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|
/* $OpenBSD: mproc.c,v 1.4 2013/07/19 15:18:42 eric Exp $ */
/*
* Copyright (c) 2012 Eric Faurot <eric@faurot.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/types.h>
#include <sys/socket.h>
#include <sys/tree.h>
#include <sys/queue.h>
#include <sys/uio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <err.h>
#include <errno.h>
#include <event.h>
#include <imsg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "smtpd.h"
#include "log.h"
static void mproc_event_add(struct mproc *);
static void mproc_dispatch(int, short, void *);
static ssize_t msgbuf_write2(struct msgbuf *);
int
mproc_fork(struct mproc *p, const char *path, const char *arg)
{
int sp[2];
if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, sp) < 0)
return (-1);
session_socket_blockmode(sp[0], BM_NONBLOCK);
session_socket_blockmode(sp[1], BM_NONBLOCK);
if ((p->pid = fork()) == -1)
goto err;
if (p->pid == 0) {
/* child process */
dup2(sp[0], STDIN_FILENO);
if (closefrom(STDERR_FILENO + 1) < 0)
exit(1);
execl(path, arg, NULL);
err(1, "execl");
}
/* parent process */
close(sp[0]);
mproc_init(p, sp[1]);
return (0);
err:
log_warn("warn: Failed to start process %s, instance of %s", arg, path);
close(sp[0]);
close(sp[1]);
return (-1);
}
void
mproc_init(struct mproc *p, int fd)
{
imsg_init(&p->imsgbuf, fd);
}
void
mproc_clear(struct mproc *p)
{
event_del(&p->ev);
close(p->imsgbuf.fd);
imsg_clear(&p->imsgbuf);
}
void
mproc_enable(struct mproc *p)
{
if (p->enable == 0) {
log_trace(TRACE_MPROC, "mproc: %s -> %s: enabled",
proc_name(smtpd_process),
proc_name(p->proc));
p->enable = 1;
}
mproc_event_add(p);
}
void
mproc_disable(struct mproc *p)
{
if (p->enable == 1) {
log_trace(TRACE_MPROC, "mproc: %s -> %s: disabled",
proc_name(smtpd_process),
proc_name(p->proc));
p->enable = 0;
}
mproc_event_add(p);
}
static void
mproc_event_add(struct mproc *p)
{
short events;
if (p->enable)
events = EV_READ;
else
events = 0;
if (p->imsgbuf.w.queued)
events |= EV_WRITE;
if (p->events)
event_del(&p->ev);
p->events = events;
if (events) {
event_set(&p->ev, p->imsgbuf.fd, events, mproc_dispatch, p);
event_add(&p->ev, NULL);
}
}
static void
mproc_dispatch(int fd, short event, void *arg)
{
struct mproc *p = arg;
struct imsg imsg;
ssize_t n;
p->events = 0;
if (event & EV_READ) {
if ((n = imsg_read(&p->imsgbuf)) == -1) {
log_warn("warn: %s -> %s: imsg_read",
proc_name(smtpd_process), p->name);
fatal("exiting");
}
if (n == 0) {
/* this pipe is dead, so remove the event handler */
if (smtpd_process != PROC_CONTROL ||
p->proc != PROC_CLIENT)
log_warnx("warn: %s -> %s: pipe closed",
proc_name(smtpd_process), p->name);
p->handler(p, NULL);
return;
}
p->bytes_in += n;
}
if (event & EV_WRITE) {
n = msgbuf_write2(&p->imsgbuf.w);
if (n == -1)
fatal("msgbuf_write");
p->bytes_out += n;
p->bytes_queued -= n;
}
for (;;) {
if ((n = imsg_get(&p->imsgbuf, &imsg)) == -1) {
log_warn("fatal: %s: error in imsg_get for %s",
proc_name(smtpd_process), p->name);
fatalx(NULL);
}
if (n == 0)
break;
p->msg_in += 1;
p->handler(p, &imsg);
imsg_free(&imsg);
}
#if 0
if (smtpd_process == PROC_QUEUE)
queue_flow_control();
#endif
mproc_event_add(p);
}
/* XXX msgbuf_write() should return n ... */
static ssize_t
msgbuf_write2(struct msgbuf *msgbuf)
{
struct iovec iov[IOV_MAX];
struct ibuf *buf;
unsigned int i = 0;
ssize_t n;
struct msghdr msg;
struct cmsghdr *cmsg;
union {
struct cmsghdr hdr;
char buf[CMSG_SPACE(sizeof(int))];
} cmsgbuf;
bzero(&iov, sizeof(iov));
bzero(&msg, sizeof(msg));
TAILQ_FOREACH(buf, &msgbuf->bufs, entry) {
if (i >= IOV_MAX)
break;
iov[i].iov_base = buf->buf + buf->rpos;
iov[i].iov_len = buf->wpos - buf->rpos;
i++;
if (buf->fd != -1)
break;
}
msg.msg_iov = iov;
msg.msg_iovlen = i;
if (buf != NULL && buf->fd != -1) {
msg.msg_control = (caddr_t)&cmsgbuf.buf;
msg.msg_controllen = sizeof(cmsgbuf.buf);
cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
*(int *)CMSG_DATA(cmsg) = buf->fd;
}
again:
if ((n = sendmsg(msgbuf->fd, &msg, 0)) == -1) {
if (errno == EAGAIN || errno == EINTR)
goto again;
if (errno == ENOBUFS)
errno = EAGAIN;
return (-1);
}
if (n == 0) { /* connection closed */
errno = 0;
return (0);
}
/*
* assumption: fd got sent if sendmsg sent anything
* this works because fds are passed one at a time
*/
if (buf != NULL && buf->fd != -1) {
close(buf->fd);
buf->fd = -1;
}
msgbuf_drain(msgbuf, n);
return (n);
}
void
m_forward(struct mproc *p, struct imsg *imsg)
{
imsg_compose(&p->imsgbuf, imsg->hdr.type, imsg->hdr.peerid,
imsg->hdr.pid, imsg->fd, imsg->data,
imsg->hdr.len - sizeof(imsg->hdr));
log_trace(TRACE_MPROC, "mproc: %s -> %s : %zu %s (forward)",
proc_name(smtpd_process),
proc_name(p->proc),
imsg->hdr.len - sizeof(imsg->hdr),
imsg_to_str(imsg->hdr.type));
p->msg_out += 1;
p->bytes_queued += imsg->hdr.len;
if (p->bytes_queued > p->bytes_queued_max)
p->bytes_queued_max = p->bytes_queued;
mproc_event_add(p);
}
void
m_compose(struct mproc *p, uint32_t type, uint32_t peerid, pid_t pid, int fd,
void *data, size_t len)
{
imsg_compose(&p->imsgbuf, type, peerid, pid, fd, data, len);
log_trace(TRACE_MPROC, "mproc: %s -> %s : %zu %s",
proc_name(smtpd_process),
proc_name(p->proc),
len,
imsg_to_str(type));
p->msg_out += 1;
p->bytes_queued += len + IMSG_HEADER_SIZE;
if (p->bytes_queued > p->bytes_queued_max)
p->bytes_queued_max = p->bytes_queued;
mproc_event_add(p);
}
void
m_composev(struct mproc *p, uint32_t type, uint32_t peerid, pid_t pid,
int fd, const struct iovec *iov, int n)
{
size_t len;
int i;
imsg_composev(&p->imsgbuf, type, peerid, pid, fd, iov, n);
len = 0;
for (i = 0; i < n; i++)
len += iov[i].iov_len;
p->msg_out += 1;
p->bytes_queued += IMSG_HEADER_SIZE + len;
if (p->bytes_queued > p->bytes_queued_max)
p->bytes_queued_max = p->bytes_queued;
log_trace(TRACE_MPROC, "mproc: %s -> %s : %zu %s",
proc_name(smtpd_process),
proc_name(p->proc),
len,
imsg_to_str(type));
mproc_event_add(p);
}
void
m_create(struct mproc *p, uint32_t type, uint32_t peerid, pid_t pid, int fd)
{
if (p->m_buf == NULL) {
p->m_alloc = 128;
log_trace(TRACE_MPROC, "mproc: %s -> %s: allocating %zu",
proc_name(smtpd_process),
proc_name(p->proc),
p->m_alloc);
p->m_buf = malloc(p->m_alloc);
if (p->m_buf == NULL)
fatal("warn: m_create: malloc");
}
p->m_pos = 0;
p->m_type = type;
p->m_peerid = peerid;
p->m_pid = pid;
p->m_fd = fd;
}
void
m_add(struct mproc *p, const void *data, size_t len)
{
size_t alloc;
void *tmp;
if (p->m_pos + len + IMSG_HEADER_SIZE > MAX_IMSGSIZE) {
log_warnx("warn: message to large");
fatal(NULL);
}
alloc = p->m_alloc;
while (p->m_pos + len > alloc)
alloc *= 2;
if (alloc != p->m_alloc) {
log_trace(TRACE_MPROC, "mproc: %s -> %s: realloc %zu -> %zu",
proc_name(smtpd_process),
proc_name(p->proc),
p->m_alloc,
alloc);
tmp = realloc(p->m_buf, alloc);
if (tmp == NULL)
fatal("realloc");
p->m_alloc = alloc;
p->m_buf = tmp;
}
memmove(p->m_buf + p->m_pos, data, len);
p->m_pos += len;
}
void
m_close(struct mproc *p)
{
if (imsg_compose(&p->imsgbuf, p->m_type, p->m_peerid, p->m_pid, p->m_fd,
p->m_buf, p->m_pos) == -1)
fatal("imsg_compose");
log_trace(TRACE_MPROC, "mproc: %s -> %s : %zu %s",
proc_name(smtpd_process),
proc_name(p->proc),
p->m_pos,
imsg_to_str(p->m_type));
p->msg_out += 1;
p->bytes_queued += p->m_pos + IMSG_HEADER_SIZE;
if (p->bytes_queued > p->bytes_queued_max)
p->bytes_queued_max = p->bytes_queued;
mproc_event_add(p);
}
static struct imsg * current;
static void
m_error(const char *error)
{
char buf[512];
snprintf(buf, sizeof buf, "%s: %s: %s",
proc_name(smtpd_process),
imsg_to_str(current->hdr.type),
error);
fatalx(buf);
}
void
m_msg(struct msg *m, struct imsg *imsg)
{
current = imsg;
m->pos = imsg->data;
m->end = m->pos + (imsg->hdr.len - sizeof(imsg->hdr));
}
void
m_end(struct msg *m)
{
if (m->pos != m->end)
m_error("not at msg end");
}
int
m_is_eom(struct msg *m)
{
return (m->pos == m->end);
}
static inline void
m_get(struct msg *m, void *dst, size_t sz)
{
if (m->pos + sz > m->end)
m_error("msg too short");
memmove(dst, m->pos, sz);
m->pos += sz;
}
static inline void
m_get_typed(struct msg *m, uint8_t type, void *dst, size_t sz)
{
if (m->pos + 1 + sz > m->end)
m_error("msg too short");
if (*m->pos != type)
m_error("msg bad type");
memmove(dst, m->pos + 1, sz);
m->pos += sz + 1;
}
static inline void
m_get_typed_sized(struct msg *m, uint8_t type, const void **dst, size_t *sz)
{
if (m->pos + 1 + sizeof(*sz) > m->end)
m_error("msg too short");
if (*m->pos != type)
m_error("msg bad type");
memmove(sz, m->pos + 1, sizeof(*sz));
m->pos += sizeof(sz) + 1;
if (m->pos + *sz > m->end)
m_error("msg too short");
*dst = m->pos;
m->pos += *sz;
}
static void
m_add_typed(struct mproc *p, uint8_t type, const void *data, size_t len)
{
m_add(p, &type, 1);
m_add(p, data, len);
}
static void
m_add_typed_sized(struct mproc *p, uint8_t type, const void *data, size_t len)
{
m_add(p, &type, 1);
m_add(p, &len, sizeof(len));
m_add(p, data, len);
}
enum {
M_INT,
M_UINT32,
M_TIME,
M_STRING,
M_DATA,
M_ID,
M_EVPID,
M_MSGID,
M_SOCKADDR,
M_MAILADDR,
M_ENVELOPE,
};
void
m_add_int(struct mproc *m, int v)
{
m_add_typed(m, M_INT, &v, sizeof v);
};
void
m_add_u32(struct mproc *m, uint32_t u32)
{
m_add_typed(m, M_UINT32, &u32, sizeof u32);
};
void
m_add_time(struct mproc *m, time_t v)
{
m_add_typed(m, M_TIME, &v, sizeof v);
};
void
m_add_string(struct mproc *m, const char *v)
{
m_add_typed(m, M_STRING, v, strlen(v) + 1);
};
void
m_add_data(struct mproc *m, const void *v, size_t len)
{
m_add_typed_sized(m, M_DATA, v, len);
};
void
m_add_id(struct mproc *m, uint64_t v)
{
m_add_typed(m, M_ID, &v, sizeof(v));
}
void
m_add_evpid(struct mproc *m, uint64_t v)
{
m_add_typed(m, M_EVPID, &v, sizeof(v));
}
void
m_add_msgid(struct mproc *m, uint32_t v)
{
m_add_typed(m, M_MSGID, &v, sizeof(v));
}
void
m_add_sockaddr(struct mproc *m, const struct sockaddr *sa)
{
m_add_typed_sized(m, M_SOCKADDR, sa, sa->sa_len);
}
void
m_add_mailaddr(struct mproc *m, const struct mailaddr *maddr)
{
m_add_typed(m, M_MAILADDR, maddr, sizeof(*maddr));
}
#ifndef BUILD_FILTER
void
m_add_envelope(struct mproc *m, const struct envelope *evp)
{
#if 0
m_add_typed(m, M_ENVELOPE, evp, sizeof(*evp));
#else
char buf[sizeof(*evp)];
envelope_dump_buffer(evp, buf, sizeof(buf));
m_add_evpid(m, evp->id);
m_add_typed_sized(m, M_ENVELOPE, buf, strlen(buf) + 1);
#endif
}
#endif
void
m_get_int(struct msg *m, int *i)
{
m_get_typed(m, M_INT, i, sizeof(*i));
}
void
m_get_u32(struct msg *m, uint32_t *u32)
{
m_get_typed(m, M_UINT32, u32, sizeof(*u32));
}
void
m_get_time(struct msg *m, time_t *t)
{
m_get_typed(m, M_TIME, t, sizeof(*t));
}
void
m_get_string(struct msg *m, const char **s)
{
uint8_t *end;
if (m->pos + 2 > m->end)
m_error("msg too short");
if (*m->pos != M_STRING)
m_error("bad msg type");
end = memchr(m->pos + 1, 0, m->end - (m->pos + 1));
if (end == NULL)
m_error("unterminated string");
*s = m->pos + 1;
m->pos = end + 1;
}
void
m_get_data(struct msg *m, const void **data, size_t *sz)
{
m_get_typed_sized(m, M_DATA, data, sz);
}
void
m_get_evpid(struct msg *m, uint64_t *evpid)
{
m_get_typed(m, M_EVPID, evpid, sizeof(*evpid));
}
void
m_get_msgid(struct msg *m, uint32_t *msgid)
{
m_get_typed(m, M_MSGID, msgid, sizeof(*msgid));
}
void
m_get_id(struct msg *m, uint64_t *id)
{
m_get_typed(m, M_ID, id, sizeof(*id));
}
void
m_get_sockaddr(struct msg *m, struct sockaddr *sa)
{
size_t s;
const void *d;
m_get_typed_sized(m, M_SOCKADDR, &d, &s);
memmove(sa, d, s);
}
void
m_get_mailaddr(struct msg *m, struct mailaddr *maddr)
{
m_get_typed(m, M_MAILADDR, maddr, sizeof(*maddr));
}
#ifndef BUILD_FILTER
void
m_get_envelope(struct msg *m, struct envelope *evp)
{
#if 0
m_get_typed(m, M_ENVELOPE, evp, sizeof(*evp));
#else
uint64_t evpid;
size_t s;
const void *d;
m_get_evpid(m, &evpid);
m_get_typed_sized(m, M_ENVELOPE, &d, &s);
if (!envelope_load_buffer(evp, d, s - 1))
fatalx("failed to retrieve envelope");
evp->id = evpid;
#endif
}
#endif
|