d65060c2db28eef88d5f8c3a8ba0230b1b21e7f8
[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 (d%)", strerror(errno), 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         else 
161                 memset(sc, 0, sizeof(TC_Connection));
162         sc->serv_addr.sin_family = AF_INET;
163         sc->serv_addr.sin_addr.s_addr = (name) ? inet_addr(name) : htonl(INADDR_ANY);
164         sc->serv_addr.sin_port = htons(port);
165         sc->state = CS_NOTINITED;
166         return sc; 
167 }
168
169
170 u_int32_t
171 TC_ServerInitConnect( TC_Connection     *cs ) {
172         int flags;
173
174         if ( cs->state == CS_ERROR )
175                 return CS_ERROR;
176
177         if ((cs->fd= socket(AF_INET, SOCK_STREAM, 0)) < 0) {
178                 tlog(TL_CRIT,"socket4: %s:%d - %s",inet_ntoa(cs->serv_addr.sin_addr),
179                         ntohs(cs->serv_addr.sin_port),strerror(errno));
180                 cs->state  = CS_ERROR;
181                 return  CS_ERROR;
182         }
183
184         if ((flags=fcntl(cs->fd,F_GETFL,0)) == -1)
185                 tlog(TL_ALARM,"fcntl F_GETFL - %s",strerror(errno));
186         if (fcntl(cs->fd,F_SETFL,flags|O_NDELAY) < 0 )
187                 tlog(TL_ALARM,"fcntl O_NDELAY - %s",strerror(errno));
188
189         if ( connect(cs->fd, (struct sockaddr *) &(cs->serv_addr),
190                 sizeof(struct sockaddr_in)) < 0 ) {
191                 if ( errno == EINPROGRESS || errno == EALREADY ) {
192                         cs->state = CS_INPROCESS;
193                         return CS_INPROCESS; 
194                 } else if (errno != EISCONN && errno != EALREADY &&
195                         errno != EWOULDBLOCK && errno != EAGAIN) {
196                         tlog(TL_DEBUG,"open4: %s:%d - %s",
197                                 inet_ntoa(cs->serv_addr.sin_addr), ntohs(cs->serv_addr.sin_port),
198                                 strerror(errno));
199                         shutdown(cs->fd,SHUT_RDWR);
200                         close(cs->fd);
201                         cs->fd = 0;
202                 } else {
203                         tlog(TL_DEBUG,"nonblock connect: %s:%d - %s [%d]",
204                                 inet_ntoa(cs->serv_addr.sin_addr),
205                                 ntohs(cs->serv_addr.sin_port),
206                                 strerror(errno),errno);
207                 }
208                 cs->state = CS_ERROR;
209                 return CS_ERROR;
210         }
211
212         cs->state = CS_INPROCESS;
213         return TC_ServerConnect( cs, 0 );
214 }
215         
216
217 u_int32_t
218 TC_ServerConnect( TC_Connection *cs, int timeout ) {
219         struct pollfd   pfd;
220         int ret;
221
222         if ( cs->state != CS_INPROCESS )
223                 return cs->state;
224
225         pfd.fd = cs->fd;
226         pfd.events = POLLOUT;
227         pfd.revents = 0;
228         ret = poll( &pfd, 1, timeout );
229         if ( ret<0 ) {
230                 tlog( TL_CRIT, "TC_ServerConnect: poll: %s",
231                         strerror(errno));
232                 cs->state = CS_ERROR;
233                 return CS_ERROR;
234         } else if ( ret == 0 ) 
235                 return CS_INPROCESS;
236
237         if ( (pfd.revents & (POLLHUP | POLLNVAL | POLLERR)) ) {
238                 tlog( TL_CRIT, "TC_ServerConnect: poll return connect error for %s:%d",
239                         inet_ntoa(cs->serv_addr.sin_addr), ntohs(cs->serv_addr.sin_port));
240                 cs->state = CS_ERROR;
241                 return CS_ERROR;
242         }
243
244         if ( ! (pfd.revents & POLLOUT) )
245                 return CS_INPROCESS;
246
247
248         return setlinger( cs );
249 }
250
251 int
252 TC_ReadyIO( TC_Connection **cs, int number, int timeout ) {
253         struct pollfd   *pfd;
254         int ret,i, fdnum=0;
255
256         if ( number==0 || cs ==NULL ) {
257                 usleep( timeout * 1000.0 );
258                 return 0;
259         }
260         pfd = (struct pollfd*) tmalloc( sizeof(struct pollfd) * number );
261
262         for(i=0; i<number;i++) {
263                 if ( cs[i]->fd>0 && (cs[i]->state == CS_READ || cs[i]->state == CS_SEND) ) {
264                         pfd[fdnum].fd = cs[i]->fd;
265                         pfd[fdnum].events = ( cs[i]->state == CS_READ ) ? POLLIN : POLLOUT;
266                         pfd[fdnum].revents = 0;
267                         fdnum++;
268                 }
269                 cs[i]->readyio=0;
270         }
271         ret = poll( pfd, fdnum, timeout );
272         if ( ret<0 ) {
273                 tlog( TL_CRIT, "TC_ReadyIO: poll: %s",
274                         strerror(errno));
275                 tfree(pfd);
276                 return 0;
277         }
278
279         if ( ret == 0 ) {
280                 tfree(pfd);
281                 return 0;
282         }
283
284         fdnum=0; ret=0;
285         for(i=0; i<number;i++) {
286                 if ( cs[i]->fd>0 && (cs[i]->state == CS_READ || cs[i]->state == CS_SEND) ) {
287                         if ( pfd[fdnum].revents & (POLLHUP | POLLNVAL | POLLERR) ) { 
288                                 tlog( TL_ALARM, "TC_ReadyIO: poll return error for %s:%d",
289                                         inet_ntoa(cs[i]->serv_addr.sin_addr), 
290                                         ntohs(cs[i]->serv_addr.sin_port));
291                                 cs[i]->state = CS_ERROR;
292                                 ret = 1;
293                         } else if ( pfd[fdnum].revents & ( ( cs[i]->state == CS_READ ) ? POLLIN : POLLOUT ) ) {
294                                 cs[i]->readyio=1;
295                                 ret = 1;
296                         }
297                         fdnum++;
298                 }
299         }
300
301         tfree(pfd);
302         return ret;
303 }
304
305 u_int32_t
306 TC_Send( TC_Connection *cs ) {
307         int sz;
308         
309         if ( cs->state == CS_ERROR )
310                 return CS_ERROR;
311
312         if ( cs->state != CS_SEND ) {
313                 cs->state = CS_SEND;
314                 cs->ptr = cs->buf;
315         }
316
317         if ( cs->ptr - cs->buf >= cs->len ) {
318                 cs->state = CS_FINISHSEND;
319                 return CS_FINISHSEND;
320         }
321
322         if ((sz=write(cs->fd, cs->ptr, cs->len - (cs->ptr - cs->buf)))==0 ||
323                 (sz < 0 && (errno == EWOULDBLOCK || errno == EAGAIN))) {
324
325                 /* SunOS 4.1.x, are broken and select() says that
326                  * O_NDELAY sockets are always writable even when
327                  * they're actually not.
328                  */
329                 cs->state = CS_SEND;
330                 return CS_SEND;
331         }
332         if ( sz<0 ) {
333                 if (errno != EPIPE && errno != EINVAL)
334                         tlog(TL_ALARM, "write[%s:%d] - %s",
335                                 inet_ntoa(cs->serv_addr.sin_addr),
336                                 ntohs(cs->serv_addr.sin_port), 
337                                 strerror(errno));
338                 cs->state = CS_ERROR;
339                 return CS_ERROR;
340         }
341
342         cs->ptr += sz;
343
344         if ( cs->ptr - cs->buf >= cs->len ) {
345                 cs->state = CS_FINISHSEND;
346                 return CS_FINISHSEND;
347         }
348         
349         return cs->state;
350 }
351
352 static void 
353 resizeCS( TC_Connection *cs, int sz ) {
354         int diff = cs->ptr - cs->buf;
355         if ( cs->len >= sz )
356                 return; 
357         cs->len = sz;
358         cs->buf = (char*)trealloc( (void*)cs->buf, cs->len );
359         cs->ptr = cs->buf + diff;
360 }
361
362 u_int32_t
363 TC_Read( TC_Connection *cs ) {
364         int sz, totalread = -1, toread=0, alreadyread;
365
366         if ( cs->state == CS_ERROR )
367                 return CS_ERROR;
368
369         if (cs->state != CS_READ ) {
370                 cs->state = CS_READ;
371                 cs->ptr = cs->buf;
372         }
373
374         alreadyread = cs->ptr - cs->buf;
375         if ( alreadyread < sizeof(u_int32_t) ) {
376                 toread = sizeof(u_int32_t) - alreadyread;
377                 resizeCS(cs, sizeof(u_int32_t));
378         } else {
379                 totalread = *(u_int32_t*)(cs->buf);
380                 toread = totalread - alreadyread;
381                 if ( toread == 0 ) {
382                         cs->state = CS_FINISHREAD;
383                         return CS_FINISHREAD;
384                 }
385                 resizeCS(cs, totalread);
386         }
387
388         if ((sz=read( cs->fd, cs->ptr, toread))<0) {
389                 if (errno == EAGAIN || errno == EINTR) {
390                         cs->state = CS_READ;
391                         return CS_READ;
392                 }
393                 tlog(TL_ALARM,"read: finish - %s",strerror(errno));
394                 cs->state = CS_ERROR;
395                 return CS_ERROR;
396         }
397         
398
399         cs->ptr += sz;
400         alreadyread += sz;
401         if ( sz == 0 && alreadyread != totalread ) {
402                 tlog(TL_ALARM,"read: disconnecting");
403                 cs->state = CS_ERROR;
404                 return CS_ERROR;
405         }
406         cs->state = ( alreadyread == totalread ) ? CS_FINISHREAD : CS_READ;
407         return cs->state;
408 }
409
410 void
411 TC_FreeConnection( TC_Connection *cs ) {
412         if ( cs->state == CS_CLOSED )
413                 return;
414         if ( cs->buf ) {
415                 tfree(cs->buf);
416                 cs->buf = NULL;
417         }
418         if ( cs->fd && cs->state != CS_NOTINITED ) {
419                 shutdown(cs->fd,SHUT_RDWR);
420                 close(cs->fd);
421         }
422         cs->fd = 0;
423         cs->state = CS_CLOSED;
424 }
425
426 u_int32_t 
427 TC_Talk( TC_Connection *cs ) {
428         if ( cs->state==CS_NOTINITED ) 
429                 TC_ServerInitConnect( cs );
430
431         while( cs->state == CS_INPROCESS ) 
432                 TC_ServerConnect(cs, 100);
433
434         if ( cs->state != CS_CONNECTED )
435                 return cs->state;
436         
437         cs->state = CS_SEND;
438         cs->ptr = cs->buf;
439         while( cs->state != CS_FINISHSEND ) {
440                 while( !TC_ReadyIO( &cs, 1, 100) );
441                 if ( TC_Send(cs) == CS_ERROR ) return CS_ERROR;
442         }
443
444         cs->state = CS_READ;
445         cs->ptr = cs->buf;
446         while( cs->state != CS_FINISHREAD ) {
447                 while( !TC_ReadyIO( &cs, 1, 100) );
448                 if ( TC_Read(cs) == CS_ERROR ) return CS_ERROR;
449         }
450
451         return CS_OK; 
452 }
453
454