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#include "mailfront.h"
#include <bglibs/sysdeps.h>
#include <bglibs/systime.h>
#include <errno.h>
#include <unistd.h>
#include <sys/stat.h>
#include <bglibs/iobuf.h>
#include <bglibs/path.h>
#include <bglibs/str.h>
#include <bglibs/wrap.h>
static str destpath;
static str temppath;
static str destname;
static str tempname;
static int tmpfd;
static obuf msgbuf;
static const char* env_prefix;
static str env_tmpdir;
static str env_destdir;
static str env_nosync;
static RESPONSE(createerr, 451, "4.3.0 Error creating queue file");
static RESPONSE(writeerr, 451, "4.3.0 Error writing queue file");
static RESPONSE(configerr, 451, "4.3.0 Missing backend configuration parameter");
void queuedir_init(const char* prefix)
{
env_prefix = prefix;
wrap_str(str_copy2s(&env_tmpdir, prefix, "_TMP"));
wrap_str(str_copy2s(&env_destdir, prefix, "_DEST"));
wrap_str(str_copy2s(&env_nosync, prefix, "_NOSYNC"));
}
const response* queuedir_reset(void)
{
if (tempname.len)
unlink(tempname.s);
if (destname.len)
unlink(destname.s);
tempname.len = destname.len = 0;
return 0;
}
static int make_filename(str* s, const struct timeval* tv, pid_t pid)
{
return str_copyf(s, "d{.}06d{.}d", tv->tv_sec, tv->tv_usec, pid);
}
static const response* make_filenames(void)
{
static str filename;
pid_t pid = getpid();
for (;;) {
struct timeval tv;
struct stat st;
gettimeofday(&tv, 0);
if (!make_filename(&filename, &tv, pid))
return &resp_oom;
if (!str_copyf(&tempname, "S{/}S", &temppath, &filename))
return &resp_oom;
if (lstat(tempname.s, &st) == 0) continue;
if (errno != ENOENT) return &resp_internal;
if (!str_copyf(&destname, "S{/}S", &destpath, &filename))
return &resp_oom;
if (lstat(destname.s, &st) != 0) {
if (errno != ENOENT) return &resp_internal;
return 0;
}
sleep(1);
}
}
const response* queuedir_sender(str* address, str* params)
{
const response* r;
const char* destdir = session_getenv(env_prefix);
const char* tempsubdir = session_getenv(env_tmpdir.s);
const char* destsubdir = session_getenv(env_destdir.s);
if (destdir == 0)
return &resp_configerr;
if (tempsubdir == 0)
tempsubdir = "tmp";
if (destsubdir == 0)
destsubdir = "new";
if (!str_copyf(&destpath, "s{/}s", destdir, destsubdir)
|| !str_copyf(&temppath, "s{/}s", destdir, tempsubdir))
return &resp_oom;
if ((r = make_filenames()) != 0)
return r;
obuf_close(&msgbuf);
if (!obuf_open(&msgbuf, tempname.s, OBUF_CREATE | OBUF_EXCLUSIVE, 0666, 0))
return &resp_createerr;
if (!obuf_putstr(&msgbuf, address) || !obuf_putc(&msgbuf, 0)) {
queuedir_reset();
return &resp_writeerr;
}
return 0;
(void)params;
}
const response* queuedir_recipient(str* address, str* params)
{
if (!obuf_putstr(&msgbuf, address) || !obuf_putc(&msgbuf, 0))
return &resp_writeerr;
return 0;
(void)params;
}
const response* queuedir_data_start(int fd)
{
/* Sender hasn't been sent, so save the message to a temporary file. */
if (destname.len == 0) {
if ((tmpfd = scratchfile()) < 0)
return &resp_writeerr;
}
else {
tmpfd = 0;
if (!obuf_putc(&msgbuf, 0))
return &resp_writeerr;
}
return 0;
(void)fd;
}
const response* queuedir_data_block(const char* bytes, unsigned long len)
{
if (tmpfd > 0) {
if ((unsigned long)write(tmpfd, bytes, len) != len)
return &resp_writeerr;
}
else
if (!obuf_write(&msgbuf, bytes, len))
return &resp_writeerr;
return 0;
}
const response* queuedir_message_end(int fd)
{
int dosync = session_getenv(env_nosync.s) == 0;
/* If using a temporary file, copy it to the output. */
if (tmpfd > 0) {
if (lseek(tmpfd, SEEK_SET, 0) != 0 || !obuf_copyfromfd(tmpfd, &msgbuf)) {
close(tmpfd);
tmpfd = 0;
return &resp_writeerr;
}
close(tmpfd);
tmpfd = 0;
}
/* Flush and close the output. */
if ((dosync && !obuf_sync(&msgbuf))
|| !obuf_close(&msgbuf)) {
queuedir_reset();
return &resp_writeerr;
}
if (link(tempname.s, destname.s) != 0) {
queuedir_reset();
return &resp_writeerr;
}
if (dosync) {
if ((fd = open(destpath.s, O_DIRECTORY | O_RDONLY)) < 0) {
queuedir_reset();
return &resp_internal;
}
if (fsync(fd) != 0) {
queuedir_reset();
return &resp_writeerr;
}
close(fd);
}
unlink(tempname.s);
tempname.len = 0;
destname.len = 0;
return 0;
}
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