ref: 7ed22aaeec7a09f2215d08003e2e5c824f903d5d
dir: /sys/src/cmd/ip/imap4d/folder.c/
#include <u.h>
#include <libc.h>
#include <bio.h>
#include <auth.h>
#include "imap4d.h"
static int copyData(int ffd, int tfd, MbLock *ml);
static MbLock mLock =
{
.fd = -1
};
static char curDir[MboxNameLen];
void
resetCurDir(void)
{
curDir[0] = '\0';
}
int
myChdir(char *dir)
{
if(strcmp(dir, curDir) == 0)
return 0;
if(dir[0] != '/' || strlen(dir) > MboxNameLen)
return -1;
strcpy(curDir, dir);
if(chdir(dir) < 0){
werrstr("mychdir failed: %r");
return -1;
}
return 0;
}
int
cdCreate(char *dir, char *file, int mode, ulong perm)
{
if(myChdir(dir) < 0)
return -1;
return create(file, mode, perm);
}
Dir*
cdDirstat(char *dir, char *file)
{
if(myChdir(dir) < 0)
return nil;
return dirstat(file);
}
int
cdExists(char *dir, char *file)
{
Dir *d;
d = cdDirstat(dir, file);
if(d == nil)
return 0;
free(d);
return 1;
}
int
cdDirwstat(char *dir, char *file, Dir *d)
{
if(myChdir(dir) < 0)
return -1;
return dirwstat(file, d);
}
int
cdOpen(char *dir, char *file, int mode)
{
if(myChdir(dir) < 0)
return -1;
return open(file, mode);
}
int
cdRemove(char *dir, char *file)
{
if(myChdir(dir) < 0)
return -1;
return remove(file);
}
/*
* open the one true mail lock file
*/
MbLock*
mbLock(void)
{
int i;
if(mLock.fd >= 0)
bye("mail lock deadlock");
for(i = 0; i < 5; i++){
mLock.fd = openLocked(mboxDir, "L.mbox", OREAD);
if(mLock.fd >= 0)
return &mLock;
sleep(1000);
}
return nil;
}
void
mbUnlock(MbLock *ml)
{
if(ml != &mLock)
bye("bad mail unlock");
if(ml->fd < 0)
bye("mail unlock when not locked");
close(ml->fd);
ml->fd = -1;
}
void
mbLockRefresh(MbLock *ml)
{
char buf[1];
seek(ml->fd, 0, 0);
read(ml->fd, buf, 1);
}
int
mbLocked(void)
{
return mLock.fd >= 0;
}
char*
impName(char *name)
{
char *s;
int n;
if(cistrcmp(name, "inbox") == 0)
if(access("msgs", AEXIST) == 0)
name = "msgs";
else
name = "mbox";
n = strlen(name) + STRLEN(".imp") + 1;
s = binalloc(&parseBin, n, 0);
if(s == nil)
return nil;
snprint(s, n, "%s.imp", name);
return s;
}
/*
* massage the mailbox name into something valid
* eliminates all .', and ..',s, redundatant and trailing /'s.
*/
char *
mboxName(char *s)
{
char *ss;
ss = mutf7str(s);
if(ss == nil)
return nil;
cleanname(ss);
return ss;
}
char *
strmutf7(char *s)
{
char *m;
int n;
n = strlen(s) * MUtf7Max + 1;
m = binalloc(&parseBin, n, 0);
if(m == nil)
return nil;
if(encmutf7(m, n, s) < 0)
return nil;
return m;
}
char *
mutf7str(char *s)
{
char *m;
int n;
/*
* n = strlen(s) * UTFmax / (2.67) + 1
* UTFMax / 2.67 == 3 / (8/3) == 9 / 8
*/
n = strlen(s);
n = (n * 9 + 7) / 8 + 1;
m = binalloc(&parseBin, n, 0);
if(m == nil)
return nil;
if(decmutf7(m, n, s) < 0)
return nil;
return m;
}
void
splitr(char *s, int c, char **left, char **right)
{
char *d;
int n;
n = strlen(s);
d = binalloc(&parseBin, n + 1, 0);
if(d == nil)
parseErr("out of memory");
strcpy(d, s);
s = strrchr(d, c);
if(s != nil){
*left = d;
*s++ = '\0';
*right = s;
}else{
*right = d;
*left = d + n;
}
}
/*
* create the mailbox and all intermediate components
* a trailing / implies the new mailbox is a directory;
* otherwise, it's a file.
*
* return with the file open for write, or directory open for read.
*/
int
createBox(char *mbox, int dir)
{
char *m;
int fd;
fd = -1;
for(m = mbox; *m; m++){
if(*m == '/'){
*m = '\0';
if(access(mbox, AEXIST) < 0){
if(fd >= 0)
close(fd);
fd = cdCreate(mboxDir, mbox, OREAD, DMDIR|0775);
if(fd < 0)
return -1;
}
*m = '/';
}
}
if(dir)
fd = cdCreate(mboxDir, mbox, OREAD, DMDIR|0775);
else
fd = cdCreate(mboxDir, mbox, OWRITE, 0664);
return fd;
}
/*
* move one mail folder to another
* destination mailbox doesn't exist.
* the source folder may be a directory or a mailbox,
* and may be in the same directory as the destination,
* or a completely different directory.
*/
int
moveBox(char *from, char *to)
{
Dir *d;
char *fd, *fe, *td, *te, *fimp;
splitr(from, '/', &fd, &fe);
splitr(to, '/', &td, &te);
/*
* in the same directory: try rename
*/
d = cdDirstat(mboxDir, from);
if(d == nil)
return 0;
if(strcmp(fd, td) == 0){
nulldir(d);
d->name = te;
if(cdDirwstat(mboxDir, from, d) >= 0){
fimp = impName(from);
d->name = impName(te);
cdDirwstat(mboxDir, fimp, d);
free(d);
return 1;
}
}
/*
* directory copy is too hard for now
*/
if(d->mode & DMDIR)
return 0;
free(d);
return copyBox(from, to, 1);
}
/*
* copy the contents of one mailbox to another
* either truncates or removes the source box if it succeeds.
*/
int
copyBox(char *from, char *to, int doremove)
{
MbLock *ml;
char *fimp, *timp;
int ffd, tfd, ok;
if(cistrcmp(from, "inbox") == 0)
if(access("msgs", AEXIST) == 0)
from = "msgs";
else
from = "mbox";
ml = mbLock();
if(ml == nil)
return 0;
ffd = openLocked(mboxDir, from, OREAD);
if(ffd < 0){
mbUnlock(ml);
return 0;
}
tfd = createBox(to, 0);
if(tfd < 0){
mbUnlock(ml);
close(ffd);
return 0;
}
ok = copyData(ffd, tfd, ml);
close(ffd);
close(tfd);
if(!ok){
mbUnlock(ml);
return 0;
}
fimp = impName(from);
timp = impName(to);
if(fimp != nil && timp != nil){
ffd = cdOpen(mboxDir, fimp, OREAD);
if(ffd >= 0){
tfd = cdCreate(mboxDir, timp, OWRITE, 0664);
if(tfd >= 0){
copyData(ffd, tfd, ml);
close(tfd);
}
close(ffd);
}
}
cdRemove(mboxDir, fimp);
if(doremove)
cdRemove(mboxDir, from);
else
close(cdOpen(mboxDir, from, OWRITE|OTRUNC));
mbUnlock(ml);
return 1;
}
/*
* copies while holding the mail lock,
* then tries to copy permissions and group ownership
*/
static int
copyData(int ffd, int tfd, MbLock *ml)
{
Dir *fd, td;
char buf[BufSize];
int n;
for(;;){
n = read(ffd, buf, BufSize);
if(n <= 0){
if(n < 0)
return 0;
break;
}
if(write(tfd, buf, n) != n)
return 0;
mbLockRefresh(ml);
}
fd = dirfstat(ffd);
if(fd != nil){
nulldir(&td);
td.mode = fd->mode;
if(dirfwstat(tfd, &td) >= 0){
nulldir(&td);
td.gid = fd->gid;
dirfwstat(tfd, &td);
}
}
return 1;
}