/* * misc os utilities */ /* Copyright 1990, 1991, 1998 The Open Group Permission to use, copy, modify, distribute, and sell this software and its documentation for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation. The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Except as contained in this notice, the name of The Open Group shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from The Open Group. * Copyright 1990, 1991 Network Computing Devices; * Portions Copyright 1987 by Digital Equipment Corporation * * Permission to use, copy, modify, distribute, and sell this software and * its documentation for any purpose is hereby granted without fee, provided * that the above copyright notice appear in all copies and that both that * copyright notice and this permission notice appear in supporting * documentation, and that the names of Network Computing Devices, or Digital * not be used in advertising or publicity pertaining to distribution * of the software without specific, written prior permission. * * NETWORK COMPUTING DEVICES, AND DIGITAL DISCLAIM ALL WARRANTIES WITH * REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL NETWORK COMPUTING DEVICES, * OR DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF * THIS SOFTWARE. */ #include "config.h" #include #include #include #include "misc.h" #include "globals.h" #include #include #include #include #include #include #include #include #include #include "osdep.h" #include static Bool dropPriv = FALSE; /* whether or not to drop root privileges */ #ifdef DEFAULT_DAEMON static Bool becomeDaemon = TRUE; /* whether to become a daemon or not */ #else static Bool becomeDaemon = FALSE; /* whether to become a daemon or not */ #endif #ifdef XFS_INETD static Bool runFromInetd = FALSE; /* whether we were run from inetd or not */ #endif static const char *userId = NULL; char *progname; Bool CloneSelf; Bool portFromCmdline = FALSE; OldListenRec *OldListen = NULL; int OldListenCount = 0; #ifndef STDERR_FILENO # define STDERR_FILENO fileno(stderr) #endif #define WRITES(s) write(STDERR_FILENO, s, strlen(s)) static const char *pidFile = XFSPIDDIR "/xfs.pid"; static int pidFd; static FILE *pidFilePtr; static int StorePid (void); /* ARGSUSED */ void AutoResetServer(int n) { int olderrno = errno; #ifdef DEBUG WRITES("got a reset signal\n"); #endif dispatchException |= DE_RESET; isItTimeToYield = TRUE; errno = olderrno; } /* ARGSUSED */ void GiveUp(int n) { int olderrno = errno; #ifdef DEBUG WRITES("got a TERM signal\n"); #endif dispatchException |= DE_TERMINATE; isItTimeToYield = TRUE; errno = olderrno; } /* ARGSUSED */ void ServerReconfig(int n) { int olderrno = errno; #ifdef DEBUG WRITES("got a re-config signal\n"); #endif dispatchException |= DE_RECONFIG; isItTimeToYield = TRUE; errno = olderrno; } /* ARGSUSED */ void ServerCacheFlush(int n) { int olderrno = errno; #ifdef DEBUG WRITES("got a flush signal\n"); #endif dispatchException |= DE_FLUSH; isItTimeToYield = TRUE; errno = olderrno; } /* ARGSUSED */ void CleanupChild(int n) { int olderrno = errno; pid_t child; #ifdef DEBUG WRITES("got a child signal\n"); #endif while ( (child = waitpid((pid_t)-1, NULL, WNOHANG)) > 0 ) { #ifdef DEBUG char msgbuf[64]; snprintf(msgbuf, sizeof(msgbuf), " child %d exited\n", child); WRITES(msgbuf); #endif } errno = olderrno; } unsigned int GetTimeInMillis(void) { struct timeval tp; X_GETTIMEOFDAY(&tp); return ((tp.tv_sec * 1000) + (tp.tv_usec / 1000)); } static void _X_NORETURN usage(const char *errmsg) { if (errmsg != NULL) fprintf (stderr, "%s: %s\n", progname, errmsg); fprintf(stderr, "usage: %s [-config config_file] [-port tcp_port] [-droppriv] [-daemon] [-nodaemon] [-user user_name] [-ls listen_socket]\n" " %s [-version]\n", progname, progname); exit(1); } /* * The '-ls' option is used for cloning the font server. * * We expect a single string of the form... * * transport_id/fd/portnum[,transport_id/fd/portnum]... * * [] denotes optional and ... denotes repetition. * * The string must be _exactly_ in the above format. */ void ProcessLSoption (char *str) { char *ptr = str; char *slash; char number[20]; int count = 0; int len, i; if ((OldListenCount != 0) || (OldListen != NULL)) { FatalError("-ls may only be specified once\n"); } while (*ptr != '\0') { if (*ptr == ',') count++; ptr++; } OldListenCount = count + 1; OldListen = (OldListenRec *) malloc ( OldListenCount * sizeof (OldListenRec)); if (OldListen == NULL) { fprintf(stderr, "ProcessLSoption: malloc error\n"); exit(1); } ptr = str; for (i = 0; i < OldListenCount; i++) { slash = (char *) strchr (ptr, '/'); if (slash == NULL) { usage("invalid argument for -ls"); } len = slash - ptr; strncpy (number, ptr, len); number[len] = '\0'; OldListen[i].trans_id = atoi (number); ptr = slash + 1; slash = (char *) strchr (ptr, '/'); if (slash == NULL) { usage("invalid argument for -ls"); } len = slash - ptr; strncpy (number, ptr, len); number[len] = '\0'; OldListen[i].fd = atoi (number); ptr = slash + 1; if (i == OldListenCount - 1) OldListen[i].portnum = atoi (ptr); else { char *comma = (char *) strchr (ptr, ','); if (comma == NULL) { usage("invalid argument for -ls"); } len = comma - ptr; strncpy (number, ptr, len); number[len] = '\0'; OldListen[i].portnum = atoi (number); ptr = comma + 1; } } } /* ARGSUSED */ void ProcessCmdLine(int argc, char **argv) { int i; progname = argv[0]; for (i = 1; i < argc; i++) { if (!strcmp(argv[i], "-port")) { if (argv[i + 1]) { ListenPort = atoi(argv[++i]); portFromCmdline = TRUE; } else usage("-port requires an argument"); } else if (!strcmp(argv[i], "-ls")) { if (argv[i + 1]) ProcessLSoption (argv[++i]); else usage("-ls requires an argument"); } else if (!strcmp(argv[i], "-droppriv")) { dropPriv = TRUE; } else if (!strcmp(argv[i], "-daemon")) { becomeDaemon = TRUE; } else if (!strcmp(argv[i], "-nodaemon")) { becomeDaemon = FALSE; } else if (!strcmp(argv[i], "-inetd")) { #ifdef XFS_INETD runFromInetd = TRUE; #else FatalError("-inetd specified, but xfs was not built" " with inetd support\n"); #endif } else if (!strcmp(argv[i], "-user")) { if (argv[i + 1]) userId = argv[++i]; else usage("-user requires an argument"); } else if (!strcmp(argv[i], "-cf") || !strcmp(argv[i], "-config")) { if (argv[i + 1]) configfilename = argv[++i]; else usage("-config requires an argument"); } else if (!strcmp(argv[i], "-version")) { puts(PACKAGE_STRING); exit(0); } else { fprintf (stderr, "%s: unrecognized option %s\n", progname, argv[i]); usage(NULL); } } } #ifndef SPECIAL_MALLOC unsigned long Must_have_memory; /* FSalloc -- FS's internal memory allocator. Why does it return unsigned * int * instead of the more common char *? Well, if you read K&R you'll * see they say that alloc must return a pointer "suitable for conversion" * to whatever type you really want. In a full-blown generic allocator * there's no way to solve the alignment problems without potentially * wasting lots of space. But we have a more limited problem. We know * we're only ever returning pointers to structures which will have to * be long word aligned. So we are making a stronger guarantee. It might * have made sense to make FSalloc return char * to conform with people's * expectations of malloc, but this makes lint happier. */ pointer FSalloc (unsigned long amount) { register pointer ptr; if ((long)amount < 0) return 0; if (amount == 0) amount++; /* aligned extra on long word boundary */ amount = (amount + 3) & ~3; if ((ptr = (pointer)malloc(amount)) != 0) return ptr; if (Must_have_memory) FatalError("out of memory\n"); return 0; } /* FSallocarray: Array allocation with overflow check */ pointer FSallocarray (unsigned long num, unsigned long size) { if (num != 0 && size != 0) { if (size > (SIZE_MAX / num)) { return NULL; } } return FSalloc(num * size); } /***************** * FScalloc *****************/ pointer FScalloc (unsigned long num, unsigned long size) { pointer ret; ret = FSallocarray(num, size); if (ret) memset (ret, 0, num * size); return ret; } /***************** * FSrealloc *****************/ pointer FSrealloc (pointer ptr, unsigned long amount) { if ((long)amount <= 0) { if (ptr && !amount) free(ptr); return 0; } amount = (amount + 3) & ~3; if (ptr) ptr = (pointer)realloc((char *)ptr, amount); else ptr = (pointer)malloc(amount); if (ptr) return ptr; if (Must_have_memory) FatalError("out of memory\n"); return 0; } /* FSreallocarray: Array reallocation with overflow check */ pointer FSreallocarray (pointer ptr, unsigned long num, unsigned long size) { if (num != 0 && size != 0) { if (size > (SIZE_MAX / num)) { return NULL; } } return FSrealloc(ptr, num * size); } /***************** * FSfree * calls free *****************/ void FSfree(pointer ptr) { if (ptr) free((char *)ptr); } #endif /* SPECIAL_MALLOC */ void SetUserId(void) { /* become xfs user (or other specified on command line) if possible */ if ((geteuid() == 0) && (dropPriv || userId)) { const char *user; struct passwd *pwent; if (!userId) user = "xfs"; else user = userId; pwent = getpwnam(user); if (pwent) { if (setgid(pwent->pw_gid)) { FatalError("fatal: couldn't set groupid to xfs user's group\n"); } #ifndef __CYGWIN__ if (setgroups(0, NULL)) { FatalError("fatal: couldn't drop supplementary groups\n"); } #endif if (initgroups(user, pwent->pw_gid)) { FatalError("fatal: couldn't init supplementary groups\n"); } if (setuid(pwent->pw_uid)) { FatalError("fatal: couldn't set userid to %s user\n", user); } } } else if (dropPriv || userId) { FatalError("fatal: -droppriv or -user flag specified, but xfs not run as root\n"); } } void SetDaemonState(void) { int oldpid; #ifdef XFS_INETD if (runFromInetd) { int inetdListener; /* fd's 0, 1, & 2 are the initial listen socket provided by inetd, * so dup it and then clear them so stdin/out/err aren't in use. */ inetdListener = dup(0); if (inetdListener == -1) { FatalError("failed to dup inetd socket: %s\n", strerror(errno)); } DetachStdio(); /* Setup & pass the inetd socket back through the connection setup * code the same way as a cloned listening port */ OldListenCount = 1; OldListen = _FontTransGetInetdListenInfo (inetdListener); if (OldListen == NULL) { FatalError("failed to initialize OldListen to inetd socket: %s\n", strerror(errno)); } ListenPort = OldListen[0].portnum; NoticeF("accepting listener from inetd on fd %d, port %d\n", inetdListener, ListenPort); return; } #endif /* XFS_INETD */ if (becomeDaemon) { BecomeDaemon(); if ((oldpid = StorePid ())) { if (oldpid == -1) ErrorF ("error opening process-id file %s\n", pidFile); else ErrorF ("process-id file %s indicates another xfs is " "running (pid %d); exiting\n", pidFile, oldpid); exit(1); } } } static int StorePid (void) { int oldpid; if (pidFile[0] != '\0') { pidFd = open (pidFile, O_RDWR); if (pidFd == -1 && errno == ENOENT) pidFd = open (pidFile, O_RDWR|O_CREAT, 0666); if (pidFd == -1 || !(pidFilePtr = fdopen (pidFd, "r+"))) { ErrorF ("cannot open process-id file %s: %s\n", pidFile, strerror (errno)); return -1; } if (fscanf (pidFilePtr, "%d\n", &oldpid) != 1) oldpid = -1; if (fseek (pidFilePtr, 0L, SEEK_SET) == -1) { ErrorF ("cannot seek process-id file %s: %s\n", pidFile, strerror (errno)); return -1; } if (fprintf (pidFilePtr, "%11ld\n", (long) getpid ()) != 12) { ErrorF ("cannot write to process-id file %s: %s\n", pidFile, strerror (errno)); return -1; } (void) fflush (pidFilePtr); (void) fclose (pidFilePtr); } return 0; } static const unsigned char _reverse_byte[0x100] = { 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0, 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0, 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8, 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8, 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4, 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4, 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec, 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc, 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2, 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2, 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea, 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa, 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6, 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6, 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee, 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe, 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1, 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1, 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9, 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9, 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5, 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5, 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed, 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd, 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3, 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3, 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb, 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb, 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7, 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7, 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef, 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff }; /* * Invert bit order within each BYTE of an array. */ void BitOrderInvert(unsigned char *buf, int nbytes) { const unsigned char *rev = _reverse_byte; for (; --nbytes >= 0; buf++) *buf = rev[*buf]; } /* * Invert byte order within each 16-bits of an array. */ void TwoByteSwap(unsigned char *buf, int nbytes) { unsigned char c; for (; nbytes > 0; nbytes -= 2, buf += 2) { c = buf[0]; buf[0] = buf[1]; buf[1] = c; } } /* * Invert byte order within each 32-bits of an array. */ void FourByteSwap(unsigned char *buf, int nbytes) { unsigned char c; for (; nbytes > 0; nbytes -= 4, buf += 4) { c = buf[0]; buf[0] = buf[3]; buf[3] = c; c = buf[1]; buf[1] = buf[2]; buf[2] = c; } }