2 * Copyright (C) 1995-2005, Index Data ApS
3 * See the file LICENSE for details.
5 * $Id: unix.c,v 1.10 2005-01-17 10:29:00 adam Exp $
6 * UNIX socket COMSTACK. By Morten Bøgeskov.
10 * \brief Implements UNIX domain socket COMSTACK
20 #include <sys/types.h>
34 #include <sys/socket.h>
47 #define YAZ_SOCKLEN_T int
50 static int unix_close(COMSTACK h);
51 static int unix_put(COMSTACK h, char *buf, int size);
52 static int unix_get(COMSTACK h, char **buf, int *bufsize);
53 static int unix_connect(COMSTACK h, void *address);
54 static int unix_more(COMSTACK h);
55 static int unix_rcvconnect(COMSTACK h);
56 static int unix_bind(COMSTACK h, void *address, int mode);
57 static int unix_listen(COMSTACK h, char *raddr, int *addrlen,
58 int (*check_ip)(void *cd, const char *a, int len, int type),
60 static int unix_set_blocking(COMSTACK p, int blocking);
62 static COMSTACK unix_accept(COMSTACK h);
63 static char *unix_addrstr(COMSTACK h);
64 static void *unix_straddr(COMSTACK h, const char *str);
67 #define SUN_LEN(ptr) ((size_t) (((struct sockaddr_un *) 0)->sun_path) \
68 + strlen ((ptr)->sun_path))
76 /* this state is used for both SSL and straight TCP/IP */
77 typedef struct unix_state
79 char *altbuf; /* alternate buffer for surplus data */
80 int altsize; /* size as xmalloced */
81 int altlen; /* length of data or 0 if none */
83 int written; /* -1 if we aren't writing */
84 int towrite; /* to verify against user input */
85 int (*complete)(const unsigned char *buf, int len); /* length/comple. */
86 struct sockaddr_un addr; /* returned by cs_straddr */
90 char buf[128]; /* returned by cs_addrstr */
93 static int unix_init (void)
99 * This function is always called through the cs_create() macro.
100 * s >= 0: socket has already been established for us.
102 COMSTACK unix_type(int s, int blocking, int protocol, void *vp)
112 if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
118 if (!(p = (struct comstack *)xmalloc(sizeof(struct comstack))))
120 if (!(state = (struct unix_state *)(p->cprivate =
121 xmalloc(sizeof(unix_state)))))
124 if (!((p->blocking = blocking)&1))
126 if (fcntl(s, F_SETFL, O_NONBLOCK) < 0)
129 signal (SIGPIPE, SIG_IGN);
136 p->protocol = (enum oid_proto) protocol;
138 p->f_connect = unix_connect;
139 p->f_rcvconnect = unix_rcvconnect;
142 p->f_close = unix_close;
143 p->f_more = unix_more;
144 p->f_bind = unix_bind;
145 p->f_listen = unix_listen;
146 p->f_accept = unix_accept;
147 p->f_addrstr = unix_addrstr;
148 p->f_straddr = unix_straddr;
149 p->f_set_blocking = unix_set_blocking;
151 p->state = new_socket ? CS_ST_UNBND : CS_ST_IDLE; /* state of line */
157 state->altsize = state->altlen = 0;
158 state->towrite = state->written = -1;
159 if (protocol == PROTO_WAIS)
160 state->complete = completeWAIS;
162 state->complete = cs_complete_auto;
164 p->timeout = COMSTACK_DEFAULT_TIMEOUT;
165 TRC(fprintf(stderr, "Created new UNIX comstack\n"));
171 static int unix_strtoaddr_ex(const char *str, struct sockaddr_un *add)
176 TRC(fprintf(stderr, "unix_strtoaddress: %s\n", str ? str : "NULL"));
177 add->sun_family = AF_UNIX;
178 strncpy(add->sun_path, str, sizeof(add->sun_path));
179 cp = strchr (add->sun_path, ':');
185 static void *unix_straddr(COMSTACK h, const char *str)
187 unix_state *sp = (unix_state *)h->cprivate;
188 char * s = strdup(str);
190 const char * file = NULL;
193 sp->uid = sp->gid = sp->umask = -1;
195 if ((eol = strchr(s, ',')))
199 if ((eol = strchr(s, ',')))
201 if (sp->uid == -1 && strncmp(s, "user=", 5) == 0)
204 if (strspn(arg, "0123456789") == strlen(arg))
210 struct passwd * pw = getpwnam(arg);
213 printf("No such user\n");
217 sp->uid = pw->pw_uid;
220 else if (sp->gid == -1 && strncmp(s, "group=", 6) == 0)
223 if (strspn(arg, "0123456789") == strlen(arg))
229 struct group * gr = getgrnam(arg);
232 printf("No such group\n");
236 sp->gid = gr->gr_gid;
239 else if (sp->umask == -1 && strncmp(s, "umask=", 6) == 0)
244 sp->umask = strtol(arg, &end, 8);
245 if (errno == EINVAL ||
248 printf("Invalid umask\n");
253 else if (file == NULL && strncmp(s, "file=", 5) == 0)
260 printf("invalid or double argument: %s\n", s);
276 TRC(fprintf(stderr, "unix_straddr: %s\n", str ? str : "NULL"));
278 if (!unix_strtoaddr_ex (file, &sp->addr))
287 struct sockaddr_un *unix_strtoaddr(const char *str)
289 static struct sockaddr_un add;
291 TRC(fprintf(stderr, "unix_strtoaddr: %s\n", str ? str : "NULL"));
293 if (!unix_strtoaddr_ex (str, &add))
298 static int unix_more(COMSTACK h)
300 unix_state *sp = (unix_state *)h->cprivate;
302 return sp->altlen && (*sp->complete)((unsigned char *) sp->altbuf,
307 * connect(2) will block (sometimes) - nothing we can do short of doing
308 * weird things like spawning subprocesses or threading or some weird junk
311 static int unix_connect(COMSTACK h, void *address)
313 struct sockaddr_un *add = (struct sockaddr_un *)address;
316 TRC(fprintf(stderr, "unix_connect\n"));
318 if (h->state != CS_ST_UNBND)
320 h->cerrno = CSOUTSTATE;
323 r = connect(h->iofile, (struct sockaddr *) add, SUN_LEN(add));
326 if (yaz_errno() == EINPROGRESS)
328 h->event = CS_CONNECT;
329 h->state = CS_ST_CONNECTING;
330 h->io_pending = CS_WANT_WRITE|CS_WANT_READ;
336 h->event = CS_CONNECT;
337 h->state = CS_ST_CONNECTING;
339 return unix_rcvconnect (h);
345 static int unix_rcvconnect(COMSTACK h)
347 TRC(fprintf(stderr, "unix_rcvconnect\n"));
349 if (h->state == CS_ST_DATAXFER)
351 if (h->state != CS_ST_CONNECTING)
353 h->cerrno = CSOUTSTATE;
357 h->state = CS_ST_DATAXFER;
361 static int unix_bind(COMSTACK h, void *address, int mode)
363 unix_state *sp = (unix_state *)h->cprivate;
364 struct sockaddr *addr = (struct sockaddr *)address;
365 const char * path = ((struct sockaddr_un *)addr)->sun_path;
366 struct stat stat_buf;
368 TRC (fprintf (stderr, "unix_bind\n"));
370 if(stat(path, &stat_buf) != -1) {
371 struct sockaddr_un socket_unix;
373 if(! S_ISSOCK(stat_buf.st_mode)) {
375 yaz_set_errno(EEXIST); /* Not a socket (File exists) */
378 if((socket_out = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
382 socket_unix.sun_family = AF_UNIX;
383 strncpy(socket_unix.sun_path, path, sizeof(socket_unix.sun_path));
384 if(connect(socket_out, (struct sockaddr *) &socket_unix, SUN_LEN(&socket_unix)) < 0) {
385 if(yaz_errno() == ECONNREFUSED) {
386 TRC (fprintf (stderr, "Socket exists but nobody is listening\n"));
394 yaz_set_errno(EADDRINUSE);
400 if (bind(h->iofile, (struct sockaddr *) addr, SUN_LEN((struct sockaddr_un *)addr)))
405 chown(path, sp->uid, sp->gid);
406 chmod(path, sp->umask != -1 ? sp->umask : 0666);
407 if (mode == CS_SERVER && listen(h->iofile, 3) < 0)
412 h->state = CS_ST_IDLE;
413 h->event = CS_LISTEN;
417 static int unix_listen(COMSTACK h, char *raddr, int *addrlen,
418 int (*check_ip)(void *cd, const char *a, int len, int t),
421 struct sockaddr_un addr;
422 YAZ_SOCKLEN_T len = sizeof(addr);
424 TRC(fprintf(stderr, "unix_listen pid=%d\n", getpid()));
425 if (h->state != CS_ST_IDLE)
427 h->cerrno = CSOUTSTATE;
430 h->newfd = accept(h->iofile, (struct sockaddr*)&addr, &len);
434 yaz_errno() == EWOULDBLOCK
436 #if EAGAIN != EWOULDBLOCK
437 || yaz_errno() == EAGAIN
441 h->cerrno = CSNODATA;
446 if (addrlen && (size_t) (*addrlen) >= sizeof(struct sockaddr_un))
447 memcpy(raddr, &addr, *addrlen = sizeof(struct sockaddr_un));
450 h->state = CS_ST_INCON;
454 static COMSTACK unix_accept(COMSTACK h)
457 unix_state *state, *st = (unix_state *)h->cprivate;
459 TRC(fprintf(stderr, "unix_accept\n"));
460 if (h->state == CS_ST_INCON)
462 if (!(cnew = (COMSTACK)xmalloc(sizeof(*cnew))))
469 memcpy(cnew, h, sizeof(*h));
470 cnew->iofile = h->newfd;
471 cnew->io_pending = 0;
472 if (!(state = (unix_state *)
473 (cnew->cprivate = xmalloc(sizeof(unix_state)))))
483 if (!(cnew->blocking&1) &&
484 (fcntl(cnew->iofile, F_SETFL, O_NONBLOCK) < 0)
499 state->altsize = state->altlen = 0;
500 state->towrite = state->written = -1;
501 state->complete = st->complete;
502 memcpy(&state->addr, &st->addr, sizeof(state->addr));
503 cnew->state = CS_ST_ACCEPT;
504 cnew->event = CS_NONE;
505 h->state = CS_ST_IDLE;
509 if (h->state == CS_ST_ACCEPT)
514 h->cerrno = CSOUTSTATE;
518 h->state = CS_ST_DATAXFER;
523 #define CS_UNIX_BUFCHUNK 4096
526 * Return: -1 error, >1 good, len of buffer, ==1 incomplete buffer,
527 * 0=connection closed.
529 static int unix_get(COMSTACK h, char **buf, int *bufsize)
531 unix_state *sp = (unix_state *)h->cprivate;
533 int tmpi, berlen, rest, req, tomove;
534 int hasread = 0, res;
536 TRC(fprintf(stderr, "unix_get: bufsize=%d\n", *bufsize));
537 if (sp->altlen) /* switch buffers */
539 TRC(fprintf(stderr, " %d bytes in altbuf (0x%x)\n", sp->altlen,
540 (unsigned) sp->altbuf));
544 *bufsize = sp->altsize;
545 hasread = sp->altlen;
551 while (!(berlen = (*sp->complete)((unsigned char *)*buf, hasread)))
555 if (!(*buf = (char *)xmalloc(*bufsize = CS_UNIX_BUFCHUNK)))
558 else if (*bufsize - hasread < CS_UNIX_BUFCHUNK)
559 if (!(*buf =(char *)xrealloc(*buf, *bufsize *= 2)))
561 res = recv(h->iofile, *buf + hasread, CS_UNIX_BUFCHUNK, 0);
562 TRC(fprintf(stderr, " recv res=%d, hasread=%d\n", res, hasread));
565 if (yaz_errno() == EWOULDBLOCK
567 #if EAGAIN != EWOULDBLOCK
568 || yaz_errno() == EAGAIN
571 || yaz_errno() == EINPROGRESS
574 h->io_pending = CS_WANT_READ;
577 else if (yaz_errno() == 0)
586 TRC (fprintf (stderr, " Out of read loop with hasread=%d, berlen=%d\n",
588 /* move surplus buffer (or everything if we didn't get a BER rec.) */
589 if (hasread > berlen)
591 tomove = req = hasread - berlen;
592 rest = tomove % CS_UNIX_BUFCHUNK;
594 req += CS_UNIX_BUFCHUNK - rest;
597 if (!(sp->altbuf = (char *)xmalloc(sp->altsize = req)))
599 } else if (sp->altsize < req)
600 if (!(sp->altbuf =(char *)xrealloc(sp->altbuf, sp->altsize = req)))
602 TRC(fprintf(stderr, " Moving %d bytes to altbuf(0x%x)\n", tomove,
603 (unsigned) sp->altbuf));
604 memcpy(sp->altbuf, *buf + berlen, sp->altlen = tomove);
606 if (berlen < CS_UNIX_BUFCHUNK - 1)
607 *(*buf + berlen) = '\0';
608 return berlen ? berlen : 1;
615 * In nonblocking mode, you must call again with same buffer while
618 static int unix_put(COMSTACK h, char *buf, int size)
621 struct unix_state *state = (struct unix_state *)h->cprivate;
623 TRC(fprintf(stderr, "unix_put: size=%d\n", size));
626 if (state->towrite < 0)
628 state->towrite = size;
631 else if (state->towrite != size)
633 h->cerrno = CSWRONGBUF;
636 while (state->towrite > state->written)
639 send(h->iofile, buf + state->written, size -
649 yaz_errno() == EWOULDBLOCK
651 #if EAGAIN != EWOULDBLOCK
652 || yaz_errno() == EAGAIN
657 TRC(fprintf(stderr, " Flow control stop\n"));
658 h->io_pending = CS_WANT_WRITE;
664 state->written += res;
665 TRC(fprintf(stderr, " Wrote %d, written=%d, nbytes=%d\n",
666 res, state->written, size));
668 state->towrite = state->written = -1;
669 TRC(fprintf(stderr, " Ok\n"));
673 static int unix_close(COMSTACK h)
675 unix_state *sp = (struct unix_state *)h->cprivate;
677 TRC(fprintf(stderr, "unix_close\n"));
689 static char *unix_addrstr(COMSTACK h)
691 unix_state *sp = (struct unix_state *)h->cprivate;
693 sprintf(buf, "unix:%s", sp->addr.sun_path);
697 static int unix_set_blocking(COMSTACK p, int blocking)
701 if (p->blocking == blocking)
703 flag = fcntl(p->iofile, F_GETFL, 0);
705 flag = flag & ~O_NONBLOCK;
707 flag = flag | O_NONBLOCK;
708 if (fcntl(p->iofile, F_SETFL, flag) < 0)
710 p->blocking = blocking;