Thanks to John Cummings.

1 files changed, 1001 insertions, 0 deletions

diff --git a/src/cmd/upas/common/libsys.c b/src/cmd/upas/common/libsys.c
new file mode 100644
index 00000000..67f36798
--- /dev/null
+++ b/src/cmd/upas/common/libsys.c
@@ -0,0 +1,1001 @@
+#include "common.h"
+#include <auth.h>
+#include <ndb.h>
+
+/*
+ *  number of predefined fd's
+ */
+int nsysfile=3;
+
+static char err[Errlen];
+
+/*
+ *  return the date
+ */
+extern char *
+thedate(void)
+{
+	static char now[64];
+	char *cp;
+
+	strcpy(now, ctime(time(0)));
+	cp = strchr(now, '\n');
+	if(cp)
+		*cp = 0;
+	return now;
+}
+
+/*
+ *  return the user id of the current user
+ */
+extern char *
+getlog(void)
+{
+	return getuser();
+}
+#if 0  /* jpc */
+extern char *
+getlog(void)
+{
+	static char user[64];
+	int fd;
+	int n;
+
+	fd = open("/dev/user", 0);
+	if(fd < 0)
+		return nil;
+	if((n=read(fd, user, sizeof(user)-1)) <= 0)
+		return nil;
+	close(fd);
+	user[n] = 0;
+	return user;
+}
+#endif /* jpc */
+/*
+ *  return the lock name (we use one lock per directory)
+ */
+static String *
+lockname(char *path)
+{
+	String *lp;
+	char *cp;
+
+	/*
+	 *  get the name of the lock file
+	 */
+	lp = s_new();
+	cp = strrchr(path, '/');
+	if(cp)
+		s_nappend(lp, path, cp - path + 1);
+	s_append(lp, "L.mbox");
+
+	return lp;
+}
+
+int
+syscreatelocked(char *path, int mode, int perm)
+{
+	return create(path, mode, DMEXCL|perm);
+}
+
+int
+sysopenlocked(char *path, int mode)
+{
+/*	return open(path, OEXCL|mode);/**/
+	return open(path, mode);		/* until system call is fixed */
+}
+
+int
+sysunlockfile(int fd)
+{
+	return close(fd);
+}
+
+/*
+ *  try opening a lock file.  If it doesn't exist try creating it.
+ */
+static int
+openlockfile(Mlock *l)
+{
+	int fd;
+	Dir *d;
+	Dir nd;
+	char *p;
+
+	fd = open(s_to_c(l->name), OREAD);
+	if(fd >= 0){
+		l->fd = fd;
+		return 0;
+	}
+
+	d = dirstat(s_to_c(l->name));
+	if(d == nil){
+		/* file doesn't exist */
+		/* try creating it */
+		fd = create(s_to_c(l->name), OREAD, DMEXCL|0666);
+		if(fd >= 0){
+			nulldir(&nd);
+			nd.mode = DMEXCL|0666;
+			if(dirfwstat(fd, &nd) < 0){
+				/* if we can't chmod, don't bother */
+				/* live without the lock but log it */
+				syslog(0, "mail", "lock error: %s: %r", s_to_c(l->name));
+				remove(s_to_c(l->name));
+			}
+			l->fd = fd;
+			return 0;
+		}
+
+		/* couldn't create */
+		/* do we have write access to the directory? */
+		p = strrchr(s_to_c(l->name), '/');
+		if(p != 0){
+			*p = 0;
+			fd = access(s_to_c(l->name), 2);
+			*p = '/';
+			if(fd < 0){
+				/* live without the lock but log it */
+				syslog(0, "mail", "lock error: %s: %r", s_to_c(l->name));
+				return 0;
+			}
+		} else {
+			fd = access(".", 2);
+			if(fd < 0){
+				/* live without the lock but log it */
+				syslog(0, "mail", "lock error: %s: %r", s_to_c(l->name));
+				return 0;
+			}
+		}
+	} else
+		free(d);
+
+	return 1; /* try again later */
+}
+
+#define LSECS 5*60
+
+/*
+ *  Set a lock for a particular file.  The lock is a file in the same directory
+ *  and has L. prepended to the name of the last element of the file name.
+ */
+extern Mlock *
+syslock(char *path)
+{
+	Mlock *l;
+	int tries;
+
+	l = mallocz(sizeof(Mlock), 1);
+	if(l == 0)
+		return nil;
+
+	l->name = lockname(path);
+
+	/*
+	 *  wait LSECS seconds for it to unlock
+	 */
+	for(tries = 0; tries < LSECS*2; tries++){
+		switch(openlockfile(l)){
+		case 0:
+			return l;
+		case 1:
+			sleep(500);
+			break;
+		default:
+			goto noway;
+		}
+	}
+
+noway:
+	s_free(l->name);
+	free(l);
+	return nil;
+}
+
+/*
+ *  like lock except don't wait
+ */
+extern Mlock *
+trylock(char *path)
+{
+	Mlock *l;
+	char buf[1];
+	int fd;
+
+	l = malloc(sizeof(Mlock));
+	if(l == 0)
+		return 0;
+
+	l->name = lockname(path);
+	if(openlockfile(l) != 0){
+		s_free(l->name);
+		free(l);
+		return 0;
+	}
+	
+	/* fork process to keep lock alive */
+	switch(l->pid = rfork(RFPROC)){
+	default:
+		break;
+	case 0:
+		fd = l->fd;
+		for(;;){
+			sleep(1000*60);
+			if(pread(fd, buf, 1, 0) < 0)
+				break;
+		}
+		_exits(0);
+	}
+	return l;
+}
+
+extern void
+syslockrefresh(Mlock *l)
+{
+	char buf[1];
+
+	pread(l->fd, buf, 1, 0);
+}
+
+extern void
+sysunlock(Mlock *l)
+{
+	if(l == 0)
+		return;
+	if(l->name){
+		s_free(l->name);
+	}
+	if(l->fd >= 0)
+		close(l->fd);
+	if(l->pid > 0)
+		postnote(PNPROC, l->pid, "time to die");
+	free(l);
+}
+
+/*
+ *  Open a file.  The modes are:
+ *
+ *	l	- locked
+ *	a	- set append permissions
+ *	r	- readable
+ *	w	- writable
+ *	A	- append only (doesn't exist in Bio)
+ */
+extern Biobuf *
+sysopen(char *path, char *mode, ulong perm)
+{
+	int sysperm;
+	int sysmode;
+	int fd;
+	int docreate;
+	int append;
+	int truncate;
+	Dir *d, nd;
+	Biobuf *bp;
+
+	/*
+	 *  decode the request
+	 */
+	sysperm = 0;
+	sysmode = -1;
+	docreate = 0;
+	append = 0;
+	truncate = 0;
+ 	for(; mode && *mode; mode++)
+		switch(*mode){
+		case 'A':
+			sysmode = OWRITE;
+			append = 1;
+			break;
+		case 'c':
+			docreate = 1;
+			break;
+		case 'l':
+			sysperm |= DMEXCL;
+			break;
+		case 'a':
+			sysperm |= DMAPPEND;
+			break;
+		case 'w':
+			if(sysmode == -1)
+				sysmode = OWRITE;
+			else
+				sysmode = ORDWR;
+			break;
+		case 'r':
+			if(sysmode == -1)
+				sysmode = OREAD;
+			else
+				sysmode = ORDWR;
+			break;
+		case 't':
+			truncate = 1;
+			break;
+		default:
+			break;
+		}
+	switch(sysmode){
+	case OREAD:
+	case OWRITE:
+	case ORDWR:
+		break;
+	default:
+		if(sysperm&DMAPPEND)
+			sysmode = OWRITE;
+		else
+			sysmode = OREAD;
+		break;
+	}
+
+	/*
+	 *  create file if we need to
+	 */
+	if(truncate)
+		sysmode |= OTRUNC;
+	fd = open(path, sysmode);
+	if(fd < 0){
+		d = dirstat(path);
+		if(d == nil){
+			if(docreate == 0)
+				return 0;
+
+			fd = create(path, sysmode, sysperm|perm);
+			if(fd < 0)
+				return 0;
+			nulldir(&nd);
+			nd.mode = sysperm|perm;
+			dirfwstat(fd, &nd);
+		} else {
+			free(d);
+			return 0;
+		}
+	}
+
+	bp = (Biobuf*)malloc(sizeof(Biobuf));
+	if(bp == 0){
+		close(fd);
+		return 0;
+	}
+	memset(bp, 0, sizeof(Biobuf));
+	Binit(bp, fd, sysmode&~OTRUNC);
+
+	if(append)
+		Bseek(bp, 0, 2);
+	return bp;
+}
+
+/*
+ *  close the file, etc.
+ */
+int
+sysclose(Biobuf *bp)
+{
+	int rv;
+
+	rv = Bterm(bp);
+	close(Bfildes(bp));
+	free(bp);
+	return rv;
+}
+
+/*
+ *  create a file
+ */
+int
+syscreate(char *file, int mode, ulong perm)
+{
+	return create(file, mode, perm);
+}
+
+/*
+ *  make a directory
+ */
+int
+sysmkdir(char *file, ulong perm)
+{
+	int fd;
+
+	if((fd = create(file, OREAD, DMDIR|perm)) < 0)
+		return -1;
+	close(fd);
+	return 0;
+}
+
+/*
+ *  change the group of a file
+ */
+int
+syschgrp(char *file, char *group)
+{
+	Dir nd;
+
+	if(group == 0)
+		return -1;
+	nulldir(&nd);
+	nd.gid = group;
+	return dirwstat(file, &nd);
+}
+
+extern int
+sysdirreadall(int fd, Dir **d)
+{
+	return dirreadall(fd, d);
+}
+
+/*
+ *  read in the system name
+ */
+extern char *
+sysname_read(void)
+{
+	static char name[128];
+	char *cp;
+
+	cp = getenv("site");
+	if(cp == 0 || *cp == 0)
+		cp = alt_sysname_read();
+	if(cp == 0 || *cp == 0)
+		cp = "kremvax";
+	strecpy(name, name+sizeof name, cp);
+	return name;
+}
+extern char *
+alt_sysname_read(void)
+{
+	static char name[128];
+	int n, fd;
+
+	fd = open("/dev/sysname", OREAD);
+	if(fd < 0)
+		return 0;
+	n = read(fd, name, sizeof(name)-1);
+	close(fd);
+	if(n <= 0)
+		return 0;
+	name[n] = 0;
+	return name;
+}
+
+/*
+ *  get all names
+ */
+extern char**
+sysnames_read(void)
+{
+	static char **namev;
+	Ndbtuple *t, *nt;
+	Ndb* db;
+	Ndbs s;
+	int n;
+	char *cp;
+
+	if(namev)
+		return namev;
+
+	/* free(csgetvalue(0, "sys", alt_sysname_read(), "dom", &t));  jpc */
+	db = ndbopen(unsharp("#9/ndb/local"));
+	free(ndbgetvalue(db, &s, "sys", sysname(),"dom", &t));
+	/* t = nil; /* jpc */
+	/* fprint(2,"csgetvalue called: fixme"); /* jpc */
+
+	n = 0;
+	for(nt = t; nt; nt = nt->entry)
+		if(strcmp(nt->attr, "dom") == 0)
+			n++;
+
+	namev = (char**)malloc(sizeof(char *)*(n+3));
+
+	if(namev){
+		n = 0;
+		namev[n++] = strdup(sysname_read());
+		cp = alt_sysname_read();
+		if(cp)
+			namev[n++] = strdup(cp);
+		for(nt = t; nt; nt = nt->entry)
+			if(strcmp(nt->attr, "dom") == 0)
+				namev[n++] = strdup(nt->val);
+		namev[n] = 0;
+	}
+	if(t)
+		ndbfree(t);
+
+	return namev;
+}
+
+/*
+ *  read in the domain name
+ */
+extern char *
+domainname_read(void)
+{
+	char **namev;
+
+	for(namev = sysnames_read(); *namev; namev++)
+		if(strchr(*namev, '.'))
+			return *namev;
+	return 0;
+}
+
+/*
+ *  return true if the last error message meant file
+ *  did not exist.
+ */
+extern int
+e_nonexistent(void)
+{
+	rerrstr(err, sizeof(err));
+	return strcmp(err, "file does not exist") == 0;
+}
+
+/*
+ *  return true if the last error message meant file
+ *  was locked.
+ */
+extern int
+e_locked(void)
+{
+	rerrstr(err, sizeof(err));
+	return strcmp(err, "open/create -- file is locked") == 0;
+}
+
+/*
+ *  return the length of a file
+ */
+extern long
+sysfilelen(Biobuf *fp)
+{
+	Dir *d;
+	long rv;
+
+	d = dirfstat(Bfildes(fp));
+	if(d == nil)
+		return -1;
+	rv = d->length;
+	free(d);
+	return rv;
+}
+
+/*
+ *  remove a file
+ */
+extern int
+sysremove(char *path)
+{
+	return remove(path);
+}
+
+/*
+ *  rename a file, fails unless both are in the same directory
+ */
+extern int
+sysrename(char *old, char *new)
+{
+	Dir d;
+	char *obase;
+	char *nbase;
+
+	obase = strrchr(old, '/');
+	nbase = strrchr(new, '/');
+	if(obase){
+		if(nbase == 0)
+			return -1;
+		if(strncmp(old, new, obase-old) != 0)
+			return -1;
+		nbase++;
+	} else {
+		if(nbase)
+			return -1;
+		nbase = new;
+	}
+	nulldir(&d);
+	d.name = nbase;
+	return dirwstat(old, &d);
+}
+
+/*
+ *  see if a file exists
+ */
+extern int
+sysexist(char *file)
+{
+	Dir	*d;
+
+	d = dirstat(file);
+	if(d == nil)
+		return 0;
+	free(d);
+	return 1;
+}
+
+/*
+ *  return nonzero if file is a directory
+ */
+extern int
+sysisdir(char *file)
+{
+	Dir	*d;
+	int	rv;
+
+	d = dirstat(file);
+	if(d == nil)
+		return 0;
+	rv = d->mode & DMDIR;
+	free(d);
+	return rv;
+}
+
+/*
+ * kill a process or process group
+ */
+
+static int
+stomp(int pid, char *file)
+{
+	char name[64];
+	int fd;
+
+	snprint(name, sizeof(name), "/proc/%d/%s", pid, file);
+	fd = open(name, 1);
+	if(fd < 0)
+		return -1;
+	if(write(fd, "die: yankee pig dog\n", sizeof("die: yankee pig dog\n") - 1) <= 0){
+		close(fd);
+		return -1;
+	}
+	close(fd);
+	return 0;
+	
+}
+
+/*
+ *  kill a process
+ */
+extern int
+syskill(int pid)
+{
+	return stomp(pid, "note");
+	
+}
+
+/*
+ *  kill a process group
+ */
+extern int
+syskillpg(int pid)
+{
+	return stomp(pid, "notepg");
+}
+
+extern int
+sysdetach(void)
+{
+	if(rfork(RFENVG|RFNAMEG|RFNOTEG) < 0) {
+		werrstr("rfork failed");
+		return -1;
+	}
+	return 0;
+}
+
+/*
+ *  catch a write on a closed pipe
+ */
+static int *closedflag;
+static int
+catchpipe(void *a, char *msg)
+{
+	static char *foo = "sys: write on closed pipe";
+
+	USED(a);
+	if(strncmp(msg, foo, strlen(foo)) == 0){
+		if(closedflag)
+			*closedflag = 1;
+		return 1;
+	}
+	return 0;
+}
+void
+pipesig(int *flagp)
+{
+	closedflag = flagp;
+	atnotify(catchpipe, 1);
+}
+void
+pipesigoff(void)
+{
+	atnotify(catchpipe, 0);
+}
+
+void
+exit9(int i)
+{
+	char buf[32];
+
+	if(i == 0)
+		exits(0);
+	snprint(buf, sizeof(buf), "%d", i);
+	exits(buf);
+}
+
+static int
+islikeatty(int fd)
+{
+	Dir *d;
+	int rv;
+
+	d = dirfstat(fd);
+	if(d == nil)
+		return 0;
+	rv = strcmp(d->name, "cons") == 0;
+	free(d);
+	return rv;
+}
+
+#if 0
+/* jpc */
+static int
+islikeatty(int fd)
+{
+	char buf[64];
+
+	if(fd2path(fd, buf, sizeof buf) != 0)
+		return 0;
+
+	/* might be /mnt/term/dev/cons */
+	return strlen(buf) >= 9 && strcmp(buf+strlen(buf)-9, "/dev/cons") == 0;
+}
+#endif
+
+extern int
+holdon(void)
+{
+	int fd;
+
+	if(!islikeatty(0))
+		return -1;
+
+	fd = open("/dev/consctl", OWRITE);
+	write(fd, "holdon", 6);
+
+	return fd;
+}
+
+extern int
+sysopentty(void)
+{
+	return open("/dev/cons", ORDWR);
+}
+
+extern void
+holdoff(int fd)
+{
+	write(fd, "holdoff", 7);
+	close(fd);
+}
+
+extern int
+sysfiles(void)
+{
+	return 128;
+}
+
+/*
+ *  expand a path relative to the user's mailbox directory
+ *
+ *  if the path starts with / or ./, don't change it
+ *
+ */
+extern String *
+mboxpath(char *path, char *user, String *to, int dot)
+{
+	if (dot || *path=='/' || strncmp(path, "./", 2) == 0
+			      || strncmp(path, "../", 3) == 0) {
+		to = s_append(to, path);
+	} else {
+		to = s_append(to, unsharp(MAILROOT));
+		to = s_append(to, "/box/");
+		to = s_append(to, user);
+		to = s_append(to, "/");
+		to = s_append(to, path);
+	}
+	return to;
+}
+
+extern String *
+mboxname(char *user, String *to)
+{
+	return mboxpath("mbox", user, to, 0);
+}
+
+extern String *
+deadletter(String *to)		/* pass in sender??? */
+{
+	char *cp;
+
+	cp = getlog();
+	if(cp == 0)
+		return 0;
+	return mboxpath("dead.letter", cp, to, 0);
+}
+
+char *
+homedir(char *user)
+{
+	USED(user);
+	return getenv("home");
+}
+
+String *
+readlock(String *file)
+{
+	char *cp;
+
+	cp = getlog();
+	if(cp == 0)
+		return 0;
+	return mboxpath("reading", cp, file, 0);
+}
+
+String *
+username(String *from)
+{
+	int n;
+	Biobuf *bp;
+	char *p, *q;
+	String *s;
+
+	bp = Bopen("/adm/keys.who", OREAD);
+	if(bp == 0)
+		bp = Bopen("/adm/netkeys.who", OREAD);
+	if(bp == 0)
+		return 0;
+
+	s = 0;
+	n = strlen(s_to_c(from));
+	for(;;) {
+		p = Brdline(bp, '\n');
+		if(p == 0)
+			break;
+		p[Blinelen(bp)-1] = 0;
+		if(strncmp(p, s_to_c(from), n))
+			continue;
+		p += n;
+		if(*p != ' ' && *p != '\t')	/* must be full match */
+			continue;
+		while(*p && (*p == ' ' || *p == '\t'))
+				p++;
+		if(*p == 0)
+			continue;
+		for(q = p; *q; q++)
+			if(('0' <= *q && *q <= '9') || *q == '<')
+				break;
+		while(q > p && q[-1] != ' ' && q[-1] != '\t')
+			q--;
+		while(q > p && (q[-1] == ' ' || q[-1] == '\t'))
+			q--;
+		*q = 0;
+		s = s_new();
+		s_append(s, "\"");
+		s_append(s, p);
+		s_append(s, "\"");
+		break;
+	}
+	Bterm(bp);
+	return s;
+}
+
+char *
+remoteaddr(int fd, char *dir)
+{
+	char buf[128], *p;
+	int n;
+
+	if(dir == 0){
+		fprint(2,"remoteaddr: called fd2path: fixme\n"); /* jpc
+		if(fd2path(fd, buf, sizeof(buf)) != 0)
+			return ""; */
+
+		/* parse something of the form /net/tcp/nnnn/data */
+		p = strrchr(buf, '/');
+		if(p == 0)
+			return "";
+		strncpy(p+1, "remote", sizeof(buf)-(p-buf)-2);
+	} else
+		snprint(buf, sizeof buf, "%s/remote", dir);
+	buf[sizeof(buf)-1] = 0;
+
+	fd = open(buf, OREAD);
+	if(fd < 0)
+		return "";
+	n = read(fd, buf, sizeof(buf)-1);
+	close(fd);
+	if(n > 0){
+		buf[n] = 0;
+		p = strchr(buf, '!');
+		if(p)
+			*p = 0;
+		return strdup(buf);
+	}
+	return "";
+}
+
+//  create a file and 
+//	1) ensure the modes we asked for
+//	2) make gid == uid
+static int
+docreate(char *file, int perm)
+{
+	int fd;
+	Dir ndir;
+	Dir *d;
+
+	//  create the mbox
+	fd = create(file, OREAD, perm);
+	if(fd < 0){
+		fprint(2, "couldn't create %s\n", file);
+		return -1;
+	}
+	d = dirfstat(fd);
+	if(d == nil){
+		fprint(2, "couldn't stat %s\n", file);
+		return -1;
+	}
+	nulldir(&ndir);
+	ndir.mode = perm;
+	ndir.gid = d->uid;
+	if(dirfwstat(fd, &ndir) < 0)
+		fprint(2, "couldn't chmod %s: %r\n", file);
+	close(fd);
+	return 0;
+}
+
+//  create a mailbox
+int
+creatembox(char *user, char *folder)
+{
+	char *p;
+	String *mailfile;
+	char buf[512];
+	Mlock *ml;
+
+	mailfile = s_new();
+	if(folder == 0)
+		mboxname(user, mailfile);
+	else {
+		snprint(buf, sizeof(buf), "%s/mbox", folder);
+		mboxpath(buf, user, mailfile, 0);
+	}
+
+	// don't destroy existing mailbox
+	if(access(s_to_c(mailfile), 0) == 0){
+		fprint(2, "mailbox already exists\n");
+		return -1;
+	}
+	fprint(2, "creating new mbox: %s\n", s_to_c(mailfile));
+
+	//  make sure preceding levels exist
+	for(p = s_to_c(mailfile); p; p++) {
+		if(*p == '/')	/* skip leading or consecutive slashes */
+			continue;
+		p = strchr(p, '/');
+		if(p == 0)
+			break;
+		*p = 0;
+		if(access(s_to_c(mailfile), 0) != 0){
+			if(docreate(s_to_c(mailfile), DMDIR|0711) < 0)
+				return -1;
+		}
+		*p = '/';
+	}
+
+	//  create the mbox
+	if(docreate(s_to_c(mailfile), 0622|DMAPPEND|DMEXCL) < 0)
+		return -1;
+
+	/*
+	 *  create the lock file if it doesn't exist
+	 */
+	ml = trylock(s_to_c(mailfile));
+	if(ml != nil)
+		sysunlock(ml);
+
+	return 0;
+}