2 * IRC - Internet Relay Chat, ircd/os_generic.c
3 * Copyright (C) 1999 Thomas Helvey
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 1, or (at your option)
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 * @brief Implementation of OS-dependent operations.
25 #define _XOPEN_SOURCE 500 /**< make limits.h #define IOV_MAX */
26 #define __EXTENSIONS__ 1 /**< make Solaris netinet/in.h know IPv6 */
28 #include "ircd_osdep.h"
35 /* Include file dependency notes:
36 * FreeBSD requires struct timeval from sys/time.h before struct
37 * rusage in sys/resource.h.
38 * Solaris requires sys/time.h before struct rusage (indirectly) in
41 /* #include <assert.h> -- Now using assert in ircd_log.h */
47 #include <sys/ioctl.h>
48 #include <sys/types.h>
50 #include <netinet/in.h>
51 #include <sys/resource.h>
52 #include <sys/socket.h>
56 #include <sys/param.h>
64 #define IOV_MAX 16 /**< minimum required length of an iovec array */
68 #include <sys/syscall.h>
69 #define getrusage(a,b) syscall(SYS_GETRUSAGE, a, b)
73 /** Native socket address type. */
74 #define sockaddr_native sockaddr_in6
75 /** Field name inside sockaddr_native to find address family. */
76 #define sn_family sin6_family
78 /** Convert native socket address to IRC format.
79 * @param[in] v6 Native socket address.
80 * @param[out] irc IRC format socket address.
82 void sockaddr_to_irc(const struct sockaddr_in6 *v6, struct irc_sockaddr *irc)
84 if (v6->sin6_family == AF_INET6) {
85 memcpy(&irc->addr.in6_16[0], &v6->sin6_addr, sizeof(v6->sin6_addr));
86 irc->port = ntohs(v6->sin6_port);
88 else if (v6->sin6_family == AF_INET) {
89 const struct sockaddr_in *v4 = (const struct sockaddr_in*)v6;
90 memset(&irc->addr, 0, 5*sizeof(int16_t));
91 irc->addr.in6_16[5] = 0xffff;
92 memcpy(&irc->addr.in6_16[6], &v4->sin_addr, sizeof(v4->sin_addr));
93 irc->port = ntohs(v4->sin_port);
95 else assert(0 && "Unhandled native address family");
98 /** Convert IRC socket address to native format.
99 * @param[out] v6 Native socket address.
100 * @param[in] irc IRC socket address.
101 * @param[in] compat_fd If non-negative, an FD specifying address family.
102 * @return Length of address written to \a v6.
104 int sockaddr_from_irc(struct sockaddr_in6 *v6, const struct irc_sockaddr *irc, int compat_fd)
106 struct sockaddr_in6 sin6;
111 if ((0 <= compat_fd) && (0 == getsockname(compat_fd, (struct sockaddr*)&sin6, &slen)))
112 family = sin6.sin6_family;
113 else if (irc_in_addr_is_ipv4(&VirtualHost.addr))
118 memset(v6, 0, sizeof(*v6));
120 memset(v6, 0, sizeof(v6));
121 v6->sin6_family = AF_INET6;
124 else if ((family == AF_INET) && irc_in_addr_is_ipv4(&irc->addr)) {
125 struct sockaddr_in *v4 = (struct sockaddr_in*)v6;
126 v4->sin_family = AF_INET;
127 memcpy(&v4->sin_addr, &irc->addr.in6_16[6], sizeof(v4->sin_addr));
128 v4->sin_port = htons(irc->port);
132 v6->sin6_family = AF_INET6;
133 memcpy(&v6->sin6_addr, &irc->addr.in6_16[0], sizeof(v6->sin6_addr));
134 v6->sin6_port = htons(irc->port);
140 #define sockaddr_native sockaddr_in
141 #define sn_family sin_family
143 void sockaddr_to_irc(const struct sockaddr_in *v4, struct irc_sockaddr *irc)
145 assert(v4->sin_family == AF_INET);
146 memset(&irc->addr, 0, 6*sizeof(irc->addr.in6_16[0]));
147 memcpy(&irc->addr.in6_16[6], &v4->sin_addr, sizeof(v4->sin_addr));
148 irc->port = ntohs(v4->sin_port);
151 int sockaddr_from_irc(struct sockaddr_in *v4, const struct irc_sockaddr *irc, int compat_fd)
153 v4->sin_family = AF_INET;
155 assert(!irc->addr.in6_16[0] && !irc->addr.in6_16[1] && !irc->addr.in6_16[2] && !irc->addr.in6_16[3] && !irc->addr.in6_16[4] && (!irc->addr.in6_16[5] || irc->addr.in6_16[5] == 0xffff));
156 memcpy(&v4->sin_addr, &irc->addr.in6_16[6], sizeof(v4->sin_addr));
157 v4->sin_port = htons(irc->port);
159 memset(&v4, 0, sizeof(v4));
168 * This is part of the STATS replies. There is no offical numeric for this
169 * since this isnt an official command, in much the same way as HASH isnt.
170 * It is also possible that some systems wont support this call or have
171 * different field names for "struct rusage".
174 /** Send resource usage information to a client.
175 * @param[in] cptr Client requesting information.
176 * @param[in] uptime Wall time in seconds since the server started.
177 * @param[in] enumerator Function to call to send a line to \a cptr.
178 * @return Zero if some usage reports could not be sent, non-zero on success.
180 int os_get_rusage(struct Client *cptr, int uptime, EnumFn enumerator)
182 #ifdef HAVE_GETRUSAGE
195 hzz = sysconf(_SC_CLK_TCK);
200 assert(0 != enumerator);
201 if (getrusage(RUSAGE_SELF, &rus) == -1)
204 secs = rus.ru_utime.tv_sec + rus.ru_stime.tv_sec;
208 sprintf(buf, "CPU Secs %ld:%ld User %ld:%ld System %ld:%ld",
209 (long)(secs / 60), (long)(secs % 60),
210 rus.ru_utime.tv_sec / 60, rus.ru_utime.tv_sec % 60,
211 rus.ru_stime.tv_sec / 60, rus.ru_stime.tv_sec % 60);
212 (*enumerator)(cptr, buf);
214 sprintf(buf, "RSS %ld ShMem %ld Data %ld Stack %ld",
216 rus.ru_ixrss / (uptime * hzz), rus.ru_idrss / (uptime * hzz),
217 rus.ru_isrss / (uptime * hzz));
218 (*enumerator)(cptr, buf);
220 sprintf(buf, "Swaps %ld Reclaims %ld Faults %ld",
221 rus.ru_nswap, rus.ru_minflt, rus.ru_majflt);
222 (*enumerator)(cptr, buf);
224 sprintf(buf, "Block in %ld out %ld", rus.ru_inblock, rus.ru_oublock);
225 (*enumerator)(cptr, buf);
227 sprintf(buf, "Msg Rcv %ld Send %ld", rus.ru_msgrcv, rus.ru_msgsnd);
228 (*enumerator)(cptr, buf);
230 sprintf(buf, "Signals %ld Context Vol. %ld Invol %ld",
231 rus.ru_nsignals, rus.ru_nvcsw, rus.ru_nivcsw);
232 (*enumerator)(cptr, buf);
234 #else /* HAVE_GETRUSAGE */
239 int hzz = 1, ticpermin;
240 int umin, smin, usec, ssec;
242 assert(0 != enumerator);
244 hzz = sysconf(_SC_CLK_TCK);
246 ticpermin = hzz * 60;
248 umin = tmsbuf.tms_utime / ticpermin;
249 usec = (tmsbuf.tms_utime % ticpermin) / (float)hzz;
250 smin = tmsbuf.tms_stime / ticpermin;
251 ssec = (tmsbuf.tms_stime % ticpermin) / (float)hzz;
253 mins = (secs / 60) + umin + smin;
256 if (times(&tmsbuf) == -1)
258 secs = tmsbuf.tms_utime + tmsbuf.tms_stime;
260 sprintf(buf, "CPU Secs %d:%d User %d:%d System %d:%d",
261 mins, secs, umin, usec, smin, ssec);
262 (*enumerator)(cptr, buf);
263 #endif /* HAVE_TIMES */
264 #endif /* HAVE_GETRUSAGE */
268 /** Look up the most recent socket error for a socket file descriptor.
269 * @param[in] fd File descriptor to check.
270 * @return Error code from the socket, or 0 if the OS does not support this.
272 int os_get_sockerr(int fd)
275 #if defined(SO_ERROR)
276 unsigned int len = sizeof(err);
277 getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &len);
282 /** Set a file descriptor to non-blocking mode.
283 * @param[in] fd %Socket file descriptor.
284 * @return Non-zero on success, or zero on failure.
286 int os_set_nonblocking(int fd)
294 * NOTE: consult ALL your relevant manual pages *BEFORE* changing
295 * these ioctl's. There are quite a few variations on them,
296 * as can be seen by the PCS one. They are *NOT* all the same.
297 * Heed this well. - Avalon.
306 /* This portion of code might also apply to NeXT. -LynX */
309 if (ioctl(fd, FIONBIO, &res) == -1)
312 if ((res = fcntl(fd, F_GETFL, 0)) == -1)
314 else if (fcntl(fd, F_SETFL, res | nonb) == -1)
320 /** Mark a socket's address as reusable.
321 * @param[in] fd %Socket file descriptor to manipulate.
322 * @return Non-zero on success, or zero on failure.
324 int os_set_reuseaddr(int fd)
326 unsigned int opt = 1;
327 return (0 == setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
328 (const char*) &opt, sizeof(opt)));
331 /** Set a socket's send and receive buffer sizes.
332 * @param[in] fd %Socket file descriptor to manipulate.
333 * @param[in] ssize New send buffer size.
334 * @param[in] rsize New receive buffer size.
335 * @return Non-zero on success, or zero on failure.
337 int os_set_sockbufs(int fd, unsigned int ssize, unsigned int rsize)
339 unsigned int sopt = ssize;
340 unsigned int ropt = rsize;
341 return (0 == setsockopt(fd, SOL_SOCKET, SO_RCVBUF,
342 (const char*) &ropt, sizeof(ropt)) &&
343 0 == setsockopt(fd, SOL_SOCKET, SO_SNDBUF,
344 (const char*) &sopt, sizeof(sopt)));
347 /** Set a socket's "type of service" value.
348 * @param[in] fd %Socket file descriptor to manipulate.
349 * @param[in] tos New type of service value to use.
350 * @return Non-zero on success, or zero on failure.
352 int os_set_tos(int fd,int tos)
354 #if defined(IP_TOS) && defined(IPPROTO_IP)
355 unsigned int opt = tos;
356 return (0 == setsockopt(fd, IPPROTO_IP, IP_TOS, &opt, sizeof(opt)));
362 /** Disable IP options on a socket.
363 * @param[in] fd %Socket file descriptor to manipulate.
364 * @return Non-zero on success, or zero on failure.
366 int os_disable_options(int fd)
368 #if defined(IP_OPTIONS) && defined(IPPROTO_IP)
369 return (0 == setsockopt(fd, IPPROTO_IP, IP_OPTIONS, NULL, 0));
376 * Try and find the correct name to use with getrlimit() for setting the max.
377 * number of files allowed to be open by this process.
380 #define RLIMIT_FD_MAX RLIMIT_FDMAX
383 #define RLIMIT_FD_MAX RLIMIT_NOFILE
385 #ifdef RLIMIT_OPEN_MAX
386 #define RLIMIT_FD_MAX RLIMIT_OPEN_MAX
393 /** Set file descriptor limit for the process.
394 * @param[in] max_descriptors Ideal number of file descriptors.
395 * @return Zero on success; -1 on error; positive number of possible
396 * file descriptors if \a max_descriptors is too high.
398 int os_set_fdlimit(unsigned int max_descriptors)
400 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_FD_MAX)
403 if (!getrlimit(RLIMIT_FD_MAX, &limit)) {
404 if (limit.rlim_max < max_descriptors)
405 return limit.rlim_max;
406 limit.rlim_cur = limit.rlim_max; /* make soft limit the max */
407 return setrlimit(RLIMIT_FD_MAX, &limit);
409 #endif /* defined(HAVE_SETRLIMIT) && defined(RLIMIT_FD_MAX) */
413 /** Attempt to read from a non-blocking socket.
414 * @param[in] fd File descriptor to read from.
415 * @param[out] buf Output buffer to read into.
416 * @param[in] length Number of bytes to read.
417 * @param[out] count_out Receives number of bytes actually read.
418 * @return An IOResult value indicating status.
420 IOResult os_recv_nonb(int fd, char* buf, unsigned int length,
421 unsigned int* count_out)
425 assert(0 != count_out);
429 if (0 < (res = recv(fd, buf, length, 0))) {
430 *count_out = (unsigned) res;
434 if (EWOULDBLOCK == errno || EAGAIN == errno
447 * 0 == client closed the connection
453 /** Attempt to read from a non-blocking UDP socket.
454 * @param[in] fd File descriptor to read from.
455 * @param[out] buf Output buffer to read into.
456 * @param[in] length Number of bytes to read.
457 * @param[out] length_out Receives number of bytes actually read.
458 * @param[out] addr_out Peer address that sent the message.
459 * @return An IOResult value indicating status.
461 IOResult os_recvfrom_nonb(int fd, char* buf, unsigned int length,
462 unsigned int* length_out,
463 struct irc_sockaddr* addr_out)
465 struct sockaddr_native addr;
466 unsigned int len = sizeof(addr);
469 assert(0 != length_out);
470 assert(0 != addr_out);
474 res = recvfrom(fd, buf, length, 0, (struct sockaddr*) &addr, &len);
476 if (EWOULDBLOCK == errno || ENOMEM == errno
487 sockaddr_to_irc(&addr, addr_out);
492 /** Attempt to write on a non-blocking UDP socket.
493 * @param[in] fd File descriptor to write to.
494 * @param[in] buf Output buffer to send from.
495 * @param[in] length Number of bytes to write.
496 * @param[out] count_out Receives number of bytes actually written.
497 * @param[in] flags Flags for call to sendto().
498 * @param[in] peer Destination address of the message.
499 * @return An IOResult value indicating status.
501 IOResult os_sendto_nonb(int fd, const char* buf, unsigned int length,
502 unsigned int* count_out, unsigned int flags,
503 const struct irc_sockaddr* peer)
505 struct sockaddr_native addr;
512 size = sockaddr_from_irc(&addr, peer, fd);
513 if (-1 < (res = sendto(fd, buf, length, flags, (struct sockaddr*)&addr, size))) {
515 *count_out = (unsigned) res;
518 else if (EWOULDBLOCK == errno || EAGAIN == errno
530 /** Attempt to write on a connected socket.
531 * @param[in] fd File descriptor to write to.
532 * @param[in] buf Output buffer to send from.
533 * @param[in] length Number of bytes to write.
534 * @param[out] count_out Receives number of bytes actually written.
535 * @return An IOResult value indicating status.
537 IOResult os_send_nonb(int fd, const char* buf, unsigned int length,
538 unsigned int* count_out)
542 assert(0 != count_out);
546 if (-1 < (res = send(fd, buf, length, 0))) {
547 *count_out = (unsigned) res;
550 else if (EWOULDBLOCK == errno || EAGAIN == errno
562 /** Attempt a vectored write on a connected socket.
563 * @param[in] fd File descriptor to write to.
564 * @param[in] buf Message queue to send from.
565 * @param[out] count_in Number of bytes mapped from \a buf.
566 * @param[out] count_out Receives number of bytes actually written.
567 * @return An IOResult value indicating status.
569 IOResult os_sendv_nonb(int fd, struct MsgQ* buf, unsigned int* count_in,
570 unsigned int* count_out)
574 struct iovec iov[IOV_MAX];
577 assert(0 != count_in);
578 assert(0 != count_out);
584 count = msgq_mapiov(buf, iov, IOV_MAX, count_in);
586 if (-1 < (res = writev(fd, iov, count))) {
587 *count_out = (unsigned) res;
590 else if (EWOULDBLOCK == errno || EAGAIN == errno
603 /** Open a TCP or UDP socket on a particular address.
604 * @param[in] local Local address to bind to.
605 * @param[in] type SOCK_STREAM or SOCK_DGRAM.
606 * @param[in] port_name Port name (used in error diagnostics).
607 * @return Bound descriptor, or -1 on error.
609 int os_socket(const struct irc_sockaddr* local, int type, const char* port_name)
611 struct sockaddr_native addr;
614 size = sockaddr_from_irc(&addr, local, -1);
615 fd = socket(addr.sn_family, type, 0);
617 report_error(SOCKET_ERROR_MSG, port_name, errno);
620 if (fd > MAXCLIENTS - 1) {
621 report_error(CONNLIMIT_ERROR_MSG, port_name, 0);
625 if (!os_set_reuseaddr(fd)) {
626 report_error(REUSEADDR_ERROR_MSG, port_name, errno);
630 if (!os_set_nonblocking(fd)) {
631 report_error(NONB_ERROR_MSG, port_name, errno);
636 if (bind(fd, (struct sockaddr*)&addr, size)) {
637 report_error(BIND_ERROR_MSG, port_name, errno);
645 /** Accept a connection on a socket.
646 * @param[in] fd Listening file descriptor.
647 * @param[out] peer Peer address of connection.
648 * @return File descriptor for accepted connection.
650 int os_accept(int fd, struct irc_sockaddr* peer)
652 struct sockaddr_native addr;
656 addrlen = sizeof(addr);
657 new_fd = accept(fd, (struct sockaddr*)&addr, &addrlen);
659 memset(peer, 0, sizeof(*peer));
661 sockaddr_to_irc(&addr, peer);
665 /** Start a non-blocking connection.
666 * @param[in] fd Disconnected file descriptor.
667 * @param[in] sin Target address for connection.
668 * @return IOResult code indicating status.
670 IOResult os_connect_nonb(int fd, const struct irc_sockaddr* sin)
672 struct sockaddr_native addr;
675 size = sockaddr_from_irc(&addr, sin, fd);
676 if (connect(fd, (struct sockaddr*) &addr, size))
677 return (errno == EINPROGRESS) ? IO_BLOCKED : IO_FAILURE;
681 /** Get local address of a socket.
682 * @param[in] fd File descriptor to operate on.
683 * @param[out] sin_out Receives local socket address.
684 * @return Non-zero on success; zero on error.
686 int os_get_sockname(int fd, struct irc_sockaddr* sin_out)
688 struct sockaddr_native addr;
689 unsigned int len = sizeof(addr);
691 assert(0 != sin_out);
692 if (getsockname(fd, (struct sockaddr*) &addr, &len))
694 sockaddr_to_irc(&addr, sin_out);
698 /** Get remote address of a socket.
699 * @param[in] fd File descriptor to operate on.
700 * @param[out] sin_out Receives remote socket address.
701 * @return Non-zero on success; zero on error.
703 int os_get_peername(int fd, struct irc_sockaddr* sin_out)
705 struct sockaddr_native addr;
706 unsigned int len = sizeof(addr);
708 assert(0 != sin_out);
709 if (getpeername(fd, (struct sockaddr*) &addr, &len))
711 sockaddr_to_irc(&addr, sin_out);
715 /** Start listening on a socket.
716 * @param[in] fd Disconnected file descriptor.
717 * @param[in] backlog Maximum number of un-accept()ed connections to keep.
718 * @return Non-zero on success; zero on error.
720 int os_set_listen(int fd, int backlog)
722 return (0 == listen(fd, backlog));