WebSVN – planix.SVN – Blame – /os/branches/feature_unix/sys/src/cmd/unix/u9fs/u9fs.c

Rev	Author	Line No.	Line
2	-	1	`/* already in plan9.h #include <sys/types.h> // for struct passwd, struct group, struct stat ... */`
		2	`/* plan9.h is first to get the large file support definitions as early as possible */`
		3	`#include <plan9.h>`
		4	`#include <sys/stat.h> /* for stat, umask */`
		5	`#include <stdlib.h> /* for malloc */`
		6	`#include <string.h> /* for strcpy, memmove */`
		7	`#include <pwd.h> /* for getpwnam, getpwuid */`
		8	`#include <grp.h> /* for getgrnam, getgrgid */`
		9	`#include <unistd.h> /* for gethostname, pread, pwrite, read, write */`
		10	`#include <utime.h> /* for utime */`
		11	`#include <dirent.h> /* for readdir */`
		12	`#include <errno.h> /* for errno */`
		13	`#include <stdio.h> /* for remove [sic] */`
		14	`#include <fcntl.h> /* for O_RDONLY, etc. */`
71	7u83	15	`#include <limits.h> /* PATH_MAX */`
2	-	16
		17	`#include <sys/socket.h> /* various networking crud */`
		18	`#include <netinet/in.h>`
		19	`#include <netdb.h>`
		20
		21	`#include <fcall.h>`
		22	`#include <oldfcall.h>`
		23	`#include <u9fs.h>`
		24
		25	`/* #ifndef because can be given in makefile */`
		26	`#ifndef DEFAULTLOG`
		27	`#define DEFAULTLOG "/tmp/u9fs.log"`
		28	`#endif`
		29
65	7u83	30
2	-	31	`char *logfile = DEFAULTLOG;`
		32
		33	`#define S_ISSPECIAL(m) (S_ISCHR(m) \|\| S_ISBLK(m) \|\| S_ISFIFO(m))`
		34
		35	`enum {`
		36	`Tdot = 1,`
		37	`Tdotdot`
		38	`};`
		39
		40	`enum {`
		41	`P9P1,`
		42	`P9P2000`
		43	`};`
		44
71	7u83	45
		46
2	-	47	`typedef struct User User;`
		48	`struct User {`
		49	`int id;`
		50	`gid_t defaultgid;`
		51	`char *name;`
		52	`char *mem; / group members */`
		53	`int nmem;`
		54	`User *next;`
71	7u83	55	`char home_dir[PATH_MAX];`
2	-	56	`};`
		57
		58	`struct Fid {`
		59	`int fid;`
		60	`char *path;`
		61	`struct stat st;`
		62	`User *u;`
		63	`int omode;`
		64	`DIR *dir;`
		65	`int diroffset;`
		66	`int fd;`
		67	`struct dirent *dirent;`
		68	`int direof;`
		69	`Fid *next;`
		70	`Fid *prev;`
		71	`int auth;`
		72	`void *authmagic;`
		73	`};`
		74
		75	`void* emalloc(size_t);`
		76	`void* erealloc(void*, size_t);`
		77	`char* estrdup(char*);`
		78	`char* estrpath(char, char, int);`
		79	`void sysfatal(char*, ...);`
		80	`int okuser(char*);`
		81
		82	`void rversion(Fcall, Fcall);`
		83	`void rauth(Fcall, Fcall);`
		84	`void rattach(Fcall, Fcall);`
		85	`void rflush(Fcall, Fcall);`
		86	`void rclone(Fcall, Fcall);`
		87	`void rwalk(Fcall, Fcall);`
		88	`void ropen(Fcall, Fcall);`
		89	`void rcreate(Fcall, Fcall);`
		90	`void rread(Fcall, Fcall);`
		91	`void rwrite(Fcall, Fcall);`
		92	`void rclunk(Fcall, Fcall);`
		93	`void rstat(Fcall, Fcall);`
		94	`void rwstat(Fcall, Fcall);`
		95	`void rclwalk(Fcall, Fcall);`
		96	`void rremove(Fcall, Fcall);`
		97
		98	`User* uname2user(char*);`
		99	`User* gname2user(char*);`
		100	`User* uid2user(int);`
		101	`User* gid2user(int);`
		102
		103	`Fid* newfid(int, char**);`
		104	`Fid* oldfidex(int, int, char**);`
		105	`Fid* oldfid(int, char**);`
		106	`int fidstat(Fid, char*);`
		107	`void freefid(Fid*);`
		108
		109	`int userchange(User, char*);`
		110	`int userwalk(User, char, char, Qid, char*);`
		111	`int useropen(Fid, int, char*);`
		112	`int usercreate(Fid, char, int, long, char**);`
		113	`int userremove(Fid, char*);`
		114	`int userperm(User, char, int, int);`
		115	`int useringroup(User, User);`
		116
		117	`Qid stat2qid(struct stat*);`
		118
		119	`void getfcallold(int, Fcall*, int);`
		120	`void putfcallold(int, Fcall*);`
		121
		122	`char Eauth[] = "authentication failed";`
		123	`char Ebadfid[] = "fid unknown or out of range";`
		124	`char Ebadoffset[] = "bad offset in directory read";`
		125	`char Ebadusefid[] = "bad use of fid";`
		126	`char Edirchange[] = "wstat can't convert between files and directories";`
		127	`char Eexist[] = "file or directory already exists";`
		128	`char Efidactive[] = "fid already in use";`
		129	`char Enotdir[] = "not a directory";`
		130	`char Enotingroup[] = "not a member of proposed group";`
		131	`char Enotowner[] = "only owner can change group in wstat";`
		132	`char Eperm[] = "permission denied";`
		133	`char Especial0[] = "already attached without access to special files";`
		134	`char Especial1[] = "already attached with access to special files";`
		135	`char Especial[] = "no access to special file";`
		136	`char Etoolarge[] = "i/o count too large";`
		137	`char Eunknowngroup[] = "unknown group";`
		138	`char Eunknownuser[] = "unknown user";`
		139	`char Ewstatbuffer[] = "bogus wstat buffer";`
		140
		141	`ulong msize = IOHDRSZ+8192;`
		142	`uchar* rxbuf;`
		143	`uchar* txbuf;`
		144	`void* databuf;`
		145	`int connected;`
		146	`int devallowed;`
		147	`char* autharg;`
		148	`char* defaultuser;`
		149	`char hostname[256];`
		150	`char remotehostname[256];`
		151	`int chatty9p = 0;`
		152	`int network = 1;`
		153	`int old9p = -1;`
		154	`int authed;`
		155	`User* none;`
		156
		157	`Auth authmethods[] = { / first is default */`
		158	`&authrhosts,`
		159	`&authp9any,`
		160	`&authnone,`
		161	`};`
		162
		163	`Auth *auth;`
		164
65	7u83	165
		166
2	-	167	`/*`
		168	`* frogs: characters not valid in plan9`
		169	`* filenames, keep this list in sync with`
		170	`* /sys/src/9/port/chan.c:1656`
		171	`*/`
		172	`char isfrog[256]={`
		173	`/NUL/ 1, 1, 1, 1, 1, 1, 1, 1,`
		174	`/BKS/ 1, 1, 1, 1, 1, 1, 1, 1,`
		175	`/DLE/ 1, 1, 1, 1, 1, 1, 1, 1,`
		176	`/CAN/ 1, 1, 1, 1, 1, 1, 1, 1,`
70	7u83	177	`['/'] = 1,`
		178	`[0x7f] = 1,`
2	-	179	`};`
		180
65	7u83	181	`int groupchange(User u, User g, char **ep);`
		182
		183
		184
2	-	185	`void`
		186	`getfcallnew(int fd, Fcall *fc, int have)`
		187	`{`
		188	`int len;`
		189
		190	`if(have > BIT32SZ)`
		191	`sysfatal("cannot happen");`
		192
		193	`if(have < BIT32SZ && readn(fd, rxbuf+have, BIT32SZ-have) != BIT32SZ-have)`
		194	`sysfatal("couldn't read message");`
		195
		196	`len = GBIT32(rxbuf);`
		197	`if(len <= BIT32SZ)`
		198	`sysfatal("bogus message");`
		199
		200	`len -= BIT32SZ;`
		201	`if(readn(fd, rxbuf+BIT32SZ, len) != len)`
		202	`sysfatal("short message");`
		203
		204	`if(convM2S(rxbuf, len+BIT32SZ, fc) != len+BIT32SZ)`
		205	`sysfatal("badly sized message type %d", rxbuf[0]);`
		206	`}`
		207
		208	`void`
		209	`getfcallold(int fd, Fcall *fc, int have)`
		210	`{`
		211	`int len, n;`
		212
		213	`if(have > 3)`
		214	`sysfatal("cannot happen");`
		215
		216	`if(have < 3 && readn(fd, rxbuf, 3-have) != 3-have)`
		217	`sysfatal("couldn't read message");`
		218
		219	`len = oldhdrsize(rxbuf[0]);`
		220	`if(len < 3)`
		221	`sysfatal("bad message %d", rxbuf[0]);`
		222	`if(len > 3 && readn(fd, rxbuf+3, len-3) != len-3)`
		223	`sysfatal("couldn't read message");`
		224
		225	`n = iosize(rxbuf);`
		226	`if(readn(fd, rxbuf+len, n) != n)`
		227	`sysfatal("couldn't read message");`
		228	`len += n;`
		229
		230	`if(convM2Sold(rxbuf, len, fc) != len)`
		231	`sysfatal("badly sized message type %d", rxbuf[0]);`
		232	`}`
		233
		234	`void`
		235	`putfcallnew(int wfd, Fcall *tx)`
		236	`{`
		237	`uint n;`
		238
		239	`if((n = convS2M(tx, txbuf, msize)) == 0)`
		240	`sysfatal("couldn't format message type %d", tx->type);`
		241	`if(write(wfd, txbuf, n) != n)`
		242	`sysfatal("couldn't send message");`
		243	`}`
		244
		245	`void`
		246	`putfcallold(int wfd, Fcall *tx)`
		247	`{`
		248	`uint n;`
		249
		250	`if((n = convS2Mold(tx, txbuf, msize)) == 0)`
		251	`sysfatal("couldn't format message type %d", tx->type);`
		252	`if(write(wfd, txbuf, n) != n)`
		253	`sysfatal("couldn't send message");`
		254	`}`
		255
		256	`void`
		257	`getfcall(int fd, Fcall *fc)`
		258	`{`
		259	`if(old9p == 1){`
		260	`getfcallold(fd, fc, 0);`
		261	`return;`
		262	`}`
		263	`if(old9p == 0){`
		264	`getfcallnew(fd, fc, 0);`
		265	`return;`
		266	`}`
		267
		268	`/* auto-detect */`
		269	`if(readn(fd, rxbuf, 3) != 3)`
		270	`sysfatal("couldn't read message");`
		271
		272	`/* is it an old (9P1) message? */`
		273	`if(50 <= rxbuf[0] && rxbuf[0] <= 87 && (rxbuf[0]&1)==0 && GBIT16(rxbuf+1) == 0xFFFF){`
		274	`old9p = 1;`
		275	`getfcallold(fd, fc, 3);`
		276	`return;`
		277	`}`
		278
		279	`getfcallnew(fd, fc, 3);`
		280	`old9p = 0;`
		281	`}`
		282
		283	`void`
		284	`seterror(Fcall f, char error)`
		285	`{`
		286	`f->type = Rerror;`
		287	`f->ename = error ? error : "programmer error";`
		288	`}`
		289
		290	`int`
		291	`isowner(User u, Fid f)`
		292	`{`
		293	`return u->id == f->st.st_uid;`
		294	`}`
		295
		296
		297
		298	`void`
		299	`serve(int rfd, int wfd)`
		300	`{`
		301	`Fcall rx, tx;`
		302
		303	`for(;;){`
		304	`getfcall(rfd, &rx);`
		305
		306	`if(chatty9p)`
		307	`fprint(2, "<- %F\n", &rx);`
		308
		309	`memset(&tx, 0, sizeof tx);`
		310	`tx.type = rx.type+1;`
		311	`tx.tag = rx.tag;`
		312	`switch(rx.type){`
		313	`case Tflush:`
		314	`break;`
		315	`case Tversion:`
		316	`rversion(&rx, &tx);`
		317	`break;`
		318	`case Tauth:`
		319	`rauth(&rx, &tx);`
		320	`break;`
		321	`case Tattach:`
		322	`rattach(&rx, &tx);`
		323	`break;`
		324	`case Twalk:`
		325	`rwalk(&rx, &tx);`
		326	`break;`
		327	`case Tstat:`
		328	`tx.stat = databuf;`
		329	`rstat(&rx, &tx);`
		330	`break;`
		331	`case Twstat:`
		332	`rwstat(&rx, &tx);`
		333	`break;`
		334	`case Topen:`
		335	`ropen(&rx, &tx);`
		336	`break;`
		337	`case Tcreate:`
		338	`rcreate(&rx, &tx);`
		339	`break;`
		340	`case Tread:`
		341	`tx.data = databuf;`
		342	`rread(&rx, &tx);`
		343	`break;`
		344	`case Twrite:`
		345	`rwrite(&rx, &tx);`
		346	`break;`
		347	`case Tclunk:`
		348	`rclunk(&rx, &tx);`
		349	`break;`
		350	`case Tremove:`
		351	`rremove(&rx, &tx);`
		352	`break;`
		353	`default:`
		354	`fprint(2, "unknown message %F\n", &rx);`
		355	`seterror(&tx, "bad message");`
		356	`break;`
		357	`}`
		358
		359	`if(chatty9p)`
		360	`fprint(2, "-> %F\n", &tx);`
		361
		362	`(old9p ? putfcallold : putfcallnew)(wfd, &tx);`
		363	`}`
		364	`}`
		365
		366	`void`
		367	`rversion(Fcall rx, Fcall tx)`
		368	`{`
		369	`if(msize > rx->msize)`
		370	`msize = rx->msize;`
		371	`tx->msize = msize;`
		372	`if(strncmp(rx->version, "9P", 2) != 0)`
		373	`tx->version = "unknown";`
		374	`else`
		375	`tx->version = "9P2000";`
		376	`}`
		377
		378	`void`
		379	`rauth(Fcall rx, Fcall tx)`
		380	`{`
		381	`char *e;`
		382
		383	`if((e = auth->auth(rx, tx)) != nil)`
		384	`seterror(tx, e);`
		385	`}`
		386
		387	`void`
		388	`rattach(Fcall rx, Fcall tx)`
		389	`{`
		390	`char *e;`
		391	`Fid *fid;`
		392	`User *u;`
		393
		394	`if(rx->aname == nil)`
		395	`rx->aname = "";`
		396
		397	`if(strcmp(rx->aname, "device") == 0){`
		398	`if(connected && !devallowed){`
		399	`seterror(tx, Especial0);`
		400	`return;`
		401	`}`
		402	`devallowed = 1;`
		403	`}else{`
		404	`if(connected && devallowed){`
		405	`seterror(tx, Especial1);`
		406	`return;`
		407	`}`
		408	`}`
		409
		410	`if(strcmp(rx->uname, "none") == 0){`
		411	`if(authed == 0){`
		412	`seterror(tx, Eauth);`
		413	`return;`
		414	`}`
		415	`if (none != nil)`
		416	`rx->uname = none->name;`
		417	`} else {`
		418	`if((e = auth->attach(rx, tx)) != nil){`
		419	`seterror(tx, e);`
		420	`return;`
		421	`}`
		422	`authed++;`
		423	`}`
		424
		425	`if((fid = newfid(rx->fid, &e)) == nil){`
		426	`seterror(tx, e);`
		427	`return;`
		428	`}`
		429	`fid->path = estrdup("/");`
		430	`if(fidstat(fid, &e) < 0){`
		431	`seterror(tx, e);`
		432	`freefid(fid);`
		433	`return;`
		434	`}`
		435
		436	`if(defaultuser)`
		437	`rx->uname = defaultuser;`
		438
		439	`if((u = uname2user(rx->uname)) == nil`
		440	`\|\| (!defaultuser && u->id == 0)){`
		441	`/* we don't know anyone named root... */`
		442	`seterror(tx, Eunknownuser);`
		443	`freefid(fid);`
		444	`return;`
		445	`}`
		446
68	7u83	447
2	-	448	`fid->u = u;`
		449	`tx->qid = stat2qid(&fid->st);`
71	7u83	450
		451	`fprint(2,"Change root for user %s to %s\n",u->name,u->home_dir);`
		452	`chroot(u->home_dir);`
2	-	453	`return;`
		454	`}`
		455
		456	`void`
		457	`rwalk(Fcall rx, Fcall tx)`
		458	`{`
69	7u83	459
2	-	460	`int i;`
		461	`char path, e;`
		462	`Fid fid, nfid;`
		463
		464	`e = nil;`
		465	`if((fid = oldfid(rx->fid, &e)) == nil){`
		466	`seterror(tx, e);`
		467	`return;`
		468	`}`
		469
		470	`if(fid->omode != -1){`
		471	`seterror(tx, Ebadusefid);`
		472	`return;`
		473	`}`
		474
		475	`if(fidstat(fid, &e) < 0){`
		476	`seterror(tx, e);`
		477	`return;`
		478	`}`
		479
		480	`if(!S_ISDIR(fid->st.st_mode) && rx->nwname){`
		481	`seterror(tx, Enotdir);`
		482	`return;`
		483	`}`
		484
		485	`nfid = nil;`
		486	`if(rx->newfid != rx->fid && (nfid = newfid(rx->newfid, &e)) == nil){`
		487	`seterror(tx, e);`
		488	`return;`
		489	`}`
		490
		491	`path = estrdup(fid->path);`
		492	`e = nil;`
		493	`for(i=0; i<rx->nwname; i++)`
		494	`if(userwalk(fid->u, &path, rx->wname[i], &tx->wqid[i], &e) < 0)`
		495	`break;`
		496
		497	`if(i == rx->nwname){ /* successful clone or walk */`
		498	`tx->nwqid = i;`
		499	`if(nfid){`
		500	`nfid->path = path;`
		501	`nfid->u = fid->u;`
		502	`}else{`
		503	`free(fid->path);`
		504	`fid->path = path;`
		505	`}`
		506	`}else{`
		507	`if(i > 0) /* partial walk? */`
		508	`tx->nwqid = i;`
		509	`else`
		510	`seterror(tx, e);`
		511
		512	`if(nfid) /* clone implicit new fid */`
		513	`freefid(nfid);`
		514	`free(path);`
		515	`}`
		516	`return;`
		517	`}`
		518
		519	`void`
		520	`ropen(Fcall rx, Fcall tx)`
		521	`{`
		522	`char *e;`
		523	`Fid *fid;`
		524
		525	`if((fid = oldfid(rx->fid, &e)) == nil){`
		526	`seterror(tx, e);`
		527	`return;`
		528	`}`
		529
		530	`if(fid->omode != -1){`
		531	`seterror(tx, Ebadusefid);`
		532	`return;`
		533	`}`
		534
		535	`if(fidstat(fid, &e) < 0){`
		536	`seterror(tx, e);`
		537	`return;`
		538	`}`
		539
		540	`if(!devallowed && S_ISSPECIAL(fid->st.st_mode)){`
		541	`seterror(tx, Especial);`
		542	`return;`
		543	`}`
		544
		545	`if(useropen(fid, rx->mode, &e) < 0){`
		546	`seterror(tx, e);`
		547	`return;`
		548	`}`
		549
		550	`tx->iounit = 0;`
		551	`tx->qid = stat2qid(&fid->st);`
		552	`}`
		553
		554	`void`
		555	`rcreate(Fcall rx, Fcall tx)`
		556	`{`
		557	`char *e;`
		558	`Fid *fid;`
		559
		560	`if((fid = oldfid(rx->fid, &e)) == nil){`
71	7u83	561	`fprint(2,"oldfid error\n");`
2	-	562	`seterror(tx, e);`
		563	`return;`
		564	`}`
		565
		566	`if(fid->omode != -1){`
71	7u83	567	`fprint(2,"oldmode error\n");`
2	-	568	`seterror(tx, Ebadusefid);`
		569	`return;`
		570	`}`
		571
		572	`if(fidstat(fid, &e) < 0){`
71	7u83	573	`fprint(2,"fidstat error\n");`
2	-	574	`seterror(tx, e);`
		575	`return;`
		576	`}`
		577
		578	`if(!S_ISDIR(fid->st.st_mode)){`
71	7u83	579	`fprint(2,"isdir error\n");`
2	-	580	`seterror(tx, Enotdir);`
		581	`return;`
		582	`}`
		583
		584	`if(usercreate(fid, rx->name, rx->mode, rx->perm, &e) < 0){`
71	7u83	585	`fprint(2,"usercreate error\n");`
2	-	586	`seterror(tx, e);`
		587	`return;`
		588	`}`
		589
		590	`if(fidstat(fid, &e) < 0){`
71	7u83	591	`fprint(2,"fidstat again error\n");`
2	-	592	`seterror(tx, e);`
		593	`return;`
		594	`}`
		595
		596	`tx->iounit = 0;`
		597	`tx->qid = stat2qid(&fid->st);`
		598	`}`
		599
		600	`uchar`
		601	`modebyte(struct stat *st)`
		602	`{`
		603	`uchar b;`
		604
		605	`b = 0;`
		606
		607	`if(S_ISDIR(st->st_mode))`
		608	`b \|= QTDIR;`
		609
		610	`/* no way to test append-only */`
		611	`/* no real way to test exclusive use, but mark devices as such */`
		612	`if(S_ISSPECIAL(st->st_mode))`
		613	`b \|= QTEXCL;`
		614
		615	`return b;`
		616	`}`
		617
		618	`ulong`
		619	`plan9mode(struct stat *st)`
		620	`{`
		621	`return ((ulong)modebyte(st)<<24) \| (st->st_mode & 0777);`
		622	`}`
		623
		624	`/*`
		625	`* this is for chmod, so don't worry about S_IFDIR`
		626	`*/`
		627	`mode_t`
		628	`unixmode(Dir *d)`
		629	`{`
		630	`return (mode_t)(d->mode&0777);`
		631	`}`
		632
		633	`Qid`
		634	`stat2qid(struct stat *st)`
		635	`{`
		636	`uchar p, ep, *q;`
		637	`Qid qid;`
		638
		639	`/*`
		640	`* For now, ignore the device number.`
		641	`*/`
		642	`qid.path = 0;`
		643	`p = (uchar*)&qid.path;`
		644	`ep = p+sizeof(qid.path);`
		645	`q = p+sizeof(ino_t);`
		646	`if(q > ep){`
		647	`fprint(2, "warning: inode number too big\n");`
		648	`q = ep;`
		649	`}`
		650	`memmove(p, &st->st_ino, q-p);`
		651	`q = q+sizeof(dev_t);`
		652	`if(q > ep){`
		653	`/*`
		654	`* fprint(2, "warning: inode number + device number too big %d+%d\n",`
		655	`* sizeof(ino_t), sizeof(dev_t));`
		656	`*/`
		657	`q = ep - sizeof(dev_t);`
		658	`if(q < p)`
		659	`fprint(2, "warning: device number too big by itself\n");`
		660	`else`
		661	`(dev_t)q ^= st->st_dev;`
		662	`}`
		663
		664	`qid.vers = st->st_mtime ^ (st->st_size << 8);`
		665	`qid.type = modebyte(st);`
		666	`return qid;`
		667	`}`
		668
		669	`char *`
		670	`enfrog(char *src)`
		671	`{`
		672	`char d, dst;`
		673	`uchar *s;`
		674
		675	`d = dst = emalloc(strlen(src)*3 + 1);`
		676	`for (s = (uchar )src; s; s++)`
		677	`if(isfrog[s] \|\| s == '\\')`
		678	`d += sprintf(d, "\\%02x", *s);`
		679	`else`
		680	`d++ = s;`
		681	`*d = 0;`
		682	`return dst;`
		683	`}`
		684
		685	`char *`
		686	`defrog(char *s)`
		687	`{`
		688	`char d, dst, buf[3];`
		689
		690	`d = dst = emalloc(strlen(s) + 1);`
		691	`for(; *s; s++)`
		692	`if(*s == '\\' && strlen(s) >= 3){`
		693	`buf[0] = ++s; / skip \ */`
		694	`buf[1] = *++s;`
		695	`buf[2] = 0;`
		696	`*d++ = strtoul(buf, NULL, 16);`
		697	`} else`
		698	`d++ = s;`
		699	`*d = 0;`
		700	`return dst;`
		701	`}`
		702
		703	`void`
		704	`stat2dir(char path, struct stat st, Dir *d)`
		705	`{`
		706	`User *u;`
		707	`char q, p, *npath;`
		708
		709	`memset(d, 0, sizeof(*d));`
		710	`d->qid = stat2qid(st);`
		711	`d->mode = plan9mode(st);`
		712	`d->atime = st->st_atime;`
		713	`d->mtime = st->st_mtime;`
		714	`d->length = st->st_size;`
		715
		716	`d->uid = (u = uid2user(st->st_uid)) ? u->name : "???";`
		717	`d->gid = (u = gid2user(st->st_gid)) ? u->name : "???";`
		718	`d->muid = "";`
		719
		720	`if((q = strrchr(path, '/')) != nil)`
		721	`d->name = enfrog(q+1);`
		722	`else`
		723	`d->name = enfrog(path);`
		724	`}`
		725
		726	`void`
		727	`rread(Fcall rx, Fcall tx)`
		728	`{`
		729	`char e, path;`
		730	`uchar p, ep;`
		731	`int n;`
		732	`Fid *fid;`
		733	`Dir d;`
		734	`struct stat st;`
		735
		736	`if(rx->count > msize-IOHDRSZ){`
		737	`seterror(tx, Etoolarge);`
		738	`return;`
		739	`}`
		740
		741	`if((fid = oldfidex(rx->fid, -1, &e)) == nil){`
		742	`seterror(tx, e);`
		743	`return;`
		744	`}`
		745
		746	`if (fid->auth) {`
		747	`char *e;`
		748	`e = auth->read(rx, tx);`
		749	`if (e)`
		750	`seterror(tx, e);`
		751	`return;`
		752	`}`
		753
		754	`if(fid->omode == -1 \|\| (fid->omode&3) == OWRITE){`
		755	`seterror(tx, Ebadusefid);`
		756	`return;`
		757	`}`
		758
		759	`if(fid->dir){`
		760	`if(rx->offset != fid->diroffset){`
		761	`if(rx->offset != 0){`
		762	`seterror(tx, Ebadoffset);`
		763	`return;`
		764	`}`
		765	`rewinddir(fid->dir);`
		766	`fid->diroffset = 0;`
		767	`fid->direof = 0;`
		768	`}`
		769	`if(fid->direof){`
		770	`tx->count = 0;`
		771	`return;`
		772	`}`
		773
		774	`p = (uchar*)tx->data;`
		775	`ep = (uchar*)tx->data+rx->count;`
		776	`for(;;){`
		777	`if(p+BIT16SZ >= ep)`
		778	`break;`
		779	`if(fid->dirent == nil) /* one entry cache for when convD2M fails */`
		780	`if((fid->dirent = readdir(fid->dir)) == nil){`
		781	`fid->direof = 1;`
		782	`break;`
		783	`}`
		784	`if(strcmp(fid->dirent->d_name, ".") == 0`
		785	`\|\| strcmp(fid->dirent->d_name, "..") == 0){`
		786	`fid->dirent = nil;`
		787	`continue;`
		788	`}`
		789	`path = estrpath(fid->path, fid->dirent->d_name, 0);`
		790	`memset(&st, 0, sizeof st);`
		791	`if(stat(path, &st) < 0){`
		792	`fprint(2, "dirread: stat(%s) failed: %s\n", path, strerror(errno));`
		793	`fid->dirent = nil;`
		794	`free(path);`
		795	`continue;`
		796	`}`
		797	`free(path);`
		798	`stat2dir(fid->dirent->d_name, &st, &d);`
		799	`if((n=(old9p ? convD2Mold : convD2M)(&d, p, ep-p)) <= BIT16SZ)`
		800	`break;`
		801	`p += n;`
		802	`fid->dirent = nil;`
		803	`}`
		804	`tx->count = p - (uchar*)tx->data;`
		805	`fid->diroffset += tx->count;`
		806	`}else{`
		807	`if((n = pread(fid->fd, tx->data, rx->count, rx->offset)) < 0){`
		808	`seterror(tx, strerror(errno));`
		809	`return;`
		810	`}`
		811	`tx->count = n;`
		812	`}`
		813	`}`
		814
		815	`void`
		816	`rwrite(Fcall rx, Fcall tx)`
		817	`{`
		818	`char *e;`
		819	`Fid *fid;`
		820	`int n;`
		821
		822	`if(rx->count > msize-IOHDRSZ){`
		823	`seterror(tx, Etoolarge);`
		824	`return;`
		825	`}`
		826
		827	`if((fid = oldfidex(rx->fid, -1, &e)) == nil){`
		828	`seterror(tx, e);`
		829	`return;`
		830	`}`
		831
		832	`if (fid->auth) {`
		833	`char *e;`
		834	`e = auth->write(rx, tx);`
		835	`if (e)`
		836	`seterror(tx, e);`
		837	`return;`
		838	`}`
		839
		840	`if(fid->omode == -1 \|\| (fid->omode&3) == OREAD \|\| (fid->omode&3) == OEXEC){`
		841	`seterror(tx, Ebadusefid);`
		842	`return;`
		843	`}`
		844
		845	`if((n = pwrite(fid->fd, rx->data, rx->count, rx->offset)) < 0){`
		846	`seterror(tx, strerror(errno));`
		847	`return;`
		848	`}`
		849	`tx->count = n;`
		850	`}`
		851
		852	`void`
		853	`rclunk(Fcall rx, Fcall tx)`
		854	`{`
		855	`char *e;`
		856	`Fid *fid;`
		857
		858	`if((fid = oldfidex(rx->fid, -1, &e)) == nil){`
		859	`seterror(tx, e);`
		860	`return;`
		861	`}`
		862	`if (fid->auth) {`
		863	`if (auth->clunk) {`
		864	`e = (*auth->clunk)(rx, tx);`
		865	`if (e) {`
		866	`seterror(tx, e);`
		867	`return;`
		868	`}`
		869	`}`
		870	`}`
		871	`else if(fid->omode != -1 && fid->omode&ORCLOSE)`
		872	`remove(fid->path);`
		873	`freefid(fid);`
		874	`}`
		875
		876	`void`
		877	`rremove(Fcall rx, Fcall tx)`
		878	`{`
		879	`char *e;`
		880	`Fid *fid;`
		881
		882	`if((fid = oldfid(rx->fid, &e)) == nil){`
		883	`seterror(tx, e);`
		884	`return;`
		885	`}`
		886	`if(userremove(fid, &e) < 0)`
		887	`seterror(tx, e);`
		888	`freefid(fid);`
		889	`}`
		890
		891	`void`
		892	`rstat(Fcall rx, Fcall tx)`
		893	`{`
		894	`char *e;`
		895	`Fid *fid;`
		896	`Dir d;`
		897
		898	`if((fid = oldfid(rx->fid, &e)) == nil){`
		899	`seterror(tx, e);`
		900	`return;`
		901	`}`
		902
		903	`if(fidstat(fid, &e) < 0){`
		904	`seterror(tx, e);`
		905	`return;`
		906	`}`
		907
		908	`stat2dir(fid->path, &fid->st, &d);`
		909	`if((tx->nstat=(old9p ? convD2Mold : convD2M)(&d, tx->stat, msize)) <= BIT16SZ)`
		910	`seterror(tx, "convD2M fails");`
		911	`}`
		912
		913	`void`
		914	`rwstat(Fcall rx, Fcall tx)`
		915	`{`
		916	`char *e;`
		917	`char p, old, new, dir;`
		918	`gid_t gid;`
		919	`Dir d;`
		920	`Fid *fid;`
		921
		922	`if((fid = oldfid(rx->fid, &e)) == nil){`
		923	`seterror(tx, e);`
		924	`return;`
		925	`}`
		926
		927	`/*`
		928	`* wstat is supposed to be atomic.`
		929	`* we check all the things we can before trying anything.`
		930	`* still, if we are told to truncate a file and rename it and only`
		931	`* one works, we're screwed. in such cases we leave things`
		932	`* half broken and return an error. it's hardly perfect.`
		933	`*/`
		934	`if((old9p ? convM2Dold : convM2D)(rx->stat, rx->nstat, &d, (char*)rx->stat) <= BIT16SZ){`
		935	`seterror(tx, Ewstatbuffer);`
		936	`return;`
		937	`}`
		938
		939	`if(fidstat(fid, &e) < 0){`
		940	`seterror(tx, e);`
		941	`return;`
		942	`}`
		943
		944	`/*`
		945	`* The casting is necessary because d.mode is ulong and might,`
		946	`* on some systems, be 64 bits. We only want to compare the`
		947	`* bottom 32 bits, since that's all that gets sent in the protocol.`
		948	`*`
		949	`* Same situation for d.mtime and d.length (although that last check`
		950	`* is admittedly superfluous, given the current lack of 128-bit machines).`
		951	`*/`
		952	`gid = (gid_t)-1;`
		953	`if(d.gid[0] != '\0'){`
		954	`User *g;`
		955
		956	`g = gname2user(d.gid);`
		957	`if(g == nil){`
		958	`seterror(tx, Eunknowngroup);`
		959	`return;`
		960	`}`
		961	`gid = (gid_t)g->id;`
		962
		963	`if(groupchange(fid->u, gid2user(gid), &e) < 0){`
		964	`seterror(tx, e);`
		965	`return;`
		966	`}`
		967	`}`
		968
		969	`if((u32int)d.mode != (u32int)~0 && (((d.mode&DMDIR)!=0) ^ (S_ISDIR(fid->st.st_mode)!=0))){`
		970	`seterror(tx, Edirchange);`
		971	`return;`
		972	`}`
		973
		974	`if(strcmp(fid->path, "/") == 0){`
		975	`seterror(tx, "no wstat of root");`
		976	`return;`
		977	`}`
		978
		979	`/*`
		980	`* try things in increasing order of harm to the file.`
		981	`* mtime should come after truncate so that if you`
		982	`* do both the mtime actually takes effect, but i'd rather`
		983	`* leave truncate until last.`
		984	`* (see above comment about atomicity).`
		985	`*/`
		986	`if((u32int)d.mode != (u32int)~0 && chmod(fid->path, unixmode(&d)) < 0){`
		987	`if(chatty9p)`
		988	`fprint(2, "chmod(%s, 0%luo) failed\n", fid->path, unixmode(&d));`
		989	`seterror(tx, strerror(errno));`
		990	`return;`
		991	`}`
		992
		993	`if((u32int)d.mtime != (u32int)~0){`
		994	`struct utimbuf t;`
		995
		996	`t.actime = 0;`
		997	`t.modtime = d.mtime;`
		998	`if(utime(fid->path, &t) < 0){`
		999	`if(chatty9p)`
		1000	`fprint(2, "utime(%s) failed\n", fid->path);`
		1001	`seterror(tx, strerror(errno));`
		1002	`return;`
		1003	`}`
		1004	`}`
		1005
		1006	`if(gid != (gid_t)-1 && gid != fid->st.st_gid){`
		1007	`if(chown(fid->path, (uid_t)-1, gid) < 0){`
		1008	`if(chatty9p)`
		1009	`fprint(2, "chgrp(%s, %d) failed\n", fid->path, gid);`
		1010	`seterror(tx, strerror(errno));`
		1011	`return;`
		1012	`}`
		1013	`}`
		1014
		1015	`if(d.name[0]){`
		1016	`old = fid->path;`
		1017	`dir = estrdup(fid->path);`
		1018	`if((p = strrchr(dir, '/')) > dir)`
		1019	`*p = '\0';`
		1020	`else{`
		1021	`seterror(tx, "whoops: can't happen in u9fs");`
		1022	`return;`
		1023	`}`
		1024	`new = estrpath(dir, d.name, 1);`
		1025	`if(strcmp(old, new) != 0 && rename(old, new) < 0){`
		1026	`if(chatty9p)`
		1027	`fprint(2, "rename(%s, %s) failed\n", old, new);`
		1028	`seterror(tx, strerror(errno));`
		1029	`free(new);`
		1030	`free(dir);`
		1031	`return;`
		1032	`}`
		1033	`fid->path = new;`
		1034	`free(old);`
		1035	`free(dir);`
		1036	`}`
		1037
		1038	`if((u64int)d.length != (u64int)~0 && truncate(fid->path, d.length) < 0){`
		1039	`fprint(2, "truncate(%s, %lld) failed\n", fid->path, d.length);`
		1040	`seterror(tx, strerror(errno));`
		1041	`return;`
		1042	`}`
		1043	`}`
		1044
		1045	`/*`
		1046	`* we keep a table by numeric id. by name lookups happen infrequently`
		1047	`* while by-number lookups happen once for every directory entry read`
		1048	`* and every stat request.`
		1049	`*/`
		1050	`User *utab[64];`
		1051	`User *gtab[64];`
		1052
		1053	`User*`
		1054	`adduser(struct passwd *p)`
		1055	`{`
		1056	`User *u;`
		1057
		1058	`u = emalloc(sizeof(*u));`
		1059	`u->id = p->pw_uid;`
		1060	`u->name = estrdup(p->pw_name);`
		1061	`u->next = utab[p->pw_uid%nelem(utab)];`
		1062	`u->defaultgid = p->pw_gid;`
71	7u83	1063	`if (p->pw_dir != nil ){`
		1064	`int n;`
		1065	`strncpy(u->home_dir,p->pw_dir,PATH_MAX);`
		1066	`u->home_dir[PATH_MAX-1]=0;`
		1067	`}`
		1068	`else {`
		1069	`strcpy(u->home_dir,"/");`
		1070	`}`
2	-	1071	`utab[p->pw_uid%nelem(utab)] = u;`
		1072	`return u;`
		1073	`}`
		1074
		1075	`int`
		1076	`useringroup(User u, User g)`
		1077	`{`
		1078	`int i;`
		1079
		1080	`for(i=0; i<g->nmem; i++)`
		1081	`if(strcmp(g->mem[i], u->name) == 0)`
		1082	`return 1;`
		1083
		1084	`/*`
		1085	`* Hack around common Unix problem that everyone has`
		1086	`* default group "user" but /etc/group lists no members.`
		1087	`*/`
		1088	`if(u->defaultgid == g->id)`
		1089	`return 1;`
		1090	`return 0;`
		1091	`}`
		1092
		1093	`User*`
		1094	`addgroup(struct group *g)`
		1095	`{`
		1096	`User *u;`
		1097	`char **p;`
		1098	`int n;`
		1099
		1100	`u = emalloc(sizeof(*u));`
		1101	`n = 0;`
		1102	`for(p=g->gr_mem; *p; p++)`
		1103	`n++;`
		1104	`u->mem = emalloc(sizeof(u->mem[0])*n);`
		1105	`n = 0;`
		1106	`for(p=g->gr_mem; *p; p++)`
		1107	`u->mem[n++] = estrdup(*p);`
		1108	`u->nmem = n;`
		1109	`u->id = g->gr_gid;`
		1110	`u->name = estrdup(g->gr_name);`
		1111	`u->next = gtab[g->gr_gid%nelem(gtab)];`
		1112	`gtab[g->gr_gid%nelem(gtab)] = u;`
		1113	`return u;`
		1114	`}`
		1115
		1116	`User*`
		1117	`uname2user(char *name)`
		1118	`{`
		1119	`int i;`
		1120	`User *u;`
		1121	`struct passwd *p;`
		1122
		1123	`for(i=0; i<nelem(utab); i++)`
		1124	`for(u=utab[i]; u; u=u->next)`
		1125	`if(strcmp(u->name, name) == 0)`
		1126	`return u;`
		1127
		1128	`if((p = getpwnam(name)) == nil)`
		1129	`return nil;`
		1130	`return adduser(p);`
		1131	`}`
		1132
		1133	`User*`
		1134	`uid2user(int id)`
		1135	`{`
		1136	`User *u;`
		1137	`struct passwd *p;`
		1138
		1139	`for(u=utab[id%nelem(utab)]; u; u=u->next)`
		1140	`if(u->id == id)`
		1141	`return u;`
		1142
		1143	`if((p = getpwuid(id)) == nil)`
		1144	`return nil;`
		1145	`return adduser(p);`
		1146	`}`
		1147
		1148	`User*`
		1149	`gname2user(char *name)`
		1150	`{`
		1151	`int i;`
		1152	`User *u;`
		1153	`struct group *g;`
		1154
		1155	`for(i=0; i<nelem(gtab); i++)`
		1156	`for(u=gtab[i]; u; u=u->next)`
		1157	`if(strcmp(u->name, name) == 0)`
		1158	`return u;`
		1159
		1160	`if((g = getgrnam(name)) == nil)`
		1161	`return nil;`
		1162	`return addgroup(g);`
		1163	`}`
		1164
		1165	`User*`
		1166	`gid2user(int id)`
		1167	`{`
		1168	`User *u;`
		1169	`struct group *g;`
		1170
		1171	`for(u=gtab[id%nelem(gtab)]; u; u=u->next)`
		1172	`if(u->id == id)`
		1173	`return u;`
		1174
		1175	`if((g = getgrgid(id)) == nil)`
		1176	`return nil;`
		1177	`return addgroup(g);`
		1178	`}`
		1179
		1180	`void`
		1181	`sysfatal(char *fmt, ...)`
		1182	`{`
		1183	`char buf[1024];`
		1184	`va_list va, temp;`
		1185
		1186	`va_start(va, fmt);`
		1187	`va_copy(temp, va);`
		1188	`doprint(buf, buf+sizeof buf, fmt, &temp);`
		1189	`va_end(temp);`
		1190	`va_end(va);`
		1191	`fprint(2, "u9fs: %s\n", buf);`
		1192	`fprint(2, "last unix error: %s\n", strerror(errno));`
		1193	`exit(1);`
		1194	`}`
		1195
		1196	`void*`
		1197	`emalloc(size_t n)`
		1198	`{`
		1199	`void *p;`
		1200
		1201	`if(n == 0)`
		1202	`n = 1;`
		1203	`p = malloc(n);`
		1204	`if(p == 0)`
		1205	`sysfatal("malloc(%ld) fails", (long)n);`
		1206	`memset(p, 0, n);`
		1207	`return p;`
		1208	`}`
		1209
		1210	`void*`
		1211	`erealloc(void *p, size_t n)`
		1212	`{`
		1213	`if(p == 0)`
		1214	`p = malloc(n);`
		1215	`else`
		1216	`p = realloc(p, n);`
		1217	`if(p == 0)`
		1218	`sysfatal("realloc(..., %ld) fails", (long)n);`
		1219	`return p;`
		1220	`}`
		1221
		1222	`char*`
		1223	`estrdup(char *p)`
		1224	`{`
		1225	`p = strdup(p);`
		1226	`if(p == 0)`
		1227	`sysfatal("strdup(%.20s) fails", p);`
		1228	`return p;`
		1229	`}`
		1230
		1231	`char*`
		1232	`estrpath(char p, char q, int frog)`
		1233	`{`
		1234	`char r, s;`
		1235
		1236	`if(strcmp(q, "..") == 0){`
		1237	`r = estrdup(p);`
		1238	`if((s = strrchr(r, '/')) && s > r)`
		1239	`*s = '\0';`
		1240	`else if(s == r)`
		1241	`s[1] = '\0';`
		1242	`return r;`
		1243	`}`
		1244
		1245	`if(frog)`
		1246	`q = defrog(q);`
		1247	`else`
		1248	`q = strdup(q);`
		1249	`r = emalloc(strlen(p)+1+strlen(q)+1);`
		1250	`strcpy(r, p);`
		1251	`if(r[0]=='\0' \|\| r[strlen(r)-1] != '/')`
		1252	`strcat(r, "/");`
		1253	`strcat(r, q);`
		1254	`free(q);`
		1255	`return r;`
		1256	`}`
		1257
		1258	`Fid *fidtab[1];`
		1259
		1260	`Fid*`
		1261	`lookupfid(int fid)`
		1262	`{`
		1263	`Fid *f;`
		1264
		1265	`for(f=fidtab[fid%nelem(fidtab)]; f; f=f->next)`
		1266	`if(f->fid == fid)`
		1267	`return f;`
		1268	`return nil;`
		1269	`}`
		1270
		1271	`Fid*`
		1272	`newfid(int fid, char **ep)`
		1273	`{`
		1274	`Fid *f;`
		1275
		1276	`if(lookupfid(fid) != nil){`
		1277	`*ep = Efidactive;`
		1278	`return nil;`
		1279	`}`
		1280
		1281	`f = emalloc(sizeof(*f));`
		1282	`f->next = fidtab[fid%nelem(fidtab)];`
		1283	`if(f->next)`
		1284	`f->next->prev = f;`
		1285	`fidtab[fid%nelem(fidtab)] = f;`
		1286	`f->fid = fid;`
		1287	`f->fd = -1;`
		1288	`f->omode = -1;`
		1289	`return f;`
		1290	`}`
		1291
		1292	`Fid*`
		1293	`newauthfid(int fid, void magic, char *ep)`
		1294	`{`
		1295	`Fid *af;`
		1296	`af = newfid(fid, ep);`
		1297	`if (af == nil)`
		1298	`return nil;`
		1299	`af->auth = 1;`
		1300	`af->authmagic = magic;`
		1301	`return af;`
		1302	`}`
		1303
		1304	`Fid*`
		1305	`oldfidex(int fid, int auth, char **ep)`
		1306	`{`
		1307	`Fid *f;`
		1308
		1309	`if((f = lookupfid(fid)) == nil){`
		1310	`*ep = Ebadfid;`
		1311	`return nil;`
		1312	`}`
		1313
		1314	`if (auth != -1 && f->auth != auth) {`
		1315	`*ep = Ebadfid;`
		1316	`return nil;`
		1317	`}`
		1318
		1319	`if (!f->auth) {`
		1320	`if(userchange(f->u, ep) < 0)`
		1321	`return nil;`
		1322	`}`
		1323
		1324	`return f;`
		1325	`}`
		1326
		1327	`Fid*`
		1328	`oldfid(int fid, char **ep)`
		1329	`{`
		1330	`return oldfidex(fid, 0, ep);`
		1331	`}`
		1332
		1333	`Fid*`
		1334	`oldauthfid(int fid, void magic, char ep)`
		1335	`{`
		1336	`Fid *af;`
		1337	`af = oldfidex(fid, 1, ep);`
		1338	`if (af == nil)`
		1339	`return nil;`
		1340	`*magic = af->authmagic;`
		1341	`return af;`
		1342	`}`
		1343
		1344	`void`
		1345	`freefid(Fid *f)`
		1346	`{`
		1347	`if(f->prev)`
		1348	`f->prev->next = f->next;`
		1349	`else`
		1350	`fidtab[f->fid%nelem(fidtab)] = f->next;`
		1351	`if(f->next)`
		1352	`f->next->prev = f->prev;`
		1353	`if(f->dir)`
		1354	`closedir(f->dir);`
		1355	`if(f->fd)`
		1356	`close(f->fd);`
		1357	`free(f->path);`
		1358	`free(f);`
		1359	`}`
		1360
		1361	`int`
		1362	`fidstat(Fid fid, char *ep)`
		1363	`{`
		1364	`if(stat(fid->path, &fid->st) < 0){`
		1365	`fprint(2, "fidstat(%s) failed\n", fid->path);`
		1366	`if(ep)`
		1367	`*ep = strerror(errno);`
		1368	`return -1;`
		1369	`}`
		1370	`if(S_ISDIR(fid->st.st_mode))`
		1371	`fid->st.st_size = 0;`
		1372	`return 0;`
		1373	`}`
		1374
		1375	`int`
		1376	`userchange(User u, char *ep)`
		1377	`{`
		1378	`if(defaultuser)`
		1379	`return 0;`
		1380
		1381	`if(setreuid(0, 0) < 0){`
		1382	`fprint(2, "setreuid(0, 0) failed\n");`
		1383	`*ep = "cannot setuid back to root";`
		1384	`return -1;`
		1385	`}`
		1386
		1387	`/*`
		1388	`* Initgroups does not appear to be SUSV standard.`
		1389	`* But it exists on SGI and on Linux, which makes me`
		1390	`* think it's standard enough. We have to do something`
		1391	`* like this, and the closest other function I can find is`
		1392	`* setgroups (which initgroups eventually calls).`
		1393	`* Setgroups is the same as far as standardization though,`
		1394	`* so we're stuck using a non-SUSV call. Sigh.`
		1395	`*/`
		1396	`if(initgroups(u->name, u->defaultgid) < 0)`
		1397	`fprint(2, "initgroups(%s) failed: %s\n", u->name, strerror(errno));`
		1398
		1399	`if(setreuid(-1, u->id) < 0){`
		1400	`fprint(2, "setreuid(-1, %s) failed\n", u->name);`
		1401	`*ep = strerror(errno);`
		1402	`return -1;`
		1403	`}`
		1404
		1405	`return 0;`
		1406	`}`
		1407
		1408	`/*`
		1409	`* We do our own checking here, then switch to root temporarily`
		1410	`* to set our gid. In a perfect world, you'd be allowed to set your`
		1411	`* egid to any of the supplemental groups of your euid, but this`
		1412	`* is not the case on Linux 2.2.14 (and perhaps others).`
		1413	`*`
		1414	`* This is a race, of course, but it's a race against processes`
		1415	`* that can edit the group lists. If you can do that, you can`
		1416	`* change your own group without our help.`
		1417	`*/`
		1418	`int`
		1419	`groupchange(User u, User g, char **ep)`
		1420	`{`
		1421	`if(g == nil)`
		1422	`return -1;`
		1423	`if(!useringroup(u, g)){`
		1424	`if(chatty9p)`
		1425	`fprint(2, "%s not in group %s\n", u->name, g->name);`
		1426	`*ep = Enotingroup;`
		1427	`return -1;`
		1428	`}`
		1429
		1430	`setreuid(0,0);`
		1431	`if(setregid(-1, g->id) < 0){`
		1432	`fprint(2, "setegid(%s/%d) failed in groupchange\n", g->name, g->id);`
		1433	`*ep = strerror(errno);`
		1434	`return -1;`
		1435	`}`
		1436	`if(userchange(u, ep) < 0)`
		1437	`return -1;`
		1438
		1439	`return 0;`
		1440	`}`
		1441
		1442
		1443	`/*`
		1444	`* An attempt to enforce permissions by looking at the`
		1445	`* file system. Separation of checking permission and`
		1446	`* actually performing the action is a terrible idea, of`
		1447	`* course, so we use setreuid for most of the permission`
		1448	`* enforcement. This is here only so we can give errors`
		1449	`* on open(ORCLOSE) in some cases.`
		1450	`*/`
		1451	`int`
		1452	`userperm(User u, char path, int type, int need)`
		1453	`{`
		1454	`char p, q;`
		1455	`int i, have;`
		1456	`struct stat st;`
		1457	`User *g;`
		1458
		1459	`switch(type){`
		1460	`default:`
		1461	`fprint(2, "bad type %d in userperm\n", type);`
		1462	`return -1;`
		1463	`case Tdot:`
		1464	`if(stat(path, &st) < 0){`
		1465	`fprint(2, "userperm: stat(%s) failed\n", path);`
		1466	`return -1;`
		1467	`}`
		1468	`break;`
		1469	`case Tdotdot:`
		1470	`p = estrdup(path);`
		1471	`if((q = strrchr(p, '/'))==nil){`
		1472	`fprint(2, "userperm(%s, ..): bad path\n", p);`
		1473	`free(p);`
		1474	`return -1;`
		1475	`}`
		1476	`if(q > p)`
		1477	`*q = '\0';`
		1478	`else`
		1479	`*(q+1) = '\0';`
		1480	`if(stat(p, &st) < 0){`
		1481	`fprint(2, "userperm: stat(%s) (dotdot of %s) failed\n",`
		1482	`p, path);`
		1483	`free(p);`
		1484	`return -1;`
		1485	`}`
		1486	`free(p);`
		1487	`break;`
		1488	`}`
		1489
		1490	`if(u == none){`
		1491	`fprint(2, "userperm: none wants %d in 0%luo\n", need, st.st_mode);`
		1492	`have = st.st_mode&7;`
		1493	`if((have&need)==need)`
		1494	`return 0;`
		1495	`return -1;`
		1496	`}`
		1497	`have = st.st_mode&7;`
		1498	`if((uid_t)u->id == st.st_uid)`
		1499	`have \|= (st.st_mode>>6)&7;`
		1500	`if((have&need)==need)`
		1501	`return 0;`
		1502	`if(((have\|((st.st_mode>>3)&7))&need) != need) /* group won't help */`
		1503	`return -1;`
		1504	`g = gid2user(st.st_gid);`
		1505	`for(i=0; i<g->nmem; i++){`
		1506	`if(strcmp(g->mem[i], u->name) == 0){`
		1507	`have \|= (st.st_mode>>3)&7;`
		1508	`break;`
		1509	`}`
		1510	`}`
		1511	`if((have&need)==need)`
		1512	`return 0;`
		1513	`return -1;`
		1514	`}`
		1515
		1516	`int`
		1517	`userwalk(User u, char path, char elem, Qid qid, char *ep)`
		1518	`{`
		1519	`char *npath;`
		1520	`struct stat st;`
		1521
		1522	`npath = estrpath(*path, elem, 1);`
		1523	`if(stat(npath, &st) < 0){`
		1524	`free(npath);`
		1525	`*ep = strerror(errno);`
		1526	`return -1;`
		1527	`}`
		1528	`*qid = stat2qid(&st);`
		1529	`free(*path);`
		1530	`*path = npath;`
		1531	`return 0;`
		1532	`}`
		1533
		1534	`int`
		1535	`useropen(Fid fid, int omode, char *ep)`
		1536	`{`
		1537	`int a, o;`
		1538
		1539	`/*`
		1540	`* Check this anyway, to try to head off problems later.`
		1541	`*/`
		1542	`if((omode&ORCLOSE) && userperm(fid->u, fid->path, Tdotdot, W_OK) < 0){`
		1543	`*ep = Eperm;`
		1544	`return -1;`
		1545	`}`
		1546
		1547	`switch(omode&3){`
		1548	`default:`
		1549	`*ep = "programmer error";`
		1550	`return -1;`
		1551	`case OREAD:`
		1552	`a = R_OK;`
		1553	`o = O_RDONLY;`
		1554	`break;`
		1555	`case ORDWR:`
		1556	`a = R_OK\|W_OK;`
		1557	`o = O_RDWR;`
		1558	`break;`
		1559	`case OWRITE:`
		1560	`a = W_OK;`
		1561	`o = O_WRONLY;`
		1562	`break;`
		1563	`case OEXEC:`
		1564	`a = X_OK;`
		1565	`o = O_RDONLY;`
		1566	`break;`
		1567	`}`
		1568	`if(omode & OTRUNC){`
		1569	`a \|= W_OK;`
		1570	`o \|= O_TRUNC;`
		1571	`}`
		1572
		1573	`if(S_ISDIR(fid->st.st_mode)){`
		1574	`if(a != R_OK){`
		1575	`fprint(2, "attempt by %s to open dir %d\n", fid->u->name, omode);`
		1576	`*ep = Eperm;`
		1577	`return -1;`
		1578	`}`
		1579	`if((fid->dir = opendir(fid->path)) == nil){`
		1580	`*ep = strerror(errno);`
		1581	`return -1;`
		1582	`}`
		1583	`}else{`
		1584	`/*`
		1585	`* This is wrong because access used the real uid`
		1586	`* and not the effective uid. Let the open sort it out.`
		1587	`*`
		1588	`if(access(fid->path, a) < 0){`
		1589	`*ep = strerror(errno);`
		1590	`return -1;`
		1591	`}`
		1592	`*`
		1593	`*/`
		1594	`if((fid->fd = open(fid->path, o)) < 0){`
		1595	`*ep = strerror(errno);`
		1596	`return -1;`
		1597	`}`
		1598	`}`
		1599	`fid->omode = omode;`
		1600	`return 0;`
		1601	`}`
		1602
		1603	`int`
		1604	`usercreate(Fid fid, char elem, int omode, long perm, char **ep)`
		1605	`{`
		1606	`int o, m;`
		1607	`char opath, npath;`
		1608	`struct stat st, parent;`
71	7u83	1609	`fprint(2,"Called user create\n");`
2	-	1610
		1611	`if(stat(fid->path, &parent) < 0){`
		1612	`*ep = strerror(errno);`
		1613	`return -1;`
		1614	`}`
		1615
		1616	`/*`
		1617	`* Change group so that created file has expected group`
		1618	`* by Plan 9 semantics. If that fails, might as well go`
		1619	`* with the user's default group.`
		1620	`*/`
		1621	`if(groupchange(fid->u, gid2user(parent.st_gid), ep) < 0`
71	7u83	1622	`&& groupchange(fid->u, gid2user(fid->u->defaultgid), ep) < 0) {`
		1623
		1624	`fprint(2, "usercreate grouchange error %d\n",fid->u->defaultgid);`
2	-	1625	`return -1;`
71	7u83	1626	`}`
2	-	1627
		1628	`m = (perm & DMDIR) ? 0777 : 0666;`
		1629	`perm = perm & (~m \| (fid->st.st_mode & m));`
		1630
		1631	`npath = estrpath(fid->path, elem, 1);`
		1632	`if(perm & DMDIR){`
		1633	`if((omode&~ORCLOSE) != OREAD){`
		1634	`*ep = Eperm;`
		1635	`free(npath);`
		1636	`return -1;`
		1637	`}`
		1638	`if(stat(npath, &st) >= 0 \|\| errno != ENOENT){`
		1639	`*ep = Eexist;`
		1640	`free(npath);`
		1641	`return -1;`
		1642	`}`
		1643	`/* race */`
		1644	`if(mkdir(npath, (perm\|0400)&0777) < 0){`
		1645	`*ep = strerror(errno);`
		1646	`free(npath);`
		1647	`return -1;`
		1648	`}`
		1649	`if((fid->dir = opendir(npath)) == nil){`
		1650	`*ep = strerror(errno);`
		1651	`remove(npath); /* race */`
		1652	`free(npath);`
		1653	`return -1;`
		1654	`}`
		1655	`}else{`
		1656	`o = O_CREAT\|O_EXCL;`
		1657	`switch(omode&3){`
		1658	`default:`
		1659	`*ep = "programmer error";`
		1660	`return -1;`
		1661	`case OREAD:`
		1662	`case OEXEC:`
		1663	`o \|= O_RDONLY;`
		1664	`break;`
		1665	`case ORDWR:`
		1666	`o \|= O_RDWR;`
		1667	`break;`
		1668	`case OWRITE:`
		1669	`o \|= O_WRONLY;`
		1670	`break;`
		1671	`}`
		1672	`if(omode & OTRUNC)`
		1673	`o \|= O_TRUNC;`
		1674	`if((fid->fd = open(npath, o, perm&0777)) < 0){`
		1675	`if(chatty9p)`
		1676	`fprint(2, "create(%s, 0x%x, 0%o) failed\n", npath, o, perm&0777);`
		1677	`*ep = strerror(errno);`
		1678	`free(npath);`
		1679	`return -1;`
		1680	`}`
		1681	`}`
		1682
		1683	`opath = fid->path;`
		1684	`fid->path = npath;`
		1685	`if(fidstat(fid, ep) < 0){`
		1686	`fprint(2, "stat after create on %s failed\n", npath);`
		1687	`remove(npath); /* race */`
		1688	`free(npath);`
		1689	`fid->path = opath;`
		1690	`if(fid->fd >= 0){`
		1691	`close(fid->fd);`
		1692	`fid->fd = -1;`
		1693	`}else{`
		1694	`closedir(fid->dir);`
		1695	`fid->dir = nil;`
		1696	`}`
		1697	`return -1;`
		1698	`}`
		1699	`fid->omode = omode;`
		1700	`free(opath);`
		1701	`return 0;`
		1702	`}`
		1703
		1704	`int`
		1705	`userremove(Fid fid, char *ep)`
		1706	`{`
		1707	`if(remove(fid->path) < 0){`
		1708	`*ep = strerror(errno);`
		1709	`return -1;`
		1710	`}`
		1711	`return 0;`
		1712	`}`
		1713
		1714	`void`
		1715	`usage(void)`
		1716	`{`
		1717	`fprint(2, "usage: u9fs [-Dnz] [-a authmethod] [-m msize] [-u user] [root]\n");`
		1718	`exit(1);`
		1719	`}`
		1720
		1721	`int`
		1722	`main(int argc, char **argv)`
		1723	`{`
		1724	`char *authtype;`
		1725	`int i;`
		1726	`int fd;`
		1727	`int logflag;`
		1728
		1729	`auth = authmethods[0];`
		1730	`logflag = O_WRONLY\|O_APPEND\|O_CREAT;`
		1731	`ARGBEGIN{`
		1732	`case 'D':`
		1733	`chatty9p = 1;`
		1734	`break;`
		1735	`case 'a':`
		1736	`authtype = EARGF(usage());`
		1737	`auth = nil;`
		1738	`for(i=0; i<nelem(authmethods); i++)`
		1739	`if(strcmp(authmethods[i]->name, authtype)==0)`
		1740	`auth = authmethods[i];`
		1741	`if(auth == nil)`
		1742	`sysfatal("unknown auth type '%s'", authtype);`
		1743	`break;`
		1744	`case 'A':`
		1745	`autharg = EARGF(usage());`
		1746	`break;`
		1747	`case 'l':`
		1748	`logfile = EARGF(usage());`
		1749	`break;`
		1750	`case 'm':`
		1751	`msize = strtol(EARGF(usage()), 0, 0);`
		1752	`break;`
		1753	`case 'n':`
		1754	`network = 0;`
		1755	`break;`
		1756	`case 'u':`
		1757	`defaultuser = EARGF(usage());`
		1758	`break;`
		1759	`case 'z':`
		1760	`logflag \|= O_TRUNC;`
		1761	`}ARGEND`
		1762
		1763	`if(argc > 1)`
		1764	`usage();`
		1765
		1766	`fd = open(logfile, logflag, 0666);`
		1767	`if(fd < 0)`
		1768	`sysfatal("cannot open log '%s'", logfile);`
		1769
		1770	`if(dup2(fd, 2) < 0)`
		1771	`sysfatal("cannot dup fd onto stderr");`
		1772	`fprint(2, "u9fs\nkill %d\n", (int)getpid());`
		1773
		1774	`fmtinstall('F', fcallconv);`
		1775	`fmtinstall('D', dirconv);`
		1776	`fmtinstall('M', dirmodeconv);`
		1777
		1778	`rxbuf = emalloc(msize);`
		1779	`txbuf = emalloc(msize);`
		1780	`databuf = emalloc(msize);`
		1781
		1782	`if(auth->init)`
		1783	`auth->init();`
		1784
		1785	`if(network)`
		1786	`getremotehostname(remotehostname, sizeof remotehostname);`
		1787
		1788	`if(gethostname(hostname, sizeof hostname) < 0)`
		1789	`strcpy(hostname, "gnot");`
		1790
		1791	`umask(0);`
		1792
		1793	`if(argc == 1)`
		1794	`if(chroot(argv[0]) < 0)`
		1795	`sysfatal("chroot '%s' failed", argv[0]);`
		1796
		1797	`none = uname2user("none");`
		1798	`if(none == nil)`
		1799	`none = uname2user("nobody");`
		1800
		1801	`serve(0, 1);`
		1802	`return 0;`
		1803	`}`

Subversion Repositories planix.SVN

(root)/os/branches/feature_unix/sys/src/cmd/unix/u9fs/u9fs.c – Rev 71