187         if ( connect(cs->fd, (struct sockaddr *) &(cs->serv_addr),
188                 sizeof(struct sockaddr_in)) < 0 ) {
189                 if ( errno == EINPROGRESS || errno == EALREADY ) {
190                         cs->state = CS_INPROCESS;
191                         return CS_INPROCESS; 
192                 } else if (errno != EISCONN && errno != EALREADY &&
193                         errno != EWOULDBLOCK && errno != EAGAIN) {
194                         tlog(TL_DEBUG,"open4: %s:%d - %s",
195                                 inet_ntoa(cs->serv_addr.sin_addr), ntohs(cs->serv_addr.sin_port),
196                                 strerror(errno));
197                         shutdown(cs->fd,SHUT_RDWR);
198                         close(cs->fd);
199                         cs->fd = 0;
200                 } else {
201                         tlog(TL_DEBUG,"nonblock connect: %s:%d - %s [%d]",
202                                 inet_ntoa(cs->serv_addr.sin_addr),
203                                 ntohs(cs->serv_addr.sin_port),
204                                 strerror(errno),errno);
205                 }
206                 cs->state = CS_ERROR;
207                 return CS_ERROR;
208         }
209
210         cs->state = CS_INPROCESS;
211         return TC_ServerConnect( cs );
212 }
213         
214
215 u_int32_t
216 TC_ServerConnect( TC_Connection *cs ) {
217         struct pollfd   pfd;
218         int ret;
219
220         if ( cs->state != CS_INPROCESS )
221                 return cs->state;
222
223         pfd.fd = cs->fd;
224         pfd.events = POLLOUT;
225         pfd.revents = 0;
226         ret = poll( &pfd, 1, 0 );
227         if ( ret<0 ) {
228                 tlog( TL_CRIT, "TC_ServerConnect: poll: %s",
229                         strerror(errno));
230                 cs->state = CS_ERROR;
231                 return CS_ERROR;
232         } else if ( ret == 0 ) 
233                 return CS_INPROCESS;
234
235         if ( (pfd.revents & (POLLHUP | POLLNVAL | POLLERR)) ) {
236                 tlog( TL_CRIT, "TC_ServerConnect: poll return connect error for %s:%d",
237                         inet_ntoa(cs->serv_addr.sin_addr), ntohs(cs->serv_addr.sin_port));
238                 cs->state = CS_ERROR;
239                 return CS_ERROR;
240         }
241
242         if ( ! (pfd.revents & POLLOUT) )
243                 return CS_INPROCESS;
244
245
246         return setlinger( cs );
247 }
248
249 int
250 TC_ReadyIO( TC_Connection **cs, int number, int timeout ) {
251         struct pollfd   *pfd;
252         int ret,i, fdnum=0;
253
254         if ( number==0 || cs ==NULL ) {
255                 usleep( timeout * 1000.0 );
256                 return 0;
257         }
258         pfd = (struct pollfd*) tmalloc( sizeof(struct pollfd) * number );
259
260         for(i=0; i<number;i++) {
261                 if ( cs[i]->fd>0 && (cs[i]->state == CS_READ || cs[i]->state == CS_SEND) ) {
262                         pfd[fdnum].fd = cs[i]->fd;
263                         pfd[fdnum].events = ( cs[i]->state == CS_READ ) ? POLLIN : POLLOUT;
264                         pfd[fdnum].revents = 0;
265                         fdnum++;
266                 }
267                 cs[i]->readyio=0;
268         }
269         ret = poll( pfd, fdnum, timeout );
270         if ( ret<0 ) {
271                 tlog( TL_CRIT, "TC_ReadyIO: poll: %s",
272                         strerror(errno));
273                 tfree(pfd);
274                 return 0;
275         }
276
277         if ( ret == 0 ) {
278                 tfree(pfd);
279                 return 0;
280         }
281
282         fdnum=0; ret=0;
283         for(i=0; i<number;i++) {
284                 if ( cs[i]->fd>0 && (cs[i]->state == CS_READ || cs[i]->state == CS_SEND) ) {
285                         if ( pfd[fdnum].revents & (POLLHUP | POLLNVAL | POLLERR) ) { 
286                                 tlog( TL_ALARM, "TC_ReadyIO: poll return error for %s:%d",
287                                         inet_ntoa(cs[i]->serv_addr.sin_addr), 
288                                         ntohs(cs[i]->serv_addr.sin_port));
289                                 cs[i]->state = CS_ERROR;
290                                 ret = 1;
291                         } else if ( pfd[fdnum].revents & ( ( cs[i]->state == CS_READ ) ? POLLIN : POLLOUT ) ) {
292                                 cs[i]->readyio=1;
293                                 ret = 1;
294                         }
295                         fdnum++;
296                 }
297         }
298
299         tfree(pfd);
300         return ret;
301 }
302
303 u_int32_t
304 TC_Send( TC_Connection *cs ) {
305         int sz;
306         
307         if ( cs->state == CS_ERROR )
308                 return CS_ERROR;
309
310         if ( cs->state != CS_SEND ) {
311                 cs->state = CS_SEND;
312                 cs->ptr = cs->buf;
313         }
314
315         if ( cs->ptr - cs->buf >= cs->len ) {
316                 cs->state = CS_FINISHSEND;
317                 return CS_FINISHSEND;
318         }
319
320         if ((sz=write(cs->fd, cs->ptr, cs->len - (cs->ptr - cs->buf)))==0 ||
321                 (sz < 0 && (errno == EWOULDBLOCK || errno == EAGAIN))) {
322
323                 /* SunOS 4.1.x, are broken and select() says that
324                  * O_NDELAY sockets are always writable even when
325                  * they're actually not.
326                  */
327                 cs->state = CS_SEND;
328                 return CS_SEND;
329         }
330         if ( sz<0 ) {
331                 if (errno != EPIPE && errno != EINVAL)
332                         tlog(TL_ALARM, "write[%s:%d] - %s",
333                                 inet_ntoa(cs->serv_addr.sin_addr),
334                                 ntohs(cs->serv_addr.sin_port), 
335                                 strerror(errno));
336                 cs->state = CS_ERROR;
337                 return CS_ERROR;
338         }
339
340         cs->ptr += sz;
341
342         if ( cs->ptr - cs->buf >= cs->len ) {
343                 cs->state = CS_FINISHSEND;
344                 return CS_FINISHSEND;
345         }
346         
347         return cs->state;
348 }
349
350 static void 
351 resizeCS( TC_Connection *cs, int sz ) {
352         int diff = cs->ptr - cs->buf;
353         if ( cs->len >= sz )
354                 return; 
355         cs->len = sz;
356         cs->buf = (char*)trealloc( (void*)cs->buf, cs->len );
357         cs->ptr = cs->buf + diff;
358 }
359
360 u_int32_t
361 TC_Read( TC_Connection *cs ) {
362         int sz, totalread = -1, toread=0, alreadyread;
363
364         if ( cs->state == CS_ERROR )
365                 return CS_ERROR;
366
367         if (cs->state != CS_READ ) {
368                 cs->state = CS_READ;
369                 cs->ptr = cs->buf;
370         }
371
372         alreadyread = cs->ptr - cs->buf;
373         if ( alreadyread < sizeof(u_int32_t) ) {
374                 toread = sizeof(u_int32_t) - alreadyread;
375                 resizeCS(cs, sizeof(u_int32_t));
376         } else {
377                 totalread = *(u_int32_t*)(cs->buf);
378                 toread = totalread - alreadyread;
379                 if ( toread == 0 ) {
380                         cs->state = CS_FINISHREAD;
381                         return CS_FINISHREAD;
382                 }
383                 resizeCS(cs, totalread);
384         }
385
386         if ((sz=read( cs->fd, cs->ptr, toread))<0) {
387                 if (errno == EAGAIN || errno == EINTR) {
388                         cs->state = CS_READ;
389                         return CS_READ;
390                 }
391                 tlog(TL_ALARM,"read: finish - %s",strerror(errno));
392                 cs->state = CS_ERROR;
393                 return CS_ERROR;
394         }
395         
396
397         cs->ptr += sz;
398         alreadyread += sz;
399         if ( sz == 0 && alreadyread != totalread ) {
400                 tlog(TL_ALARM,"read: disconnecting");
401                 cs->state = CS_ERROR;
402                 return CS_ERROR;
403         }
404         cs->state = ( alreadyread == totalread ) ? CS_FINISHREAD : CS_READ;
405         return cs->state;
406 }
407
408 void
409 TC_FreeConnection( TC_Connection *cs ) {
410         if ( cs->state == CS_CLOSED )
411                 return;
412         if ( cs->buf ) {
413                 tfree(cs->buf);
414                 cs->buf = NULL;
415         }
416         if ( cs->fd && cs->state != CS_NOTINITED ) {
417                 shutdown(cs->fd,SHUT_RDWR);
418                 close(cs->fd);
419         }
420         cs->fd = 0;
421         cs->state = CS_CLOSED;
422 }
423
424 u_int32_t 
425 TC_Talk( TC_Connection *cs ) {
426         u_int32_t ret = TC_ServerInitConnect( cs );
427
428         while( ret == CS_INPROCESS ) {
429                 ret =  TC_ServerConnect(cs);
430         }
431
432         if ( ret != CS_CONNECTED )
433                 return ret;
434         
435         while( ret != CS_FINISHSEND ) {
436                 ret = TC_Send(cs);
437                 if ( ret == CS_ERROR ) return ret;
438         }
439
440         cs->state = CS_READ;
441         cs->ptr = cs->buf;
442         while( cs->state != CS_FINISHREAD ) {
443                 while( !TC_ReadyIO( &cs, 1, 100) );
444                 if ( TC_Read(cs) == CS_ERROR ) return CS_ERROR;
445         }
446
447         return CS_OK; 
448 }
449
450