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PL286/external/ppp/pppd/options.c

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/*
* options.c - handles option processing for PPP.
*
* Copyright (c) 1984-2000 Carnegie Mellon University. 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. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any legal
* details, please contact
* Office of Technology Transfer
* Carnegie Mellon University
* 5000 Forbes Avenue
* Pittsburgh, PA 15213-3890
* (412) 268-4387, fax: (412) 268-7395
* tech-transfer@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY 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.
*/
#define RCSID "$Id: options.c,v 1.102 2008/06/15 06:53:06 paulus Exp $"
#include <ctype.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <syslog.h>
#include <string.h>
#include <pwd.h>
#ifdef PLUGIN
#include <dlfcn.h>
#endif
#ifdef PPP_FILTER
#include <pcap.h>
/*
* There have been 3 or 4 different names for this in libpcap CVS, but
* this seems to be what they have settled on...
* For older versions of libpcap, use DLT_PPP - but that means
* we lose the inbound and outbound qualifiers.
*/
#ifndef DLT_PPP_PPPD
#ifdef DLT_PPP_WITHDIRECTION
#define DLT_PPP_PPPD DLT_PPP_WITHDIRECTION
#else
#define DLT_PPP_PPPD DLT_PPP
#endif
#endif
#endif /* PPP_FILTER */
#include "pppd.h"
#include "pathnames.h"
#if defined(ultrix) || defined(NeXT)
char *strdup __P((char *));
#endif
static const char rcsid[] = RCSID;
struct option_value {
struct option_value *next;
const char *source;
char value[1];
};
/*
* Option variables and default values.
*/
int debug = 0; /* Debug flag */
int kdebugflag = 0; /* Tell kernel to print debug messages */
int default_device = 1; /* Using /dev/tty or equivalent */
char devnam[MAXPATHLEN]; /* Device name */
bool nodetach = 0; /* Don't detach from controlling tty */
bool updetach = 0; /* Detach once link is up */
bool master_detach; /* Detach when we're (only) multilink master */
int maxconnect = 0; /* Maximum connect time */
char user[MAXNAMELEN]; /* Username for PAP */
char passwd[MAXSECRETLEN]; /* Password for PAP */
bool persist = 0; /* Reopen link after it goes down */
char our_name[MAXNAMELEN]; /* Our name for authentication purposes */
bool demand = 0; /* do dial-on-demand */
char *ipparam = NULL; /* Extra parameter for ip up/down scripts */
int idle_time_limit = 0; /* Disconnect if idle for this many seconds */
int holdoff = 30; /* # seconds to pause before reconnecting */
bool holdoff_specified; /* true if a holdoff value has been given */
int log_to_fd = 1; /* send log messages to this fd too */
bool log_default = 1; /* log_to_fd is default (stdout) */
int maxfail = 10; /* max # of unsuccessful connection attempts */
char linkname[MAXPATHLEN]; /* logical name for link */
bool tune_kernel; /* may alter kernel settings */
int connect_delay = 1000; /* wait this many ms after connect script */
int req_unit = -1; /* requested interface unit */
bool multilink = 0; /* Enable multilink operation */
char *bundle_name = NULL; /* bundle name for multilink */
bool dump_options; /* print out option values */
bool dryrun; /* print out option values and exit */
char *domain; /* domain name set by domain option */
int child_wait = 5; /* # seconds to wait for children at exit */
struct userenv *userenv_list; /* user environment variables */
#ifdef MAXOCTETS
unsigned int maxoctets = 0; /* default - no limit */
int maxoctets_dir = 0; /* default - sum of traffic */
int maxoctets_timeout = 1; /* default 1 second */
#endif
extern option_t auth_options[];
extern struct stat devstat;
#ifdef PPP_FILTER
struct bpf_program pass_filter;/* Filter program for packets to pass */
struct bpf_program active_filter; /* Filter program for link-active pkts */
#endif
static option_t *curopt; /* pointer to option being processed */
char *current_option; /* the name of the option being parsed */
int privileged_option; /* set iff the current option came from root */
char *option_source; /* string saying where the option came from */
int option_priority = OPRIO_CFGFILE; /* priority of the current options */
bool devnam_fixed; /* can no longer change device name */
static int logfile_fd = -1; /* fd opened for log file */
static char logfile_name[MAXPATHLEN]; /* name of log file */
/*
* Prototypes
*/
static int setdomain __P((char **));
static int readfile __P((char **));
static int callfile __P((char **));
static int showversion __P((char **));
static int showhelp __P((char **));
static void usage __P((void));
static int setlogfile __P((char **));
#ifdef PLUGIN
static int loadplugin __P((char **));
#endif
#ifdef PPP_FILTER
static int setpassfilter __P((char **));
static int setactivefilter __P((char **));
#endif
#ifdef MAXOCTETS
static int setmodir __P((char **));
#endif
static int user_setenv __P((char **));
static void user_setprint __P((option_t *, printer_func, void *));
static int user_unsetenv __P((char **));
static void user_unsetprint __P((option_t *, printer_func, void *));
static option_t *find_option __P((const char *name));
static int process_option __P((option_t *, char *, char **));
static int n_arguments __P((option_t *));
static int number_option __P((char *, u_int32_t *, int));
/*
* Structure to store extra lists of options.
*/
struct option_list {
option_t *options;
struct option_list *next;
};
static struct option_list *extra_options = NULL;
/*
* Valid arguments.
*/
option_t general_options[] = {
{ "debug", o_int, &debug,
"Increase debugging level", OPT_INC | OPT_NOARG | 1 },
{ "-d", o_int, &debug,
"Increase debugging level",
OPT_ALIAS | OPT_INC | OPT_NOARG | 1 },
{ "kdebug", o_int, &kdebugflag,
"Set kernel driver debug level", OPT_PRIO },
{ "nodetach", o_bool, &nodetach,
"Don't detach from controlling tty", OPT_PRIO | 1 },
{ "-detach", o_bool, &nodetach,
"Don't detach from controlling tty", OPT_ALIAS | OPT_PRIOSUB | 1 },
{ "updetach", o_bool, &updetach,
"Detach from controlling tty once link is up",
OPT_PRIOSUB | OPT_A2CLR | 1, &nodetach },
{ "master_detach", o_bool, &master_detach,
"Detach when we're multilink master but have no link", 1 },
{ "holdoff", o_int, &holdoff,
"Set time in seconds before retrying connection",
OPT_PRIO, &holdoff_specified },
{ "idle", o_int, &idle_time_limit,
"Set time in seconds before disconnecting idle link", OPT_PRIO },
{ "maxconnect", o_int, &maxconnect,
"Set connection time limit",
OPT_PRIO | OPT_LLIMIT | OPT_NOINCR | OPT_ZEROINF },
{ "domain", o_special, (void *)setdomain,
"Add given domain name to hostname",
OPT_PRIO | OPT_PRIV | OPT_A2STRVAL, &domain },
{ "file", o_special, (void *)readfile,
"Take options from a file", OPT_NOPRINT },
{ "call", o_special, (void *)callfile,
"Take options from a privileged file", OPT_NOPRINT },
{ "persist", o_bool, &persist,
"Keep on reopening connection after close", OPT_PRIO | 1 },
{ "nopersist", o_bool, &persist,
"Turn off persist option", OPT_PRIOSUB },
{ "demand", o_bool, &demand,
"Dial on demand", OPT_INITONLY | 1, &persist },
{ "--version", o_special_noarg, (void *)showversion,
"Show version number" },
{ "--help", o_special_noarg, (void *)showhelp,
"Show brief listing of options" },
{ "-h", o_special_noarg, (void *)showhelp,
"Show brief listing of options", OPT_ALIAS },
{ "logfile", o_special, (void *)setlogfile,
"Append log messages to this file",
OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, &logfile_name },
{ "logfd", o_int, &log_to_fd,
"Send log messages to this file descriptor",
OPT_PRIOSUB | OPT_A2CLR, &log_default },
{ "nolog", o_int, &log_to_fd,
"Don't send log messages to any file",
OPT_PRIOSUB | OPT_NOARG | OPT_VAL(-1) },
{ "nologfd", o_int, &log_to_fd,
"Don't send log messages to any file descriptor",
OPT_PRIOSUB | OPT_ALIAS | OPT_NOARG | OPT_VAL(-1) },
{ "linkname", o_string, linkname,
"Set logical name for link",
OPT_PRIO | OPT_PRIV | OPT_STATIC, NULL, MAXPATHLEN },
{ "maxfail", o_int, &maxfail,
"Maximum number of unsuccessful connection attempts to allow",
OPT_PRIO },
{ "ktune", o_bool, &tune_kernel,
"Alter kernel settings as necessary", OPT_PRIO | 1 },
{ "noktune", o_bool, &tune_kernel,
"Don't alter kernel settings", OPT_PRIOSUB },
{ "connect-delay", o_int, &connect_delay,
"Maximum time (in ms) to wait after connect script finishes",
OPT_PRIO },
{ "unit", o_int, &req_unit,
"PPP interface unit number to use if possible",
OPT_PRIO | OPT_LLIMIT, 0, 0 },
{ "dump", o_bool, &dump_options,
"Print out option values after parsing all options", 1 },
{ "dryrun", o_bool, &dryrun,
"Stop after parsing, printing, and checking options", 1 },
{ "child-timeout", o_int, &child_wait,
"Number of seconds to wait for child processes at exit",
OPT_PRIO },
{ "set", o_special, (void *)user_setenv,
"Set user environment variable",
OPT_A2PRINTER | OPT_NOPRINT, (void *)user_setprint },
{ "unset", o_special, (void *)user_unsetenv,
"Unset user environment variable",
OPT_A2PRINTER | OPT_NOPRINT, (void *)user_unsetprint },
#ifdef HAVE_MULTILINK
{ "multilink", o_bool, &multilink,
"Enable multilink operation", OPT_PRIO | 1 },
{ "mp", o_bool, &multilink,
"Enable multilink operation", OPT_PRIOSUB | OPT_ALIAS | 1 },
{ "nomultilink", o_bool, &multilink,
"Disable multilink operation", OPT_PRIOSUB | 0 },
{ "nomp", o_bool, &multilink,
"Disable multilink operation", OPT_PRIOSUB | OPT_ALIAS | 0 },
{ "bundle", o_string, &bundle_name,
"Bundle name for multilink", OPT_PRIO },
#endif /* HAVE_MULTILINK */
#ifdef PLUGIN
{ "plugin", o_special, (void *)loadplugin,
"Load a plug-in module into pppd", OPT_PRIV | OPT_A2LIST },
#endif
#ifdef PPP_FILTER
{ "pass-filter", o_special, setpassfilter,
"set filter for packets to pass", OPT_PRIO },
{ "active-filter", o_special, setactivefilter,
"set filter for active pkts", OPT_PRIO },
#endif
#ifdef MAXOCTETS
{ "maxoctets", o_int, &maxoctets,
"Set connection traffic limit",
OPT_PRIO | OPT_LLIMIT | OPT_NOINCR | OPT_ZEROINF },
{ "mo", o_int, &maxoctets,
"Set connection traffic limit",
OPT_ALIAS | OPT_PRIO | OPT_LLIMIT | OPT_NOINCR | OPT_ZEROINF },
{ "mo-direction", o_special, setmodir,
"Set direction for limit traffic (sum,in,out,max)" },
{ "mo-timeout", o_int, &maxoctets_timeout,
"Check for traffic limit every N seconds", OPT_PRIO | OPT_LLIMIT | 1 },
#endif
{ NULL }
};
#ifndef IMPLEMENTATION
#define IMPLEMENTATION ""
#endif
static char *usage_string = "\
pppd version %s\n\
Usage: %s [ options ], where options are:\n\
<device> Communicate over the named device\n\
<speed> Set the baud rate to <speed>\n\
<loc>:<rem> Set the local and/or remote interface IP\n\
addresses. Either one may be omitted.\n\
asyncmap <n> Set the desired async map to hex <n>\n\
auth Require authentication from peer\n\
connect <p> Invoke shell command <p> to set up the serial line\n\
crtscts Use hardware RTS/CTS flow control\n\
defaultroute Add default route through interface\n\
file <f> Take options from file <f>\n\
modem Use modem control lines\n\
mru <n> Set MRU value to <n> for negotiation\n\
See pppd(8) for more options.\n\
";
/*
* parse_args - parse a string of arguments from the command line.
*/
int
parse_args(argc, argv)
int argc;
char **argv;
{
char *arg;
option_t *opt;
int n;
privileged_option = privileged;
option_source = "command line";
option_priority = OPRIO_CMDLINE;
while (argc > 0) {
arg = *argv++;
--argc;
opt = find_option(arg);
if (opt == NULL) {
option_error("unrecognized option '%s'", arg);
usage();
return 0;
}
n = n_arguments(opt);
if (argc < n) {
option_error("too few parameters for option %s", arg);
return 0;
}
if (!process_option(opt, arg, argv))
return 0;
argc -= n;
argv += n;
}
return 1;
}
/*
* options_from_file - Read a string of options from a file,
* and interpret them.
*/
int
options_from_file(filename, must_exist, check_prot, priv)
char *filename;
int must_exist;
int check_prot;
int priv;
{
FILE *f;
int i, newline, ret, err;
option_t *opt;
int oldpriv, n;
char *oldsource;
uid_t euid;
char *argv[MAXARGS];
char args[MAXARGS][MAXWORDLEN];
char cmd[MAXWORDLEN];
euid = geteuid();
if (check_prot && seteuid(getuid()) == -1) {
option_error("unable to drop privileges to open %s: %m", filename);
return 0;
}
f = fopen(filename, "r");
err = errno;
if (check_prot && seteuid(euid) == -1)
fatal("unable to regain privileges");
if (f == NULL) {
errno = err;
if (!must_exist) {
if (err != ENOENT && err != ENOTDIR)
warn("Warning: can't open options file %s: %m", filename);
return 1;
}
option_error("Can't open options file %s: %m", filename);
return 0;
}
oldpriv = privileged_option;
privileged_option = priv;
oldsource = option_source;
option_source = strdup(filename);
if (option_source == NULL)
option_source = "file";
ret = 0;
while (getword(f, cmd, &newline, filename)) {
opt = find_option(cmd);
if (opt == NULL) {
option_error("In file %s: unrecognized option '%s'",
filename, cmd);
goto err;
}
n = n_arguments(opt);
for (i = 0; i < n; ++i) {
if (!getword(f, args[i], &newline, filename)) {
option_error(
"In file %s: too few parameters for option '%s'",
filename, cmd);
goto err;
}
argv[i] = args[i];
}
if (!process_option(opt, cmd, argv))
goto err;
}
ret = 1;
err:
fclose(f);
privileged_option = oldpriv;
option_source = oldsource;
return ret;
}
/*
* options_from_user - See if the use has a ~/.ppprc file,
* and if so, interpret options from it.
*/
int
options_from_user()
{
char *user, *path, *file;
int ret;
struct passwd *pw;
size_t pl;
pw = getpwuid(getuid());
if (pw == NULL || (user = pw->pw_dir) == NULL || user[0] == 0)
return 1;
file = _PATH_USEROPT;
pl = strlen(user) + strlen(file) + 2;
path = malloc(pl);
if (path == NULL)
novm("init file name");
slprintf(path, pl, "%s/%s", user, file);
option_priority = OPRIO_CFGFILE;
ret = options_from_file(path, 0, 1, privileged);
free(path);
return ret;
}
/*
* options_for_tty - See if an options file exists for the serial
* device, and if so, interpret options from it.
* We only allow the per-tty options file to override anything from
* the command line if it is something that the user can't override
* once it has been set by root; this is done by giving configuration
* files a lower priority than the command line.
*/
int
options_for_tty()
{
char *dev, *path, *p;
int ret;
size_t pl;
dev = devnam;
if ((p = strstr(dev, "/dev/")) != NULL)
dev = p + 5;
if (dev[0] == 0 || strcmp(dev, "tty") == 0)
return 1; /* don't look for /etc/ppp/options.tty */
pl = strlen(_PATH_TTYOPT) + strlen(dev) + 1;
path = malloc(pl);
if (path == NULL)
novm("tty init file name");
slprintf(path, pl, "%s%s", _PATH_TTYOPT, dev);
/* Turn slashes into dots, for Solaris case (e.g. /dev/term/a) */
for (p = path + strlen(_PATH_TTYOPT); *p != 0; ++p)
if (*p == '/')
*p = '.';
option_priority = OPRIO_CFGFILE;
ret = options_from_file(path, 0, 0, 1);
free(path);
return ret;
}
/*
* options_from_list - process a string of options in a wordlist.
*/
int
options_from_list(w, priv)
struct wordlist *w;
int priv;
{
char *argv[MAXARGS];
option_t *opt;
int i, n, ret = 0;
struct wordlist *w0;
privileged_option = priv;
option_source = "secrets file";
option_priority = OPRIO_SECFILE;
while (w != NULL) {
opt = find_option(w->word);
if (opt == NULL) {
option_error("In secrets file: unrecognized option '%s'",
w->word);
goto err;
}
n = n_arguments(opt);
w0 = w;
for (i = 0; i < n; ++i) {
w = w->next;
if (w == NULL) {
option_error(
"In secrets file: too few parameters for option '%s'",
w0->word);
goto err;
}
argv[i] = w->word;
}
if (!process_option(opt, w0->word, argv))
goto err;
w = w->next;
}
ret = 1;
err:
return ret;
}
/*
* match_option - see if this option matches an option_t structure.
*/
static int
match_option(name, opt, dowild)
char *name;
option_t *opt;
int dowild;
{
int (*match) __P((char *, char **, int));
if (dowild != (opt->type == o_wild))
return 0;
if (!dowild)
return strcmp(name, opt->name) == 0;
match = (int (*) __P((char *, char **, int))) opt->addr;
return (*match)(name, NULL, 0);
}
/*
* find_option - scan the option lists for the various protocols
* looking for an entry with the given name.
* This could be optimized by using a hash table.
*/
static option_t *
find_option(name)
const char *name;
{
option_t *opt;
struct option_list *list;
int i, dowild;
for (dowild = 0; dowild <= 1; ++dowild) {
for (opt = general_options; opt->name != NULL; ++opt)
if (match_option(name, opt, dowild))
return opt;
for (opt = auth_options; opt->name != NULL; ++opt)
if (match_option(name, opt, dowild))
return opt;
for (list = extra_options; list != NULL; list = list->next)
for (opt = list->options; opt->name != NULL; ++opt)
if (match_option(name, opt, dowild))
return opt;
for (opt = the_channel->options; opt->name != NULL; ++opt)
if (match_option(name, opt, dowild))
return opt;
for (i = 0; protocols[i] != NULL; ++i)
if ((opt = protocols[i]->options) != NULL)
for (; opt->name != NULL; ++opt)
if (match_option(name, opt, dowild))
return opt;
}
return NULL;
}
/*
* process_option - process one new-style option.
*/
static int
process_option(opt, cmd, argv)
option_t *opt;
char *cmd;
char **argv;
{
u_int32_t v;
int iv, a;
char *sv;
int (*parser) __P((char **));
int (*wildp) __P((char *, char **, int));
char *optopt = (opt->type == o_wild)? "": " option";
int prio = option_priority;
option_t *mainopt = opt;
current_option = opt->name;
if ((opt->flags & OPT_PRIVFIX) && privileged_option)
prio += OPRIO_ROOT;
while (mainopt->flags & OPT_PRIOSUB)
--mainopt;
if (mainopt->flags & OPT_PRIO) {
if (prio < mainopt->priority) {
/* new value doesn't override old */
if (prio == OPRIO_CMDLINE && mainopt->priority > OPRIO_ROOT) {
option_error("%s%s set in %s cannot be overridden\n",
opt->name, optopt, mainopt->source);
return 0;
}
return 1;
}
if (prio > OPRIO_ROOT && mainopt->priority == OPRIO_CMDLINE)
warn("%s%s from %s overrides command line",
opt->name, optopt, option_source);
}
if ((opt->flags & OPT_INITONLY) && phase != PHASE_INITIALIZE) {
option_error("%s%s cannot be changed after initialization",
opt->name, optopt);
return 0;
}
if ((opt->flags & OPT_PRIV) && !privileged_option) {
option_error("using the %s%s requires root privilege",
opt->name, optopt);
return 0;
}
if ((opt->flags & OPT_ENABLE) && *(bool *)(opt->addr2) == 0) {
option_error("%s%s is disabled", opt->name, optopt);
return 0;
}
if ((opt->flags & OPT_DEVEQUIV) && devnam_fixed) {
option_error("the %s%s may not be changed in %s",
opt->name, optopt, option_source);
return 0;
}
switch (opt->type) {
case o_bool:
v = opt->flags & OPT_VALUE;
*(bool *)(opt->addr) = v;
if (opt->addr2 && (opt->flags & OPT_A2COPY))
*(bool *)(opt->addr2) = v;
else if (opt->addr2 && (opt->flags & OPT_A2CLR))
*(bool *)(opt->addr2) = 0;
else if (opt->addr2 && (opt->flags & OPT_A2CLRB))
*(u_char *)(opt->addr2) &= ~v;
else if (opt->addr2 && (opt->flags & OPT_A2OR))
*(u_char *)(opt->addr2) |= v;
break;
case o_int:
iv = 0;
if ((opt->flags & OPT_NOARG) == 0) {
if (!int_option(*argv, &iv))
return 0;
if ((((opt->flags & OPT_LLIMIT) && iv < opt->lower_limit)
|| ((opt->flags & OPT_ULIMIT) && iv > opt->upper_limit))
&& !((opt->flags & OPT_ZEROOK && iv == 0))) {
char *zok = (opt->flags & OPT_ZEROOK)? " zero or": "";
switch (opt->flags & OPT_LIMITS) {
case OPT_LLIMIT:
option_error("%s value must be%s >= %d",
opt->name, zok, opt->lower_limit);
break;
case OPT_ULIMIT:
option_error("%s value must be%s <= %d",
opt->name, zok, opt->upper_limit);
break;
case OPT_LIMITS:
option_error("%s value must be%s between %d and %d",
opt->name, zok, opt->lower_limit, opt->upper_limit);
break;
}
return 0;
}
}
a = opt->flags & OPT_VALUE;
if (a >= 128)
a -= 256; /* sign extend */
iv += a;
if (opt->flags & OPT_INC)
iv += *(int *)(opt->addr);
if ((opt->flags & OPT_NOINCR) && !privileged_option) {
int oldv = *(int *)(opt->addr);
if ((opt->flags & OPT_ZEROINF) ?
(oldv != 0 && (iv == 0 || iv > oldv)) : (iv > oldv)) {
option_error("%s value cannot be increased", opt->name);
return 0;
}
}
*(int *)(opt->addr) = iv;
if (opt->addr2 && (opt->flags & OPT_A2COPY))
*(int *)(opt->addr2) = iv;
break;
case o_uint32:
if (opt->flags & OPT_NOARG) {
v = opt->flags & OPT_VALUE;
if (v & 0x80)
v |= 0xffffff00U;
} else if (!number_option(*argv, &v, 16))
return 0;
if (opt->flags & OPT_OR)
v |= *(u_int32_t *)(opt->addr);
*(u_int32_t *)(opt->addr) = v;
if (opt->addr2 && (opt->flags & OPT_A2COPY))
*(u_int32_t *)(opt->addr2) = v;
break;
case o_string:
if (opt->flags & OPT_STATIC) {
strlcpy((char *)(opt->addr), *argv, opt->upper_limit);
} else {
char **optptr = (char **)(opt->addr);
sv = strdup(*argv);
if (sv == NULL)
novm("option argument");
if (*optptr)
free(*optptr);
*optptr = sv;
}
break;
case o_special_noarg:
case o_special:
parser = (int (*) __P((char **))) opt->addr;
curopt = opt;
if (!(*parser)(argv))
return 0;
if (opt->flags & OPT_A2LIST) {
struct option_value *ovp, *pp;
ovp = malloc(sizeof(*ovp) + strlen(*argv));
if (ovp != 0) {
strcpy(ovp->value, *argv);
ovp->source = option_source;
ovp->next = NULL;
if (opt->addr2 == NULL) {
opt->addr2 = ovp;
} else {
for (pp = opt->addr2; pp->next != NULL; pp = pp->next)
;
pp->next = ovp;
}
}
}
break;
case o_wild:
wildp = (int (*) __P((char *, char **, int))) opt->addr;
if (!(*wildp)(cmd, argv, 1))
return 0;
break;
}
/*
* If addr2 wasn't used by any flag (OPT_A2COPY, etc.) but is set,
* treat it as a bool and set/clear it based on the OPT_A2CLR bit.
*/
if (opt->addr2 && (opt->flags & (OPT_A2COPY|OPT_ENABLE
|OPT_A2PRINTER|OPT_A2STRVAL|OPT_A2LIST|OPT_A2OR)) == 0)
*(bool *)(opt->addr2) = !(opt->flags & OPT_A2CLR);
mainopt->source = option_source;
mainopt->priority = prio;
mainopt->winner = opt - mainopt;
return 1;
}
/*
* override_value - if the option priorities would permit us to
* override the value of option, return 1 and update the priority
* and source of the option value. Otherwise returns 0.
*/
int
override_value(option, priority, source)
const char *option;
int priority;
const char *source;
{
option_t *opt;
opt = find_option(option);
if (opt == NULL)
return 0;
while (opt->flags & OPT_PRIOSUB)
--opt;
if ((opt->flags & OPT_PRIO) && priority < opt->priority)
return 0;
opt->priority = priority;
opt->source = source;
opt->winner = -1;
return 1;
}
/*
* n_arguments - tell how many arguments an option takes
*/
static int
n_arguments(opt)
option_t *opt;
{
return (opt->type == o_bool || opt->type == o_special_noarg
|| (opt->flags & OPT_NOARG))? 0: 1;
}
/*
* add_options - add a list of options to the set we grok.
*/
void
add_options(opt)
option_t *opt;
{
struct option_list *list;
list = malloc(sizeof(*list));
if (list == 0)
novm("option list entry");
list->options = opt;
list->next = extra_options;
extra_options = list;
}
/*
* check_options - check that options are valid and consistent.
*/
void
check_options()
{
if (logfile_fd >= 0 && logfile_fd != log_to_fd)
close(logfile_fd);
}
/*
* print_option - print out an option and its value
*/
static void
print_option(opt, mainopt, printer, arg)
option_t *opt, *mainopt;
printer_func printer;
void *arg;
{
int i, v;
char *p;
if (opt->flags & OPT_NOPRINT)
return;
switch (opt->type) {
case o_bool:
v = opt->flags & OPT_VALUE;
if (*(bool *)opt->addr != v)
/* this can happen legitimately, e.g. lock
option turned off for default device */
break;
printer(arg, "%s", opt->name);
break;
case o_int:
v = opt->flags & OPT_VALUE;
if (v >= 128)
v -= 256;
i = *(int *)opt->addr;
if (opt->flags & OPT_NOARG) {
printer(arg, "%s", opt->name);
if (i != v) {
if (opt->flags & OPT_INC) {
for (; i > v; i -= v)
printer(arg, " %s", opt->name);
} else
printer(arg, " # oops: %d not %d\n",
i, v);
}
} else {
printer(arg, "%s %d", opt->name, i);
}
break;
case o_uint32:
printer(arg, "%s", opt->name);
if ((opt->flags & OPT_NOARG) == 0)
printer(arg, " %x", *(u_int32_t *)opt->addr);
break;
case o_string:
if (opt->flags & OPT_HIDE) {
p = "??????";
} else {
p = (char *) opt->addr;
if ((opt->flags & OPT_STATIC) == 0)
p = *(char **)p;
}
printer(arg, "%s %q", opt->name, p);
break;
case o_special:
case o_special_noarg:
case o_wild:
if (opt->type != o_wild) {
printer(arg, "%s", opt->name);
if (n_arguments(opt) == 0)
break;
printer(arg, " ");
}
if (opt->flags & OPT_A2PRINTER) {
void (*oprt) __P((option_t *, printer_func, void *));
oprt = (void (*) __P((option_t *, printer_func,
void *)))opt->addr2;
(*oprt)(opt, printer, arg);
} else if (opt->flags & OPT_A2STRVAL) {
p = (char *) opt->addr2;
if ((opt->flags & OPT_STATIC) == 0)
p = *(char **)p;
printer("%q", p);
} else if (opt->flags & OPT_A2LIST) {
struct option_value *ovp;
ovp = (struct option_value *) opt->addr2;
for (;;) {
printer(arg, "%q", ovp->value);
if ((ovp = ovp->next) == NULL)
break;
printer(arg, "\t\t# (from %s)\n%s ",
ovp->source, opt->name);
}
} else {
printer(arg, "xxx # [don't know how to print value]");
}
break;
default:
printer(arg, "# %s value (type %d\?\?)", opt->name, opt->type);
break;
}
printer(arg, "\t\t# (from %s)\n", mainopt->source);
}
/*
* print_option_list - print out options in effect from an
* array of options.
*/
static void
print_option_list(opt, printer, arg)
option_t *opt;
printer_func printer;
void *arg;
{
while (opt->name != NULL) {
if (opt->priority != OPRIO_DEFAULT
&& opt->winner != (short int) -1)
print_option(opt + opt->winner, opt, printer, arg);
do {
++opt;
} while (opt->flags & OPT_PRIOSUB);
}
}
/*
* print_options - print out what options are in effect.
*/
void
print_options(printer, arg)
printer_func printer;
void *arg;
{
struct option_list *list;
int i;
printer(arg, "pppd options in effect:\n");
print_option_list(general_options, printer, arg);
print_option_list(auth_options, printer, arg);
for (list = extra_options; list != NULL; list = list->next)
print_option_list(list->options, printer, arg);
print_option_list(the_channel->options, printer, arg);
for (i = 0; protocols[i] != NULL; ++i)
print_option_list(protocols[i]->options, printer, arg);
}
/*
* usage - print out a message telling how to use the program.
*/
static void
usage()
{
if (phase == PHASE_INITIALIZE)
fprintf(stderr, usage_string, VERSION, progname);
}
/*
* showhelp - print out usage message and exit.
*/
static int
showhelp(argv)
char **argv;
{
if (phase == PHASE_INITIALIZE) {
usage();
exit(0);
}
return 0;
}
/*
* showversion - print out the version number and exit.
*/
static int
showversion(argv)
char **argv;
{
if (phase == PHASE_INITIALIZE) {
fprintf(stderr, "pppd version %s\n", VERSION);
exit(0);
}
return 0;
}
/*
* option_error - print a message about an error in an option.
* The message is logged, and also sent to
* stderr if phase == PHASE_INITIALIZE.
*/
void
option_error __V((char *fmt, ...))
{
va_list args;
char buf[1024];
#if defined(__STDC__)
va_start(args, fmt);
#else
char *fmt;
va_start(args);
fmt = va_arg(args, char *);
#endif
vslprintf(buf, sizeof(buf), fmt, args);
va_end(args);
if (phase == PHASE_INITIALIZE)
fprintf(stderr, "%s: %s\n", progname, buf);
syslog(LOG_ERR, "%s", buf);
}
#if 0
/*
* readable - check if a file is readable by the real user.
*/
int
readable(fd)
int fd;
{
uid_t uid;
int i;
struct stat sbuf;
uid = getuid();
if (uid == 0)
return 1;
if (fstat(fd, &sbuf) != 0)
return 0;
if (sbuf.st_uid == uid)
return sbuf.st_mode & S_IRUSR;
if (sbuf.st_gid == getgid())
return sbuf.st_mode & S_IRGRP;
for (i = 0; i < ngroups; ++i)
if (sbuf.st_gid == groups[i])
return sbuf.st_mode & S_IRGRP;
return sbuf.st_mode & S_IROTH;
}
#endif
/*
* Read a word from a file.
* Words are delimited by white-space or by quotes (" or ').
* Quotes, white-space and \ may be escaped with \.
* \<newline> is ignored.
*/
int
getword(f, word, newlinep, filename)
FILE *f;
char *word;
int *newlinep;
char *filename;
{
int c, len, escape;
int quoted, comment;
int value, digit, got, n;
#define isoctal(c) ((c) >= '0' && (c) < '8')
*newlinep = 0;
len = 0;
escape = 0;
comment = 0;
quoted = 0;
/*
* First skip white-space and comments.
*/
for (;;) {
c = getc(f);
if (c == EOF)
break;
/*
* A newline means the end of a comment; backslash-newline
* is ignored. Note that we cannot have escape && comment.
*/
if (c == '\n') {
if (!escape) {
*newlinep = 1;
comment = 0;
} else
escape = 0;
continue;
}
/*
* Ignore characters other than newline in a comment.
*/
if (comment)
continue;
/*
* If this character is escaped, we have a word start.
*/
if (escape)
break;
/*
* If this is the escape character, look at the next character.
*/
if (c == '\\') {
escape = 1;
continue;
}
/*
* If this is the start of a comment, ignore the rest of the line.
*/
if (c == '#') {
comment = 1;
continue;
}
/*
* A non-whitespace character is the start of a word.
*/
if (!isspace(c))
break;
}
/*
* Process characters until the end of the word.
*/
while (c != EOF) {
if (escape) {
/*
* This character is escaped: backslash-newline is ignored,
* various other characters indicate particular values
* as for C backslash-escapes.
*/
escape = 0;
if (c == '\n') {
c = getc(f);
continue;
}
got = 0;
switch (c) {
case 'a':
value = '\a';
break;
case 'b':
value = '\b';
break;
case 'f':
value = '\f';
break;
case 'n':
value = '\n';
break;
case 'r':
value = '\r';
break;
case 's':
value = ' ';
break;
case 't':
value = '\t';
break;
default:
if (isoctal(c)) {
/*
* \ddd octal sequence
*/
value = 0;
for (n = 0; n < 3 && isoctal(c); ++n) {
value = (value << 3) + (c & 07);
c = getc(f);
}
got = 1;
break;
}
if (c == 'x') {
/*
* \x<hex_string> sequence
*/
value = 0;
c = getc(f);
for (n = 0; n < 2 && isxdigit(c); ++n) {
digit = toupper(c) - '0';
if (digit > 10)
digit += '0' + 10 - 'A';
value = (value << 4) + digit;
c = getc (f);
}
got = 1;
break;
}
/*
* Otherwise the character stands for itself.
*/
value = c;
break;
}
/*
* Store the resulting character for the escape sequence.
*/
if (len < MAXWORDLEN) {
word[len] = value;
++len;
}
if (!got)
c = getc(f);
continue;
}
/*
* Backslash starts a new escape sequence.
*/
if (c == '\\') {
escape = 1;
c = getc(f);
continue;
}
/*
* Not escaped: check for the start or end of a quoted
* section and see if we've reached the end of the word.
*/
if (quoted) {
if (c == quoted) {
quoted = 0;
c = getc(f);
continue;
}
} else if (c == '"' || c == '\'') {
quoted = c;
c = getc(f);
continue;
} else if (isspace(c) || c == '#') {
ungetc (c, f);
break;
}
/*
* An ordinary character: store it in the word and get another.
*/
if (len < MAXWORDLEN) {
word[len] = c;
++len;
}
c = getc(f);
}
/*
* End of the word: check for errors.
*/
if (c == EOF) {
if (ferror(f)) {
if (errno == 0)
errno = EIO;
option_error("Error reading %s: %m", filename);
die(1);
}
/*
* If len is zero, then we didn't find a word before the
* end of the file.
*/
if (len == 0)
return 0;
if (quoted)
option_error("warning: quoted word runs to end of file (%.20s...)",
filename, word);
}
/*
* Warn if the word was too long, and append a terminating null.
*/
if (len >= MAXWORDLEN) {
option_error("warning: word in file %s too long (%.20s...)",
filename, word);
len = MAXWORDLEN - 1;
}
word[len] = 0;
return 1;
#undef isoctal
}
/*
* number_option - parse an unsigned numeric parameter for an option.
*/
static int
number_option(str, valp, base)
char *str;
u_int32_t *valp;
int base;
{
char *ptr;
*valp = strtoul(str, &ptr, base);
if (ptr == str) {
option_error("invalid numeric parameter '%s' for %s option",
str, current_option);
return 0;
}
return 1;
}
/*
* int_option - like number_option, but valp is int *,
* the base is assumed to be 0, and *valp is not changed
* if there is an error.
*/
int
int_option(str, valp)
char *str;
int *valp;
{
u_int32_t v;
if (!number_option(str, &v, 0))
return 0;
*valp = (int) v;
return 1;
}
/*
* The following procedures parse options.
*/
/*
* readfile - take commands from a file.
*/
static int
readfile(argv)
char **argv;
{
return options_from_file(*argv, 1, 1, privileged_option);
}
/*
* callfile - take commands from /etc/ppp/peers/<name>.
* Name may not contain /../, start with / or ../, or end in /..
*/
static int
callfile(argv)
char **argv;
{
char *fname, *arg, *p;
int l, ok;
arg = *argv;
ok = 1;
if (arg[0] == '/' || arg[0] == 0)
ok = 0;
else {
for (p = arg; *p != 0; ) {
if (p[0] == '.' && p[1] == '.' && (p[2] == '/' || p[2] == 0)) {
ok = 0;
break;
}
while (*p != '/' && *p != 0)
++p;
if (*p == '/')
++p;
}
}
if (!ok) {
option_error("call option value may not contain .. or start with /");
return 0;
}
l = strlen(arg) + strlen(_PATH_PEERFILES) + 1;
if ((fname = (char *) malloc(l)) == NULL)
novm("call file name");
slprintf(fname, l, "%s%s", _PATH_PEERFILES, arg);
ok = options_from_file(fname, 1, 1, 1);
free(fname);
return ok;
}
#ifdef PPP_FILTER
/*
* setpassfilter - Set the pass filter for packets
*/
static int
setpassfilter(argv)
char **argv;
{
pcap_t *pc;
int ret = 1;
pc = pcap_open_dead(DLT_PPP_PPPD, 65535);
if (pcap_compile(pc, &pass_filter, *argv, 1, netmask) == -1) {
option_error("error in pass-filter expression: %s\n",
pcap_geterr(pc));
ret = 0;
}
pcap_close(pc);
return ret;
}
/*
* setactivefilter - Set the active filter for packets
*/
static int
setactivefilter(argv)
char **argv;
{
pcap_t *pc;
int ret = 1;
pc = pcap_open_dead(DLT_PPP_PPPD, 65535);
if (pcap_compile(pc, &active_filter, *argv, 1, netmask) == -1) {
option_error("error in active-filter expression: %s\n",
pcap_geterr(pc));
ret = 0;
}
pcap_close(pc);
return ret;
}
#endif
/*
* setdomain - Set domain name to append to hostname
*/
static int
setdomain(argv)
char **argv;
{
gethostname(hostname, MAXNAMELEN);
if (**argv != 0) {
if (**argv != '.')
strncat(hostname, ".", MAXNAMELEN - strlen(hostname));
domain = hostname + strlen(hostname);
strncat(hostname, *argv, MAXNAMELEN - strlen(hostname));
}
hostname[MAXNAMELEN-1] = 0;
return (1);
}
static int
setlogfile(argv)
char **argv;
{
int fd, err;
uid_t euid;
euid = geteuid();
if (!privileged_option && seteuid(getuid()) == -1) {
option_error("unable to drop permissions to open %s: %m", *argv);
return 0;
}
fd = open(*argv, O_WRONLY | O_APPEND | O_CREAT | O_EXCL, 0644);
if (fd < 0 && errno == EEXIST)
fd = open(*argv, O_WRONLY | O_APPEND);
err = errno;
if (!privileged_option && seteuid(euid) == -1)
fatal("unable to regain privileges: %m");
if (fd < 0) {
errno = err;
option_error("Can't open log file %s: %m", *argv);
return 0;
}
strlcpy(logfile_name, *argv, sizeof(logfile_name));
if (logfile_fd >= 0)
close(logfile_fd);
logfile_fd = fd;
log_to_fd = fd;
log_default = 0;
return 1;
}
#ifdef MAXOCTETS
static int
setmodir(argv)
char **argv;
{
if(*argv == NULL)
return 0;
if(!strcmp(*argv,"in")) {
maxoctets_dir = PPP_OCTETS_DIRECTION_IN;
} else if (!strcmp(*argv,"out")) {
maxoctets_dir = PPP_OCTETS_DIRECTION_OUT;
} else if (!strcmp(*argv,"max")) {
maxoctets_dir = PPP_OCTETS_DIRECTION_MAXOVERAL;
} else {
maxoctets_dir = PPP_OCTETS_DIRECTION_SUM;
}
return 1;
}
#endif
#ifdef PLUGIN
static int
loadplugin(argv)
char **argv;
{
char *arg = *argv;
void *handle;
const char *err;
void (*init) __P((void));
char *path = arg;
const char *vers;
if (strchr(arg, '/') == 0) {
const char *base = _PATH_PLUGIN;
int l = strlen(base) + strlen(arg) + 2;
path = malloc(l);
if (path == 0)
novm("plugin file path");
strlcpy(path, base, l);
strlcat(path, "/", l);
strlcat(path, arg, l);
}
handle = dlopen(path, RTLD_GLOBAL | RTLD_NOW);
if (handle == 0) {
err = dlerror();
if (err != 0)
option_error("%s", err);
option_error("Couldn't load plugin %s", arg);
goto err;
}
init = (void (*)(void))dlsym(handle, "plugin_init");
if (init == 0) {
option_error("%s has no initialization entry point", arg);
goto errclose;
}
vers = (const char *) dlsym(handle, "pppd_version");
if (vers == 0) {
warn("Warning: plugin %s has no version information", arg);
} else if (strcmp(vers, VERSION) != 0) {
option_error("Plugin %s is for pppd version %s, this is %s",
arg, vers, VERSION);
goto errclose;
}
info("Plugin %s loaded.", arg);
(*init)();
return 1;
errclose:
dlclose(handle);
err:
if (path != arg)
free(path);
return 0;
}
#endif /* PLUGIN */
/*
* Set an environment variable specified by the user.
*/
static int
user_setenv(argv)
char **argv;
{
char *arg = argv[0];
char *eqp;
struct userenv *uep, **insp;
if ((eqp = strchr(arg, '=')) == NULL) {
option_error("missing = in name=value: %s", arg);
return 0;
}
if (eqp == arg) {
option_error("missing variable name: %s", arg);
return 0;
}
for (uep = userenv_list; uep != NULL; uep = uep->ue_next) {
int nlen = strlen(uep->ue_name);
if (nlen == (eqp - arg) &&
strncmp(arg, uep->ue_name, nlen) == 0)
break;
}
/* Ignore attempts by unprivileged users to override privileged sources */
if (uep != NULL && !privileged_option && uep->ue_priv)
return 1;
/* The name never changes, so allocate it with the structure */
if (uep == NULL) {
uep = malloc(sizeof (*uep) + (eqp-arg));
strncpy(uep->ue_name, arg, eqp-arg);
uep->ue_name[eqp-arg] = '\0';
uep->ue_next = NULL;
insp = &userenv_list;
while (*insp != NULL)
insp = &(*insp)->ue_next;
*insp = uep;
} else {
struct userenv *uep2;
for (uep2 = userenv_list; uep2 != NULL; uep2 = uep2->ue_next) {
if (uep2 != uep && !uep2->ue_isset)
break;
}
if (uep2 == NULL && !uep->ue_isset)
find_option("unset")->flags |= OPT_NOPRINT;
free(uep->ue_value);
}
uep->ue_isset = 1;
uep->ue_priv = privileged_option;
uep->ue_source = option_source;
uep->ue_value = strdup(eqp + 1);
curopt->flags &= ~OPT_NOPRINT;
return 1;
}
static void
user_setprint(opt, printer, arg)
option_t *opt;
printer_func printer;
void *arg;
{
struct userenv *uep, *uepnext;
uepnext = userenv_list;
while (uepnext != NULL && !uepnext->ue_isset)
uepnext = uepnext->ue_next;
while ((uep = uepnext) != NULL) {
uepnext = uep->ue_next;
while (uepnext != NULL && !uepnext->ue_isset)
uepnext = uepnext->ue_next;
(*printer)(arg, "%s=%s", uep->ue_name, uep->ue_value);
if (uepnext != NULL)
(*printer)(arg, "\t\t# (from %s)\n%s ", uep->ue_source, opt->name);
else
opt->source = uep->ue_source;
}
}
static int
user_unsetenv(argv)
char **argv;
{
struct userenv *uep, **insp;
char *arg = argv[0];
if (strchr(arg, '=') != NULL) {
option_error("unexpected = in name: %s", arg);
return 0;
}
if (arg == '\0') {
option_error("missing variable name for unset");
return 0;
}
for (uep = userenv_list; uep != NULL; uep = uep->ue_next) {
if (strcmp(arg, uep->ue_name) == 0)
break;
}
/* Ignore attempts by unprivileged users to override privileged sources */
if (uep != NULL && !privileged_option && uep->ue_priv)
return 1;
/* The name never changes, so allocate it with the structure */
if (uep == NULL) {
uep = malloc(sizeof (*uep) + strlen(arg));
strcpy(uep->ue_name, arg);
uep->ue_next = NULL;
insp = &userenv_list;
while (*insp != NULL)
insp = &(*insp)->ue_next;
*insp = uep;
} else {
struct userenv *uep2;
for (uep2 = userenv_list; uep2 != NULL; uep2 = uep2->ue_next) {
if (uep2 != uep && uep2->ue_isset)
break;
}
if (uep2 == NULL && uep->ue_isset)
find_option("set")->flags |= OPT_NOPRINT;
free(uep->ue_value);
}
uep->ue_isset = 0;
uep->ue_priv = privileged_option;
uep->ue_source = option_source;
uep->ue_value = NULL;
curopt->flags &= ~OPT_NOPRINT;
return 1;
}
static void
user_unsetprint(opt, printer, arg)
option_t *opt;
printer_func printer;
void *arg;
{
struct userenv *uep, *uepnext;
uepnext = userenv_list;
while (uepnext != NULL && uepnext->ue_isset)
uepnext = uepnext->ue_next;
while ((uep = uepnext) != NULL) {
uepnext = uep->ue_next;
while (uepnext != NULL && uepnext->ue_isset)
uepnext = uepnext->ue_next;
(*printer)(arg, "%s", uep->ue_name);
if (uepnext != NULL)
(*printer)(arg, "\t\t# (from %s)\n%s ", uep->ue_source, opt->name);
else
opt->source = uep->ue_source;
}
}