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 *)tmalloc(sizeof(TC_Connection));
 160         memset(sc, 0, sizeof(TC_Connection));
 161         sc->serv_addr.sin_family = AF_INET;
 162         sc->serv_addr.sin_addr.s_addr = (name && *name != '*' ) ? inet_addr(name) : htonl(INADDR_ANY);
 163         if ( sc->serv_addr.sin_addr.s_addr == INADDR_NONE ) {
 164                 struct hostent *host;
 165
 166                 /*
 167                  * Can't parse address: it's a DNS Name
 168                  */
 169                 host = gethostbyname(name);
 170                 if ( host && host->h_addrtype == AF_INET ) {
 171                         memcpy(&sc->serv_addr.sin_addr.s_addr, host->h_addr_list[0],
 172                                 sizeof(&sc->serv_addr.sin_addr.s_addr));
 173                 } else {
 174 #ifdef HAVE_HSTRERROR
 175                         tlog(TL_CRIT,"gethostbyname: %s - %s", name, hstrerror(h_errno));
 176 #else
 177                         tlog(TL_CRIT,"gethostbyname: %s - %s", name, strerror(errno));
 178 #endif
 179                         sc->state = CS_ERROR;
 180                         return sc;
 181                 }
 182         }
 183
 184         sc->serv_addr.sin_port = htons(port);
 185         sc->state = CS_NOTINITED;
 186         return sc;
 187 }
 188
 189
 190 u_int32_t
 191 TC_ServerInitConnect( TC_Connection     *cs ) {
 192         int flags;
 193
 194         if ( cs->state == CS_ERROR )
 195                 return CS_ERROR;
 196
 197         if ((cs->fd= socket(AF_INET, SOCK_STREAM, 0)) < 0) {
 198                 tlog(TL_CRIT,"socket4: %s:%d - %s",inet_ntoa(cs->serv_addr.sin_addr),
 199                         ntohs(cs->serv_addr.sin_port),strerror(errno));
 200                 cs->state  = CS_ERROR;
 201                 return  CS_ERROR;
 202         }
 203
 204         if ((flags=fcntl(cs->fd,F_GETFL,0)) == -1)
 205                 tlog(TL_ALARM,"fcntl F_GETFL - %s",strerror(errno));
 206         if (fcntl(cs->fd,F_SETFL,flags|O_NDELAY) < 0 )
 207                 tlog(TL_ALARM,"fcntl O_NDELAY - %s",strerror(errno));
 208
 209         flags=1;
 210         if (setsockopt(cs->fd, SOL_SOCKET, SO_REUSEADDR, &flags, sizeof(flags)) < 0)
 211                 tlog(TL_ALARM, "socketsockopt failed: %s (%d)", strerror(errno), errno);
 212
 213         if ( connect(cs->fd, (struct sockaddr *) &(cs->serv_addr),
 214                 sizeof(struct sockaddr_in)) < 0 ) {
 215                 if ( errno == EINPROGRESS || errno == EALREADY ) {
 216                         cs->state = CS_INPROCESS;
 217                         return CS_INPROCESS;
 218                 } else if (errno != EISCONN && errno != EALREADY &&
 219                         errno != EWOULDBLOCK && errno != EAGAIN) {
 220                         tlog(TL_DEBUG,"connect: %s:%d - %s",
 221                                 inet_ntoa(cs->serv_addr.sin_addr), ntohs(cs->serv_addr.sin_port),
 222                                 strerror(errno));
 223                         shutdown(cs->fd,SHUT_RDWR);
 224                         close(cs->fd);
 225                         cs->fd = 0;
 226                 } else {
 227                         tlog(TL_DEBUG,"nonblock connect: %s:%d - %s [%d]",
 228                                 inet_ntoa(cs->serv_addr.sin_addr),
 229                                 ntohs(cs->serv_addr.sin_port),
 230                                 strerror(errno),errno);
 231                 }
 232                 cs->state = CS_ERROR;
 233                 return CS_ERROR;
 234         }
 235
 236         cs->state = CS_INPROCESS;
 237         return TC_ServerConnect( cs, 0 );
 238 }
 239
 240
 241 u_int32_t
 242 TC_ServerConnect( TC_Connection *cs, int timeout ) {
 243         struct pollfd   pfd;
 244         int ret;
 245
 246         if ( cs->state != CS_INPROCESS )
 247                 return cs->state;
 248
 249         pfd.fd = cs->fd;
 250         pfd.events = POLLOUT;
 251         pfd.revents = 0;
 252         ret = poll( &pfd, 1, timeout );
 253         if ( ret<0 ) {
 254                 tlog( TL_CRIT, "TC_ServerConnect: poll: %s",
 255                         strerror(errno));
 256                 cs->state = CS_ERROR;
 257                 return CS_ERROR;
 258         } else if ( ret == 0 )
 259                 return CS_INPROCESS;
 260
 261         if ( (pfd.revents & (POLLHUP | POLLNVAL | POLLERR)) ) {
 262                 tlog( TL_CRIT, "TC_ServerConnect: poll return connect error for %s:%d",
 263                         inet_ntoa(cs->serv_addr.sin_addr), ntohs(cs->serv_addr.sin_port));
 264                 cs->state = CS_ERROR;
 265                 return CS_ERROR;
 266         }
 267
 268         if ( ! (pfd.revents & POLLOUT) )
 269                 return CS_INPROCESS;
 270
 271
 272         return setlinger( cs );
 273 }
 274
 275 int
 276 TC_ReadyIO( TC_Connection **cs, int number, int timeout ) {
 277         struct pollfd   *pfd;
 278         int ret,i, fdnum=0;
 279
 280         if ( number==0 || cs ==NULL ) {
 281                 if (timeout<0)
 282                         timeout=1000;
 283                 usleep( timeout * 1000.0 );
 284                 return 0;
 285         }
 286         pfd = (struct pollfd*) tmalloc( sizeof(struct pollfd) * number );
 287
 288         for(i=0; i<number;i++) {
 289                 if ( cs[i]->fd>0 && (cs[i]->state == CS_READ || cs[i]->state == CS_SEND) ) {
 290                         pfd[fdnum].fd = cs[i]->fd;
 291                         pfd[fdnum].events = ( cs[i]->state == CS_READ ) ? POLLIN : POLLOUT;
 292                         pfd[fdnum].revents = 0;
 293                         fdnum++;
 294                 }
 295                 cs[i]->readyio=0;
 296         }
 297
 298         if ( fdnum==0 ) {
 299                 tfree(pfd);
 300                 if (timeout<0)
 301                         timeout=1000;
 302                 usleep( timeout * 1000.0 );
 303                 return 0;
 304         }
 305         ret = poll( pfd, fdnum, timeout );
 306         if ( ret<0 ) {
 307                 tlog( TL_CRIT, "TC_ReadyIO: poll: %s",
 308                         strerror(errno));
 309                 tfree(pfd);
 310                 return 0;
 311         }
 312
 313         if ( ret == 0 ) {
 314                 tfree(pfd);
 315                 return 0;
 316         }
 317
 318         fdnum=0; ret=0;
 319         for(i=0; i<number;i++) {
 320                 if ( cs[i]->fd>0 && (cs[i]->state == CS_READ || cs[i]->state == CS_SEND) ) {
 321                         if ( pfd[fdnum].revents & (POLLHUP | POLLNVAL | POLLERR) ) {
 322                                 tlog( TL_ALARM, "TC_ReadyIO: poll return error for %s:%d",
 323                                         inet_ntoa(cs[i]->serv_addr.sin_addr),
 324                                         ntohs(cs[i]->serv_addr.sin_port));
 325                                 cs[i]->state = CS_ERROR;
 326                                 ret = 1;
 327                         } else if ( pfd[fdnum].revents & ( ( cs[i]->state == CS_READ ) ? POLLIN : POLLOUT ) ) {
 328                                 cs[i]->readyio=1;
 329                                 ret = 1;
 330                         }
 331                         fdnum++;
 332                 }
 333         }
 334
 335         tfree(pfd);
 336         return ret;
 337 }
 338
 339 u_int32_t
 340 TC_Send( TC_Connection *cs ) {
 341         int sz;
 342
 343         if ( cs->state == CS_ERROR )
 344                 return CS_ERROR;
 345
 346         if ( cs->state != CS_SEND ) {
 347                 cs->state = CS_SEND;
 348                 cs->ptr = cs->buf;
 349         }
 350
 351         if ( cs->ptr - cs->buf >= cs->len ) {
 352                 cs->state = CS_FINISHSEND;
 353                 return CS_FINISHSEND;
 354         }
 355
 356         if ((sz=write(cs->fd, cs->ptr, cs->len - (cs->ptr - cs->buf)))==0 ||
 357                 (sz < 0 && (errno == EWOULDBLOCK || errno == EAGAIN))) {
 358
 359                 /* SunOS 4.1.x, are broken and select() says that
 360                  * O_NDELAY sockets are always writable even when
 361                  * they're actually not.
 362                  */
 363                 cs->state = CS_SEND;
 364                 return CS_SEND;
 365         }
 366         if ( sz<0 ) {
 367                 if (errno != EPIPE && errno != EINVAL)
 368                         tlog(TL_ALARM, "write[%s:%d] - %s",
 369                                 inet_ntoa(cs->serv_addr.sin_addr),
 370                                 ntohs(cs->serv_addr.sin_port),
 371                                 strerror(errno));
 372                 cs->state = CS_ERROR;
 373                 return CS_ERROR;
 374         }
 375
 376         cs->ptr += sz;
 377
 378         if ( cs->ptr - cs->buf >= cs->len ) {
 379                 cs->state = CS_FINISHSEND;
 380                 return CS_FINISHSEND;
 381         }
 382
 383         return cs->state;
 384 }
 385
 386 static void
 387 resizeCS( TC_Connection *cs, int sz ) {
 388         int diff = cs->ptr - cs->buf;
 389         if ( cs->len >= sz )
 390                 return;
 391         cs->len = sz;
 392         cs->buf = (char*)trealloc( (void*)cs->buf, cs->len );
 393         cs->ptr = cs->buf + diff;
 394 }
 395
 396 u_int32_t
 397 TC_Read( TC_Connection *cs ) {
 398         int sz, totalread = -1, toread=0, alreadyread;
 399
 400         if ( cs->state == CS_ERROR )
 401                 return CS_ERROR;
 402
 403         if (cs->state != CS_READ ) {
 404                 cs->state = CS_READ;
 405                 cs->ptr = cs->buf;
 406         }
 407
 408         alreadyread = cs->ptr - cs->buf;
 409         if ( alreadyread < sizeof(u_int32_t) ) {
 410                 toread = sizeof(u_int32_t) - alreadyread;
 411                 resizeCS(cs, sizeof(u_int32_t));
 412         } else {
 413                 totalread = *(u_int32_t*)(cs->buf);
 414                 toread = totalread - alreadyread;
 415                 if ( toread == 0 ) {
 416                         cs->state = CS_FINISHREAD;
 417                         return CS_FINISHREAD;
 418                 }
 419                 resizeCS(cs, totalread);
 420         }
 421
 422         if ((sz=read( cs->fd, cs->ptr, toread))<0) {
 423                 if (errno == EAGAIN || errno == EINTR) {
 424                         cs->state = CS_READ;
 425                         return CS_READ;
 426                 }
 427                 tlog(TL_ALARM,"read: finish - %s",strerror(errno));
 428                 cs->state = CS_ERROR;
 429                 return CS_ERROR;
 430         }
 431
 432
 433         cs->ptr += sz;
 434         alreadyread += sz;
 435         if ( sz == 0 && alreadyread != totalread ) {
 436                 tlog(TL_ALARM,"read: disconnecting");
 437                 cs->state = CS_ERROR;
 438                 return CS_ERROR;
 439         }
 440         cs->state = ( alreadyread == totalread ) ? CS_FINISHREAD : CS_READ;
 441         return cs->state;
 442 }
 443
 444 void
 445 TC_FreeConnection( TC_Connection *cs ) {
 446         if ( cs->state == CS_CLOSED )
 447                 return;
 448         if ( cs->buf ) {
 449                 tfree(cs->buf);
 450                 cs->buf = NULL;
 451         }
 452         if ( cs->fd && cs->state != CS_NOTINITED ) {
 453                 shutdown(cs->fd,SHUT_RDWR);
 454                 close(cs->fd);
 455         }
 456         cs->fd = 0;
 457         cs->state = CS_CLOSED;
 458 }
 459
 460 u_int32_t
 461 TC_Talk( TC_Connection *cs ) {
 462         if ( cs->state==CS_NOTINITED )
 463                 TC_ServerInitConnect( cs );
 464
 465         while( cs->state == CS_INPROCESS )
 466                 TC_ServerConnect(cs, 100);
 467
 468         if ( cs->state != CS_CONNECTED )
 469                 return cs->state;
 470
 471         cs->state = CS_SEND;
 472         cs->ptr = cs->buf;
 473         while( cs->state != CS_FINISHSEND ) {
 474                 while( !TC_ReadyIO( &cs, 1, 100) );
 475                 if ( TC_Send(cs) == CS_ERROR ) return CS_ERROR;
 476         }
 477
 478         cs->state = CS_READ;
 479         cs->ptr = cs->buf;
 480         while( cs->state != CS_FINISHREAD ) {
 481                 while( !TC_ReadyIO( &cs, 1, 100) );
 482                 if ( TC_Read(cs) == CS_ERROR ) return CS_ERROR;
 483         }
 484
 485         return CS_OK;
 486 }
 487
 488