BadVPN – Rev 1
?pathlinks?
/*
* utils.c - various utility functions used in pppd.
*
* Copyright (c) 1999-2002 Paul Mackerras. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. The name(s) of the authors of this software must not be used to
* endorse or promote products derived from this software without
* prior written permission.
*
* 3. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Paul Mackerras
* <paulus@samba.org>".
*
* THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL THE AUTHORS 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 "netif/ppp/ppp_opts.h"
#if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
#if 0 /* UNUSED */
#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <fcntl.h>
#include <syslog.h>
#include <netdb.h>
#include <time.h>
#include <utmp.h>
#include <pwd.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
#ifdef SVR4
#include <sys/mkdev.h>
#endif
#endif /* UNUSED */
#include <ctype.h> /* isdigit() */
#include "netif/ppp/ppp_impl.h"
#include "netif/ppp/fsm.h"
#include "netif/ppp/lcp.h"
#if defined(SUNOS4)
extern char *strerror();
#endif
static void ppp_logit(int level, const char *fmt, va_list args);
static void ppp_log_write(int level, char *buf);
#if PRINTPKT_SUPPORT
static void ppp_vslp_printer(void *arg, const char *fmt, ...);
static void ppp_format_packet(const u_char *p, int len,
void (*printer) (void *, const char *, ...), void *arg);
struct buffer_info {
char *ptr;
int len;
};
#endif /* PRINTPKT_SUPPORT */
/*
* ppp_strlcpy - like strcpy/strncpy, doesn't overflow destination buffer,
* always leaves destination null-terminated (for len > 0).
*/
size_t ppp_strlcpy(char *dest, const char *src, size_t len) {
size_t ret = strlen(src);
if (len != 0) {
if (ret < len)
strcpy(dest, src);
else {
strncpy(dest, src, len - 1);
dest[len-1] = 0;
}
}
return ret;
}
/*
* ppp_strlcat - like strcat/strncat, doesn't overflow destination buffer,
* always leaves destination null-terminated (for len > 0).
*/
size_t ppp_strlcat(char *dest, const char *src, size_t len) {
size_t dlen = strlen(dest);
return dlen + ppp_strlcpy(dest + dlen, src, (len > dlen? len - dlen: 0));
}
/*
* ppp_slprintf - format a message into a buffer. Like sprintf except we
* also specify the length of the output buffer, and we handle
* %m (error message), %v (visible string),
* %q (quoted string), %t (current time) and %I (IP address) formats.
* Doesn't do floating-point formats.
* Returns the number of chars put into buf.
*/
int ppp_slprintf(char *buf, int buflen, const char *fmt, ...) {
va_list args;
int n;
va_start(args, fmt);
n = ppp_vslprintf(buf, buflen, fmt, args);
va_end(args);
return n;
}
/*
* ppp_vslprintf - like ppp_slprintf, takes a va_list instead of a list of args.
*/
#define OUTCHAR(c) (buflen > 0? (--buflen, *buf++ = (c)): 0)
int ppp_vslprintf(char *buf, int buflen, const char *fmt, va_list args) {
int c, i, n;
int width, prec, fillch;
int base, len, neg, quoted;
unsigned long val = 0;
const char *f;
char *str, *buf0;
const unsigned char *p;
char num[32];
#if 0 /* need port */
time_t t;
#endif /* need port */
u32_t ip;
static char hexchars[] = "0123456789abcdef";
#if PRINTPKT_SUPPORT
struct buffer_info bufinfo;
#endif /* PRINTPKT_SUPPORT */
buf0 = buf;
--buflen;
while (buflen > 0) {
for (f = fmt; *f != '%' && *f != 0; ++f)
;
if (f > fmt) {
len = f - fmt;
if (len > buflen)
len = buflen;
memcpy(buf, fmt, len);
buf += len;
buflen -= len;
fmt = f;
}
if (*fmt == 0)
break;
c = *++fmt;
width = 0;
prec = -1;
fillch = ' ';
if (c == '0') {
fillch = '0';
c = *++fmt;
}
if (c == '*') {
width = va_arg(args, int);
c = *++fmt;
} else {
while (isdigit(c)) {
width = width * 10 + c - '0';
c = *++fmt;
}
}
if (c == '.') {
c = *++fmt;
if (c == '*') {
prec = va_arg(args, int);
c = *++fmt;
} else {
prec = 0;
while (isdigit(c)) {
prec = prec * 10 + c - '0';
c = *++fmt;
}
}
}
str = 0;
base = 0;
neg = 0;
++fmt;
switch (c) {
case 'l':
c = *fmt++;
switch (c) {
case 'd':
val = va_arg(args, long);
if ((long)val < 0) {
neg = 1;
val = (unsigned long)-(long)val;
}
base = 10;
break;
case 'u':
val = va_arg(args, unsigned long);
base = 10;
break;
default:
OUTCHAR('%');
OUTCHAR('l');
--fmt; /* so %lz outputs %lz etc. */
continue;
}
break;
case 'd':
i = va_arg(args, int);
if (i < 0) {
neg = 1;
val = -i;
} else
val = i;
base = 10;
break;
case 'u':
val = va_arg(args, unsigned int);
base = 10;
break;
case 'o':
val = va_arg(args, unsigned int);
base = 8;
break;
case 'x':
case 'X':
val = va_arg(args, unsigned int);
base = 16;
break;
#if 0 /* unused (and wrong on LLP64 systems) */
case 'p':
val = (unsigned long) va_arg(args, void *);
base = 16;
neg = 2;
break;
#endif /* unused (and wrong on LLP64 systems) */
case 's':
str = va_arg(args, char *);
break;
case 'c':
num[0] = va_arg(args, int);
num[1] = 0;
str = num;
break;
#if 0 /* do we always have strerror() in embedded ? */
case 'm':
str = strerror(errno);
break;
#endif /* do we always have strerror() in embedded ? */
case 'I':
ip = va_arg(args, u32_t);
ip = lwip_ntohl(ip);
ppp_slprintf(num, sizeof(num), "%d.%d.%d.%d", (ip >> 24) & 0xff,
(ip >> 16) & 0xff, (ip >> 8) & 0xff, ip & 0xff);
str = num;
break;
#if 0 /* need port */
case 't':
time(&t);
str = ctime(&t);
str += 4; /* chop off the day name */
str[15] = 0; /* chop off year and newline */
break;
#endif /* need port */
case 'v': /* "visible" string */
case 'q': /* quoted string */
quoted = c == 'q';
p = va_arg(args, unsigned char *);
if (p == NULL)
p = (const unsigned char *)"<NULL>";
if (fillch == '0' && prec >= 0) {
n = prec;
} else {
n = strlen((const char *)p);
if (prec >= 0 && n > prec)
n = prec;
}
while (n > 0 && buflen > 0) {
c = *p++;
--n;
if (!quoted && c >= 0x80) {
OUTCHAR('M');
OUTCHAR('-');
c -= 0x80;
}
if (quoted && (c == '"' || c == '\\'))
OUTCHAR('\\');
if (c < 0x20 || (0x7f <= c && c < 0xa0)) {
if (quoted) {
OUTCHAR('\\');
switch (c) {
case '\t': OUTCHAR('t'); break;
case '\n': OUTCHAR('n'); break;
case '\b': OUTCHAR('b'); break;
case '\f': OUTCHAR('f'); break;
default:
OUTCHAR('x');
OUTCHAR(hexchars[c >> 4]);
OUTCHAR(hexchars[c & 0xf]);
}
} else {
if (c == '\t')
OUTCHAR(c);
else {
OUTCHAR('^');
OUTCHAR(c ^ 0x40);
}
}
} else
OUTCHAR(c);
}
continue;
#if PRINTPKT_SUPPORT
case 'P': /* print PPP packet */
bufinfo.ptr = buf;
bufinfo.len = buflen + 1;
p = va_arg(args, unsigned char *);
n = va_arg(args, int);
ppp_format_packet(p, n, ppp_vslp_printer, &bufinfo);
buf = bufinfo.ptr;
buflen = bufinfo.len - 1;
continue;
#endif /* PRINTPKT_SUPPORT */
case 'B':
p = va_arg(args, unsigned char *);
for (n = prec; n > 0; --n) {
c = *p++;
if (fillch == ' ')
OUTCHAR(' ');
OUTCHAR(hexchars[(c >> 4) & 0xf]);
OUTCHAR(hexchars[c & 0xf]);
}
continue;
default:
*buf++ = '%';
if (c != '%')
--fmt; /* so %z outputs %z etc. */
--buflen;
continue;
}
if (base != 0) {
str = num + sizeof(num);
*--str = 0;
while (str > num + neg) {
*--str = hexchars[val % base];
val = val / base;
if (--prec <= 0 && val == 0)
break;
}
switch (neg) {
case 1:
*--str = '-';
break;
case 2:
*--str = 'x';
*--str = '0';
break;
default:
break;
}
len = num + sizeof(num) - 1 - str;
} else {
len = strlen(str);
if (prec >= 0 && len > prec)
len = prec;
}
if (width > 0) {
if (width > buflen)
width = buflen;
if ((n = width - len) > 0) {
buflen -= n;
for (; n > 0; --n)
*buf++ = fillch;
}
}
if (len > buflen)
len = buflen;
memcpy(buf, str, len);
buf += len;
buflen -= len;
}
*buf = 0;
return buf - buf0;
}
#if PRINTPKT_SUPPORT
/*
* vslp_printer - used in processing a %P format
*/
static void ppp_vslp_printer(void *arg, const char *fmt, ...) {
int n;
va_list pvar;
struct buffer_info *bi;
va_start(pvar, fmt);
bi = (struct buffer_info *) arg;
n = ppp_vslprintf(bi->ptr, bi->len, fmt, pvar);
va_end(pvar);
bi->ptr += n;
bi->len -= n;
}
#endif /* PRINTPKT_SUPPORT */
#if 0 /* 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);
ppp_format_packet(p, len, pr_log, &level);
end_pr_log();
}
#endif /* UNUSED */
#if PRINTPKT_SUPPORT
/*
* ppp_format_packet - make a readable representation of a packet,
* calling `printer(arg, format, ...)' to output it.
*/
static void ppp_format_packet(const u_char *p, int len,
void (*printer) (void *, const char *, ...), void *arg) {
int i, n;
u_short proto;
const struct protent *protp;
if (len >= 2) {
GETSHORT(proto, p);
len -= 2;
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);
}
#endif /* PRINTPKT_SUPPORT */
#if 0 /* UNUSED */
/*
* 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) {
ppp_strlcpy(line, prefix, sizeof(line));
linep = line + strlen(line);
}
llevel = level;
}
void
end_pr_log()
{
if (linep != line) {
*linep = 0;
ppp_log_write(llevel, line);
}
}
/*
* pr_log - printer routine for outputting to log
*/
void
pr_log (void *arg, const char *fmt, ...)
{
int l, n;
va_list pvar;
char *p, *eol;
char buf[256];
va_start(pvar, fmt);
n = ppp_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;
ppp_log_write(llevel, line);
linep = line;
}
while (eol != NULL) {
*eol = 0;
ppp_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;
}
}
#endif /* UNUSED */
/*
* ppp_print_string - print a readable representation of a string using
* printer.
*/
void ppp_print_string(const u_char *p, int len, void (*printer) (void *, const 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", (u8_t)c);
/* no break */
}
}
}
printer(arg, "\"");
}
/*
* ppp_logit - does the hard work for fatal et al.
*/
static void ppp_logit(int level, const char *fmt, va_list args) {
char buf[1024];
ppp_vslprintf(buf, sizeof(buf), fmt, args);
ppp_log_write(level, buf);
}
static void ppp_log_write(int level, char *buf) {
LWIP_UNUSED_ARG(level); /* necessary if PPPDEBUG is defined to an empty function */
LWIP_UNUSED_ARG(buf);
PPPDEBUG(level, ("%s\n", buf) );
#if 0
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;
}
#endif
}
/*
* ppp_fatal - log an error message and die horribly.
*/
void ppp_fatal(const char *fmt, ...) {
va_list pvar;
va_start(pvar, fmt);
ppp_logit(LOG_ERR, fmt, pvar);
va_end(pvar);
LWIP_ASSERT("ppp_fatal", 0); /* as promised */
}
/*
* ppp_error - log an error message.
*/
void ppp_error(const char *fmt, ...) {
va_list pvar;
va_start(pvar, fmt);
ppp_logit(LOG_ERR, fmt, pvar);
va_end(pvar);
#if 0 /* UNUSED */
++error_count;
#endif /* UNUSED */
}
/*
* ppp_warn - log a warning message.
*/
void ppp_warn(const char *fmt, ...) {
va_list pvar;
va_start(pvar, fmt);
ppp_logit(LOG_WARNING, fmt, pvar);
va_end(pvar);
}
/*
* ppp_notice - log a notice-level message.
*/
void ppp_notice(const char *fmt, ...) {
va_list pvar;
va_start(pvar, fmt);
ppp_logit(LOG_NOTICE, fmt, pvar);
va_end(pvar);
}
/*
* ppp_info - log an informational message.
*/
void ppp_info(const char *fmt, ...) {
va_list pvar;
va_start(pvar, fmt);
ppp_logit(LOG_INFO, fmt, pvar);
va_end(pvar);
}
/*
* ppp_dbglog - log a debug message.
*/
void ppp_dbglog(const char *fmt, ...) {
va_list pvar;
va_start(pvar, fmt);
ppp_logit(LOG_DEBUG, fmt, pvar);
va_end(pvar);
}
#if PRINTPKT_SUPPORT
/*
* ppp_dump_packet - print out a packet in readable form if it is interesting.
* Assumes len >= PPP_HDRLEN.
*/
void ppp_dump_packet(ppp_pcb *pcb, const char *tag, unsigned char *p, int len) {
int proto;
/*
* don't print data packets, i.e. IPv4, IPv6, VJ, and compressed packets.
*/
proto = (p[0] << 8) + p[1];
if (proto < 0xC000 && (proto & ~0x8000) == proto)
return;
/*
* don't print valid LCP echo request/reply packets if the link is up.
*/
if (proto == PPP_LCP && pcb->phase == PPP_PHASE_RUNNING && len >= 2 + HEADERLEN) {
unsigned char *lcp = p + 2;
int l = (lcp[2] << 8) + lcp[3];
if ((lcp[0] == ECHOREQ || lcp[0] == ECHOREP)
&& l >= HEADERLEN && l <= len - 2)
return;
}
ppp_dbglog("%s %P", tag, p, len);
}
#endif /* PRINTPKT_SUPPORT */
#if 0 /* Unused */
/*
* 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) {
ppp_strlcpy(lock_file, dev, sizeof(lock_file));
return 0;
}
if (result > 0)
ppp_notice("Device %s is locked by pid %d", dev, result);
else
ppp_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) {
ppp_error("Can't get device number for %s: %m", dev);
return -1;
}
if ((sbuf.st_mode & S_IFMT) != S_IFCHR) {
ppp_error("Can't lock %s: not a character device", dev);
return -1;
}
ppp_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;
ppp_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) {
ppp_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;
ppp_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) {
ppp_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) {
ppp_notice("Removed stale lock on %s (pid %d)", dev, pid);
continue;
}
ppp_warn("Couldn't remove stale lock on %s", dev);
} else
ppp_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
ppp_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) {
ppp_error("Couldn't reopen lock file %s: %m", lock_file);
lock_file[0] = 0;
return -1;
}
#ifndef LOCK_BINARY
ppp_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;
}
}
#endif /* Unused */
#endif /* PPP_SUPPORT */