1 b8c14089 2003-11-23 devnull #include <u.h>
  2 b8c14089 2003-11-23 devnull #include <libc.h>
  3 b8c14089 2003-11-23 devnull #include <bio.h>
  4 b8c14089 2003-11-23 devnull #include <regexp.h>
  5 b8c14089 2003-11-23 devnull #include <thread.h>
  6 b8c14089 2003-11-23 devnull #include <fcall.h>
  7 b8c14089 2003-11-23 devnull #include <plumb.h>
  8 b8c14089 2003-11-23 devnull #include "plumber.h"
  9 b8c14089 2003-11-23 devnull 
 10 b8c14089 2003-11-23 devnull enum
 11 b8c14089 2003-11-23 devnull {
 12 32f69c36 2003-12-11 devnull 	Stack = 32*1024
 13 b8c14089 2003-11-23 devnull };
 14 b8c14089 2003-11-23 devnull 
 15 b8c14089 2003-11-23 devnull typedef struct Dirtab Dirtab;
 16 b8c14089 2003-11-23 devnull typedef struct Fid Fid;
 17 b8c14089 2003-11-23 devnull typedef struct Holdq Holdq;
 18 b8c14089 2003-11-23 devnull typedef struct Readreq Readreq;
 19 b8c14089 2003-11-23 devnull typedef struct Sendreq Sendreq;
 20 b8c14089 2003-11-23 devnull 
 21 b8c14089 2003-11-23 devnull struct Dirtab
 22 b8c14089 2003-11-23 devnull {
 23 b8c14089 2003-11-23 devnull 	char		*name;
 24 b8c14089 2003-11-23 devnull 	uchar	type;
 25 b8c14089 2003-11-23 devnull 	uint		qid;
 26 b8c14089 2003-11-23 devnull 	uint		perm;
 27 b8c14089 2003-11-23 devnull 	int		nopen;		/* #fids open on this port */
 28 b8c14089 2003-11-23 devnull 	Fid		*fopen;
 29 b8c14089 2003-11-23 devnull 	Holdq	*holdq;
 30 b8c14089 2003-11-23 devnull 	Readreq	*readq;
 31 b8c14089 2003-11-23 devnull 	Sendreq	*sendq;
 32 b8c14089 2003-11-23 devnull };
 33 b8c14089 2003-11-23 devnull 
 34 b8c14089 2003-11-23 devnull struct Fid
 35 b8c14089 2003-11-23 devnull {
 36 b8c14089 2003-11-23 devnull 	int		fid;
 37 b8c14089 2003-11-23 devnull 	int		busy;
 38 b8c14089 2003-11-23 devnull 	int		open;
 39 b8c14089 2003-11-23 devnull 	int		mode;
 40 b8c14089 2003-11-23 devnull 	Qid		qid;
 41 b8c14089 2003-11-23 devnull 	Dirtab	*dir;
 42 b8c14089 2003-11-23 devnull 	long		offset;		/* zeroed at beginning of each message, read or write */
 43 b8c14089 2003-11-23 devnull 	char		*writebuf;		/* partial message written so far; offset tells how much */
 44 b8c14089 2003-11-23 devnull 	Fid		*next;
 45 b8c14089 2003-11-23 devnull 	Fid		*nextopen;
 46 b8c14089 2003-11-23 devnull };
 47 b8c14089 2003-11-23 devnull 
 48 b8c14089 2003-11-23 devnull struct Readreq
 49 b8c14089 2003-11-23 devnull {
 50 b8c14089 2003-11-23 devnull 	Fid		*fid;
 51 b8c14089 2003-11-23 devnull 	Fcall		*fcall;
 52 b8c14089 2003-11-23 devnull 	uchar	*buf;
 53 b8c14089 2003-11-23 devnull 	Readreq	*next;
 54 b8c14089 2003-11-23 devnull };
 55 b8c14089 2003-11-23 devnull 
 56 b8c14089 2003-11-23 devnull struct Sendreq
 57 b8c14089 2003-11-23 devnull {
 58 b8c14089 2003-11-23 devnull 	int			nfid;		/* number of fids that should receive this message */
 59 b8c14089 2003-11-23 devnull 	int			nleft;		/* number left that haven't received it */
 60 b8c14089 2003-11-23 devnull 	Fid			**fid;	/* fid[nfid] */
 61 b8c14089 2003-11-23 devnull 	Plumbmsg	*msg;
 62 b8c14089 2003-11-23 devnull 	char			*pack;	/* plumbpack()ed message */
 63 b8c14089 2003-11-23 devnull 	int			npack;	/* length of pack */
 64 b8c14089 2003-11-23 devnull 	Sendreq		*next;
 65 b8c14089 2003-11-23 devnull };
 66 b8c14089 2003-11-23 devnull 
 67 b8c14089 2003-11-23 devnull struct Holdq
 68 b8c14089 2003-11-23 devnull {
 69 b8c14089 2003-11-23 devnull 	Plumbmsg	*msg;
 70 b8c14089 2003-11-23 devnull 	Holdq		*next;
 71 b8c14089 2003-11-23 devnull };
 72 b8c14089 2003-11-23 devnull 
 73 b8c14089 2003-11-23 devnull struct	/* needed because incref() doesn't return value */
 74 b8c14089 2003-11-23 devnull {
 75 32f69c36 2003-12-11 devnull 	Lock	lk;
 76 32f69c36 2003-12-11 devnull 	int	ref;
 77 b8c14089 2003-11-23 devnull } rulesref;
 78 b8c14089 2003-11-23 devnull 
 79 b8c14089 2003-11-23 devnull enum
 80 b8c14089 2003-11-23 devnull {
 81 b8c14089 2003-11-23 devnull 	NDIR	= 50,
 82 b8c14089 2003-11-23 devnull 	Nhash	= 16,
 83 b8c14089 2003-11-23 devnull 
 84 b8c14089 2003-11-23 devnull 	Qdir		= 0,
 85 b8c14089 2003-11-23 devnull 	Qrules	= 1,
 86 b8c14089 2003-11-23 devnull 	Qsend	= 2,
 87 b8c14089 2003-11-23 devnull 	Qport	= 3,
 88 b8c14089 2003-11-23 devnull 	NQID	= Qport
 89 b8c14089 2003-11-23 devnull };
 90 b8c14089 2003-11-23 devnull 
 91 b8c14089 2003-11-23 devnull static Dirtab dir[NDIR] =
 92 b8c14089 2003-11-23 devnull {
 93 b8c14089 2003-11-23 devnull 	{ ".",			QTDIR,	Qdir,			0500|DMDIR },
 94 b8c14089 2003-11-23 devnull 	{ "rules",		QTFILE,	Qrules,		0600 },
 95 cbeb0b26 2006-04-01 devnull 	{ "send",		QTFILE,	Qsend,		0200 }
 96 b8c14089 2003-11-23 devnull };
 97 b8c14089 2003-11-23 devnull static int	ndir = NQID;
 98 b8c14089 2003-11-23 devnull 
 99 b8c14089 2003-11-23 devnull static int		srvfd;
100 8ad51794 2004-03-25 devnull #define clock plumbclock	/* SunOS name clash */
101 b8c14089 2003-11-23 devnull static int		clock;
102 b8c14089 2003-11-23 devnull static Fid		*fids[Nhash];
103 b8c14089 2003-11-23 devnull static QLock	readlock;
104 b8c14089 2003-11-23 devnull static QLock	queue;
105 b8c14089 2003-11-23 devnull static int		messagesize = 8192+IOHDRSZ;	/* good start */
106 b8c14089 2003-11-23 devnull 
107 b8c14089 2003-11-23 devnull static void	fsysproc(void*);
108 b8c14089 2003-11-23 devnull static void fsysrespond(Fcall*, uchar*, char*);
109 b8c14089 2003-11-23 devnull static Fid*	newfid(int);
110 b8c14089 2003-11-23 devnull 
111 b8c14089 2003-11-23 devnull static Fcall* fsysflush(Fcall*, uchar*, Fid*);
112 b8c14089 2003-11-23 devnull static Fcall* fsysversion(Fcall*, uchar*, Fid*);
113 b8c14089 2003-11-23 devnull static Fcall* fsysauth(Fcall*, uchar*, Fid*);
114 b8c14089 2003-11-23 devnull static Fcall* fsysattach(Fcall*, uchar*, Fid*);
115 b8c14089 2003-11-23 devnull static Fcall* fsyswalk(Fcall*, uchar*, Fid*);
116 b8c14089 2003-11-23 devnull static Fcall* fsysopen(Fcall*, uchar*, Fid*);
117 b8c14089 2003-11-23 devnull static Fcall* fsyscreate(Fcall*, uchar*, Fid*);
118 b8c14089 2003-11-23 devnull static Fcall* fsysread(Fcall*, uchar*, Fid*);
119 b8c14089 2003-11-23 devnull static Fcall* fsyswrite(Fcall*, uchar*, Fid*);
120 b8c14089 2003-11-23 devnull static Fcall* fsysclunk(Fcall*, uchar*, Fid*);
121 b8c14089 2003-11-23 devnull static Fcall* fsysremove(Fcall*, uchar*, Fid*);
122 b8c14089 2003-11-23 devnull static Fcall* fsysstat(Fcall*, uchar*, Fid*);
123 b8c14089 2003-11-23 devnull static Fcall* fsyswstat(Fcall*, uchar*, Fid*);
124 b8c14089 2003-11-23 devnull 
125 be22ae2d 2004-03-26 devnull Fcall* 	(*fcall[Tmax])(Fcall*, uchar*, Fid*);
126 be22ae2d 2004-03-26 devnull 
127 be22ae2d 2004-03-26 devnull static void
128 be22ae2d 2004-03-26 devnull initfcall(void)
129 b8c14089 2003-11-23 devnull {
130 be22ae2d 2004-03-26 devnull 	fcall[Tflush]	= fsysflush;
131 be22ae2d 2004-03-26 devnull 	fcall[Tversion]	= fsysversion;
132 be22ae2d 2004-03-26 devnull 	fcall[Tauth]	= fsysauth;
133 be22ae2d 2004-03-26 devnull 	fcall[Tattach]	= fsysattach;
134 be22ae2d 2004-03-26 devnull 	fcall[Twalk]	= fsyswalk;
135 be22ae2d 2004-03-26 devnull 	fcall[Topen]	= fsysopen;
136 be22ae2d 2004-03-26 devnull 	fcall[Tcreate]	= fsyscreate;
137 be22ae2d 2004-03-26 devnull 	fcall[Tread]	= fsysread;
138 be22ae2d 2004-03-26 devnull 	fcall[Twrite]	= fsyswrite;
139 be22ae2d 2004-03-26 devnull 	fcall[Tclunk]	= fsysclunk;
140 be22ae2d 2004-03-26 devnull 	fcall[Tremove]= fsysremove;
141 be22ae2d 2004-03-26 devnull 	fcall[Tstat]	= fsysstat;
142 be22ae2d 2004-03-26 devnull 	fcall[Twstat]	= fsyswstat;
143 be22ae2d 2004-03-26 devnull }
144 b8c14089 2003-11-23 devnull 
145 b8c14089 2003-11-23 devnull char	Ebadfcall[] =	"bad fcall type";
146 b8c14089 2003-11-23 devnull char	Eperm[] = 	"permission denied";
147 b8c14089 2003-11-23 devnull char	Enomem[] =	"malloc failed for buffer";
148 b8c14089 2003-11-23 devnull char	Enotdir[] =	"not a directory";
149 b8c14089 2003-11-23 devnull char	Enoexist[] =	"plumb file does not exist";
150 b8c14089 2003-11-23 devnull char	Eisdir[] =		"file is a directory";
151 b8c14089 2003-11-23 devnull char	Ebadmsg[] =	"bad plumb message format";
152 b8c14089 2003-11-23 devnull char Enosuchport[] ="no such plumb port";
153 b8c14089 2003-11-23 devnull char Enoport[] =	"couldn't find destination for message";
154 b8c14089 2003-11-23 devnull char	Einuse[] = 	"file already open";
155 b8c14089 2003-11-23 devnull 
156 b8c14089 2003-11-23 devnull /*
157 b8c14089 2003-11-23 devnull  * Add new port.  A no-op if port already exists or is the null string
158 b8c14089 2003-11-23 devnull  */
159 b8c14089 2003-11-23 devnull void
160 b8c14089 2003-11-23 devnull addport(char *port)
161 b8c14089 2003-11-23 devnull {
162 b8c14089 2003-11-23 devnull 	int i;
163 b8c14089 2003-11-23 devnull 
164 b8c14089 2003-11-23 devnull 	if(port == nil)
165 b8c14089 2003-11-23 devnull 		return;
166 b8c14089 2003-11-23 devnull 	for(i=NQID; i<ndir; i++)
167 b8c14089 2003-11-23 devnull 		if(strcmp(port, dir[i].name) == 0)
168 b8c14089 2003-11-23 devnull 			return;
169 b8c14089 2003-11-23 devnull 	if(i == NDIR){
170 b8c14089 2003-11-23 devnull 		fprint(2, "plumb: too many ports; max %d\n", NDIR);
171 b8c14089 2003-11-23 devnull 		return;
172 b8c14089 2003-11-23 devnull 	}
173 b8c14089 2003-11-23 devnull 	ndir++;
174 b8c14089 2003-11-23 devnull 	dir[i].name = estrdup(port);
175 b8c14089 2003-11-23 devnull 	dir[i].qid = i;
176 b8c14089 2003-11-23 devnull 	dir[i].perm = 0400;
177 b8c14089 2003-11-23 devnull 	nports++;
178 b8c14089 2003-11-23 devnull 	ports = erealloc(ports, nports*sizeof(char*));
179 b8c14089 2003-11-23 devnull 	ports[nports-1] = dir[i].name;
180 b8c14089 2003-11-23 devnull }
181 b8c14089 2003-11-23 devnull 
182 b8c14089 2003-11-23 devnull static ulong
183 b8c14089 2003-11-23 devnull getclock(void)
184 b8c14089 2003-11-23 devnull {
185 32f69c36 2003-12-11 devnull 	return time(0);
186 b8c14089 2003-11-23 devnull }
187 b8c14089 2003-11-23 devnull 
188 b8c14089 2003-11-23 devnull void
189 b8c14089 2003-11-23 devnull startfsys(void)
190 b8c14089 2003-11-23 devnull {
191 32f69c36 2003-12-11 devnull 	int p[2];
192 b8c14089 2003-11-23 devnull 
193 b8c14089 2003-11-23 devnull 	fmtinstall('F', fcallfmt);
194 b8c14089 2003-11-23 devnull 	clock = getclock();
195 b8c14089 2003-11-23 devnull 	if(pipe(p) < 0)
196 b8c14089 2003-11-23 devnull 		error("can't create pipe: %r");
197 b8c14089 2003-11-23 devnull 	/* 0 will be server end, 1 will be client end */
198 b8c14089 2003-11-23 devnull 	srvfd = p[0];
199 7db5826d 2008-04-17 rsc 	if(post9pservice(p[1], "plumb", nil) < 0)
200 32f69c36 2003-12-11 devnull 		sysfatal("post9pservice plumb: %r");
201 b8c14089 2003-11-23 devnull 	close(p[1]);
202 f4b26b64 2005-01-04 devnull 	proccreate(fsysproc, nil, Stack);
203 b8c14089 2003-11-23 devnull }
204 b8c14089 2003-11-23 devnull 
205 b8c14089 2003-11-23 devnull static void
206 32f69c36 2003-12-11 devnull fsysproc(void *v)
207 b8c14089 2003-11-23 devnull {
208 b8c14089 2003-11-23 devnull 	int n;
209 b8c14089 2003-11-23 devnull 	Fcall *t;
210 b8c14089 2003-11-23 devnull 	Fid *f;
211 b8c14089 2003-11-23 devnull 	uchar *buf;
212 b8c14089 2003-11-23 devnull 
213 32f69c36 2003-12-11 devnull 	USED(v);
214 be22ae2d 2004-03-26 devnull 	initfcall();
215 b8c14089 2003-11-23 devnull 	t = nil;
216 b8c14089 2003-11-23 devnull 	for(;;){
217 b8c14089 2003-11-23 devnull 		buf = malloc(messagesize);	/* avoid memset of emalloc */
218 b8c14089 2003-11-23 devnull 		if(buf == nil)
219 b8c14089 2003-11-23 devnull 			error("malloc failed: %r");
220 b8c14089 2003-11-23 devnull 		qlock(&readlock);
221 f9979097 2004-12-26 devnull 		n = read9pmsg(srvfd, buf, messagesize);
222 b8c14089 2003-11-23 devnull 		if(n <= 0){
223 b8c14089 2003-11-23 devnull 			if(n < 0)
224 b8c14089 2003-11-23 devnull 				error("i/o error on server channel");
225 b8c14089 2003-11-23 devnull 			threadexitsall("unmounted");
226 b8c14089 2003-11-23 devnull 		}
227 f9979097 2004-12-26 devnull 		/*
228 f9979097 2004-12-26 devnull 		 * can give false positive (create an extra fsysproc) once in a while,
229 f9979097 2004-12-26 devnull 		 * but no false negatives, so good enough.  once we have one extra
230 f9979097 2004-12-26 devnull 		 * we'll never have more.
231 f9979097 2004-12-26 devnull 		 */
232 f9979097 2004-12-26 devnull 		if(readlock.waiting.head == nil)	/* no other processes waiting to read; start one */
233 f9979097 2004-12-26 devnull 			proccreate(fsysproc, nil, Stack);
234 b8c14089 2003-11-23 devnull 		qunlock(&readlock);
235 b8c14089 2003-11-23 devnull 		if(t == nil)
236 b8c14089 2003-11-23 devnull 			t = emalloc(sizeof(Fcall));
237 b8c14089 2003-11-23 devnull 		if(convM2S(buf, n, t) != n)
238 b8c14089 2003-11-23 devnull 			error("convert error in convM2S");
239 32f69c36 2003-12-11 devnull 		if(debug)
240 b8c14089 2003-11-23 devnull 			fprint(2, "<= %F\n", t);
241 a8763864 2004-07-09 devnull 		if(fcall[t->type] == 0)
242 b8c14089 2003-11-23 devnull 			fsysrespond(t, buf, Ebadfcall);
243 b8c14089 2003-11-23 devnull 		else{
244 b8c14089 2003-11-23 devnull 			if(t->type==Tversion || t->type==Tauth)
245 b8c14089 2003-11-23 devnull 				f = nil;
246 b8c14089 2003-11-23 devnull 			else
247 b8c14089 2003-11-23 devnull 				f = newfid(t->fid);
248 b8c14089 2003-11-23 devnull 			t = (*fcall[t->type])(t, buf, f);
249 b8c14089 2003-11-23 devnull 		}
250 b8c14089 2003-11-23 devnull 	}
251 b8c14089 2003-11-23 devnull }
252 b8c14089 2003-11-23 devnull 
253 b8c14089 2003-11-23 devnull static void
254 b8c14089 2003-11-23 devnull fsysrespond(Fcall *t, uchar *buf, char *err)
255 b8c14089 2003-11-23 devnull {
256 b8c14089 2003-11-23 devnull 	int n;
257 b8c14089 2003-11-23 devnull 
258 b8c14089 2003-11-23 devnull 	if(err){
259 b8c14089 2003-11-23 devnull 		t->type = Rerror;
260 b8c14089 2003-11-23 devnull 		t->ename = err;
261 b8c14089 2003-11-23 devnull 	}else
262 b8c14089 2003-11-23 devnull 		t->type++;
263 b8c14089 2003-11-23 devnull 	if(buf == nil)
264 b8c14089 2003-11-23 devnull 		buf = emalloc(messagesize);
265 b8c14089 2003-11-23 devnull 	n = convS2M(t, buf, messagesize);
266 b8c14089 2003-11-23 devnull 	if(n < 0)
267 b8c14089 2003-11-23 devnull 		error("convert error in convS2M");
268 b8c14089 2003-11-23 devnull 	if(write(srvfd, buf, n) != n)
269 b8c14089 2003-11-23 devnull 		error("write error in respond");
270 32f69c36 2003-12-11 devnull 	if(debug)
271 b8c14089 2003-11-23 devnull 		fprint(2, "=> %F\n", t);
272 b8c14089 2003-11-23 devnull 	free(buf);
273 b8c14089 2003-11-23 devnull }
274 b8c14089 2003-11-23 devnull 
275 b8c14089 2003-11-23 devnull static
276 b8c14089 2003-11-23 devnull Fid*
277 b8c14089 2003-11-23 devnull newfid(int fid)
278 b8c14089 2003-11-23 devnull {
279 b8c14089 2003-11-23 devnull 	Fid *f, *ff, **fh;
280 b8c14089 2003-11-23 devnull 
281 b8c14089 2003-11-23 devnull 	qlock(&queue);
282 b8c14089 2003-11-23 devnull 	ff = nil;
283 b8c14089 2003-11-23 devnull 	fh = &fids[fid&(Nhash-1)];
284 b8c14089 2003-11-23 devnull 	for(f=*fh; f; f=f->next)
285 b8c14089 2003-11-23 devnull 		if(f->fid == fid)
286 b8c14089 2003-11-23 devnull 			goto Return;
287 b8c14089 2003-11-23 devnull 		else if(ff==nil && !f->busy)
288 b8c14089 2003-11-23 devnull 			ff = f;
289 b8c14089 2003-11-23 devnull 	if(ff){
290 b8c14089 2003-11-23 devnull 		ff->fid = fid;
291 b8c14089 2003-11-23 devnull 		f = ff;
292 b8c14089 2003-11-23 devnull 		goto Return;
293 b8c14089 2003-11-23 devnull 	}
294 b8c14089 2003-11-23 devnull 	f = emalloc(sizeof *f);
295 b8c14089 2003-11-23 devnull 	f->fid = fid;
296 b8c14089 2003-11-23 devnull 	f->next = *fh;
297 b8c14089 2003-11-23 devnull 	*fh = f;
298 b8c14089 2003-11-23 devnull     Return:
299 b8c14089 2003-11-23 devnull 	qunlock(&queue);
300 b8c14089 2003-11-23 devnull 	return f;
301 b8c14089 2003-11-23 devnull }
302 b8c14089 2003-11-23 devnull 
303 b8c14089 2003-11-23 devnull static uint
304 b8c14089 2003-11-23 devnull dostat(Dirtab *dir, uchar *buf, uint nbuf, uint clock)
305 b8c14089 2003-11-23 devnull {
306 b8c14089 2003-11-23 devnull 	Dir d;
307 b8c14089 2003-11-23 devnull 
308 b8c14089 2003-11-23 devnull 	d.qid.type = dir->type;
309 b8c14089 2003-11-23 devnull 	d.qid.path = dir->qid;
310 b8c14089 2003-11-23 devnull 	d.qid.vers = 0;
311 b8c14089 2003-11-23 devnull 	d.mode = dir->perm;
312 b8c14089 2003-11-23 devnull 	d.length = 0;	/* would be nice to do better */
313 b8c14089 2003-11-23 devnull 	d.name = dir->name;
314 b8c14089 2003-11-23 devnull 	d.uid = user;
315 b8c14089 2003-11-23 devnull 	d.gid = user;
316 b8c14089 2003-11-23 devnull 	d.muid = user;
317 b8c14089 2003-11-23 devnull 	d.atime = clock;
318 b8c14089 2003-11-23 devnull 	d.mtime = clock;
319 b8c14089 2003-11-23 devnull 	return convD2M(&d, buf, nbuf);
320 b8c14089 2003-11-23 devnull }
321 b8c14089 2003-11-23 devnull 
322 b8c14089 2003-11-23 devnull static void
323 b8c14089 2003-11-23 devnull queuesend(Dirtab *d, Plumbmsg *m)
324 b8c14089 2003-11-23 devnull {
325 b8c14089 2003-11-23 devnull 	Sendreq *s, *t;
326 b8c14089 2003-11-23 devnull 	Fid *f;
327 b8c14089 2003-11-23 devnull 	int i;
328 b8c14089 2003-11-23 devnull 
329 b8c14089 2003-11-23 devnull 	s = emalloc(sizeof(Sendreq));
330 b8c14089 2003-11-23 devnull 	s->nfid = d->nopen;
331 b8c14089 2003-11-23 devnull 	s->nleft = s->nfid;
332 b8c14089 2003-11-23 devnull 	s->fid = emalloc(s->nfid*sizeof(Fid*));
333 b8c14089 2003-11-23 devnull 	i = 0;
334 b8c14089 2003-11-23 devnull 	/* build array of fids open on this channel */
335 b8c14089 2003-11-23 devnull 	for(f=d->fopen; f!=nil; f=f->nextopen)
336 b8c14089 2003-11-23 devnull 		s->fid[i++] = f;
337 b8c14089 2003-11-23 devnull 	s->msg = m;
338 b8c14089 2003-11-23 devnull 	s->next = nil;
339 b8c14089 2003-11-23 devnull 	/* link to end of queue; drainqueue() searches in sender order so this implements a FIFO */
340 b8c14089 2003-11-23 devnull 	for(t=d->sendq; t!=nil; t=t->next)
341 b8c14089 2003-11-23 devnull 		if(t->next == nil)
342 b8c14089 2003-11-23 devnull 			break;
343 b8c14089 2003-11-23 devnull 	if(t == nil)
344 b8c14089 2003-11-23 devnull 		d->sendq = s;
345 b8c14089 2003-11-23 devnull 	else
346 b8c14089 2003-11-23 devnull 		t->next = s;
347 b8c14089 2003-11-23 devnull }
348 b8c14089 2003-11-23 devnull 
349 b8c14089 2003-11-23 devnull static void
350 b8c14089 2003-11-23 devnull queueread(Dirtab *d, Fcall *t, uchar *buf, Fid *f)
351 b8c14089 2003-11-23 devnull {
352 b8c14089 2003-11-23 devnull 	Readreq *r;
353 b8c14089 2003-11-23 devnull 
354 b8c14089 2003-11-23 devnull 	r = emalloc(sizeof(Readreq));
355 b8c14089 2003-11-23 devnull 	r->fcall = t;
356 b8c14089 2003-11-23 devnull 	r->buf = buf;
357 b8c14089 2003-11-23 devnull 	r->fid = f;
358 b8c14089 2003-11-23 devnull 	r->next = d->readq;
359 b8c14089 2003-11-23 devnull 	d->readq = r;
360 b8c14089 2003-11-23 devnull }
361 b8c14089 2003-11-23 devnull 
362 b8c14089 2003-11-23 devnull static void
363 b8c14089 2003-11-23 devnull drainqueue(Dirtab *d)
364 b8c14089 2003-11-23 devnull {
365 b8c14089 2003-11-23 devnull 	Readreq *r, *nextr, *prevr;
366 b8c14089 2003-11-23 devnull 	Sendreq *s, *nexts, *prevs;
367 b8c14089 2003-11-23 devnull 	int i, n;
368 b8c14089 2003-11-23 devnull 
369 b8c14089 2003-11-23 devnull 	prevs = nil;
370 b8c14089 2003-11-23 devnull 	for(s=d->sendq; s!=nil; s=nexts){
371 b8c14089 2003-11-23 devnull 		nexts = s->next;
372 b8c14089 2003-11-23 devnull 		for(i=0; i<s->nfid; i++){
373 b8c14089 2003-11-23 devnull 			prevr = nil;
374 b8c14089 2003-11-23 devnull 			for(r=d->readq; r!=nil; r=nextr){
375 b8c14089 2003-11-23 devnull 				nextr = r->next;
376 b8c14089 2003-11-23 devnull 				if(r->fid == s->fid[i]){
377 b8c14089 2003-11-23 devnull 					/* pack the message if necessary */
378 b8c14089 2003-11-23 devnull 					if(s->pack == nil)
379 b8c14089 2003-11-23 devnull 						s->pack = plumbpack(s->msg, &s->npack);
380 b8c14089 2003-11-23 devnull 					/* exchange the stuff... */
381 b8c14089 2003-11-23 devnull 					r->fcall->data = s->pack+r->fid->offset;
382 b8c14089 2003-11-23 devnull 					n = s->npack - r->fid->offset;
383 b8c14089 2003-11-23 devnull 					if(n > messagesize-IOHDRSZ)
384 b8c14089 2003-11-23 devnull 						n = messagesize-IOHDRSZ;
385 b8c14089 2003-11-23 devnull 					if(n > r->fcall->count)
386 b8c14089 2003-11-23 devnull 						n = r->fcall->count;
387 b8c14089 2003-11-23 devnull 					r->fcall->count = n;
388 b8c14089 2003-11-23 devnull 					fsysrespond(r->fcall, r->buf, nil);
389 b8c14089 2003-11-23 devnull 					r->fid->offset += n;
390 b8c14089 2003-11-23 devnull 					if(r->fid->offset >= s->npack){
391 b8c14089 2003-11-23 devnull 						/* message transferred; delete this fid from send queue */
392 b8c14089 2003-11-23 devnull 						r->fid->offset = 0;
393 b8c14089 2003-11-23 devnull 						s->fid[i] = nil;
394 b8c14089 2003-11-23 devnull 						s->nleft--;
395 b8c14089 2003-11-23 devnull 					}
396 b8c14089 2003-11-23 devnull 					/* delete read request from queue */
397 b8c14089 2003-11-23 devnull 					if(prevr)
398 b8c14089 2003-11-23 devnull 						prevr->next = r->next;
399 b8c14089 2003-11-23 devnull 					else
400 b8c14089 2003-11-23 devnull 						d->readq = r->next;
401 b8c14089 2003-11-23 devnull 					free(r->fcall);
402 b8c14089 2003-11-23 devnull 					free(r);
403 b8c14089 2003-11-23 devnull 					break;
404 b8c14089 2003-11-23 devnull 				}else
405 b8c14089 2003-11-23 devnull 					prevr = r;
406 b8c14089 2003-11-23 devnull 			}
407 b8c14089 2003-11-23 devnull 		}
408 b8c14089 2003-11-23 devnull 		/* if no fids left, delete this send from queue */
409 b8c14089 2003-11-23 devnull 		if(s->nleft == 0){
410 b8c14089 2003-11-23 devnull 			free(s->fid);
411 b8c14089 2003-11-23 devnull 			plumbfree(s->msg);
412 b8c14089 2003-11-23 devnull 			free(s->pack);
413 b8c14089 2003-11-23 devnull 			if(prevs)
414 b8c14089 2003-11-23 devnull 				prevs->next = s->next;
415 b8c14089 2003-11-23 devnull 			else
416 b8c14089 2003-11-23 devnull 				d->sendq = s->next;
417 b8c14089 2003-11-23 devnull 			free(s);
418 b8c14089 2003-11-23 devnull 		}else
419 b8c14089 2003-11-23 devnull 			prevs = s;
420 b8c14089 2003-11-23 devnull 	}
421 b8c14089 2003-11-23 devnull }
422 b8c14089 2003-11-23 devnull 
423 b8c14089 2003-11-23 devnull /* can't flush a send because they are always answered synchronously */
424 b8c14089 2003-11-23 devnull static void
425 b8c14089 2003-11-23 devnull flushqueue(Dirtab *d, int oldtag)
426 b8c14089 2003-11-23 devnull {
427 b8c14089 2003-11-23 devnull 	Readreq *r, *prevr;
428 b8c14089 2003-11-23 devnull 
429 b8c14089 2003-11-23 devnull 	prevr = nil;
430 b8c14089 2003-11-23 devnull 	for(r=d->readq; r!=nil; r=r->next){
431 b8c14089 2003-11-23 devnull 		if(oldtag == r->fcall->tag){
432 b8c14089 2003-11-23 devnull 			/* delete read request from queue */
433 b8c14089 2003-11-23 devnull 			if(prevr)
434 b8c14089 2003-11-23 devnull 				prevr->next = r->next;
435 b8c14089 2003-11-23 devnull 			else
436 b8c14089 2003-11-23 devnull 				d->readq = r->next;
437 b8c14089 2003-11-23 devnull 			free(r->fcall);
438 b8c14089 2003-11-23 devnull 			free(r->buf);
439 b8c14089 2003-11-23 devnull 			free(r);
440 b8c14089 2003-11-23 devnull 			return;
441 b8c14089 2003-11-23 devnull 		}
442 b8c14089 2003-11-23 devnull 		prevr = r;
443 b8c14089 2003-11-23 devnull 	}
444 b8c14089 2003-11-23 devnull }
445 b8c14089 2003-11-23 devnull 
446 b8c14089 2003-11-23 devnull /* remove messages awaiting delivery to now-closing fid */
447 b8c14089 2003-11-23 devnull static void
448 b8c14089 2003-11-23 devnull removesenders(Dirtab *d, Fid *fid)
449 b8c14089 2003-11-23 devnull {
450 b8c14089 2003-11-23 devnull 	Sendreq *s, *nexts, *prevs;
451 b8c14089 2003-11-23 devnull 	int i;
452 b8c14089 2003-11-23 devnull 
453 b8c14089 2003-11-23 devnull 	prevs = nil;
454 b8c14089 2003-11-23 devnull 	for(s=d->sendq; s!=nil; s=nexts){
455 b8c14089 2003-11-23 devnull 		nexts = s->next;
456 b8c14089 2003-11-23 devnull 		for(i=0; i<s->nfid; i++)
457 b8c14089 2003-11-23 devnull 			if(fid == s->fid[i]){
458 b8c14089 2003-11-23 devnull 				/* delete this fid from send queue */
459 b8c14089 2003-11-23 devnull 				s->fid[i] = nil;
460 b8c14089 2003-11-23 devnull 				s->nleft--;
461 b8c14089 2003-11-23 devnull 				break;
462 b8c14089 2003-11-23 devnull 			}
463 b8c14089 2003-11-23 devnull 		/* if no fids left, delete this send from queue */
464 b8c14089 2003-11-23 devnull 		if(s->nleft == 0){
465 b8c14089 2003-11-23 devnull 			free(s->fid);
466 b8c14089 2003-11-23 devnull 			plumbfree(s->msg);
467 b8c14089 2003-11-23 devnull 			free(s->pack);
468 b8c14089 2003-11-23 devnull 			if(prevs)
469 b8c14089 2003-11-23 devnull 				prevs->next = s->next;
470 b8c14089 2003-11-23 devnull 			else
471 b8c14089 2003-11-23 devnull 				d->sendq = s->next;
472 b8c14089 2003-11-23 devnull 			free(s);
473 b8c14089 2003-11-23 devnull 		}else
474 b8c14089 2003-11-23 devnull 			prevs = s;
475 b8c14089 2003-11-23 devnull 	}
476 b8c14089 2003-11-23 devnull }
477 b8c14089 2003-11-23 devnull 
478 b8c14089 2003-11-23 devnull static void
479 b8c14089 2003-11-23 devnull hold(Plumbmsg *m, Dirtab *d)
480 b8c14089 2003-11-23 devnull {
481 b8c14089 2003-11-23 devnull 	Holdq *h, *q;
482 b8c14089 2003-11-23 devnull 
483 b8c14089 2003-11-23 devnull 	h = emalloc(sizeof(Holdq));
484 b8c14089 2003-11-23 devnull 	h->msg = m;
485 b8c14089 2003-11-23 devnull 	/* add to end of queue */
486 b8c14089 2003-11-23 devnull 	if(d->holdq == nil)
487 b8c14089 2003-11-23 devnull 		d->holdq = h;
488 b8c14089 2003-11-23 devnull 	else{
489 b8c14089 2003-11-23 devnull 		for(q=d->holdq; q->next!=nil; q=q->next)
490 b8c14089 2003-11-23 devnull 			;
491 b8c14089 2003-11-23 devnull 		q->next = h;
492 b8c14089 2003-11-23 devnull 	}
493 b8c14089 2003-11-23 devnull }
494 b8c14089 2003-11-23 devnull 
495 b8c14089 2003-11-23 devnull static void
496 b8c14089 2003-11-23 devnull queueheld(Dirtab *d)
497 b8c14089 2003-11-23 devnull {
498 b8c14089 2003-11-23 devnull 	Holdq *h;
499 b8c14089 2003-11-23 devnull 
500 b8c14089 2003-11-23 devnull 	while(d->holdq != nil){
501 b8c14089 2003-11-23 devnull 		h = d->holdq;
502 b8c14089 2003-11-23 devnull 		d->holdq = h->next;
503 b8c14089 2003-11-23 devnull 		queuesend(d, h->msg);
504 b8c14089 2003-11-23 devnull 		/* no need to drain queue because we know no-one is reading yet */
505 b8c14089 2003-11-23 devnull 		free(h);
506 b8c14089 2003-11-23 devnull 	}
507 b8c14089 2003-11-23 devnull }
508 b8c14089 2003-11-23 devnull 
509 b8c14089 2003-11-23 devnull static void
510 b8c14089 2003-11-23 devnull dispose(Fcall *t, uchar *buf, Plumbmsg *m, Ruleset *rs, Exec *e)
511 b8c14089 2003-11-23 devnull {
512 b8c14089 2003-11-23 devnull 	int i;
513 b8c14089 2003-11-23 devnull 	char *err;
514 b8c14089 2003-11-23 devnull 
515 b8c14089 2003-11-23 devnull 	qlock(&queue);
516 b8c14089 2003-11-23 devnull 	err = nil;
517 b8c14089 2003-11-23 devnull 	if(m->dst==nil || m->dst[0]=='\0'){
518 b8c14089 2003-11-23 devnull 		err = Enoport;
519 b8c14089 2003-11-23 devnull 		if(rs != nil)
520 b8c14089 2003-11-23 devnull 			err = startup(rs, e);
521 b8c14089 2003-11-23 devnull 		plumbfree(m);
522 b8c14089 2003-11-23 devnull 	}else
523 b8c14089 2003-11-23 devnull 		for(i=NQID; i<ndir; i++)
524 b8c14089 2003-11-23 devnull 			if(strcmp(m->dst, dir[i].name) == 0){
525 b8c14089 2003-11-23 devnull 				if(dir[i].nopen == 0){
526 b8c14089 2003-11-23 devnull 					err = startup(rs, e);
527 b8c14089 2003-11-23 devnull 					if(e!=nil && e->holdforclient)
528 b8c14089 2003-11-23 devnull 						hold(m, &dir[i]);
529 b8c14089 2003-11-23 devnull 					else
530 b8c14089 2003-11-23 devnull 						plumbfree(m);
531 b8c14089 2003-11-23 devnull 				}else{
532 b8c14089 2003-11-23 devnull 					queuesend(&dir[i], m);
533 b8c14089 2003-11-23 devnull 					drainqueue(&dir[i]);
534 b8c14089 2003-11-23 devnull 				}
535 b8c14089 2003-11-23 devnull 				break;
536 b8c14089 2003-11-23 devnull 			}
537 b8c14089 2003-11-23 devnull 	freeexec(e);
538 b8c14089 2003-11-23 devnull 	qunlock(&queue);
539 b8c14089 2003-11-23 devnull 	fsysrespond(t, buf, err);
540 b8c14089 2003-11-23 devnull 	free(t);
541 b8c14089 2003-11-23 devnull }
542 b8c14089 2003-11-23 devnull 
543 b8c14089 2003-11-23 devnull static Fcall*
544 32f69c36 2003-12-11 devnull fsysversion(Fcall *t, uchar *buf, Fid *fid)
545 b8c14089 2003-11-23 devnull {
546 32f69c36 2003-12-11 devnull 	USED(fid);
547 32f69c36 2003-12-11 devnull 
548 b8c14089 2003-11-23 devnull 	if(t->msize < 256){
549 b8c14089 2003-11-23 devnull 		fsysrespond(t, buf, "version: message size too small");
550 b8c14089 2003-11-23 devnull 		return t;
551 b8c14089 2003-11-23 devnull 	}
552 b8c14089 2003-11-23 devnull 	if(t->msize < messagesize)
553 b8c14089 2003-11-23 devnull 		messagesize = t->msize;
554 b8c14089 2003-11-23 devnull 	t->msize = messagesize;
555 b8c14089 2003-11-23 devnull 	if(strncmp(t->version, "9P2000", 6) != 0){
556 b8c14089 2003-11-23 devnull 		fsysrespond(t, buf, "unrecognized 9P version");
557 b8c14089 2003-11-23 devnull 		return t;
558 b8c14089 2003-11-23 devnull 	}
559 b8c14089 2003-11-23 devnull 	t->version = "9P2000";
560 b8c14089 2003-11-23 devnull 	fsysrespond(t, buf, nil);
561 b8c14089 2003-11-23 devnull 	return t;
562 b8c14089 2003-11-23 devnull }
563 b8c14089 2003-11-23 devnull 
564 b8c14089 2003-11-23 devnull static Fcall*
565 32f69c36 2003-12-11 devnull fsysauth(Fcall *t, uchar *buf, Fid *fid)
566 b8c14089 2003-11-23 devnull {
567 32f69c36 2003-12-11 devnull 	USED(fid);
568 b8c14089 2003-11-23 devnull 	fsysrespond(t, buf, "plumber: authentication not required");
569 b8c14089 2003-11-23 devnull 	return t;
570 b8c14089 2003-11-23 devnull }
571 b8c14089 2003-11-23 devnull 
572 b8c14089 2003-11-23 devnull static Fcall*
573 b8c14089 2003-11-23 devnull fsysattach(Fcall *t, uchar *buf, Fid *f)
574 b8c14089 2003-11-23 devnull {
575 b8c14089 2003-11-23 devnull 	Fcall out;
576 b8c14089 2003-11-23 devnull 
577 a6ba36b6 2010-10-07 rsc /*
578 b8c14089 2003-11-23 devnull 	if(strcmp(t->uname, user) != 0){
579 b8c14089 2003-11-23 devnull 		fsysrespond(&out, buf, Eperm);
580 b8c14089 2003-11-23 devnull 		return t;
581 b8c14089 2003-11-23 devnull 	}
582 a6ba36b6 2010-10-07 rsc */
583 b8c14089 2003-11-23 devnull 	f->busy = 1;
584 b8c14089 2003-11-23 devnull 	f->open = 0;
585 b8c14089 2003-11-23 devnull 	f->qid.type = QTDIR;
586 b8c14089 2003-11-23 devnull 	f->qid.path = Qdir;
587 b8c14089 2003-11-23 devnull 	f->qid.vers = 0;
588 b8c14089 2003-11-23 devnull 	f->dir = dir;
589 b8c14089 2003-11-23 devnull 	memset(&out, 0, sizeof(Fcall));
590 b8c14089 2003-11-23 devnull 	out.type = t->type;
591 b8c14089 2003-11-23 devnull 	out.tag = t->tag;
592 b8c14089 2003-11-23 devnull 	out.fid = f->fid;
593 b8c14089 2003-11-23 devnull 	out.qid = f->qid;
594 b8c14089 2003-11-23 devnull 	fsysrespond(&out, buf, nil);
595 b8c14089 2003-11-23 devnull 	return t;
596 b8c14089 2003-11-23 devnull }
597 b8c14089 2003-11-23 devnull 
598 b8c14089 2003-11-23 devnull static Fcall*
599 32f69c36 2003-12-11 devnull fsysflush(Fcall *t, uchar *buf, Fid *fid)
600 b8c14089 2003-11-23 devnull {
601 b8c14089 2003-11-23 devnull 	int i;
602 b8c14089 2003-11-23 devnull 
603 32f69c36 2003-12-11 devnull 	USED(fid);
604 b8c14089 2003-11-23 devnull 	qlock(&queue);
605 b8c14089 2003-11-23 devnull 	for(i=NQID; i<ndir; i++)
606 b8c14089 2003-11-23 devnull 		flushqueue(&dir[i], t->oldtag);
607 b8c14089 2003-11-23 devnull 	qunlock(&queue);
608 b8c14089 2003-11-23 devnull 	fsysrespond(t, buf, nil);
609 b8c14089 2003-11-23 devnull 	return t;
610 b8c14089 2003-11-23 devnull }
611 b8c14089 2003-11-23 devnull 
612 b8c14089 2003-11-23 devnull static Fcall*
613 b8c14089 2003-11-23 devnull fsyswalk(Fcall *t, uchar *buf, Fid *f)
614 b8c14089 2003-11-23 devnull {
615 b8c14089 2003-11-23 devnull 	Fcall out;
616 b8c14089 2003-11-23 devnull 	Fid *nf;
617 b8c14089 2003-11-23 devnull 	ulong path;
618 b8c14089 2003-11-23 devnull 	Dirtab *d, *dir;
619 b8c14089 2003-11-23 devnull 	Qid q;
620 b8c14089 2003-11-23 devnull 	int i;
621 b8c14089 2003-11-23 devnull 	uchar type;
622 b8c14089 2003-11-23 devnull 	char *err;
623 b8c14089 2003-11-23 devnull 
624 b8c14089 2003-11-23 devnull 	if(f->open){
625 b8c14089 2003-11-23 devnull 		fsysrespond(t, buf, "clone of an open fid");
626 b8c14089 2003-11-23 devnull 		return t;
627 b8c14089 2003-11-23 devnull 	}
628 b8c14089 2003-11-23 devnull 
629 b8c14089 2003-11-23 devnull 	nf = nil;
630 b8c14089 2003-11-23 devnull 	if(t->fid  != t->newfid){
631 b8c14089 2003-11-23 devnull 		nf = newfid(t->newfid);
632 b8c14089 2003-11-23 devnull 		if(nf->busy){
633 b8c14089 2003-11-23 devnull 			fsysrespond(t, buf, "clone to a busy fid");
634 b8c14089 2003-11-23 devnull 			return t;
635 b8c14089 2003-11-23 devnull 		}
636 b8c14089 2003-11-23 devnull 		nf->busy = 1;
637 b8c14089 2003-11-23 devnull 		nf->open = 0;
638 b8c14089 2003-11-23 devnull 		nf->dir = f->dir;
639 b8c14089 2003-11-23 devnull 		nf->qid = f->qid;
640 b8c14089 2003-11-23 devnull 		f = nf;	/* walk f */
641 b8c14089 2003-11-23 devnull 	}
642 b8c14089 2003-11-23 devnull 
643 b8c14089 2003-11-23 devnull 	out.nwqid = 0;
644 b8c14089 2003-11-23 devnull 	err = nil;
645 b8c14089 2003-11-23 devnull 	dir = f->dir;
646 b8c14089 2003-11-23 devnull 	q = f->qid;
647 b8c14089 2003-11-23 devnull 
648 b8c14089 2003-11-23 devnull 	if(t->nwname > 0){
649 b8c14089 2003-11-23 devnull 		for(i=0; i<t->nwname; i++){
650 b8c14089 2003-11-23 devnull 			if((q.type & QTDIR) == 0){
651 b8c14089 2003-11-23 devnull 				err = Enotdir;
652 b8c14089 2003-11-23 devnull 				break;
653 b8c14089 2003-11-23 devnull 			}
654 b8c14089 2003-11-23 devnull 			if(strcmp(t->wname[i], "..") == 0){
655 b8c14089 2003-11-23 devnull 				type = QTDIR;
656 b8c14089 2003-11-23 devnull 				path = Qdir;
657 b8c14089 2003-11-23 devnull 	Accept:
658 b8c14089 2003-11-23 devnull 				q.type = type;
659 b8c14089 2003-11-23 devnull 				q.vers = 0;
660 b8c14089 2003-11-23 devnull 				q.path = path;
661 b8c14089 2003-11-23 devnull 				out.wqid[out.nwqid++] = q;
662 b8c14089 2003-11-23 devnull 				continue;
663 b8c14089 2003-11-23 devnull 			}
664 b8c14089 2003-11-23 devnull 			d = dir;
665 b8c14089 2003-11-23 devnull 			d++;	/* skip '.' */
666 b8c14089 2003-11-23 devnull 			for(; d->name; d++)
667 b8c14089 2003-11-23 devnull 				if(strcmp(t->wname[i], d->name) == 0){
668 b8c14089 2003-11-23 devnull 					type = d->type;
669 b8c14089 2003-11-23 devnull 					path = d->qid;
670 b8c14089 2003-11-23 devnull 					dir = d;
671 b8c14089 2003-11-23 devnull 					goto Accept;
672 b8c14089 2003-11-23 devnull 				}
673 b8c14089 2003-11-23 devnull 			err = Enoexist;
674 b8c14089 2003-11-23 devnull 			break;
675 b8c14089 2003-11-23 devnull 		}
676 b8c14089 2003-11-23 devnull 	}
677 b8c14089 2003-11-23 devnull 
678 b8c14089 2003-11-23 devnull 	out.type = t->type;
679 b8c14089 2003-11-23 devnull 	out.tag = t->tag;
680 b8c14089 2003-11-23 devnull 	if(err!=nil || out.nwqid<t->nwname){
681 b8c14089 2003-11-23 devnull 		if(nf)
682 b8c14089 2003-11-23 devnull 			nf->busy = 0;
683 b8c14089 2003-11-23 devnull 	}else if(out.nwqid == t->nwname){
684 b8c14089 2003-11-23 devnull 		f->qid = q;
685 b8c14089 2003-11-23 devnull 		f->dir = dir;
686 b8c14089 2003-11-23 devnull 	}
687 b8c14089 2003-11-23 devnull 
688 b8c14089 2003-11-23 devnull 	fsysrespond(&out, buf, err);
689 b8c14089 2003-11-23 devnull 	return t;
690 b8c14089 2003-11-23 devnull }
691 b8c14089 2003-11-23 devnull 
692 b8c14089 2003-11-23 devnull static Fcall*
693 b8c14089 2003-11-23 devnull fsysopen(Fcall *t, uchar *buf, Fid *f)
694 b8c14089 2003-11-23 devnull {
695 b8c14089 2003-11-23 devnull 	int m, clearrules, mode;
696 b8c14089 2003-11-23 devnull 
697 b8c14089 2003-11-23 devnull 	clearrules = 0;
698 b8c14089 2003-11-23 devnull 	if(t->mode & OTRUNC){
699 b8c14089 2003-11-23 devnull 		if(f->qid.path != Qrules)
700 b8c14089 2003-11-23 devnull 			goto Deny;
701 b8c14089 2003-11-23 devnull 		clearrules = 1;
702 b8c14089 2003-11-23 devnull 	}
703 b8c14089 2003-11-23 devnull 	/* can't truncate anything, so just disregard */
704 b8c14089 2003-11-23 devnull 	mode = t->mode & ~(OTRUNC|OCEXEC);
705 b8c14089 2003-11-23 devnull 	/* can't execute or remove anything */
706 b8c14089 2003-11-23 devnull 	if(mode==OEXEC || (mode&ORCLOSE))
707 b8c14089 2003-11-23 devnull 		goto Deny;
708 b8c14089 2003-11-23 devnull 	switch(mode){
709 b8c14089 2003-11-23 devnull 	default:
710 b8c14089 2003-11-23 devnull 		goto Deny;
711 b8c14089 2003-11-23 devnull 	case OREAD:
712 b8c14089 2003-11-23 devnull 		m = 0400;
713 b8c14089 2003-11-23 devnull 		break;
714 b8c14089 2003-11-23 devnull 	case OWRITE:
715 b8c14089 2003-11-23 devnull 		m = 0200;
716 b8c14089 2003-11-23 devnull 		break;
717 b8c14089 2003-11-23 devnull 	case ORDWR:
718 b8c14089 2003-11-23 devnull 		m = 0600;
719 b8c14089 2003-11-23 devnull 		break;
720 b8c14089 2003-11-23 devnull 	}
721 b8c14089 2003-11-23 devnull 	if(((f->dir->perm&~(DMDIR|DMAPPEND))&m) != m)
722 b8c14089 2003-11-23 devnull 		goto Deny;
723 b8c14089 2003-11-23 devnull 	if(f->qid.path==Qrules && (mode==OWRITE || mode==ORDWR)){
724 32f69c36 2003-12-11 devnull 		lock(&rulesref.lk);
725 b8c14089 2003-11-23 devnull 		if(rulesref.ref++ != 0){
726 b8c14089 2003-11-23 devnull 			rulesref.ref--;
727 32f69c36 2003-12-11 devnull 			unlock(&rulesref.lk);
728 b8c14089 2003-11-23 devnull 			fsysrespond(t, buf, Einuse);
729 b8c14089 2003-11-23 devnull 			return t;
730 b8c14089 2003-11-23 devnull 		}
731 32f69c36 2003-12-11 devnull 		unlock(&rulesref.lk);
732 b8c14089 2003-11-23 devnull 	}
733 b8c14089 2003-11-23 devnull 	if(clearrules){
734 b8c14089 2003-11-23 devnull 		writerules(nil, 0);
735 b8c14089 2003-11-23 devnull 		rules[0] = nil;
736 b8c14089 2003-11-23 devnull 	}
737 b8c14089 2003-11-23 devnull 	t->qid = f->qid;
738 b8c14089 2003-11-23 devnull 	t->iounit = 0;
739 b8c14089 2003-11-23 devnull 	qlock(&queue);
740 b8c14089 2003-11-23 devnull 	f->mode = mode;
741 b8c14089 2003-11-23 devnull 	f->open = 1;
742 b8c14089 2003-11-23 devnull 	f->dir->nopen++;
743 b8c14089 2003-11-23 devnull 	f->nextopen = f->dir->fopen;
744 b8c14089 2003-11-23 devnull 	f->dir->fopen = f;
745 b8c14089 2003-11-23 devnull 	queueheld(f->dir);
746 b8c14089 2003-11-23 devnull 	qunlock(&queue);
747 b8c14089 2003-11-23 devnull 	fsysrespond(t, buf, nil);
748 b8c14089 2003-11-23 devnull 	return t;
749 b8c14089 2003-11-23 devnull 
750 b8c14089 2003-11-23 devnull     Deny:
751 b8c14089 2003-11-23 devnull 	fsysrespond(t, buf, Eperm);
752 b8c14089 2003-11-23 devnull 	return t;
753 b8c14089 2003-11-23 devnull }
754 b8c14089 2003-11-23 devnull 
755 b8c14089 2003-11-23 devnull static Fcall*
756 32f69c36 2003-12-11 devnull fsyscreate(Fcall *t, uchar *buf, Fid *fid)
757 b8c14089 2003-11-23 devnull {
758 32f69c36 2003-12-11 devnull 	USED(fid);
759 b8c14089 2003-11-23 devnull 	fsysrespond(t, buf, Eperm);
760 b8c14089 2003-11-23 devnull 	return t;
761 b8c14089 2003-11-23 devnull }
762 b8c14089 2003-11-23 devnull 
763 b8c14089 2003-11-23 devnull static Fcall*
764 b8c14089 2003-11-23 devnull fsysreadrules(Fcall *t, uchar *buf)
765 b8c14089 2003-11-23 devnull {
766 b8c14089 2003-11-23 devnull 	char *p;
767 b8c14089 2003-11-23 devnull 	int n;
768 b8c14089 2003-11-23 devnull 
769 b8c14089 2003-11-23 devnull 	p = printrules();
770 b8c14089 2003-11-23 devnull 	n = strlen(p);
771 b8c14089 2003-11-23 devnull 	t->data = p;
772 b8c14089 2003-11-23 devnull 	if(t->offset >= n)
773 b8c14089 2003-11-23 devnull 		t->count = 0;
774 b8c14089 2003-11-23 devnull 	else{
775 b8c14089 2003-11-23 devnull 		t->data = p+t->offset;
776 b8c14089 2003-11-23 devnull 		if(t->offset+t->count > n)
777 b8c14089 2003-11-23 devnull 			t->count = n-t->offset;
778 b8c14089 2003-11-23 devnull 	}
779 b8c14089 2003-11-23 devnull 	fsysrespond(t, buf, nil);
780 b8c14089 2003-11-23 devnull 	free(p);
781 b8c14089 2003-11-23 devnull 	return t;
782 b8c14089 2003-11-23 devnull }
783 b8c14089 2003-11-23 devnull 
784 b8c14089 2003-11-23 devnull static Fcall*
785 b8c14089 2003-11-23 devnull fsysread(Fcall *t, uchar *buf, Fid *f)
786 b8c14089 2003-11-23 devnull {
787 b8c14089 2003-11-23 devnull 	uchar *b;
788 b8c14089 2003-11-23 devnull 	int i, n, o, e;
789 b8c14089 2003-11-23 devnull 	uint len;
790 b8c14089 2003-11-23 devnull 	Dirtab *d;
791 b8c14089 2003-11-23 devnull 	uint clock;
792 b8c14089 2003-11-23 devnull 
793 b8c14089 2003-11-23 devnull 	if(f->qid.path != Qdir){
794 b8c14089 2003-11-23 devnull 		if(f->qid.path == Qrules)
795 b8c14089 2003-11-23 devnull 			return fsysreadrules(t, buf);
796 b8c14089 2003-11-23 devnull 		/* read from port */
797 b8c14089 2003-11-23 devnull 		if(f->qid.path < NQID){
798 b8c14089 2003-11-23 devnull 			fsysrespond(t, buf, "internal error: unknown read port");
799 b8c14089 2003-11-23 devnull 			return t;
800 b8c14089 2003-11-23 devnull 		}
801 b8c14089 2003-11-23 devnull 		qlock(&queue);
802 b8c14089 2003-11-23 devnull 		queueread(f->dir, t, buf, f);
803 b8c14089 2003-11-23 devnull 		drainqueue(f->dir);
804 b8c14089 2003-11-23 devnull 		qunlock(&queue);
805 b8c14089 2003-11-23 devnull 		return nil;
806 b8c14089 2003-11-23 devnull 	}
807 b8c14089 2003-11-23 devnull 	o = t->offset;
808 b8c14089 2003-11-23 devnull 	e = t->offset+t->count;
809 b8c14089 2003-11-23 devnull 	clock = getclock();
810 b8c14089 2003-11-23 devnull 	b = malloc(messagesize-IOHDRSZ);
811 b8c14089 2003-11-23 devnull 	if(b == nil){
812 b8c14089 2003-11-23 devnull 		fsysrespond(t, buf, Enomem);
813 b8c14089 2003-11-23 devnull 		return t;
814 b8c14089 2003-11-23 devnull 	}
815 b8c14089 2003-11-23 devnull 	n = 0;
816 b8c14089 2003-11-23 devnull 	d = dir;
817 b8c14089 2003-11-23 devnull 	d++;	/* first entry is '.' */
818 b8c14089 2003-11-23 devnull 	for(i=0; d->name!=nil && i<e; i+=len){
819 b8c14089 2003-11-23 devnull 		len = dostat(d, b+n, messagesize-IOHDRSZ-n, clock);
820 b8c14089 2003-11-23 devnull 		if(len <= BIT16SZ)
821 b8c14089 2003-11-23 devnull 			break;
822 b8c14089 2003-11-23 devnull 		if(i >= o)
823 b8c14089 2003-11-23 devnull 			n += len;
824 b8c14089 2003-11-23 devnull 		d++;
825 b8c14089 2003-11-23 devnull 	}
826 b8c14089 2003-11-23 devnull 	t->data = (char*)b;
827 b8c14089 2003-11-23 devnull 	t->count = n;
828 b8c14089 2003-11-23 devnull 	fsysrespond(t, buf, nil);
829 b8c14089 2003-11-23 devnull 	free(b);
830 b8c14089 2003-11-23 devnull 	return t;
831 b8c14089 2003-11-23 devnull }
832 b8c14089 2003-11-23 devnull 
833 b8c14089 2003-11-23 devnull static Fcall*
834 b8c14089 2003-11-23 devnull fsyswrite(Fcall *t, uchar *buf, Fid *f)
835 b8c14089 2003-11-23 devnull {
836 b8c14089 2003-11-23 devnull 	Plumbmsg *m;
837 b8c14089 2003-11-23 devnull 	int i, n;
838 b8c14089 2003-11-23 devnull 	long count;
839 b8c14089 2003-11-23 devnull 	char *data;
840 b8c14089 2003-11-23 devnull 	Exec *e;
841 b8c14089 2003-11-23 devnull 
842 b8c14089 2003-11-23 devnull 	switch((int)f->qid.path){
843 b8c14089 2003-11-23 devnull 	case Qdir:
844 b8c14089 2003-11-23 devnull 		fsysrespond(t, buf, Eisdir);
845 b8c14089 2003-11-23 devnull 		return t;
846 b8c14089 2003-11-23 devnull 	case Qrules:
847 b8c14089 2003-11-23 devnull 		clock = getclock();
848 b8c14089 2003-11-23 devnull 		fsysrespond(t, buf, writerules(t->data, t->count));
849 b8c14089 2003-11-23 devnull 		return t;
850 b8c14089 2003-11-23 devnull 	case Qsend:
851 b8c14089 2003-11-23 devnull 		if(f->offset == 0){
852 b8c14089 2003-11-23 devnull 			data = t->data;
853 b8c14089 2003-11-23 devnull 			count = t->count;
854 b8c14089 2003-11-23 devnull 		}else{
855 b8c14089 2003-11-23 devnull 			/* partial message already assembled */
856 b8c14089 2003-11-23 devnull 			f->writebuf = erealloc(f->writebuf, f->offset + t->count);
857 b8c14089 2003-11-23 devnull 			memmove(f->writebuf+f->offset, t->data, t->count);
858 b8c14089 2003-11-23 devnull 			data = f->writebuf;
859 b8c14089 2003-11-23 devnull 			count = f->offset+t->count;
860 b8c14089 2003-11-23 devnull 		}
861 b8c14089 2003-11-23 devnull 		m = plumbunpackpartial(data, count, &n);
862 b8c14089 2003-11-23 devnull 		if(m == nil){
863 b8c14089 2003-11-23 devnull 			if(n == 0){
864 b8c14089 2003-11-23 devnull 				f->offset = 0;
865 b8c14089 2003-11-23 devnull 				free(f->writebuf);
866 b8c14089 2003-11-23 devnull 				f->writebuf = nil;
867 b8c14089 2003-11-23 devnull 				fsysrespond(t, buf, Ebadmsg);
868 b8c14089 2003-11-23 devnull 				return t;
869 b8c14089 2003-11-23 devnull 			}
870 b8c14089 2003-11-23 devnull 			/* can read more... */
871 b8c14089 2003-11-23 devnull 			if(f->offset == 0){
872 b8c14089 2003-11-23 devnull 				f->writebuf = emalloc(t->count);
873 b8c14089 2003-11-23 devnull 				memmove(f->writebuf, t->data, t->count);
874 b8c14089 2003-11-23 devnull 			}
875 b8c14089 2003-11-23 devnull 			/* else buffer has already been grown */
876 b8c14089 2003-11-23 devnull 			f->offset += t->count;
877 b8c14089 2003-11-23 devnull 			fsysrespond(t, buf, nil);
878 b8c14089 2003-11-23 devnull 			return t;
879 b8c14089 2003-11-23 devnull 		}
880 b8c14089 2003-11-23 devnull 		/* release partial buffer */
881 b8c14089 2003-11-23 devnull 		f->offset = 0;
882 b8c14089 2003-11-23 devnull 		free(f->writebuf);
883 b8c14089 2003-11-23 devnull 		f->writebuf = nil;
884 b8c14089 2003-11-23 devnull 		for(i=0; rules[i]; i++)
885 b8c14089 2003-11-23 devnull 			if((e=matchruleset(m, rules[i])) != nil){
886 b8c14089 2003-11-23 devnull 				dispose(t, buf, m, rules[i], e);
887 b8c14089 2003-11-23 devnull 				return nil;
888 b8c14089 2003-11-23 devnull 			}
889 b8c14089 2003-11-23 devnull 		if(m->dst != nil){
890 b8c14089 2003-11-23 devnull 			dispose(t, buf, m, nil, nil);
891 b8c14089 2003-11-23 devnull 			return nil;
892 b8c14089 2003-11-23 devnull 		}
893 b8c14089 2003-11-23 devnull 		fsysrespond(t, buf, "no matching plumb rule");
894 b8c14089 2003-11-23 devnull 		return t;
895 b8c14089 2003-11-23 devnull 	}
896 b8c14089 2003-11-23 devnull 	fsysrespond(t, buf, "internal error: write to unknown file");
897 b8c14089 2003-11-23 devnull 	return t;
898 b8c14089 2003-11-23 devnull }
899 b8c14089 2003-11-23 devnull 
900 b8c14089 2003-11-23 devnull static Fcall*
901 b8c14089 2003-11-23 devnull fsysstat(Fcall *t, uchar *buf, Fid *f)
902 b8c14089 2003-11-23 devnull {
903 b8c14089 2003-11-23 devnull 	t->stat = emalloc(messagesize-IOHDRSZ);
904 b8c14089 2003-11-23 devnull 	t->nstat = dostat(f->dir, t->stat, messagesize-IOHDRSZ, clock);
905 b8c14089 2003-11-23 devnull 	fsysrespond(t, buf, nil);
906 b8c14089 2003-11-23 devnull 	free(t->stat);
907 b8c14089 2003-11-23 devnull 	t->stat = nil;
908 b8c14089 2003-11-23 devnull 	return t;
909 b8c14089 2003-11-23 devnull }
910 b8c14089 2003-11-23 devnull 
911 b8c14089 2003-11-23 devnull static Fcall*
912 32f69c36 2003-12-11 devnull fsyswstat(Fcall *t, uchar *buf, Fid *fid)
913 b8c14089 2003-11-23 devnull {
914 32f69c36 2003-12-11 devnull 	USED(fid);
915 b8c14089 2003-11-23 devnull 	fsysrespond(t, buf, Eperm);
916 b8c14089 2003-11-23 devnull 	return t;
917 b8c14089 2003-11-23 devnull }
918 b8c14089 2003-11-23 devnull 
919 b8c14089 2003-11-23 devnull static Fcall*
920 32f69c36 2003-12-11 devnull fsysremove(Fcall *t, uchar *buf, Fid *fid)
921 b8c14089 2003-11-23 devnull {
922 32f69c36 2003-12-11 devnull 	USED(fid);
923 b8c14089 2003-11-23 devnull 	fsysrespond(t, buf, Eperm);
924 b8c14089 2003-11-23 devnull 	return t;
925 b8c14089 2003-11-23 devnull }
926 b8c14089 2003-11-23 devnull 
927 b8c14089 2003-11-23 devnull static Fcall*
928 b8c14089 2003-11-23 devnull fsysclunk(Fcall *t, uchar *buf, Fid *f)
929 b8c14089 2003-11-23 devnull {
930 b8c14089 2003-11-23 devnull 	Fid *prev, *p;
931 b8c14089 2003-11-23 devnull 	Dirtab *d;
932 b8c14089 2003-11-23 devnull 
933 b8c14089 2003-11-23 devnull 	qlock(&queue);
934 b8c14089 2003-11-23 devnull 	if(f->open){
935 b8c14089 2003-11-23 devnull 		d = f->dir;
936 b8c14089 2003-11-23 devnull 		d->nopen--;
937 b8c14089 2003-11-23 devnull 		if(d->qid==Qrules && (f->mode==OWRITE || f->mode==ORDWR)){
938 b8c14089 2003-11-23 devnull 			/*
939 b8c14089 2003-11-23 devnull 			 * just to be sure last rule is parsed; error messages will be lost, though,
940 b8c14089 2003-11-23 devnull 			 * unless last write ended with a blank line
941 b8c14089 2003-11-23 devnull 			 */
942 b8c14089 2003-11-23 devnull 			writerules(nil, 0);
943 32f69c36 2003-12-11 devnull 			lock(&rulesref.lk);
944 b8c14089 2003-11-23 devnull 			rulesref.ref--;
945 32f69c36 2003-12-11 devnull 			unlock(&rulesref.lk);
946 b8c14089 2003-11-23 devnull 		}
947 b8c14089 2003-11-23 devnull 		prev = nil;
948 b8c14089 2003-11-23 devnull 		for(p=d->fopen; p; p=p->nextopen){
949 b8c14089 2003-11-23 devnull 			if(p == f){
950 b8c14089 2003-11-23 devnull 				if(prev)
951 b8c14089 2003-11-23 devnull 					prev->nextopen = f->nextopen;
952 b8c14089 2003-11-23 devnull 				else
953 b8c14089 2003-11-23 devnull 					d->fopen = f->nextopen;
954 b8c14089 2003-11-23 devnull 				removesenders(d, f);
955 b8c14089 2003-11-23 devnull 				break;
956 b8c14089 2003-11-23 devnull 			}
957 b8c14089 2003-11-23 devnull 			prev = p;
958 b8c14089 2003-11-23 devnull 		}
959 b8c14089 2003-11-23 devnull 	}
960 b8c14089 2003-11-23 devnull 	f->busy = 0;
961 b8c14089 2003-11-23 devnull 	f->open = 0;
962 b8c14089 2003-11-23 devnull 	f->offset = 0;
963 b8c14089 2003-11-23 devnull 	if(f->writebuf != nil){
964 b8c14089 2003-11-23 devnull 		free(f->writebuf);
965 b8c14089 2003-11-23 devnull 		f->writebuf = nil;
966 b8c14089 2003-11-23 devnull 	}
967 b8c14089 2003-11-23 devnull 	qunlock(&queue);
968 b8c14089 2003-11-23 devnull 	fsysrespond(t, buf, nil);
969 b8c14089 2003-11-23 devnull 	return t;
970 b8c14089 2003-11-23 devnull }