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/*
* Copyright (c) 2014 Sunil Nimmagadda <sunil@nimmagadda.net>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/types.h>
#include <sys/tree.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <fcntl.h>
#include <dirent.h>
#include <stdio.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include "pop3d.h"
static int init(struct mdrop *, size_t *, size_t *);
static int retr(struct mdrop *, unsigned int, size_t *, size_t *);
static int update(struct mdrop *);
static int new_to_cur(struct mdrop *);
static int msgcmp(struct msg *, struct msg *);
RB_PROTOTYPE(msgtree, msg, e.t_entry, msgcmp);
struct m_backend m_backend_maildir = {
init,
retr,
update
};
/*
* No resource management on error path as the process is
* killed if an error occurs.
*/
static int
init(struct mdrop *m, size_t *nmsgs, size_t *sz)
{
SHA1_CTX ctx;
struct stat sb;
char buf[MAXBSIZE];
DIR *dirp;
struct dirent *dp;
struct msg *msg;
u_char *C;
size_t i;
ssize_t len;
int cur_fd, msg_fd;
*nmsgs = 0;
*sz = 0;
if (new_to_cur(m) == -1) {
logit(LOG_WARNING, "maildir: move msgs from new to cur failed");
return (-1);
}
if ((cur_fd = openat(m->fd, "cur", O_RDONLY)) == -1) {
logit(LOG_CRIT, "maildir: unable to open \"cur\" dir");
return (-1);
}
if ((dirp = fdopendir(cur_fd)) == NULL)
return (-1);
while ((dp = readdir(dirp))) {
if (dp->d_type != DT_REG)
continue;
if (strcmp(dp->d_name, ".") == 0 ||
strcmp(dp->d_name, "..") == 0)
continue;
msg = xcalloc(1, sizeof(*msg), "init");
if ((msg->u.fname = strdup(dp->d_name)) == NULL)
fatalx("init: strdup");
if (fstatat(cur_fd, dp->d_name, &sb, 0) == -1) {
logit(LOG_CRIT, "%s fstatat failed", dp->d_name);
return (-1);
}
msg->sz = sb.st_size;
if ((msg_fd = openat(cur_fd, dp->d_name, O_RDONLY)) == -1) {
logit(LOG_CRIT, "%s openat failed", dp->d_name);
return (-1);
}
SHA1Init(&ctx);
while (( len = read(msg_fd, buf, sizeof(buf))) > 0) {
SHA1Update(&ctx, (u_int8_t *)buf, len);
for (C = buf; len--; ++C)
if (*C == '\n')
msg->nlines += 1;
}
SHA1End(&ctx, msg->hash);
close(msg_fd);
RB_INSERT(msgtree, &m->e.t_msgs, msg);
m->nmsgs += 1;
}
/* allocate space for nmsgs of struct msg pointers */
m->msgs_index = xcalloc(m->nmsgs, sizeof(msg), "init");
*nmsgs = m->nmsgs;
i = 0;
*sz = 0;
RB_FOREACH(msg, msgtree, &m->e.t_msgs) {
m->msgs_index[i++] = msg;
/* calculate maildir size by counting newline as 2 (CRLF) */
*sz += msg->sz + msg->nlines;
}
closedir(dirp);
close(cur_fd);
return (0);
}
static int
new_to_cur(struct mdrop *m)
{
DIR *dirp;
struct dirent *dp;
int cur_fd, new_fd;
if ((cur_fd = openat(m->fd, "cur", O_RDONLY)) == -1) {
logit(LOG_CRIT, "maildir: unable to open \"cur\" dir");
return (-1);
}
if ((new_fd = openat(m->fd, "new", O_RDONLY)) == -1) {
logit(LOG_CRIT, "maildir: unable to open \"new\" dir");
return (-1);
}
if ((dirp = fdopendir(new_fd)) == NULL)
return (-1);
while ((dp = readdir(dirp))) {
if (dp->d_type != DT_REG)
continue;
if (strcmp(dp->d_name, ".") == 0 ||
strcmp(dp->d_name, "..") == 0)
continue;
if(renameat(new_fd, dp->d_name, cur_fd, dp->d_name) == -1) {
logit(LOG_CRIT, "maildir: renameat failed");
return (-1);
}
}
closedir(dirp);
close(cur_fd);
close(new_fd);
return (0);
}
static int
retr(struct mdrop *m, unsigned int idx, size_t *nlines, size_t *offset)
{
char buf[MAXPATHLEN];
int fd, r;
*offset = 0;
*nlines = m->msgs_index[idx]->nlines;
r = snprintf(buf, sizeof(buf), "cur/%s", m->msgs_index[idx]->u.fname);
if ((u_int)r >= sizeof(buf)) {
logit(LOG_WARNING, "path too long");
return (-1);
}
fd = openat(m->fd, buf, O_RDONLY);
return (fd);
}
static int
update(struct mdrop *m)
{
char buf[MAXPATHLEN];
size_t i, j = 0;
int r;
for (i = 0; i < m->nmsgs; i++)
if (m->msgs_index[i]->flags & F_DELE)
j += 1;
if (j == 0) /* nothing to update */
return (0);
for (i = 0; i < m->nmsgs; i++) {
if (!(m->msgs_index[i]->flags & F_DELE))
continue;
r = snprintf(buf, sizeof(buf), "cur/%s",
m->msgs_index[i]->u.fname);
if ((u_int)r >= sizeof(buf)) {
logit(LOG_WARNING, "path too long");
return (1);
}
if (unlinkat(m->fd, buf, 0) == -1) {
logit(LOG_CRIT, "%s unlink failed", buf);
return (1);
}
}
return (0);
}
static int
msgcmp(struct msg *m1, struct msg *m2)
{
return strcmp(m1->u.fname, m2->u.fname);
}
RB_GENERATE(msgtree, msg, e.t_entry, msgcmp);
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