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) {
112 if (0 == getsockname(compat_fd, (struct sockaddr*)&sin6, &slen))
113 family = sin6.sin6_family;
114 else if (irc_in_addr_is_ipv4(&VirtualHost.addr))
119 if (irc_in_addr_is_ipv4(&irc->addr))
125 memset(v6, 0, sizeof(*v6));
127 memset(v6, 0, sizeof(v6));
128 v6->sin6_family = AF_INET6;
131 else if ((family == AF_INET) && irc_in_addr_is_ipv4(&irc->addr)) {
132 struct sockaddr_in *v4 = (struct sockaddr_in*)v6;
133 v4->sin_family = AF_INET;
134 memcpy(&v4->sin_addr, &irc->addr.in6_16[6], sizeof(v4->sin_addr));
135 v4->sin_port = htons(irc->port);
139 v6->sin6_family = AF_INET6;
140 memcpy(&v6->sin6_addr, &irc->addr.in6_16[0], sizeof(v6->sin6_addr));
141 v6->sin6_port = htons(irc->port);
147 #define sockaddr_native sockaddr_in
148 #define sn_family sin_family
150 void sockaddr_to_irc(const struct sockaddr_in *v4, struct irc_sockaddr *irc)
152 assert(v4->sin_family == AF_INET);
153 memset(&irc->addr, 0, 6*sizeof(irc->addr.in6_16[0]));
154 memcpy(&irc->addr.in6_16[6], &v4->sin_addr, sizeof(v4->sin_addr));
155 irc->port = ntohs(v4->sin_port);
158 int sockaddr_from_irc(struct sockaddr_in *v4, const struct irc_sockaddr *irc, int compat_fd)
160 v4->sin_family = AF_INET;
162 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));
163 memcpy(&v4->sin_addr, &irc->addr.in6_16[6], sizeof(v4->sin_addr));
164 v4->sin_port = htons(irc->port);
166 memset(&v4, 0, sizeof(v4));
175 * This is part of the STATS replies. There is no offical numeric for this
176 * since this isnt an official command, in much the same way as HASH isnt.
177 * It is also possible that some systems wont support this call or have
178 * different field names for "struct rusage".
181 /** Send resource usage information to a client.
182 * @param[in] cptr Client requesting information.
183 * @param[in] uptime Wall time in seconds since the server started.
184 * @param[in] enumerator Function to call to send a line to \a cptr.
185 * @return Zero if some usage reports could not be sent, non-zero on success.
187 int os_get_rusage(struct Client *cptr, int uptime, EnumFn enumerator)
189 #ifdef HAVE_GETRUSAGE
202 hzz = sysconf(_SC_CLK_TCK);
207 assert(0 != enumerator);
208 if (getrusage(RUSAGE_SELF, &rus) == -1)
211 secs = rus.ru_utime.tv_sec + rus.ru_stime.tv_sec;
215 sprintf(buf, "CPU Secs %ld:%ld User %ld:%ld System %ld:%ld",
216 (long)(secs / 60), (long)(secs % 60),
217 rus.ru_utime.tv_sec / 60, rus.ru_utime.tv_sec % 60,
218 rus.ru_stime.tv_sec / 60, rus.ru_stime.tv_sec % 60);
219 (*enumerator)(cptr, buf);
221 sprintf(buf, "RSS %ld ShMem %ld Data %ld Stack %ld",
223 rus.ru_ixrss / (uptime * hzz), rus.ru_idrss / (uptime * hzz),
224 rus.ru_isrss / (uptime * hzz));
225 (*enumerator)(cptr, buf);
227 sprintf(buf, "Swaps %ld Reclaims %ld Faults %ld",
228 rus.ru_nswap, rus.ru_minflt, rus.ru_majflt);
229 (*enumerator)(cptr, buf);
231 sprintf(buf, "Block in %ld out %ld", rus.ru_inblock, rus.ru_oublock);
232 (*enumerator)(cptr, buf);
234 sprintf(buf, "Msg Rcv %ld Send %ld", rus.ru_msgrcv, rus.ru_msgsnd);
235 (*enumerator)(cptr, buf);
237 sprintf(buf, "Signals %ld Context Vol. %ld Invol %ld",
238 rus.ru_nsignals, rus.ru_nvcsw, rus.ru_nivcsw);
239 (*enumerator)(cptr, buf);
241 #else /* HAVE_GETRUSAGE */
246 int hzz = 1, ticpermin;
247 int umin, smin, usec, ssec;
249 assert(0 != enumerator);
251 hzz = sysconf(_SC_CLK_TCK);
253 ticpermin = hzz * 60;
255 umin = tmsbuf.tms_utime / ticpermin;
256 usec = (tmsbuf.tms_utime % ticpermin) / (float)hzz;
257 smin = tmsbuf.tms_stime / ticpermin;
258 ssec = (tmsbuf.tms_stime % ticpermin) / (float)hzz;
260 mins = (secs / 60) + umin + smin;
263 if (times(&tmsbuf) == -1)
265 secs = tmsbuf.tms_utime + tmsbuf.tms_stime;
267 sprintf(buf, "CPU Secs %d:%d User %d:%d System %d:%d",
268 mins, secs, umin, usec, smin, ssec);
269 (*enumerator)(cptr, buf);
270 #endif /* HAVE_TIMES */
271 #endif /* HAVE_GETRUSAGE */
275 /** Look up the most recent socket error for a socket file descriptor.
276 * @param[in] fd File descriptor to check.
277 * @return Error code from the socket, or 0 if the OS does not support this.
279 int os_get_sockerr(int fd)
282 #if defined(SO_ERROR)
283 unsigned int len = sizeof(err);
284 getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &len);
289 /** Set a file descriptor to non-blocking mode.
290 * @param[in] fd %Socket file descriptor.
291 * @return Non-zero on success, or zero on failure.
293 int os_set_nonblocking(int fd)
301 * NOTE: consult ALL your relevant manual pages *BEFORE* changing
302 * these ioctl's. There are quite a few variations on them,
303 * as can be seen by the PCS one. They are *NOT* all the same.
304 * Heed this well. - Avalon.
313 /* This portion of code might also apply to NeXT. -LynX */
316 if (ioctl(fd, FIONBIO, &res) == -1)
319 if ((res = fcntl(fd, F_GETFL, 0)) == -1)
321 else if (fcntl(fd, F_SETFL, res | nonb) == -1)
327 /** Mark a socket's address as reusable.
328 * @param[in] fd %Socket file descriptor to manipulate.
329 * @return Non-zero on success, or zero on failure.
331 int os_set_reuseaddr(int fd)
333 unsigned int opt = 1;
334 return (0 == setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
335 (const char*) &opt, sizeof(opt)));
338 /** Set a socket's send and receive buffer sizes.
339 * @param[in] fd %Socket file descriptor to manipulate.
340 * @param[in] ssize New send buffer size.
341 * @param[in] rsize New receive buffer size.
342 * @return Non-zero on success, or zero on failure.
344 int os_set_sockbufs(int fd, unsigned int ssize, unsigned int rsize)
346 unsigned int sopt = ssize;
347 unsigned int ropt = rsize;
348 return (0 == setsockopt(fd, SOL_SOCKET, SO_RCVBUF,
349 (const char*) &ropt, sizeof(ropt)) &&
350 0 == setsockopt(fd, SOL_SOCKET, SO_SNDBUF,
351 (const char*) &sopt, sizeof(sopt)));
354 /** Set a socket's "type of service" value.
355 * @param[in] fd %Socket file descriptor to manipulate.
356 * @param[in] tos New type of service value to use.
357 * @return Non-zero on success, or zero on failure.
359 int os_set_tos(int fd,int tos)
361 #if defined(IP_TOS) && defined(IPPROTO_IP)
362 unsigned int opt = tos;
363 return (0 == setsockopt(fd, IPPROTO_IP, IP_TOS, &opt, sizeof(opt)));
369 /** Disable IP options on a socket.
370 * @param[in] fd %Socket file descriptor to manipulate.
371 * @return Non-zero on success, or zero on failure.
373 int os_disable_options(int fd)
375 #if defined(IP_OPTIONS) && defined(IPPROTO_IP)
376 return (0 == setsockopt(fd, IPPROTO_IP, IP_OPTIONS, NULL, 0));
383 * Try and find the correct name to use with getrlimit() for setting the max.
384 * number of files allowed to be open by this process.
387 #define RLIMIT_FD_MAX RLIMIT_FDMAX
390 #define RLIMIT_FD_MAX RLIMIT_NOFILE
392 #ifdef RLIMIT_OPEN_MAX
393 #define RLIMIT_FD_MAX RLIMIT_OPEN_MAX
400 /** Set file descriptor limit for the process.
401 * @param[in] max_descriptors Ideal number of file descriptors.
402 * @return Zero on success; -1 on error; positive number of possible
403 * file descriptors if \a max_descriptors is too high.
405 int os_set_fdlimit(unsigned int max_descriptors)
407 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_FD_MAX)
410 if (!getrlimit(RLIMIT_FD_MAX, &limit)) {
411 if (limit.rlim_max < max_descriptors)
412 return limit.rlim_max;
413 limit.rlim_cur = limit.rlim_max; /* make soft limit the max */
414 return setrlimit(RLIMIT_FD_MAX, &limit);
416 #endif /* defined(HAVE_SETRLIMIT) && defined(RLIMIT_FD_MAX) */
420 /** Attempt to read from a non-blocking socket.
421 * @param[in] fd File descriptor to read from.
422 * @param[out] buf Output buffer to read into.
423 * @param[in] length Number of bytes to read.
424 * @param[out] count_out Receives number of bytes actually read.
425 * @return An IOResult value indicating status.
427 IOResult os_recv_nonb(int fd, char* buf, unsigned int length,
428 unsigned int* count_out)
432 assert(0 != count_out);
436 if (0 < (res = recv(fd, buf, length, 0))) {
437 *count_out = (unsigned) res;
441 if (EWOULDBLOCK == errno || EAGAIN == errno
454 * 0 == client closed the connection
460 /** Attempt to read from a non-blocking UDP socket.
461 * @param[in] fd File descriptor to read from.
462 * @param[out] buf Output buffer to read into.
463 * @param[in] length Number of bytes to read.
464 * @param[out] length_out Receives number of bytes actually read.
465 * @param[out] addr_out Peer address that sent the message.
466 * @return An IOResult value indicating status.
468 IOResult os_recvfrom_nonb(int fd, char* buf, unsigned int length,
469 unsigned int* length_out,
470 struct irc_sockaddr* addr_out)
472 struct sockaddr_native addr;
473 unsigned int len = sizeof(addr);
476 assert(0 != length_out);
477 assert(0 != addr_out);
481 res = recvfrom(fd, buf, length, 0, (struct sockaddr*) &addr, &len);
483 if (EWOULDBLOCK == errno || ENOMEM == errno
494 sockaddr_to_irc(&addr, addr_out);
499 /** Attempt to write on a non-blocking UDP socket.
500 * @param[in] fd File descriptor to write to.
501 * @param[in] buf Output buffer to send from.
502 * @param[in] length Number of bytes to write.
503 * @param[out] count_out Receives number of bytes actually written.
504 * @param[in] flags Flags for call to sendto().
505 * @param[in] peer Destination address of the message.
506 * @return An IOResult value indicating status.
508 IOResult os_sendto_nonb(int fd, const char* buf, unsigned int length,
509 unsigned int* count_out, unsigned int flags,
510 const struct irc_sockaddr* peer)
512 struct sockaddr_native addr;
519 size = sockaddr_from_irc(&addr, peer, fd);
520 if (-1 < (res = sendto(fd, buf, length, flags, (struct sockaddr*)&addr, size))) {
522 *count_out = (unsigned) res;
525 else if (EWOULDBLOCK == errno || EAGAIN == errno
537 /** Attempt to write on a connected socket.
538 * @param[in] fd File descriptor to write to.
539 * @param[in] buf Output buffer to send from.
540 * @param[in] length Number of bytes to write.
541 * @param[out] count_out Receives number of bytes actually written.
542 * @return An IOResult value indicating status.
544 IOResult os_send_nonb(int fd, const char* buf, unsigned int length,
545 unsigned int* count_out)
549 assert(0 != count_out);
553 if (-1 < (res = send(fd, buf, length, 0))) {
554 *count_out = (unsigned) res;
557 else if (EWOULDBLOCK == errno || EAGAIN == errno
569 /** Attempt a vectored write on a connected socket.
570 * @param[in] fd File descriptor to write to.
571 * @param[in] buf Message queue to send from.
572 * @param[out] count_in Number of bytes mapped from \a buf.
573 * @param[out] count_out Receives number of bytes actually written.
574 * @return An IOResult value indicating status.
576 IOResult os_sendv_nonb(int fd, struct MsgQ* buf, unsigned int* count_in,
577 unsigned int* count_out)
581 struct iovec iov[IOV_MAX];
584 assert(0 != count_in);
585 assert(0 != count_out);
591 count = msgq_mapiov(buf, iov, IOV_MAX, count_in);
593 if (-1 < (res = writev(fd, iov, count))) {
594 *count_out = (unsigned) res;
597 else if (EWOULDBLOCK == errno || EAGAIN == errno
610 /** Open a TCP or UDP socket on a particular address.
611 * @param[in] local Local address to bind to.
612 * @param[in] type SOCK_STREAM or SOCK_DGRAM.
613 * @param[in] port_name Port name (used in error diagnostics).
614 * @return Bound descriptor, or -1 on error.
616 int os_socket(const struct irc_sockaddr* local, int type, const char* port_name)
618 struct sockaddr_native addr;
621 size = sockaddr_from_irc(&addr, local, -1);
622 fd = socket(addr.sn_family, type, 0);
624 report_error(SOCKET_ERROR_MSG, port_name, errno);
627 if (fd > MAXCLIENTS - 1) {
628 report_error(CONNLIMIT_ERROR_MSG, port_name, 0);
632 if (!os_set_reuseaddr(fd)) {
633 report_error(REUSEADDR_ERROR_MSG, port_name, errno);
637 if (!os_set_nonblocking(fd)) {
638 report_error(NONB_ERROR_MSG, port_name, errno);
643 if (bind(fd, (struct sockaddr*)&addr, size)) {
644 report_error(BIND_ERROR_MSG, port_name, errno);
652 /** Accept a connection on a socket.
653 * @param[in] fd Listening file descriptor.
654 * @param[out] peer Peer address of connection.
655 * @return File descriptor for accepted connection.
657 int os_accept(int fd, struct irc_sockaddr* peer)
659 struct sockaddr_native addr;
663 addrlen = sizeof(addr);
664 new_fd = accept(fd, (struct sockaddr*)&addr, &addrlen);
666 memset(peer, 0, sizeof(*peer));
668 sockaddr_to_irc(&addr, peer);
672 /** Start a non-blocking connection.
673 * @param[in] fd Disconnected file descriptor.
674 * @param[in] sin Target address for connection.
675 * @return IOResult code indicating status.
677 IOResult os_connect_nonb(int fd, const struct irc_sockaddr* sin)
679 struct sockaddr_native addr;
682 size = sockaddr_from_irc(&addr, sin, fd);
683 if (connect(fd, (struct sockaddr*) &addr, size))
684 return (errno == EINPROGRESS) ? IO_BLOCKED : IO_FAILURE;
688 /** Get local address of a socket.
689 * @param[in] fd File descriptor to operate on.
690 * @param[out] sin_out Receives local socket address.
691 * @return Non-zero on success; zero on error.
693 int os_get_sockname(int fd, struct irc_sockaddr* sin_out)
695 struct sockaddr_native addr;
696 unsigned int len = sizeof(addr);
698 assert(0 != sin_out);
699 if (getsockname(fd, (struct sockaddr*) &addr, &len))
701 sockaddr_to_irc(&addr, sin_out);
705 /** Get remote address of a socket.
706 * @param[in] fd File descriptor to operate on.
707 * @param[out] sin_out Receives remote socket address.
708 * @return Non-zero on success; zero on error.
710 int os_get_peername(int fd, struct irc_sockaddr* sin_out)
712 struct sockaddr_native addr;
713 unsigned int len = sizeof(addr);
715 assert(0 != sin_out);
716 if (getpeername(fd, (struct sockaddr*) &addr, &len))
718 sockaddr_to_irc(&addr, sin_out);
722 /** Start listening on a socket.
723 * @param[in] fd Disconnected file descriptor.
724 * @param[in] backlog Maximum number of un-accept()ed connections to keep.
725 * @return Non-zero on success; zero on error.
727 int os_set_listen(int fd, int backlog)
729 return (0 == listen(fd, backlog));