1055 lines
21 KiB
C
Executable File
1055 lines
21 KiB
C
Executable File
/*
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* utils.c - various utility functions used in pppd.
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*
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* Copyright (c) 1999-2002 Paul Mackerras. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. The name(s) of the authors of this software must not be used to
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* endorse or promote products derived from this software without
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* prior written permission.
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*
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* 3. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by Paul Mackerras
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* <paulus@samba.org>".
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*
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* THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
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* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
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* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
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* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#define RCSID "$Id: //BBN_Linux/Branch/Branch_for_Rel_TP_ASEAN_20161216/tclinux_phoenix/apps/public/ppp-2.4.5/pppd/utils.c#1 $"
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#include <stdio.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <signal.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <syslog.h>
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#include <netdb.h>
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#include <time.h>
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#include <utmp.h>
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#include <pwd.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#ifdef SVR4
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#include <sys/mkdev.h>
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#endif
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#include "pppd.h"
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#include "fsm.h"
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#include "lcp.h"
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static const char rcsid[] = RCSID;
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#if defined(SUNOS4)
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extern char *strerror();
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#endif
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static void logit __P((int, char *, va_list));
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static void log_write __P((int, char *));
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static void vslp_printer __P((void *, char *, ...));
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static void format_packet __P((u_char *, int, void (*) (void *, char *, ...),
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void *));
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struct buffer_info {
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char *ptr;
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int len;
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};
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/*
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* strlcpy - like strcpy/strncpy, doesn't overflow destination buffer,
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* always leaves destination null-terminated (for len > 0).
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*/
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size_t
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strlcpy(dest, src, len)
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char *dest;
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const char *src;
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size_t len;
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{
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size_t ret = strlen(src);
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if (len != 0) {
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if (ret < len)
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strcpy(dest, src);
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else {
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strncpy(dest, src, len - 1);
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dest[len-1] = 0;
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}
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}
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return ret;
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}
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/*
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* strlcat - like strcat/strncat, doesn't overflow destination buffer,
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* always leaves destination null-terminated (for len > 0).
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*/
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size_t
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strlcat(dest, src, len)
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char *dest;
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const char *src;
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size_t len;
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{
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size_t dlen = strlen(dest);
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return dlen + strlcpy(dest + dlen, src, (len > dlen? len - dlen: 0));
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}
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/*
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* slprintf - format a message into a buffer. Like sprintf except we
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* also specify the length of the output buffer, and we handle
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* %m (error message), %v (visible string),
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* %q (quoted string), %t (current time) and %I (IP address) formats.
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* Doesn't do floating-point formats.
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* Returns the number of chars put into buf.
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*/
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int
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slprintf __V((char *buf, int buflen, char *fmt, ...))
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{
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va_list args;
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int n;
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#if defined(__STDC__)
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va_start(args, fmt);
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#else
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char *buf;
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int buflen;
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char *fmt;
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va_start(args);
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buf = va_arg(args, char *);
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buflen = va_arg(args, int);
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fmt = va_arg(args, char *);
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#endif
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n = vslprintf(buf, buflen, fmt, args);
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va_end(args);
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return n;
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}
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/*
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* vslprintf - like slprintf, takes a va_list instead of a list of args.
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*/
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#define OUTCHAR(c) (buflen > 0? (--buflen, *buf++ = (c)): 0)
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int
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vslprintf(buf, buflen, fmt, args)
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char *buf;
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int buflen;
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char *fmt;
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va_list args;
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{
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int c, i, n;
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int width, prec, fillch;
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int base, len, neg, quoted;
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unsigned long val = 0;
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char *str, *f, *buf0;
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unsigned char *p;
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char num[32];
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time_t t;
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u_int32_t ip;
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static char hexchars[] = "0123456789abcdef";
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struct buffer_info bufinfo;
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buf0 = buf;
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--buflen;
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while (buflen > 0) {
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for (f = fmt; *f != '%' && *f != 0; ++f)
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;
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if (f > fmt) {
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len = f - fmt;
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if (len > buflen)
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len = buflen;
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memcpy(buf, fmt, len);
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buf += len;
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buflen -= len;
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fmt = f;
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}
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if (*fmt == 0)
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break;
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c = *++fmt;
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width = 0;
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prec = -1;
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fillch = ' ';
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if (c == '0') {
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fillch = '0';
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c = *++fmt;
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}
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if (c == '*') {
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width = va_arg(args, int);
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c = *++fmt;
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} else {
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while (isdigit(c)) {
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width = width * 10 + c - '0';
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c = *++fmt;
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}
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}
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if (c == '.') {
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c = *++fmt;
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if (c == '*') {
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prec = va_arg(args, int);
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c = *++fmt;
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} else {
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prec = 0;
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while (isdigit(c)) {
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prec = prec * 10 + c - '0';
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c = *++fmt;
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}
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}
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}
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str = 0;
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base = 0;
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neg = 0;
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++fmt;
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switch (c) {
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case 'l':
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c = *fmt++;
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switch (c) {
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case 'd':
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val = va_arg(args, long);
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if (val < 0) {
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neg = 1;
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val = -val;
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}
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base = 10;
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break;
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case 'u':
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val = va_arg(args, unsigned long);
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base = 10;
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break;
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default:
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OUTCHAR('%');
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OUTCHAR('l');
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--fmt; /* so %lz outputs %lz etc. */
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continue;
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}
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break;
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case 'd':
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i = va_arg(args, int);
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if (i < 0) {
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neg = 1;
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val = -i;
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} else
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val = i;
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base = 10;
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break;
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case 'u':
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val = va_arg(args, unsigned int);
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base = 10;
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break;
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case 'o':
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val = va_arg(args, unsigned int);
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base = 8;
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break;
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case 'x':
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case 'X':
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val = va_arg(args, unsigned int);
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base = 16;
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break;
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case 'p':
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val = (unsigned long) va_arg(args, void *);
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base = 16;
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neg = 2;
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break;
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case 's':
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str = va_arg(args, char *);
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break;
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case 'c':
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num[0] = va_arg(args, int);
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num[1] = 0;
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str = num;
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break;
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case 'm':
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str = strerror(errno);
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break;
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case 'I':
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ip = va_arg(args, u_int32_t);
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ip = ntohl(ip);
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slprintf(num, sizeof(num), "%d.%d.%d.%d", (ip >> 24) & 0xff,
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(ip >> 16) & 0xff, (ip >> 8) & 0xff, ip & 0xff);
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str = num;
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break;
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#if 0 /* not used, and breaks on S/390, apparently */
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case 'r':
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f = va_arg(args, char *);
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#ifndef __powerpc__
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n = vslprintf(buf, buflen + 1, f, va_arg(args, va_list));
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#else
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/* On the powerpc, a va_list is an array of 1 structure */
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n = vslprintf(buf, buflen + 1, f, va_arg(args, void *));
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#endif
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buf += n;
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buflen -= n;
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continue;
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#endif
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case 't':
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time(&t);
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str = ctime(&t);
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str += 4; /* chop off the day name */
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str[15] = 0; /* chop off year and newline */
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break;
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case 'v': /* "visible" string */
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case 'q': /* quoted string */
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quoted = c == 'q';
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p = va_arg(args, unsigned char *);
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if (fillch == '0' && prec >= 0) {
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n = prec;
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} else {
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n = strlen((char *)p);
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if (prec >= 0 && n > prec)
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n = prec;
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}
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while (n > 0 && buflen > 0) {
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c = *p++;
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--n;
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if (!quoted && c >= 0x80) {
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OUTCHAR('M');
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OUTCHAR('-');
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c -= 0x80;
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}
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if (quoted && (c == '"' || c == '\\'))
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OUTCHAR('\\');
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if (c < 0x20 || (0x7f <= c && c < 0xa0)) {
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if (quoted) {
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OUTCHAR('\\');
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switch (c) {
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case '\t': OUTCHAR('t'); break;
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case '\n': OUTCHAR('n'); break;
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case '\b': OUTCHAR('b'); break;
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case '\f': OUTCHAR('f'); break;
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default:
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OUTCHAR('x');
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OUTCHAR(hexchars[c >> 4]);
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OUTCHAR(hexchars[c & 0xf]);
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}
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} else {
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if (c == '\t')
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OUTCHAR(c);
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else {
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OUTCHAR('^');
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OUTCHAR(c ^ 0x40);
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}
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}
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} else
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OUTCHAR(c);
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}
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continue;
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case 'P': /* print PPP packet */
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bufinfo.ptr = buf;
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bufinfo.len = buflen + 1;
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p = va_arg(args, unsigned char *);
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n = va_arg(args, int);
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format_packet(p, n, vslp_printer, &bufinfo);
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buf = bufinfo.ptr;
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buflen = bufinfo.len - 1;
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continue;
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case 'B':
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p = va_arg(args, unsigned char *);
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for (n = prec; n > 0; --n) {
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c = *p++;
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if (fillch == ' ')
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OUTCHAR(' ');
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OUTCHAR(hexchars[(c >> 4) & 0xf]);
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OUTCHAR(hexchars[c & 0xf]);
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}
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continue;
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default:
|
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*buf++ = '%';
|
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if (c != '%')
|
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--fmt; /* so %z outputs %z etc. */
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--buflen;
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|
continue;
|
|
}
|
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if (base != 0) {
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str = num + sizeof(num);
|
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*--str = 0;
|
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while (str > num + neg) {
|
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*--str = hexchars[val % base];
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val = val / base;
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if (--prec <= 0 && val == 0)
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break;
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|
}
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switch (neg) {
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case 1:
|
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*--str = '-';
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break;
|
|
case 2:
|
|
*--str = 'x';
|
|
*--str = '0';
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break;
|
|
}
|
|
len = num + sizeof(num) - 1 - str;
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} else {
|
|
len = strlen(str);
|
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if (prec >= 0 && len > prec)
|
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len = prec;
|
|
}
|
|
if (width > 0) {
|
|
if (width > buflen)
|
|
width = buflen;
|
|
if ((n = width - len) > 0) {
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buflen -= n;
|
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for (; n > 0; --n)
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*buf++ = fillch;
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}
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}
|
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if (len > buflen)
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len = buflen;
|
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memcpy(buf, str, len);
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buf += len;
|
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buflen -= len;
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}
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|
*buf = 0;
|
|
return buf - buf0;
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}
|
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|
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/*
|
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* vslp_printer - used in processing a %P format
|
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*/
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static void
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vslp_printer __V((void *arg, char *fmt, ...))
|
|
{
|
|
int n;
|
|
va_list pvar;
|
|
struct buffer_info *bi;
|
|
|
|
#if defined(__STDC__)
|
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va_start(pvar, fmt);
|
|
#else
|
|
void *arg;
|
|
char *fmt;
|
|
va_start(pvar);
|
|
arg = va_arg(pvar, void *);
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fmt = va_arg(pvar, char *);
|
|
#endif
|
|
|
|
bi = (struct buffer_info *) arg;
|
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n = vslprintf(bi->ptr, bi->len, fmt, pvar);
|
|
va_end(pvar);
|
|
|
|
bi->ptr += n;
|
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bi->len -= n;
|
|
}
|
|
|
|
#ifdef unused
|
|
/*
|
|
* log_packet - format a packet and log it.
|
|
*/
|
|
|
|
void
|
|
log_packet(p, len, prefix, level)
|
|
u_char *p;
|
|
int len;
|
|
char *prefix;
|
|
int level;
|
|
{
|
|
init_pr_log(prefix, level);
|
|
format_packet(p, len, pr_log, &level);
|
|
end_pr_log();
|
|
}
|
|
#endif /* unused */
|
|
|
|
/*
|
|
* format_packet - make a readable representation of a packet,
|
|
* calling `printer(arg, format, ...)' to output it.
|
|
*/
|
|
static void
|
|
format_packet(p, len, printer, arg)
|
|
u_char *p;
|
|
int len;
|
|
void (*printer) __P((void *, char *, ...));
|
|
void *arg;
|
|
{
|
|
int i, n;
|
|
u_short proto;
|
|
struct protent *protp;
|
|
|
|
if (len >= PPP_HDRLEN && p[0] == PPP_ALLSTATIONS && p[1] == PPP_UI) {
|
|
p += 2;
|
|
GETSHORT(proto, p);
|
|
len -= PPP_HDRLEN;
|
|
for (i = 0; (protp = protocols[i]) != NULL; ++i)
|
|
if (proto == protp->protocol)
|
|
break;
|
|
if (protp != NULL) {
|
|
printer(arg, "[%s", protp->name);
|
|
n = (*protp->printpkt)(p, len, printer, arg);
|
|
printer(arg, "]");
|
|
p += n;
|
|
len -= n;
|
|
} else {
|
|
for (i = 0; (protp = protocols[i]) != NULL; ++i)
|
|
if (proto == (protp->protocol & ~0x8000))
|
|
break;
|
|
if (protp != 0 && protp->data_name != 0) {
|
|
printer(arg, "[%s data]", protp->data_name);
|
|
if (len > 8)
|
|
printer(arg, "%.8B ...", p);
|
|
else
|
|
printer(arg, "%.*B", len, p);
|
|
len = 0;
|
|
} else
|
|
printer(arg, "[proto=0x%x]", proto);
|
|
}
|
|
}
|
|
|
|
if (len > 32)
|
|
printer(arg, "%.32B ...", p);
|
|
else
|
|
printer(arg, "%.*B", len, p);
|
|
}
|
|
|
|
/*
|
|
* init_pr_log, end_pr_log - initialize and finish use of pr_log.
|
|
*/
|
|
|
|
static char line[256]; /* line to be logged accumulated here */
|
|
static char *linep; /* current pointer within line */
|
|
static int llevel; /* level for logging */
|
|
|
|
void
|
|
init_pr_log(prefix, level)
|
|
const char *prefix;
|
|
int level;
|
|
{
|
|
linep = line;
|
|
if (prefix != NULL) {
|
|
strlcpy(line, prefix, sizeof(line));
|
|
linep = line + strlen(line);
|
|
}
|
|
llevel = level;
|
|
}
|
|
|
|
void
|
|
end_pr_log()
|
|
{
|
|
if (linep != line) {
|
|
*linep = 0;
|
|
log_write(llevel, line);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* pr_log - printer routine for outputting to syslog
|
|
*/
|
|
void
|
|
pr_log __V((void *arg, char *fmt, ...))
|
|
{
|
|
int l, n;
|
|
va_list pvar;
|
|
char *p, *eol;
|
|
char buf[256];
|
|
|
|
#if defined(__STDC__)
|
|
va_start(pvar, fmt);
|
|
#else
|
|
void *arg;
|
|
char *fmt;
|
|
va_start(pvar);
|
|
arg = va_arg(pvar, void *);
|
|
fmt = va_arg(pvar, char *);
|
|
#endif
|
|
|
|
n = vslprintf(buf, sizeof(buf), fmt, pvar);
|
|
va_end(pvar);
|
|
|
|
p = buf;
|
|
eol = strchr(buf, '\n');
|
|
if (linep != line) {
|
|
l = (eol == NULL)? n: eol - buf;
|
|
if (linep + l < line + sizeof(line)) {
|
|
if (l > 0) {
|
|
memcpy(linep, buf, l);
|
|
linep += l;
|
|
}
|
|
if (eol == NULL)
|
|
return;
|
|
p = eol + 1;
|
|
eol = strchr(p, '\n');
|
|
}
|
|
*linep = 0;
|
|
log_write(llevel, line);
|
|
linep = line;
|
|
}
|
|
|
|
while (eol != NULL) {
|
|
*eol = 0;
|
|
log_write(llevel, p);
|
|
p = eol + 1;
|
|
eol = strchr(p, '\n');
|
|
}
|
|
|
|
/* assumes sizeof(buf) <= sizeof(line) */
|
|
l = buf + n - p;
|
|
if (l > 0) {
|
|
memcpy(line, p, n);
|
|
linep = line + l;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* print_string - print a readable representation of a string using
|
|
* printer.
|
|
*/
|
|
void
|
|
print_string(p, len, printer, arg)
|
|
char *p;
|
|
int len;
|
|
void (*printer) __P((void *, char *, ...));
|
|
void *arg;
|
|
{
|
|
int c;
|
|
|
|
printer(arg, "\"");
|
|
for (; len > 0; --len) {
|
|
c = *p++;
|
|
if (' ' <= c && c <= '~') {
|
|
if (c == '\\' || c == '"')
|
|
printer(arg, "\\");
|
|
printer(arg, "%c", c);
|
|
} else {
|
|
switch (c) {
|
|
case '\n':
|
|
printer(arg, "\\n");
|
|
break;
|
|
case '\r':
|
|
printer(arg, "\\r");
|
|
break;
|
|
case '\t':
|
|
printer(arg, "\\t");
|
|
break;
|
|
default:
|
|
printer(arg, "\\%.3o", c);
|
|
}
|
|
}
|
|
}
|
|
printer(arg, "\"");
|
|
}
|
|
|
|
/*
|
|
* logit - does the hard work for fatal et al.
|
|
*/
|
|
static void
|
|
logit(level, fmt, args)
|
|
int level;
|
|
char *fmt;
|
|
va_list args;
|
|
{
|
|
int n;
|
|
char buf[1024];
|
|
|
|
n = vslprintf(buf, sizeof(buf), fmt, args);
|
|
log_write(level, buf);
|
|
}
|
|
|
|
static void
|
|
log_write(level, buf)
|
|
int level;
|
|
char *buf;
|
|
{
|
|
syslog(level, "%s", buf);
|
|
if (log_to_fd >= 0 && (level != LOG_DEBUG || debug)) {
|
|
int n = strlen(buf);
|
|
|
|
if (n > 0 && buf[n-1] == '\n')
|
|
--n;
|
|
if (write(log_to_fd, buf, n) != n
|
|
|| write(log_to_fd, "\n", 1) != 1)
|
|
log_to_fd = -1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* fatal - log an error message and die horribly.
|
|
*/
|
|
void
|
|
fatal __V((char *fmt, ...))
|
|
{
|
|
va_list pvar;
|
|
|
|
#if defined(__STDC__)
|
|
va_start(pvar, fmt);
|
|
#else
|
|
char *fmt;
|
|
va_start(pvar);
|
|
fmt = va_arg(pvar, char *);
|
|
#endif
|
|
|
|
logit(LOG_ERR, fmt, pvar);
|
|
va_end(pvar);
|
|
|
|
die(1); /* as promised */
|
|
}
|
|
|
|
/*
|
|
* error - log an error message.
|
|
*/
|
|
void
|
|
error __V((char *fmt, ...))
|
|
{
|
|
va_list pvar;
|
|
|
|
#if defined(__STDC__)
|
|
va_start(pvar, fmt);
|
|
#else
|
|
char *fmt;
|
|
va_start(pvar);
|
|
fmt = va_arg(pvar, char *);
|
|
#endif
|
|
|
|
logit(LOG_ERR, fmt, pvar);
|
|
va_end(pvar);
|
|
++error_count;
|
|
}
|
|
|
|
/*
|
|
* warn - log a warning message.
|
|
*/
|
|
void
|
|
warn __V((char *fmt, ...))
|
|
{
|
|
va_list pvar;
|
|
|
|
#if defined(__STDC__)
|
|
va_start(pvar, fmt);
|
|
#else
|
|
char *fmt;
|
|
va_start(pvar);
|
|
fmt = va_arg(pvar, char *);
|
|
#endif
|
|
|
|
logit(LOG_WARNING, fmt, pvar);
|
|
va_end(pvar);
|
|
}
|
|
|
|
/*
|
|
* notice - log a notice-level message.
|
|
*/
|
|
void
|
|
notice __V((char *fmt, ...))
|
|
{
|
|
va_list pvar;
|
|
|
|
#if defined(__STDC__)
|
|
va_start(pvar, fmt);
|
|
#else
|
|
char *fmt;
|
|
va_start(pvar);
|
|
fmt = va_arg(pvar, char *);
|
|
#endif
|
|
|
|
logit(LOG_NOTICE, fmt, pvar);
|
|
va_end(pvar);
|
|
}
|
|
|
|
/*
|
|
* info - log an informational message.
|
|
*/
|
|
void
|
|
info __V((char *fmt, ...))
|
|
{
|
|
va_list pvar;
|
|
|
|
#if defined(__STDC__)
|
|
va_start(pvar, fmt);
|
|
#else
|
|
char *fmt;
|
|
va_start(pvar);
|
|
fmt = va_arg(pvar, char *);
|
|
#endif
|
|
|
|
logit(LOG_INFO, fmt, pvar);
|
|
va_end(pvar);
|
|
}
|
|
|
|
/*
|
|
* dbglog - log a debug message.
|
|
*/
|
|
void
|
|
dbglog __V((char *fmt, ...))
|
|
{
|
|
va_list pvar;
|
|
|
|
#if defined(__STDC__)
|
|
va_start(pvar, fmt);
|
|
#else
|
|
char *fmt;
|
|
va_start(pvar);
|
|
fmt = va_arg(pvar, char *);
|
|
#endif
|
|
|
|
logit(LOG_DEBUG, fmt, pvar);
|
|
va_end(pvar);
|
|
}
|
|
|
|
/*
|
|
* dump_packet - print out a packet in readable form if it is interesting.
|
|
* Assumes len >= PPP_HDRLEN.
|
|
*/
|
|
void
|
|
dump_packet(const char *tag, unsigned char *p, int len)
|
|
{
|
|
int proto;
|
|
|
|
if (!debug)
|
|
return;
|
|
|
|
/*
|
|
* don't print LCP echo request/reply packets if debug <= 1
|
|
* and the link is up.
|
|
*/
|
|
proto = (p[2] << 8) + p[3];
|
|
if (debug <= 1 && unsuccess == 0 && proto == PPP_LCP
|
|
&& len >= PPP_HDRLEN + HEADERLEN) {
|
|
unsigned char *lcp = p + PPP_HDRLEN;
|
|
int l = (lcp[2] << 8) + lcp[3];
|
|
|
|
if ((lcp[0] == ECHOREQ || lcp[0] == ECHOREP)
|
|
&& l >= HEADERLEN && l <= len - PPP_HDRLEN)
|
|
return;
|
|
}
|
|
|
|
dbglog("%s %P", tag, p, len);
|
|
}
|
|
|
|
/*
|
|
* complete_read - read a full `count' bytes from fd,
|
|
* unless end-of-file or an error other than EINTR is encountered.
|
|
*/
|
|
ssize_t
|
|
complete_read(int fd, void *buf, size_t count)
|
|
{
|
|
size_t done;
|
|
ssize_t nb;
|
|
char *ptr = buf;
|
|
|
|
for (done = 0; done < count; ) {
|
|
nb = read(fd, ptr, count - done);
|
|
if (nb < 0) {
|
|
if (errno == EINTR)
|
|
continue;
|
|
return -1;
|
|
}
|
|
if (nb == 0)
|
|
break;
|
|
done += nb;
|
|
ptr += nb;
|
|
}
|
|
return done;
|
|
}
|
|
|
|
/* Procedures for locking the serial device using a lock file. */
|
|
#ifndef LOCK_DIR
|
|
#ifdef __linux__
|
|
#define LOCK_DIR "/var/lock"
|
|
#else
|
|
#ifdef SVR4
|
|
#define LOCK_DIR "/var/spool/locks"
|
|
#else
|
|
#define LOCK_DIR "/var/spool/lock"
|
|
#endif
|
|
#endif
|
|
#endif /* LOCK_DIR */
|
|
|
|
static char lock_file[MAXPATHLEN];
|
|
|
|
/*
|
|
* lock - create a lock file for the named device
|
|
*/
|
|
int
|
|
lock(dev)
|
|
char *dev;
|
|
{
|
|
#ifdef LOCKLIB
|
|
int result;
|
|
|
|
result = mklock (dev, (void *) 0);
|
|
if (result == 0) {
|
|
strlcpy(lock_file, dev, sizeof(lock_file));
|
|
return 0;
|
|
}
|
|
|
|
if (result > 0)
|
|
notice("Device %s is locked by pid %d", dev, result);
|
|
else
|
|
error("Can't create lock file %s", lock_file);
|
|
return -1;
|
|
|
|
#else /* LOCKLIB */
|
|
|
|
char lock_buffer[12];
|
|
int fd, pid, n;
|
|
|
|
#ifdef SVR4
|
|
struct stat sbuf;
|
|
|
|
if (stat(dev, &sbuf) < 0) {
|
|
error("Can't get device number for %s: %m", dev);
|
|
return -1;
|
|
}
|
|
if ((sbuf.st_mode & S_IFMT) != S_IFCHR) {
|
|
error("Can't lock %s: not a character device", dev);
|
|
return -1;
|
|
}
|
|
slprintf(lock_file, sizeof(lock_file), "%s/LK.%03d.%03d.%03d",
|
|
LOCK_DIR, major(sbuf.st_dev),
|
|
major(sbuf.st_rdev), minor(sbuf.st_rdev));
|
|
#else
|
|
char *p;
|
|
char lockdev[MAXPATHLEN];
|
|
|
|
if ((p = strstr(dev, "dev/")) != NULL) {
|
|
dev = p + 4;
|
|
strncpy(lockdev, dev, MAXPATHLEN-1);
|
|
lockdev[MAXPATHLEN-1] = 0;
|
|
while ((p = strrchr(lockdev, '/')) != NULL) {
|
|
*p = '_';
|
|
}
|
|
dev = lockdev;
|
|
} else
|
|
if ((p = strrchr(dev, '/')) != NULL)
|
|
dev = p + 1;
|
|
|
|
slprintf(lock_file, sizeof(lock_file), "%s/LCK..%s", LOCK_DIR, dev);
|
|
#endif
|
|
|
|
while ((fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644)) < 0) {
|
|
if (errno != EEXIST) {
|
|
error("Can't create lock file %s: %m", lock_file);
|
|
break;
|
|
}
|
|
|
|
/* Read the lock file to find out who has the device locked. */
|
|
fd = open(lock_file, O_RDONLY, 0);
|
|
if (fd < 0) {
|
|
if (errno == ENOENT) /* This is just a timing problem. */
|
|
continue;
|
|
error("Can't open existing lock file %s: %m", lock_file);
|
|
break;
|
|
}
|
|
#ifndef LOCK_BINARY
|
|
n = read(fd, lock_buffer, 11);
|
|
#else
|
|
n = read(fd, &pid, sizeof(pid));
|
|
#endif /* LOCK_BINARY */
|
|
close(fd);
|
|
fd = -1;
|
|
if (n <= 0) {
|
|
error("Can't read pid from lock file %s", lock_file);
|
|
break;
|
|
}
|
|
|
|
/* See if the process still exists. */
|
|
#ifndef LOCK_BINARY
|
|
lock_buffer[n] = 0;
|
|
pid = atoi(lock_buffer);
|
|
#endif /* LOCK_BINARY */
|
|
if (pid == getpid())
|
|
return 1; /* somebody else locked it for us */
|
|
if (pid == 0
|
|
|| (kill(pid, 0) == -1 && errno == ESRCH)) {
|
|
if (unlink (lock_file) == 0) {
|
|
notice("Removed stale lock on %s (pid %d)", dev, pid);
|
|
continue;
|
|
}
|
|
warn("Couldn't remove stale lock on %s", dev);
|
|
} else
|
|
notice("Device %s is locked by pid %d", dev, pid);
|
|
break;
|
|
}
|
|
|
|
if (fd < 0) {
|
|
lock_file[0] = 0;
|
|
return -1;
|
|
}
|
|
|
|
pid = getpid();
|
|
#ifndef LOCK_BINARY
|
|
slprintf(lock_buffer, sizeof(lock_buffer), "%10d\n", pid);
|
|
write (fd, lock_buffer, 11);
|
|
#else
|
|
write(fd, &pid, sizeof (pid));
|
|
#endif
|
|
close(fd);
|
|
return 0;
|
|
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* relock - called to update our lockfile when we are about to detach,
|
|
* thus changing our pid (we fork, the child carries on, and the parent dies).
|
|
* Note that this is called by the parent, with pid equal to the pid
|
|
* of the child. This avoids a potential race which would exist if
|
|
* we had the child rewrite the lockfile (the parent might die first,
|
|
* and another process could think the lock was stale if it checked
|
|
* between when the parent died and the child rewrote the lockfile).
|
|
*/
|
|
int
|
|
relock(pid)
|
|
int pid;
|
|
{
|
|
#ifdef LOCKLIB
|
|
/* XXX is there a way to do this? */
|
|
return -1;
|
|
#else /* LOCKLIB */
|
|
|
|
int fd;
|
|
char lock_buffer[12];
|
|
|
|
if (lock_file[0] == 0)
|
|
return -1;
|
|
fd = open(lock_file, O_WRONLY, 0);
|
|
if (fd < 0) {
|
|
error("Couldn't reopen lock file %s: %m", lock_file);
|
|
lock_file[0] = 0;
|
|
return -1;
|
|
}
|
|
|
|
#ifndef LOCK_BINARY
|
|
slprintf(lock_buffer, sizeof(lock_buffer), "%10d\n", pid);
|
|
write (fd, lock_buffer, 11);
|
|
#else
|
|
write(fd, &pid, sizeof(pid));
|
|
#endif /* LOCK_BINARY */
|
|
close(fd);
|
|
return 0;
|
|
|
|
#endif /* LOCKLIB */
|
|
}
|
|
|
|
/*
|
|
* unlock - remove our lockfile
|
|
*/
|
|
void
|
|
unlock()
|
|
{
|
|
if (lock_file[0]) {
|
|
#ifdef LOCKLIB
|
|
(void) rmlock(lock_file, (void *) 0);
|
|
#else
|
|
unlink(lock_file);
|
|
#endif
|
|
lock_file[0] = 0;
|
|
}
|
|
}
|
|
|