From 74a4d8c26dd3c1e9febcb717cfd6cb6512991a7a Mon Sep 17 00:00:00 2001
From: "Charles.Forsyth" <devnull@localhost>
Date: Fri, 22 Dec 2006 21:39:35 +0000
Subject: 20060303

---
 os/ip/netlog.c | 263 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 263 insertions(+)
 create mode 100644 os/ip/netlog.c

(limited to 'os/ip/netlog.c')

diff --git a/os/ip/netlog.c b/os/ip/netlog.c
new file mode 100644
index 00000000..3ee200fe
--- /dev/null
+++ b/os/ip/netlog.c
@@ -0,0 +1,263 @@
+#include	"u.h"
+#include	"../port/lib.h"
+#include	"mem.h"
+#include	"dat.h"
+#include	"fns.h"
+#include	"../port/error.h"
+#include	"../ip/ip.h"
+
+enum {
+	Nlog		= 4*1024,
+};
+
+/*
+ *  action log
+ */
+struct Netlog {
+	Lock;
+	int	opens;
+	char*	buf;
+	char	*end;
+	char	*rptr;
+	int	len;
+
+	int	logmask;			/* mask of things to debug */
+	uchar	iponly[IPaddrlen];		/* ip address to print debugging for */
+	int	iponlyset;
+
+	QLock;
+	Rendez;
+};
+
+typedef struct Netlogflag {
+	char*	name;
+	int	mask;
+} Netlogflag;
+
+static Netlogflag flags[] =
+{
+	{ "ppp",	Logppp, },
+	{ "ip",		Logip, },
+	{ "fs",		Logfs, },
+	{ "tcp",	Logtcp, },
+	{ "il",		Logil, },
+	{ "icmp",	Logicmp, },
+	{ "udp",	Logudp, },
+	{ "compress",	Logcompress, },
+	{ "ilmsg",	Logil|Logilmsg, },
+	{ "gre",	Loggre, },
+	{ "tcpwin",	Logtcp|Logtcpwin, },
+	{ "tcprxmt",	Logtcp|Logtcprxmt, },
+	{ "udpmsg",	Logudp|Logudpmsg, },
+	{ "ipmsg",	Logip|Logipmsg, },
+	{ "esp",	Logesp, },
+	{ nil,		0, },
+};
+
+char Ebadnetctl[] = "too few arguments for netlog control message";
+
+enum
+{
+	CMset,
+	CMclear,
+	CMonly,
+};
+
+static
+Cmdtab routecmd[] = {
+	CMset,		"set",		0,
+	CMclear,	"clear",	0,
+	CMonly,		"only",		0,
+};
+
+void
+netloginit(Fs *f)
+{
+	f->alog = smalloc(sizeof(Netlog));
+}
+
+void
+netlogopen(Fs *f)
+{
+	lock(f->alog);
+	if(waserror()){
+		unlock(f->alog);
+		nexterror();
+	}
+	if(f->alog->opens == 0){
+		if(f->alog->buf == nil)
+			f->alog->buf = malloc(Nlog);
+		f->alog->rptr = f->alog->buf;
+		f->alog->end = f->alog->buf + Nlog;
+	}
+	f->alog->opens++;
+	unlock(f->alog);
+	poperror();
+}
+
+void
+netlogclose(Fs *f)
+{
+	lock(f->alog);
+	if(waserror()){
+		unlock(f->alog);
+		nexterror();
+	}
+	f->alog->opens--;
+	if(f->alog->opens == 0){
+		free(f->alog->buf);
+		f->alog->buf = nil;
+	}
+	unlock(f->alog);
+	poperror();
+}
+
+static int
+netlogready(void *a)
+{
+	Fs *f = a;
+
+	return f->alog->len;
+}
+
+long
+netlogread(Fs *f, void *a, ulong, long n)
+{
+	int i, d;
+	char *p, *rptr;
+
+	qlock(f->alog);
+	if(waserror()){
+		qunlock(f->alog);
+		nexterror();
+	}
+
+	for(;;){
+		lock(f->alog);
+		if(f->alog->len){
+			if(n > f->alog->len)
+				n = f->alog->len;
+			d = 0;
+			rptr = f->alog->rptr;
+			f->alog->rptr += n;
+			if(f->alog->rptr >= f->alog->end){
+				d = f->alog->rptr - f->alog->end;
+				f->alog->rptr = f->alog->buf + d;
+			}
+			f->alog->len -= n;
+			unlock(f->alog);
+
+			i = n-d;
+			p = a;
+			memmove(p, rptr, i);
+			memmove(p+i, f->alog->buf, d);
+			break;
+		}
+		else
+			unlock(f->alog);
+
+		sleep(f->alog, netlogready, f);
+	}
+
+	qunlock(f->alog);
+	poperror();
+
+	return n;
+}
+
+void
+netlogctl(Fs *f, char* s, int n)
+{
+	int i, set;
+	Netlogflag *fp;
+	Cmdbuf *cb;
+	Cmdtab *ct;
+
+	cb = parsecmd(s, n);
+	if(waserror()){
+		free(cb);
+		nexterror();
+	}
+
+	if(cb->nf < 2)
+		error(Ebadnetctl);
+
+	ct = lookupcmd(cb, routecmd, nelem(routecmd));
+
+	SET(set);
+
+	switch(ct->index){
+	case CMset:
+		set = 1;
+		break;
+
+	case CMclear:
+		set = 0;
+		break;
+
+	case CMonly:
+		parseip(f->alog->iponly, cb->f[1]);
+		if(ipcmp(f->alog->iponly, IPnoaddr) == 0)
+			f->alog->iponlyset = 0;
+		else
+			f->alog->iponlyset = 1;
+		free(cb);
+		return;
+
+	default:
+		cmderror(cb, "unknown ip control message");
+	}
+
+	for(i = 1; i < cb->nf; i++){
+		for(fp = flags; fp->name; fp++)
+			if(strcmp(fp->name, cb->f[i]) == 0)
+				break;
+		if(fp->name == nil)
+			continue;
+		if(set)
+			f->alog->logmask |= fp->mask;
+		else
+			f->alog->logmask &= ~fp->mask;
+	}
+
+	free(cb);
+	poperror();
+}
+
+void
+netlog(Fs *f, int mask, char *fmt, ...)
+{
+	char buf[128], *t, *fp;
+	int i, n;
+	va_list arg;
+
+	if(!(f->alog->logmask & mask))
+		return;
+
+	if(f->alog->opens == 0)
+		return;
+
+	va_start(arg, fmt);
+	n = vseprint(buf, buf+sizeof(buf), fmt, arg) - buf;
+	va_end(arg);
+
+	lock(f->alog);
+	i = f->alog->len + n - Nlog;
+	if(i > 0){
+		f->alog->len -= i;
+		f->alog->rptr += i;
+		if(f->alog->rptr >= f->alog->end)
+			f->alog->rptr = f->alog->buf + (f->alog->rptr - f->alog->end);
+	}
+	t = f->alog->rptr + f->alog->len;
+	fp = buf;
+	f->alog->len += n;
+	while(n-- > 0){
+		if(t >= f->alog->end)
+			t = f->alog->buf + (t - f->alog->end);
+		*t++ = *fp++;
+	}
+	unlock(f->alog);
+
+	wakeup(f->alog);
+}
-- 
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