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