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Add LogFILTER logging to log packets allowed by the dial filter and

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dropped by any filter.

Submitted by: Mark Hannon <markhannon@one.net.au>

with some small tweaks by me.
This commit is contained in:
Brian Somers 2000-08-28 23:24:52 +00:00
parent 08945429b9
commit 06a43ce058
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=65181
5 changed files with 83 additions and 28 deletions
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73
usr.sbin/ppp/ip.c
View File

@ -169,7 +169,7 @@ FilterCheck(const struct ip *pip, const struct filter *filter, unsigned *psecs)
int didname; /* true if filter header printed */
int match; /* true if condition matched */
const struct filterent *fp = filter->rule;
char dbuff[100];
char dbuff[100], dstip[16];
if (fp->f_action == A_NONE)
return 0; /* No rule is given. Permit this packet */
@ -184,10 +184,16 @@ FilterCheck(const struct ip *pip, const struct filter *filter, unsigned *psecs)
*/
len = ntohs(pip->ip_off) & IP_OFFMASK; /* fragment offset */
if (len > 0) { /* Not first fragment within datagram */
if (len < (24 >> 3)) /* don't allow fragment to over-write header */
if (len < (24 >> 3)) { /* don't allow fragment to over-write header */
log_Printf(LogFILTER, " error: illegal header\n");
return 1;
}
/* permit fragments on in and out filter */
return !filter->fragok;
if (!filter->fragok) {
log_Printf(LogFILTER, " error: illegal fragmentation\n");
return 1;
} else
return 0;
}
cproto = gotinfo = estab = syn = finrst = didname = 0;
@ -221,8 +227,11 @@ FilterCheck(const struct ip *pip, const struct filter *filter, unsigned *psecs)
switch (pip->ip_p) {
case IPPROTO_ICMP:
cproto = P_ICMP;
if (datalen < 8) /* ICMP must be at least 8 octets */
if (datalen < 8) { /* ICMP must be at least 8 octets */
log_Printf(LogFILTER, " error: ICMP must be at least 8 octets\n");
return 1;
}
ih = (const struct icmp *) ptop;
sport = ih->icmp_type;
estab = syn = finrst = -1;
@ -231,16 +240,20 @@ FilterCheck(const struct ip *pip, const struct filter *filter, unsigned *psecs)
break;
case IPPROTO_IGMP:
cproto = P_IGMP;
if (datalen < 8) /* IGMP uses 8-octet messages */
if (datalen < 8) { /* IGMP uses 8-octet messages */
log_Printf(LogFILTER, " error: IGMP must be at least 8 octets\n");
return 1;
}
estab = syn = finrst = -1;
sport = ntohs(0);
break;
#ifdef IPPROTO_GRE
case IPPROTO_GRE:
cproto = P_GRE;
if (datalen < 2) /* GRE uses 2-octet+ messages */
if (datalen < 2) { /* GRE uses 2-octet+ messages */
log_Printf(LogFILTER, " error: GRE must be at least 2 octets\n");
return 1;
}
estab = syn = finrst = -1;
sport = ntohs(0);
break;
@ -248,8 +261,10 @@ FilterCheck(const struct ip *pip, const struct filter *filter, unsigned *psecs)
#ifdef IPPROTO_OSPFIGP
case IPPROTO_OSPFIGP:
cproto = P_OSPF;
if (datalen < 8) /* IGMP uses 8-octet messages */
if (datalen < 8) { /* IGMP uses 8-octet messages */
log_Printf(LogFILTER, " error: IGMP must be at least 8 octets\n");
return 1;
}
estab = syn = finrst = -1;
sport = ntohs(0);
break;
@ -257,8 +272,11 @@ FilterCheck(const struct ip *pip, const struct filter *filter, unsigned *psecs)
case IPPROTO_UDP:
case IPPROTO_IPIP:
cproto = P_UDP;
if (datalen < 8) /* UDP header is 8 octets */
if (datalen < 8) { /* UDP header is 8 octets */
log_Printf(LogFILTER, " error: UDP must be at least 8 octets\n");
return 1;
}
uh = (const struct udphdr *) ptop;
sport = ntohs(uh->uh_sport);
dport = ntohs(uh->uh_dport);
@ -274,8 +292,10 @@ FilterCheck(const struct ip *pip, const struct filter *filter, unsigned *psecs)
* ensures that the TCP header length isn't de-referenced if
* the datagram is too short
*/
if (datalen < 20 || datalen < (th->th_off << 2))
if (datalen < 20 || datalen < (th->th_off << 2)) {
log_Printf(LogFILTER, " error: TCP header incorrect\n");
return 1;
}
sport = ntohs(th->th_sport);
dport = ntohs(th->th_dport);
estab = (th->th_flags & TH_ACK);
@ -291,6 +311,7 @@ FilterCheck(const struct ip *pip, const struct filter *filter, unsigned *psecs)
}
break;
default:
log_Printf(LogFILTER, " error: unknown protocol\n");
return 1; /* We'll block unknown type of packet */
}
@ -350,18 +371,46 @@ FilterCheck(const struct ip *pip, const struct filter *filter, unsigned *psecs)
/* Take specified action */
if (fp->f_action < A_NONE)
fp = &filter->rule[n = fp->f_action];
else
else {
if (fp->f_action == A_PERMIT) {
if (psecs != NULL)
*psecs = fp->timeout;
if (strcmp(filter->name, "DIAL") == 0) {
/* If dial filter then even print out accept packets */
if (log_IsKept(LogFILTER)) {
snprintf(dstip, sizeof dstip, "%s", inet_ntoa(pip->ip_dst));
log_Printf(LogFILTER, "%sbound rule = %d accept %s "
"src = %s/%d dst = %s/%d\n",
filter->name, n, filter_Proto2Nam(cproto),
inet_ntoa(pip->ip_src), sport, dstip, dport);
}
}
return 0;
} else
return 1;
} else {
if (log_IsKept(LogFILTER)) {
snprintf(dstip, sizeof dstip, "%s", inet_ntoa(pip->ip_dst));
log_Printf(LogFILTER,
"%sbound rule = %d deny %s src = %s/%d dst = %s/%d\n",
filter->name, n, filter_Proto2Nam(cproto),
inet_ntoa(pip->ip_src), sport, dstip, dport);
}
return 1;
} /* Explict math. Deny this packet */
}
} else {
n++;
fp++;
}
}
if (log_IsKept(LogFILTER)) {
snprintf(dstip, sizeof dstip, "%s", inet_ntoa(pip->ip_dst));
log_Printf(LogFILTER,
"%sbound rule = implicit deny %s src = %s/%d dst = %s/%d\n",
filter->name, filter_Proto2Nam(cproto),
inet_ntoa(pip->ip_src), sport, dstip, dport);
}
return 1; /* No rule is mached. Deny this packet */
}

1
usr.sbin/ppp/log.c
View File

@ -51,6 +51,7 @@ static const char * const LogNames[] = {
"Connect",
"Debug",
"DNS",
"Filter", /* Log discarded packets */
"HDLC",
"ID0",
"IPCP",

33
usr.sbin/ppp/log.h
View File

@ -35,23 +35,24 @@
#define LogCONNECT (6)
#define LogDEBUG (7) /* syslog(LOG_DEBUG, ....) */
#define LogDNS (8)
#define LogHDLC (9)
#define LogID0 (10)
#define LogIPCP (11)
#define LogLCP (12)
#define LogLQM (13)
#define LogPHASE (14)
#define LogPHYSICAL (15) /* syslog(LOG_INFO, ....) */
#define LogSYNC (16) /* syslog(LOG_INFO, ....) */
#define LogTCPIP (17)
#define LogTIMER (18) /* syslog(LOG_DEBUG, ....) */
#define LogTUN (19) /* If set, tun%d is output with each message */
#define LogWARN (20) /* Sent to VarTerm else syslog(LOG_WARNING, ) */
#define LogERROR (21) /* syslog(LOG_ERR, ....), + sent to VarTerm */
#define LogALERT (22) /* syslog(LOG_ALERT, ....) */
#define LogFILTER (9)
#define LogHDLC (10)
#define LogID0 (11)
#define LogIPCP (12)
#define LogLCP (13)
#define LogLQM (14)
#define LogPHASE (15)
#define LogPHYSICAL (16) /* syslog(LOG_INFO, ....) */
#define LogSYNC (17) /* syslog(LOG_INFO, ....) */
#define LogTCPIP (18)
#define LogTIMER (19) /* syslog(LOG_DEBUG, ....) */
#define LogTUN (20) /* If set, tun%d is output with each message */
#define LogWARN (21) /* Sent to VarTerm else syslog(LOG_WARNING, ) */
#define LogERROR (22) /* syslog(LOG_ERR, ....), + sent to VarTerm */
#define LogALERT (23) /* syslog(LOG_ALERT, ....) */
#define LogMAXCONF (19)
#define LogMAX (22)
#define LogMAXCONF (20)
#define LogMAX (24)
struct mbuf;
struct cmdargs;

2
usr.sbin/ppp/ppp.8
View File

@ -2166,6 +2166,8 @@ Log Chat lines containing the string "CONNECT".
Log debug information.
.It Li DNS
Log DNS QUERY packets.
.It Li Filter
Log packets permitted by the dial filter and denied by any filter.
.It Li HDLC
Dump HDLC packet in hex.
.It Li ID0

2
usr.sbin/ppp/ppp.8.m4
View File

@ -2166,6 +2166,8 @@ Log Chat lines containing the string "CONNECT".
Log debug information.
.It Li DNS
Log DNS QUERY packets.
.It Li Filter
Log packets permitted by the dial filter and denied by any filter.
.It Li HDLC
Dump HDLC packet in hex.
.It Li ID0