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program-client-remote.c
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program-client-remote.c
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/* Copyright (c) 2002-2017 Dovecot authors, see the included COPYING file
*/
#include "lib.h"
#include "ioloop.h"
#include "str.h"
#include "strescape.h"
#include "array.h"
#include "net.h"
#include "write-full.h"
#include "eacces-error.h"
#include "istream-private.h"
#include "ostream.h"
#include "program-client-private.h"
#include <unistd.h>
#include <sys/wait.h>
#include <sysexits.h>
#define PROGRAM_CLIENT_VERSION_MAJOR "4"
#define PROGRAM_CLIENT_VERSION_MINOR "0"
#define PROGRAM_CLIENT_VERSION_STRING "VERSION\tscript\t" \
PROGRAM_CLIENT_VERSION_MAJOR "\t" \
PROGRAM_CLIENT_VERSION_MINOR "\n"
/*
* Script client input stream
*/
struct program_client_istream {
struct istream_private istream;
struct stat statbuf;
struct program_client *client;
};
static
void program_client_istream_destroy(struct iostream_private *stream)
{
struct program_client_istream *scstream =
(struct program_client_istream *) stream;
i_stream_unref(&scstream->istream.parent);
}
static ssize_t
program_client_istream_read(struct istream_private *stream)
{
struct program_client_istream *scstream =
(struct program_client_istream *) stream;
size_t pos, reserved;
ssize_t ret = 0;
i_stream_skip(stream->parent, stream->skip);
stream->skip = 0;
stream->buffer = i_stream_get_data(stream->parent, &pos);
reserved = 0;
if (stream->buffer != NULL && pos >= 1) {
/* retain/hide potential return code at end of buffer */
reserved = (stream->buffer[pos - 1] == '\n' && pos > 1 ? 2 : 1);
pos -= reserved;
}
if (stream->parent->eof) {
if (pos == 0)
i_stream_skip(stream->parent, reserved);
stream->istream.eof = TRUE;
ret = -1;
} else
do {
if ((ret = i_stream_read(stream->parent)) == -2) {
return -2; /* input buffer full */
}
if (ret == 0 || (ret < 0 && !stream->parent->eof))
break;
stream->istream.stream_errno =
stream->parent->stream_errno;
stream->buffer =
i_stream_get_data(stream->parent, &pos);
if (stream->parent->eof) {
/* Check return code at EOF */
if (stream->buffer != NULL && pos >= 2 &&
stream->buffer[pos - 1] == '\n') {
switch (stream->buffer[pos - 2]) {
case '+':
scstream->client->exit_code = 1;
break;
case '-':
scstream->client->exit_code = 0;
break;
default:
scstream->client->exit_code =
-1;
}
} else {
scstream->client->exit_code = -1;
}
}
if (stream->buffer != NULL && pos >= 1) {
/* retain/hide potential return code at end of buffer */
size_t old_reserved = reserved;
ssize_t reserve_mod;
reserved = (stream->buffer[pos - 1] == '\n' &&
pos > 1 ? 2 : 1);
reserve_mod = reserved - old_reserved;
pos -= reserved;
if (ret >= reserve_mod) {
ret -= reserve_mod;
}
}
if (ret <= 0 && stream->parent->eof) {
/* Parent EOF and not more data to return; EOF here as well */
if (pos == 0)
i_stream_skip(stream->parent, reserved);
stream->istream.eof = TRUE;
ret = -1;
}
} while (ret == 0);
stream->pos = pos;
i_assert(ret != -1 || stream->istream.eof ||
stream->istream.stream_errno != 0);
return ret;
}
static
void ATTR_NORETURN program_client_istream_sync(struct istream_private *stream ATTR_UNUSED)
{
i_panic("program_client_istream sync() not implemented");
}
static
int program_client_istream_stat(struct istream_private *stream, bool exact)
{
struct program_client_istream *scstream =
(struct program_client_istream *) stream;
const struct stat *st;
int ret;
/* Stat the original stream */
ret = i_stream_stat(stream->parent, exact, &st);
if (ret < 0 || st->st_size == -1 || !exact)
return ret;
scstream->statbuf = *st;
scstream->statbuf.st_size = -1;
return ret;
}
static
struct istream *program_client_istream_create(struct program_client *program_client,
struct istream *input)
{
struct program_client_istream *scstream;
scstream = i_new(struct program_client_istream, 1);
scstream->client = program_client;
scstream->istream.max_buffer_size = input->real_stream->max_buffer_size;
scstream->istream.iostream.destroy = program_client_istream_destroy;
scstream->istream.read = program_client_istream_read;
scstream->istream.sync = program_client_istream_sync;
scstream->istream.stat = program_client_istream_stat;
scstream->istream.istream.readable_fd = FALSE;
scstream->istream.istream.blocking = input->blocking;
scstream->istream.istream.seekable = FALSE;
i_stream_seek(input, 0);
return i_stream_create(&scstream->istream, input, -1);
}
/*
* Program client
*/
struct program_client_remote {
struct program_client client;
bool noreply:1;
};
static
void program_client_remote_connected(struct program_client *pclient)
{
struct program_client_remote *prclient =
(struct program_client_remote *) pclient;
const char **args = pclient->args;
string_t *str;
io_remove(&pclient->io);
program_client_init_streams(pclient);
if (!prclient->noreply) {
struct istream *is = pclient->program_input;
pclient->program_input =
program_client_istream_create(pclient, pclient->program_input);
i_stream_unref(&is);
}
str = t_str_new(1024);
str_append(str, PROGRAM_CLIENT_VERSION_STRING);
if (array_is_created(&pclient->envs)) {
const char *const *env;
array_foreach(&pclient->envs, env) {
str_append(str, "env_");
str_append_tabescaped(str, *env);
str_append_c(str, '\n');
}
}
if (prclient->noreply)
str_append(str, "noreply\n");
else
str_append(str, "-\n");
if (args != NULL) {
for(; *args != NULL; args++) {
str_append_tabescaped(str, *args);
str_append_c(str, '\n');
}
}
str_append_c(str, '\n');
if (o_stream_send(pclient->program_output,
str_data(str), str_len(str)) < 0) {
i_error("write(%s) failed: %s",
o_stream_get_name(pclient->program_output),
o_stream_get_error(pclient->program_output));
program_client_fail(pclient, PROGRAM_CLIENT_ERROR_IO);
return;
}
(void)program_client_connected(pclient);
}
static
int program_client_remote_connect(struct program_client *pclient)
{
struct program_client_remote *prclient =
(struct program_client_remote *) pclient;
int fd;
if ((fd = net_connect_unix_with_retries(pclient->path, 1000)) < 0) {
switch (errno) {
case EACCES:
i_error("%s",
eacces_error_get("net_connect_unix",
pclient->path));
return -1;
default:
i_error("net_connect_unix(%s) failed: %m",
pclient->path);
return -1;
}
}
net_set_nonblock(fd, TRUE);
pclient->fd_in = (prclient->noreply && pclient->output == NULL &&
!pclient->output_seekable ? -1 : fd);
pclient->fd_out = fd;
pclient->io =
io_add(fd, IO_WRITE, program_client_remote_connected, pclient);
return 0;
}
static
int program_client_remote_close_output(struct program_client *pclient)
{
int fd_out = pclient->fd_out, fd_in = pclient->fd_in;
pclient->fd_out = -1;
/* Shutdown output; program stdin will get EOF */
if (fd_out >= 0) {
if (fd_in >= 0) {
if (shutdown(fd_out, SHUT_WR) < 0 && errno != ENOTCONN) {
i_error("shutdown(%s, SHUT_WR) failed: %m",
pclient->path);
return -1;
}
} else if (close(fd_out) < 0) {
i_error("close(%s) failed: %m", pclient->path);
return -1;
}
}
return 1;
}
static
void program_client_remote_disconnect(struct program_client *pclient, bool force)
{
struct program_client_remote *prclient =
(struct program_client_remote *)pclient;
if (pclient->error == PROGRAM_CLIENT_ERROR_NONE && !prclient->noreply &&
pclient->program_input != NULL && !force) {
const unsigned char *data;
size_t size;
/* Skip any remaining program output and parse the exit code */
while (i_stream_read_more
(pclient->program_input, &data, &size) > 0) {
i_stream_skip(pclient->program_input, size);
}
/* Get exit code */
if (!pclient->program_input->eof)
pclient->exit_code = -1;
} else {
pclient->exit_code = 1;
}
program_client_disconnected(pclient);
}
static
void program_client_remote_switch_ioloop(struct program_client *pclient ATTR_UNUSED)
{
}
struct program_client *
program_client_remote_create(const char *socket_path, const char *const *args,
const struct program_client_settings *set,
bool noreply)
{
struct program_client_remote *pclient;
pool_t pool;
pool = pool_alloconly_create("program client remote", 1024);
pclient = p_new(pool, struct program_client_remote, 1);
program_client_init(&pclient->client, pool, socket_path, args, set);
pclient->client.connect = program_client_remote_connect;
pclient->client.close_output = program_client_remote_close_output;
pclient->client.disconnect = program_client_remote_disconnect;
pclient->client.switch_ioloop = program_client_remote_switch_ioloop;
pclient->noreply = noreply;
return &pclient->client;
}