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ntp_control.c
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ntp_control.c
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/*
* ntp_control.c - respond to control messages and send async traps
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "ntpd.h"
#include "ntp_io.h"
#include "ntp_refclock.h"
#include "ntp_control.h"
#include "ntp_unixtime.h"
#include "ntp_stdlib.h"
#include "ntp_config.h"
#include "ntp_crypto.h"
#include "ntp_assert.h"
#include <stdio.h>
#include <ctype.h>
#include <signal.h>
#include <sys/stat.h>
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#include <arpa/inet.h>
/*
* Structure to hold request procedure information
*/
struct ctl_proc {
short control_code; /* defined request code */
#define NO_REQUEST (-1)
u_short flags; /* flags word */
/* Only one flag. Authentication required or not. */
#define NOAUTH 0
#define AUTH 1
void (*handler) (struct recvbuf *, int); /* handle request */
};
/*
* Request processing routines
*/
static void ctl_error (int);
#ifdef REFCLOCK
static u_short ctlclkstatus (struct refclockstat *);
#endif
static void ctl_flushpkt (int);
static void ctl_putdata (const char *, unsigned int, int);
static void ctl_putstr (const char *, const char *,
unsigned int);
static void ctl_putdbl (const char *, double);
static void ctl_putuint (const char *, u_long);
static void ctl_puthex (const char *, u_long);
static void ctl_putint (const char *, long);
static void ctl_putts (const char *, l_fp *);
static void ctl_putadr (const char *, u_int32,
sockaddr_u *);
static void ctl_putrefid (const char *, u_int32);
static void ctl_putarray (const char *, double *, int);
static void ctl_putsys (int);
static void ctl_putpeer (int, struct peer *);
static void ctl_putfs (const char *, tstamp_t);
#ifdef REFCLOCK
static void ctl_putclock (int, struct refclockstat *, int);
#endif /* REFCLOCK */
static struct ctl_var *ctl_getitem (struct ctl_var *, char **);
static u_long count_var (struct ctl_var *);
static void control_unspec (struct recvbuf *, int);
static void read_status (struct recvbuf *, int);
static void read_variables (struct recvbuf *, int);
static void write_variables (struct recvbuf *, int);
static void read_clock_status (struct recvbuf *, int);
static void write_clock_status (struct recvbuf *, int);
static void set_trap (struct recvbuf *, int);
static void unset_trap (struct recvbuf *, int);
static void configure (struct recvbuf *, int);
static void save_config (struct recvbuf *, int);
static struct ctl_trap *ctlfindtrap (sockaddr_u *,
struct interface *);
static struct ctl_proc control_codes[] = {
{ CTL_OP_UNSPEC, NOAUTH, control_unspec },
{ CTL_OP_READSTAT, NOAUTH, read_status },
{ CTL_OP_READVAR, NOAUTH, read_variables },
{ CTL_OP_WRITEVAR, AUTH, write_variables },
{ CTL_OP_READCLOCK, NOAUTH, read_clock_status },
{ CTL_OP_WRITECLOCK, NOAUTH, write_clock_status },
{ CTL_OP_SETTRAP, NOAUTH, set_trap },
{ CTL_OP_UNSETTRAP, NOAUTH, unset_trap },
{ CTL_OP_SAVECONFIG, AUTH, save_config },
{ CTL_OP_CONFIGURE, AUTH, configure },
{ NO_REQUEST, 0 }
};
/*
* System variable values. The array can be indexed by the variable
* index to find the textual name.
*/
static struct ctl_var sys_var[] = {
{ 0, PADDING, "" }, /* 0 */
{ CS_LEAP, RW, "leap" }, /* 1 */
{ CS_STRATUM, RO, "stratum" }, /* 2 */
{ CS_PRECISION, RO, "precision" }, /* 3 */
{ CS_ROOTDELAY, RO, "rootdelay" }, /* 4 */
{ CS_ROOTDISPERSION, RO, "rootdisp" }, /* 5 */
{ CS_REFID, RO, "refid" }, /* 6 */
{ CS_REFTIME, RO, "reftime" }, /* 7 */
{ CS_POLL, RO, "tc" }, /* 8 */
{ CS_PEERID, RO, "peer" }, /* 9 */
{ CS_OFFSET, RO, "offset" }, /* 10 */
{ CS_DRIFT, RO, "frequency" }, /* 11 */
{ CS_JITTER, RO, "sys_jitter" }, /* 12 */
{ CS_ERROR, RO, "clk_jitter" }, /* 13 */
{ CS_CLOCK, RO, "clock" }, /* 14 */
{ CS_PROCESSOR, RO, "processor" }, /* 15 */
{ CS_SYSTEM, RO, "system" }, /* 16 */
{ CS_VERSION, RO, "version" }, /* 17 */
{ CS_STABIL, RO, "clk_wander" }, /* 18 */
{ CS_VARLIST, RO, "sys_var_list" }, /* 19 */
{ CS_TAI, RO, "tai" }, /* 20 */
{ CS_LEAPTAB, RO, "leapsec" }, /* 21 */
{ CS_LEAPEND, RO, "expire" }, /* 22 */
{ CS_RATE, RO, "mintc" }, /* 23 */
#ifdef OPENSSL
{ CS_FLAGS, RO, "flags" }, /* 24 */
{ CS_HOST, RO, "host" }, /* 25 */
{ CS_PUBLIC, RO, "update" }, /* 26 */
{ CS_CERTIF, RO, "cert" }, /* 27 */
{ CS_SIGNATURE, RO, "signature" }, /* 28 */
{ CS_REVTIME, RO, "until" }, /* 29 */
{ CS_GROUP, RO, "group" }, /* 30 */
{ CS_DIGEST, RO, "digest" }, /* 31 */
#endif /* OPENSSL */
{ 0, EOV, "" } /* 24/3 2*/
};
static struct ctl_var *ext_sys_var = (struct ctl_var *)0;
/*
* System variables we print by default (in fuzzball order,
* more-or-less)
*/
static u_char def_sys_var[] = {
CS_VERSION,
CS_PROCESSOR,
CS_SYSTEM,
CS_LEAP,
CS_STRATUM,
CS_PRECISION,
CS_ROOTDELAY,
CS_ROOTDISPERSION,
CS_REFID,
CS_REFTIME,
CS_CLOCK,
CS_PEERID,
CS_POLL,
CS_RATE,
CS_OFFSET,
CS_DRIFT,
CS_JITTER,
CS_ERROR,
CS_STABIL,
CS_TAI,
CS_LEAPTAB,
CS_LEAPEND,
#ifdef OPENSSL
CS_HOST,
CS_GROUP,
CS_FLAGS,
CS_DIGEST,
CS_SIGNATURE,
CS_PUBLIC,
CS_CERTIF,
#endif /* OPENSSL */
0
};
/*
* Peer variable list
*/
static struct ctl_var peer_var[] = {
{ 0, PADDING, "" }, /* 0 */
{ CP_CONFIG, RO, "config" }, /* 1 */
{ CP_AUTHENABLE, RO, "authenable" }, /* 2 */
{ CP_AUTHENTIC, RO, "authentic" }, /* 3 */
{ CP_SRCADR, RO, "srcadr" }, /* 4 */
{ CP_SRCPORT, RO, "srcport" }, /* 5 */
{ CP_DSTADR, RO, "dstadr" }, /* 6 */
{ CP_DSTPORT, RO, "dstport" }, /* 7 */
{ CP_LEAP, RO, "leap" }, /* 8 */
{ CP_HMODE, RO, "hmode" }, /* 9 */
{ CP_STRATUM, RO, "stratum" }, /* 10 */
{ CP_PPOLL, RO, "ppoll" }, /* 11 */
{ CP_HPOLL, RO, "hpoll" }, /* 12 */
{ CP_PRECISION, RO, "precision" }, /* 13 */
{ CP_ROOTDELAY, RO, "rootdelay" }, /* 14 */
{ CP_ROOTDISPERSION, RO, "rootdisp" }, /* 15 */
{ CP_REFID, RO, "refid" }, /* 16 */
{ CP_REFTIME, RO, "reftime" }, /* 17 */
{ CP_ORG, RO, "org" }, /* 18 */
{ CP_REC, RO, "rec" }, /* 19 */
{ CP_XMT, RO, "xleave" }, /* 20 */
{ CP_REACH, RO, "reach" }, /* 21 */
{ CP_UNREACH, RO, "unreach" }, /* 22 */
{ CP_TIMER, RO, "timer" }, /* 23 */
{ CP_DELAY, RO, "delay" }, /* 24 */
{ CP_OFFSET, RO, "offset" }, /* 25 */
{ CP_JITTER, RO, "jitter" }, /* 26 */
{ CP_DISPERSION, RO, "dispersion" }, /* 27 */
{ CP_KEYID, RO, "keyid" }, /* 28 */
{ CP_FILTDELAY, RO, "filtdelay=" }, /* 29 */
{ CP_FILTOFFSET, RO, "filtoffset=" }, /* 30 */
{ CP_PMODE, RO, "pmode" }, /* 31 */
{ CP_RECEIVED, RO, "received"}, /* 32 */
{ CP_SENT, RO, "sent" }, /* 33 */
{ CP_FILTERROR, RO, "filtdisp=" }, /* 34 */
{ CP_FLASH, RO, "flash" }, /* 35 */
{ CP_TTL, RO, "ttl" }, /* 36 */
{ CP_VARLIST, RO, "peer_var_list" }, /* 37 */
{ CP_IN, RO, "in" }, /* 38 */
{ CP_OUT, RO, "out" }, /* 39 */
{ CP_RATE, RO, "headway" }, /* 40 */
{ CP_BIAS, RO, "bias" }, /* 41 */
#ifdef OPENSSL
{ CP_FLAGS, RO, "flags" }, /* 42 */
{ CP_HOST, RO, "host" }, /* 43 */
{ CP_VALID, RO, "valid" }, /* 44 */
{ CP_INITSEQ, RO, "initsequence" }, /* 45 */
{ CP_INITKEY, RO, "initkey" }, /* 46 */
{ CP_INITTSP, RO, "timestamp" }, /* 47 */
{ CP_SIGNATURE, RO, "signature" }, /* 48 */
#endif /* OPENSSL */
{ 0, EOV, "" } /* 42/49 */
};
/*
* Peer variables we print by default
*/
static u_char def_peer_var[] = {
CP_SRCADR,
CP_SRCPORT,
CP_DSTADR,
CP_DSTPORT,
CP_OUT,
CP_IN,
CP_LEAP,
CP_STRATUM,
CP_PRECISION,
CP_ROOTDELAY,
CP_ROOTDISPERSION,
CP_REFID,
CP_REFTIME,
CP_REC,
CP_REACH,
CP_UNREACH,
CP_HMODE,
CP_PMODE,
CP_HPOLL,
CP_PPOLL,
CP_RATE,
CP_FLASH,
CP_KEYID,
CP_TTL,
CP_OFFSET,
CP_DELAY,
CP_DISPERSION,
CP_JITTER,
CP_XMT,
CP_BIAS,
CP_FILTDELAY,
CP_FILTOFFSET,
CP_FILTERROR,
#ifdef OPENSSL
CP_HOST,
CP_FLAGS,
CP_SIGNATURE,
CP_VALID,
CP_INITSEQ,
#endif /* OPENSSL */
0
};
#ifdef REFCLOCK
/*
* Clock variable list
*/
static struct ctl_var clock_var[] = {
{ 0, PADDING, "" }, /* 0 */
{ CC_TYPE, RO, "type" }, /* 1 */
{ CC_TIMECODE, RO, "timecode" }, /* 2 */
{ CC_POLL, RO, "poll" }, /* 3 */
{ CC_NOREPLY, RO, "noreply" }, /* 4 */
{ CC_BADFORMAT, RO, "badformat" }, /* 5 */
{ CC_BADDATA, RO, "baddata" }, /* 6 */
{ CC_FUDGETIME1, RO, "fudgetime1" }, /* 7 */
{ CC_FUDGETIME2, RO, "fudgetime2" }, /* 8 */
{ CC_FUDGEVAL1, RO, "stratum" }, /* 9 */
{ CC_FUDGEVAL2, RO, "refid" }, /* 10 */
{ CC_FLAGS, RO, "flags" }, /* 11 */
{ CC_DEVICE, RO, "device" }, /* 12 */
{ CC_VARLIST, RO, "clock_var_list" }, /* 13 */
{ 0, EOV, "" } /* 14 */
};
/*
* Clock variables printed by default
*/
static u_char def_clock_var[] = {
CC_DEVICE,
CC_TYPE, /* won't be output if device = known */
CC_TIMECODE,
CC_POLL,
CC_NOREPLY,
CC_BADFORMAT,
CC_BADDATA,
CC_FUDGETIME1,
CC_FUDGETIME2,
CC_FUDGEVAL1,
CC_FUDGEVAL2,
CC_FLAGS,
0
};
#endif
/*
* System and processor definitions.
*/
#ifndef HAVE_UNAME
# ifndef STR_SYSTEM
# define STR_SYSTEM "UNIX"
# endif
# ifndef STR_PROCESSOR
# define STR_PROCESSOR "unknown"
# endif
static char str_system[] = STR_SYSTEM;
static char str_processor[] = STR_PROCESSOR;
#else
# include <sys/utsname.h>
static struct utsname utsnamebuf;
#endif /* HAVE_UNAME */
/*
* Trap structures. We only allow a few of these, and send a copy of
* each async message to each live one. Traps time out after an hour, it
* is up to the trap receipient to keep resetting it to avoid being
* timed out.
*/
/* ntp_request.c */
struct ctl_trap ctl_trap[CTL_MAXTRAPS];
int num_ctl_traps;
/*
* Type bits, for ctlsettrap() call.
*/
#define TRAP_TYPE_CONFIG 0 /* used by configuration code */
#define TRAP_TYPE_PRIO 1 /* priority trap */
#define TRAP_TYPE_NONPRIO 2 /* nonpriority trap */
/*
* List relating reference clock types to control message time sources.
* Index by the reference clock type. This list will only be used iff
* the reference clock driver doesn't set peer->sstclktype to something
* different than CTL_SST_TS_UNSPEC.
*/
static u_char clocktypes[] = {
CTL_SST_TS_NTP, /* REFCLK_NONE (0) */
CTL_SST_TS_LOCAL, /* REFCLK_LOCALCLOCK (1) */
CTL_SST_TS_UHF, /* deprecated REFCLK_GPS_TRAK (2) */
CTL_SST_TS_HF, /* REFCLK_WWV_PST (3) */
CTL_SST_TS_LF, /* REFCLK_WWVB_SPECTRACOM (4) */
CTL_SST_TS_UHF, /* REFCLK_TRUETIME (5) */
CTL_SST_TS_UHF, /* REFCLK_GOES_TRAK (6) IRIG_AUDIO? */
CTL_SST_TS_HF, /* REFCLK_CHU (7) */
CTL_SST_TS_LF, /* REFCLOCK_PARSE (default) (8) */
CTL_SST_TS_LF, /* REFCLK_GPS_MX4200 (9) */
CTL_SST_TS_UHF, /* REFCLK_GPS_AS2201 (10) */
CTL_SST_TS_UHF, /* REFCLK_GPS_ARBITER (11) */
CTL_SST_TS_UHF, /* REFCLK_IRIG_TPRO (12) */
CTL_SST_TS_ATOM, /* REFCLK_ATOM_LEITCH (13) */
CTL_SST_TS_LF, /* deprecated REFCLK_MSF_EES (14) */
CTL_SST_TS_NTP, /* not used (15) */
CTL_SST_TS_UHF, /* REFCLK_IRIG_BANCOMM (16) */
CTL_SST_TS_UHF, /* REFCLK_GPS_DATU (17) */
CTL_SST_TS_TELEPHONE, /* REFCLK_NIST_ACTS (18) */
CTL_SST_TS_HF, /* REFCLK_WWV_HEATH (19) */
CTL_SST_TS_UHF, /* REFCLK_GPS_NMEA (20) */
CTL_SST_TS_UHF, /* REFCLK_GPS_VME (21) */
CTL_SST_TS_ATOM, /* REFCLK_ATOM_PPS (22) */
CTL_SST_TS_NTP, /* not used (23) */
CTL_SST_TS_NTP, /* not used (24) */
CTL_SST_TS_NTP, /* not used (25) */
CTL_SST_TS_UHF, /* REFCLK_GPS_HP (26) */
CTL_SST_TS_LF, /* REFCLK_ARCRON_MSF (27) */
CTL_SST_TS_UHF, /* REFCLK_SHM (28) */
CTL_SST_TS_UHF, /* REFCLK_PALISADE (29) */
CTL_SST_TS_UHF, /* REFCLK_ONCORE (30) */
CTL_SST_TS_UHF, /* REFCLK_JUPITER (31) */
CTL_SST_TS_LF, /* REFCLK_CHRONOLOG (32) */
CTL_SST_TS_LF, /* REFCLK_DUMBCLOCK (33) */
CTL_SST_TS_LF, /* REFCLK_ULINK (34) */
CTL_SST_TS_LF, /* REFCLK_PCF (35) */
CTL_SST_TS_HF, /* REFCLK_WWV (36) */
CTL_SST_TS_LF, /* REFCLK_FG (37) */
CTL_SST_TS_UHF, /* REFCLK_HOPF_SERIAL (38) */
CTL_SST_TS_UHF, /* REFCLK_HOPF_PCI (39) */
CTL_SST_TS_LF, /* REFCLK_JJY (40) */
CTL_SST_TS_UHF, /* REFCLK_TT560 (41) */
CTL_SST_TS_UHF, /* REFCLK_ZYFER (42) */
CTL_SST_TS_UHF, /* REFCLK_RIPENCC (43) */
CTL_SST_TS_UHF, /* REFCLK_NEOCLOCK4X (44) */
};
/*
* Keyid used for authenticating write requests.
*/
keyid_t ctl_auth_keyid;
/*
* We keep track of the last error reported by the system internally
*/
static u_char ctl_sys_last_event;
static u_char ctl_sys_num_events;
/*
* Statistic counters to keep track of requests and responses.
*/
u_long ctltimereset; /* time stats reset */
u_long numctlreq; /* number of requests we've received */
u_long numctlbadpkts; /* number of bad control packets */
u_long numctlresponses; /* number of resp packets sent with data */
u_long numctlfrags; /* number of fragments sent */
u_long numctlerrors; /* number of error responses sent */
u_long numctltooshort; /* number of too short input packets */
u_long numctlinputresp; /* number of responses on input */
u_long numctlinputfrag; /* number of fragments on input */
u_long numctlinputerr; /* number of input pkts with err bit set */
u_long numctlbadoffset; /* number of input pkts with nonzero offset */
u_long numctlbadversion; /* number of input pkts with unknown version */
u_long numctldatatooshort; /* data too short for count */
u_long numctlbadop; /* bad op code found in packet */
u_long numasyncmsgs; /* number of async messages we've sent */
/*
* Response packet used by these routines. Also some state information
* so that we can handle packet formatting within a common set of
* subroutines. Note we try to enter data in place whenever possible,
* but the need to set the more bit correctly means we occasionally
* use the extra buffer and copy.
*/
static struct ntp_control rpkt;
static u_char res_version;
static u_char res_opcode;
static associd_t res_associd;
static int res_offset;
static u_char * datapt;
static u_char * dataend;
static int datalinelen;
static int datanotbinflag;
static sockaddr_u *rmt_addr;
static struct interface *lcl_inter;
static u_char res_authenticate;
static u_char res_authokay;
static keyid_t res_keyid;
#define MAXDATALINELEN (72)
static u_char res_async; /* set to 1 if this is async trap response */
/*
* Pointers for saving state when decoding request packets
*/
static char *reqpt;
static char *reqend;
/*
* init_control - initialize request data
*/
void
init_control(void)
{
int i;
#ifdef HAVE_UNAME
uname(&utsnamebuf);
#endif /* HAVE_UNAME */
ctl_clr_stats();
ctl_auth_keyid = 0;
ctl_sys_last_event = EVNT_UNSPEC;
ctl_sys_num_events = 0;
num_ctl_traps = 0;
for (i = 0; i < CTL_MAXTRAPS; i++)
ctl_trap[i].tr_flags = 0;
}
/*
* ctl_error - send an error response for the current request
*/
static void
ctl_error(
int errcode
)
{
DPRINTF(3, ("sending control error %d\n", errcode));
/*
* Fill in the fields. We assume rpkt.sequence and rpkt.associd
* have already been filled in.
*/
rpkt.r_m_e_op = (u_char) (CTL_RESPONSE|CTL_ERROR|(res_opcode &
CTL_OP_MASK));
rpkt.status = htons((u_short) ((errcode<<8) & 0xff00));
rpkt.count = 0;
/*
* send packet and bump counters
*/
if (res_authenticate && sys_authenticate) {
int maclen;
maclen = authencrypt(res_keyid, (u_int32 *)&rpkt,
CTL_HEADER_LEN);
sendpkt(rmt_addr, lcl_inter, -2, (struct pkt *)&rpkt,
CTL_HEADER_LEN + maclen);
} else {
sendpkt(rmt_addr, lcl_inter, -3, (struct pkt *)&rpkt,
CTL_HEADER_LEN);
}
numctlerrors++;
}
/*
* save_config - Implements ntpq -c "saveconfig <filename>"
* Writes current configuration including any runtime
* changes by ntpq's :config or config-from-file
*/
void
save_config(
struct recvbuf *rbufp,
int restrict_mask
)
{
char reply[128];
#ifdef SAVECONFIG
char filespec[128];
char filename[128];
char fullpath[512];
const char savedconfig_eq[] = "savedconfig=";
char savedconfig[sizeof(savedconfig_eq) + sizeof(filename)];
time_t now;
int fd;
FILE *fptr;
#endif
if (restrict_mask & RES_NOMODIFY) {
snprintf(reply, sizeof(reply),
"saveconfig prohibited by restrict ... nomodify");
ctl_putdata(reply, strlen(reply), 0);
ctl_flushpkt(0);
msyslog(LOG_NOTICE,
"saveconfig from %s rejected due to nomodify restriction",
stoa(&rbufp->recv_srcadr));
return;
}
#ifdef SAVECONFIG
if (NULL == saveconfigdir) {
snprintf(reply, sizeof(reply),
"saveconfig prohibited, no saveconfigdir configured");
ctl_putdata(reply, strlen(reply), 0);
ctl_flushpkt(0);
msyslog(LOG_NOTICE,
"saveconfig from %s rejected, no saveconfigdir",
stoa(&rbufp->recv_srcadr));
return;
}
if (0 == reqend - reqpt)
return;
strncpy(filespec, reqpt, sizeof(filespec));
filespec[sizeof(filespec) - 1] = '\0';
time(&now);
/*
* allow timestamping of the saved config filename with
* strftime() format such as:
* ntpq -c "saveconfig ntp-%Y%m%d-%H%M%S.conf"
*/
if (0 == strftime(filename, sizeof(filename), filespec,
localtime(&now)))
strncpy(filename, filespec, sizeof(filename));
filename[sizeof(filename) - 1] = '\0';
if (strchr(filename, '\\') || strchr(filename, '/')) {
snprintf(reply, sizeof(reply),
"saveconfig does not allow directory in filename");
ctl_putdata(reply, strlen(reply), 0);
ctl_flushpkt(0);
msyslog(LOG_NOTICE,
"saveconfig with path from %s rejected",
stoa(&rbufp->recv_srcadr));
return;
}
snprintf(fullpath, sizeof(fullpath), "%s%s",
saveconfigdir, filename);
fd = open(fullpath, O_CREAT | O_TRUNC | O_WRONLY,
S_IRUSR | S_IWUSR);
if (-1 == fd)
fptr = NULL;
else
fptr = fdopen(fd, "w");
if (NULL == fptr || -1 == dump_all_config_trees(fptr, 1)) {
snprintf(reply, sizeof(reply),
"Unable to save configuration to file %s",
filename);
msyslog(LOG_ERR,
"saveconfig %s from %s failed", filename,
stoa(&rbufp->recv_srcadr));
} else {
snprintf(reply, sizeof(reply),
"Configuration saved to %s", filename);
msyslog(LOG_NOTICE,
"Configuration saved to %s (requested by %s)",
fullpath, stoa(&rbufp->recv_srcadr));
/*
* save the output filename in system variable
* savedconfig, retrieved with:
* ntpq -c "rv 0 savedconfig"
*/
snprintf(savedconfig, sizeof(savedconfig), "%s%s",
savedconfig_eq, filename);
set_sys_var(savedconfig, strlen(savedconfig) + 1, RO);
}
if (NULL != fptr)
fclose(fptr);
#else /* !SAVECONFIG follows */
snprintf(reply, sizeof(reply),
"saveconfig unavailable, configured with --disable-saveconfig");
#endif
ctl_putdata(reply, strlen(reply), 0);
ctl_flushpkt(0);
}
/*
* process_control - process an incoming control message
*/
void
process_control(
struct recvbuf *rbufp,
int restrict_mask
)
{
register struct ntp_control *pkt;
register int req_count;
register int req_data;
register struct ctl_proc *cc;
int properlen;
int maclen;
DPRINTF(3, ("in process_control()\n"));
/*
* Save the addresses for error responses
*/
numctlreq++;
rmt_addr = &rbufp->recv_srcadr;
lcl_inter = rbufp->dstadr;
pkt = (struct ntp_control *)&rbufp->recv_pkt;
/*
* If the length is less than required for the header, or
* it is a response or a fragment, ignore this.
*/
if (rbufp->recv_length < CTL_HEADER_LEN
|| pkt->r_m_e_op & (CTL_RESPONSE|CTL_MORE|CTL_ERROR)
|| pkt->offset != 0) {
DPRINTF(1, ("invalid format in control packet\n"));
if (rbufp->recv_length < CTL_HEADER_LEN)
numctltooshort++;
if (pkt->r_m_e_op & CTL_RESPONSE)
numctlinputresp++;
if (pkt->r_m_e_op & CTL_MORE)
numctlinputfrag++;
if (pkt->r_m_e_op & CTL_ERROR)
numctlinputerr++;
if (pkt->offset != 0)
numctlbadoffset++;
return;
}
res_version = PKT_VERSION(pkt->li_vn_mode);
if (res_version > NTP_VERSION || res_version < NTP_OLDVERSION) {
DPRINTF(1, ("unknown version %d in control packet\n",
res_version));
numctlbadversion++;
return;
}
/*
* Pull enough data from the packet to make intelligent
* responses
*/
rpkt.li_vn_mode = PKT_LI_VN_MODE(sys_leap, res_version,
MODE_CONTROL);
res_opcode = pkt->r_m_e_op;
rpkt.sequence = pkt->sequence;
rpkt.associd = pkt->associd;
rpkt.status = 0;
res_offset = 0;
res_associd = htons(pkt->associd);
res_async = 0;
res_authenticate = 0;
res_keyid = 0;
res_authokay = 0;
req_count = (int)ntohs(pkt->count);
datanotbinflag = 0;
datalinelen = 0;
datapt = rpkt.data;
dataend = &(rpkt.data[CTL_MAX_DATA_LEN]);
if ((rbufp->recv_length & 0x3) != 0)
DPRINTF(3, ("Control packet length %d unrounded\n",
rbufp->recv_length));
/*
* We're set up now. Make sure we've got at least enough
* incoming data space to match the count.
*/
req_data = rbufp->recv_length - CTL_HEADER_LEN;
if (req_data < req_count || rbufp->recv_length & 0x3) {
ctl_error(CERR_BADFMT);
numctldatatooshort++;
return;
}
properlen = req_count + CTL_HEADER_LEN;
/* round up proper len to a 8 octet boundary */
properlen = (properlen + 7) & ~7;
maclen = rbufp->recv_length - properlen;
if ((rbufp->recv_length & 3) == 0 &&
maclen >= MIN_MAC_LEN && maclen <= MAX_MAC_LEN &&
sys_authenticate) {
res_authenticate = 1;
res_keyid = ntohl(*(u_int32 *)((u_char *)pkt +
properlen));
DPRINTF(3, ("recv_len %d, properlen %d, wants auth with keyid %08x, MAC length=%d\n",
rbufp->recv_length, properlen, res_keyid,
maclen));
if (!authistrusted(res_keyid))
DPRINTF(3, ("invalid keyid %08x\n", res_keyid));
else if (authdecrypt(res_keyid, (u_int32 *)pkt,
rbufp->recv_length - maclen,
maclen)) {
DPRINTF(3, ("authenticated okay\n"));
res_authokay = 1;
} else {
DPRINTF(3, ("authentication failed\n"));
res_keyid = 0;
}
}
/*
* Set up translate pointers
*/
reqpt = (char *)pkt->data;
reqend = reqpt + req_count;
/*
* Look for the opcode processor
*/
for (cc = control_codes; cc->control_code != NO_REQUEST; cc++) {
if (cc->control_code == res_opcode) {
DPRINTF(3, ("opcode %d, found command handler\n",
res_opcode));
if (cc->flags == AUTH
&& (!res_authokay
|| res_keyid != ctl_auth_keyid)) {
ctl_error(CERR_PERMISSION);
return;
}
(cc->handler)(rbufp, restrict_mask);
return;
}
}
/*
* Can't find this one, return an error.
*/
numctlbadop++;
ctl_error(CERR_BADOP);
return;
}
/*
* ctlpeerstatus - return a status word for this peer
*/
u_short
ctlpeerstatus(
register struct peer *peer
)
{
u_short status;
status = peer->status;
if (!(peer->flags & FLAG_PREEMPT))
status |= CTL_PST_CONFIG;
if (peer->keyid != 0)
status |= CTL_PST_AUTHENABLE;
if (peer->flags & FLAG_AUTHENTIC)
status |= CTL_PST_AUTHENTIC;
if (peer->reach != 0)
status |= CTL_PST_REACH;
if (peer->cast_flags & (MDF_BCAST | MDF_MCAST | MDF_ACAST))
status |= CTL_PST_BCAST;
return (u_short)CTL_PEER_STATUS(status, peer->num_events,
peer->last_event);
}
/*
* ctlclkstatus - return a status word for this clock
*/
#ifdef REFCLOCK
static u_short
ctlclkstatus(
struct refclockstat *this_clock
)
{
return (u_short)CTL_PEER_STATUS(0, this_clock->lastevent,
this_clock->currentstatus);
}
#endif
/*
* ctlsysstatus - return the system status word
*/
u_short
ctlsysstatus(void)
{
register u_char this_clock;
this_clock = CTL_SST_TS_UNSPEC;
#ifdef REFCLOCK
if (sys_peer != 0) {
if (sys_peer->sstclktype != CTL_SST_TS_UNSPEC) {
this_clock = sys_peer->sstclktype;
} else {
if (sys_peer->refclktype < sizeof(clocktypes))
this_clock =
clocktypes[sys_peer->refclktype];
}
}
#else /* REFCLOCK */
if (sys_peer != 0)
this_clock = CTL_SST_TS_NTP;
#endif /* REFCLOCK */
return (u_short)CTL_SYS_STATUS(sys_leap, this_clock,
ctl_sys_num_events, ctl_sys_last_event);
}
/*
* ctl_flushpkt - write out the current packet and prepare
* another if necessary.
*/
static void
ctl_flushpkt(
int more
)
{
int dlen;
int sendlen;
if (!more && datanotbinflag) {
/*
* Big hack, output a trailing \r\n
*/
*datapt++ = '\r';
*datapt++ = '\n';
}
dlen = datapt - (u_char *)rpkt.data;
sendlen = dlen + CTL_HEADER_LEN;
/*
* Pad to a multiple of 32 bits
*/
while (sendlen & 0x3) {
*datapt++ = '\0';
sendlen++;
}
/*
* Fill in the packet with the current info
*/
rpkt.r_m_e_op = (u_char)(CTL_RESPONSE|more|(res_opcode &
CTL_OP_MASK));
rpkt.count = htons((u_short) dlen);
rpkt.offset = htons( (u_short) res_offset);
if (res_async) {
register int i;
for (i = 0; i < CTL_MAXTRAPS; i++) {
if (ctl_trap[i].tr_flags & TRAP_INUSE) {
rpkt.li_vn_mode =
PKT_LI_VN_MODE(sys_leap,
ctl_trap[i].tr_version,
MODE_CONTROL);
rpkt.sequence =
htons(ctl_trap[i].tr_sequence);
sendpkt(&ctl_trap[i].tr_addr,
ctl_trap[i].tr_localaddr, -4,
(struct pkt *)&rpkt, sendlen);
if (!more)
ctl_trap[i].tr_sequence++;
numasyncmsgs++;
}
}
} else {
if (res_authenticate && sys_authenticate) {
int maclen;
int totlen = sendlen;
keyid_t keyid = htonl(res_keyid);
/*
* If we are going to authenticate, then there
* is an additional requirement that the MAC
* begin on a 64 bit boundary.
*/
while (totlen & 7) {
*datapt++ = '\0';
totlen++;
}
memcpy(datapt, &keyid, sizeof keyid);
maclen = authencrypt(res_keyid,
(u_int32 *)&rpkt, totlen);
sendpkt(rmt_addr, lcl_inter, -5,
(struct pkt *)&rpkt, totlen + maclen);
} else {
sendpkt(rmt_addr, lcl_inter, -6,
(struct pkt *)&rpkt, sendlen);
}
if (more)
numctlfrags++;
else
numctlresponses++;
}
/*
* Set us up for another go around.
*/
res_offset += dlen;
datapt = (u_char *)rpkt.data;
}
/*
* ctl_putdata - write data into the packet, fragmenting and starting
* another if this one is full.
*/
static void
ctl_putdata(
const char *dp,
unsigned int dlen,
int bin /* set to 1 when data is binary */
)
{
int overhead;
overhead = 0;
if (!bin) {