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io.c
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io.c
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/*
* Socket and pipe I/O utilities used in rsync.
*
* Copyright (C) 1996-2001 Andrew Tridgell
* Copyright (C) 1996 Paul Mackerras
* Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org>
* Copyright (C) 2003-2009 Wayne Davison
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, visit the http://fsf.org website.
*/
/* Rsync provides its own multiplexing system, which is used to send
* stderr and stdout over a single socket.
*
* For historical reasons this is off during the start of the
* connection, but it's switched on quite early using
* io_start_multiplex_out() and io_start_multiplex_in(). */
#include "rsync.h"
#include "ifuncs.h"
/** If no timeout is specified then use a 60 second select timeout */
#define SELECT_TIMEOUT 60
extern int bwlimit;
extern size_t bwlimit_writemax;
extern int io_timeout;
extern int am_server;
extern int am_daemon;
extern int am_sender;
extern int am_generator;
extern int inc_recurse;
extern int io_error;
extern int eol_nulls;
extern int flist_eof;
extern int list_only;
extern int read_batch;
extern int compat_flags;
extern int protect_args;
extern int checksum_seed;
extern int protocol_version;
extern int remove_source_files;
extern int preserve_hard_links;
extern struct stats stats;
extern struct file_list *cur_flist;
#ifdef ICONV_OPTION
extern int filesfrom_convert;
extern iconv_t ic_send, ic_recv;
#endif
int csum_length = SHORT_SUM_LENGTH; /* initial value */
int allowed_lull = 0;
int ignore_timeout = 0;
int batch_fd = -1;
int msgdone_cnt = 0;
/* Ignore an EOF error if non-zero. See whine_about_eof(). */
int kluge_around_eof = 0;
int msg_fd_in = -1;
int msg_fd_out = -1;
int sock_f_in = -1;
int sock_f_out = -1;
static int iobuf_f_in = -1;
static char *iobuf_in;
static size_t iobuf_in_siz;
static size_t iobuf_in_ndx;
static size_t iobuf_in_remaining;
static int iobuf_f_out = -1;
static char *iobuf_out;
static int iobuf_out_cnt;
int flist_forward_from = -1;
static int io_multiplexing_out;
static int io_multiplexing_in;
static time_t last_io_in;
static time_t last_io_out;
static int no_flush;
static int write_batch_monitor_in = -1;
static int write_batch_monitor_out = -1;
static int io_filesfrom_f_in = -1;
static int io_filesfrom_f_out = -1;
static xbuf ff_buf = EMPTY_XBUF;
static char ff_lastchar;
#ifdef ICONV_OPTION
static xbuf iconv_buf = EMPTY_XBUF;
#endif
static int defer_forwarding_messages = 0, keep_defer_forwarding = 0;
static int select_timeout = SELECT_TIMEOUT;
static int active_filecnt = 0;
static OFF_T active_bytecnt = 0;
static int first_message = 1;
static char int_byte_extra[64] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* (00 - 3F)/4 */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* (40 - 7F)/4 */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* (80 - BF)/4 */
2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 5, 6, /* (C0 - FF)/4 */
};
#define REMOTE_OPTION_ERROR "rsync: on remote machine: -"
#define REMOTE_OPTION_ERROR2 ": unknown option"
enum festatus { FES_SUCCESS, FES_REDO, FES_NO_SEND };
static void check_timeout(void)
{
time_t t, chk;
if (!io_timeout || ignore_timeout)
return;
t = time(NULL);
if (!last_io_in)
last_io_in = t;
chk = MAX(last_io_out, last_io_in);
if (t - chk >= io_timeout) {
if (am_server || am_daemon)
exit_cleanup(RERR_TIMEOUT);
rprintf(FERROR, "[%s] io timeout after %d seconds -- exiting\n",
who_am_i(), (int)(t-chk));
exit_cleanup(RERR_TIMEOUT);
}
}
static void readfd(int fd, char *buffer, size_t N);
static void writefd(int fd, const char *buf, size_t len);
static void writefd_unbuffered(int fd, const char *buf, size_t len);
static void mplex_write(int fd, enum msgcode code, const char *buf, size_t len, int convert);
static flist_ndx_list redo_list, hlink_list;
struct msg_list_item {
struct msg_list_item *next;
char convert;
char buf[1];
};
struct msg_list {
struct msg_list_item *head, *tail;
};
static struct msg_list msg_queue;
static void got_flist_entry_status(enum festatus status, const char *buf)
{
int ndx = IVAL(buf, 0);
struct file_list *flist = flist_for_ndx(ndx, "got_flist_entry_status");
if (remove_source_files) {
active_filecnt--;
active_bytecnt -= F_LENGTH(flist->files[ndx - flist->ndx_start]);
}
if (inc_recurse)
flist->in_progress--;
switch (status) {
case FES_SUCCESS:
if (remove_source_files)
send_msg(MSG_SUCCESS, buf, 4, 0);
/* FALL THROUGH */
case FES_NO_SEND:
#ifdef SUPPORT_HARD_LINKS
if (preserve_hard_links) {
struct file_struct *file = flist->files[ndx - flist->ndx_start];
if (F_IS_HLINKED(file)) {
if (status == FES_NO_SEND)
flist_ndx_push(&hlink_list, -2); /* indicates a failure follows */
flist_ndx_push(&hlink_list, ndx);
flist->in_progress++;
}
}
#endif
break;
case FES_REDO:
if (read_batch) {
if (inc_recurse)
flist->in_progress++;
break;
}
if (inc_recurse)
flist->to_redo++;
flist_ndx_push(&redo_list, ndx);
break;
}
}
/* Note the fds used for the main socket (which might really be a pipe
* for a local transfer, but we can ignore that). */
void io_set_sock_fds(int f_in, int f_out)
{
sock_f_in = f_in;
sock_f_out = f_out;
}
void set_io_timeout(int secs)
{
io_timeout = secs;
allowed_lull = (io_timeout + 1) / 2;
if (!io_timeout || allowed_lull > SELECT_TIMEOUT)
select_timeout = SELECT_TIMEOUT;
else
select_timeout = allowed_lull;
if (read_batch)
allowed_lull = 0;
}
/* Setup the fd used to receive MSG_* messages. Only needed during the
* early stages of being a local sender (up through the sending of the
* file list) or when we're the generator (to fetch the messages from
* the receiver). */
void set_msg_fd_in(int fd)
{
msg_fd_in = fd;
}
/* Setup the fd used to send our MSG_* messages. Only needed when
* we're the receiver (to send our messages to the generator). */
void set_msg_fd_out(int fd)
{
msg_fd_out = fd;
set_nonblocking(msg_fd_out);
}
/* Add a message to the pending MSG_* list. */
static void msg_list_add(struct msg_list *lst, int code, const char *buf, int len, int convert)
{
struct msg_list_item *m;
int sz = len + 4 + sizeof m[0] - 1;
if (!(m = (struct msg_list_item *)new_array(char, sz)))
out_of_memory("msg_list_add");
m->next = NULL;
m->convert = convert;
SIVAL(m->buf, 0, ((code+MPLEX_BASE)<<24) | len);
memcpy(m->buf + 4, buf, len);
if (lst->tail)
lst->tail->next = m;
else
lst->head = m;
lst->tail = m;
}
static inline int flush_a_msg(int fd)
{
struct msg_list_item *m = msg_queue.head;
int len = IVAL(m->buf, 0) & 0xFFFFFF;
int tag = *((uchar*)m->buf+3) - MPLEX_BASE;
if (!(msg_queue.head = m->next))
msg_queue.tail = NULL;
defer_forwarding_messages++;
mplex_write(fd, tag, m->buf + 4, len, m->convert);
defer_forwarding_messages--;
free(m);
return len;
}
static void msg_flush(void)
{
if (am_generator) {
while (msg_queue.head && io_multiplexing_out)
stats.total_written += flush_a_msg(sock_f_out) + 4;
} else {
while (msg_queue.head)
(void)flush_a_msg(msg_fd_out);
}
}
static void check_for_d_option_error(const char *msg)
{
static char rsync263_opts[] = "BCDHIKLPRSTWabceghlnopqrtuvxz";
char *colon;
int saw_d = 0;
if (*msg != 'r'
|| strncmp(msg, REMOTE_OPTION_ERROR, sizeof REMOTE_OPTION_ERROR - 1) != 0)
return;
msg += sizeof REMOTE_OPTION_ERROR - 1;
if (*msg == '-' || (colon = strchr(msg, ':')) == NULL
|| strncmp(colon, REMOTE_OPTION_ERROR2, sizeof REMOTE_OPTION_ERROR2 - 1) != 0)
return;
for ( ; *msg != ':'; msg++) {
if (*msg == 'd')
saw_d = 1;
else if (*msg == 'e')
break;
else if (strchr(rsync263_opts, *msg) == NULL)
return;
}
if (saw_d) {
rprintf(FWARNING,
"*** Try using \"--old-d\" if remote rsync is <= 2.6.3 ***\n");
}
}
/* Read a message from the MSG_* fd and handle it. This is called either
* during the early stages of being a local sender (up through the sending
* of the file list) or when we're the generator (to fetch the messages
* from the receiver). */
static void read_msg_fd(void)
{
char buf[2048];
size_t n;
struct file_list *flist;
int fd = msg_fd_in;
int tag, len;
/* Temporarily disable msg_fd_in. This is needed to avoid looping back
* to this routine from writefd_unbuffered(). */
no_flush++;
msg_fd_in = -1;
defer_forwarding_messages++;
readfd(fd, buf, 4);
tag = IVAL(buf, 0);
len = tag & 0xFFFFFF;
tag = (tag >> 24) - MPLEX_BASE;
switch (tag) {
case MSG_DONE:
if (len < 0 || len > 1 || !am_generator) {
invalid_msg:
rprintf(FERROR, "invalid message %d:%d [%s%s]\n",
tag, len, who_am_i(),
inc_recurse ? "/inc" : "");
exit_cleanup(RERR_STREAMIO);
}
if (len) {
readfd(fd, buf, len);
stats.total_read = read_varlong(fd, 3);
}
msgdone_cnt++;
break;
case MSG_REDO:
if (len != 4 || !am_generator)
goto invalid_msg;
readfd(fd, buf, 4);
got_flist_entry_status(FES_REDO, buf);
break;
case MSG_FLIST:
if (len != 4 || !am_generator || !inc_recurse)
goto invalid_msg;
readfd(fd, buf, 4);
/* Read extra file list from receiver. */
assert(iobuf_in != NULL);
assert(iobuf_f_in == fd);
if (verbose > 3) {
rprintf(FINFO, "[%s] receiving flist for dir %d\n",
who_am_i(), IVAL(buf,0));
}
flist = recv_file_list(fd);
flist->parent_ndx = IVAL(buf,0);
#ifdef SUPPORT_HARD_LINKS
if (preserve_hard_links)
match_hard_links(flist);
#endif
break;
case MSG_FLIST_EOF:
if (len != 0 || !am_generator || !inc_recurse)
goto invalid_msg;
flist_eof = 1;
break;
case MSG_IO_ERROR:
if (len != 4)
goto invalid_msg;
readfd(fd, buf, len);
io_error |= IVAL(buf, 0);
break;
case MSG_DELETED:
if (len >= (int)sizeof buf || !am_generator)
goto invalid_msg;
readfd(fd, buf, len);
send_msg(MSG_DELETED, buf, len, 1);
break;
case MSG_SUCCESS:
if (len != 4 || !am_generator)
goto invalid_msg;
readfd(fd, buf, 4);
got_flist_entry_status(FES_SUCCESS, buf);
break;
case MSG_NO_SEND:
if (len != 4 || !am_generator)
goto invalid_msg;
readfd(fd, buf, 4);
got_flist_entry_status(FES_NO_SEND, buf);
break;
case MSG_ERROR_SOCKET:
case MSG_ERROR_UTF8:
case MSG_CLIENT:
if (!am_generator)
goto invalid_msg;
if (tag == MSG_ERROR_SOCKET)
io_end_multiplex_out();
/* FALL THROUGH */
case MSG_INFO:
case MSG_ERROR:
case MSG_ERROR_XFER:
case MSG_WARNING:
case MSG_LOG:
while (len) {
n = len;
if (n >= sizeof buf)
n = sizeof buf - 1;
readfd(fd, buf, n);
rwrite((enum logcode)tag, buf, n, !am_generator);
len -= n;
}
break;
default:
rprintf(FERROR, "unknown message %d:%d [%s]\n",
tag, len, who_am_i());
exit_cleanup(RERR_STREAMIO);
}
no_flush--;
msg_fd_in = fd;
if (!--defer_forwarding_messages && !no_flush)
msg_flush();
}
/* This is used by the generator to limit how many file transfers can
* be active at once when --remove-source-files is specified. Without
* this, sender-side deletions were mostly happening at the end. */
void increment_active_files(int ndx, int itemizing, enum logcode code)
{
while (1) {
/* TODO: tune these limits? */
int limit = active_bytecnt >= 128*1024 ? 10 : 50;
if (active_filecnt < limit)
break;
check_for_finished_files(itemizing, code, 0);
if (active_filecnt < limit)
break;
if (iobuf_out_cnt)
io_flush(NORMAL_FLUSH);
else
read_msg_fd();
}
active_filecnt++;
active_bytecnt += F_LENGTH(cur_flist->files[ndx - cur_flist->ndx_start]);
}
/* Write an message to a multiplexed stream. If this fails, rsync exits. */
static void mplex_write(int fd, enum msgcode code, const char *buf, size_t len, int convert)
{
char buffer[BIGPATHBUFLEN]; /* Oversized for use by iconv code. */
size_t n = len;
#ifdef ICONV_OPTION
/* We need to convert buf before doing anything else so that we
* can include the (converted) byte length in the message header. */
if (convert && ic_send != (iconv_t)-1) {
xbuf outbuf, inbuf;
INIT_XBUF(outbuf, buffer + 4, 0, sizeof buffer - 4);
INIT_XBUF(inbuf, (char*)buf, len, -1);
iconvbufs(ic_send, &inbuf, &outbuf,
ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE);
if (inbuf.len > 0) {
rprintf(FERROR, "overflowed conversion buffer in mplex_write");
exit_cleanup(RERR_UNSUPPORTED);
}
n = len = outbuf.len;
} else
#endif
if (n > 1024 - 4) /* BIGPATHBUFLEN can handle 1024 bytes */
n = 0; /* We'd rather do 2 writes than too much memcpy(). */
else
memcpy(buffer + 4, buf, n);
SIVAL(buffer, 0, ((MPLEX_BASE + (int)code)<<24) + len);
keep_defer_forwarding++; /* defer_forwarding_messages++ on return */
writefd_unbuffered(fd, buffer, n+4);
keep_defer_forwarding--;
if (len > n)
writefd_unbuffered(fd, buf+n, len-n);
if (!--defer_forwarding_messages && !no_flush)
msg_flush();
}
int send_msg(enum msgcode code, const char *buf, int len, int convert)
{
if (msg_fd_out < 0) {
if (!defer_forwarding_messages)
return io_multiplex_write(code, buf, len, convert);
if (!io_multiplexing_out)
return 0;
msg_list_add(&msg_queue, code, buf, len, convert);
return 1;
}
if (flist_forward_from >= 0)
msg_list_add(&msg_queue, code, buf, len, convert);
else
mplex_write(msg_fd_out, code, buf, len, convert);
return 1;
}
void send_msg_int(enum msgcode code, int num)
{
char numbuf[4];
SIVAL(numbuf, 0, num);
send_msg(code, numbuf, 4, 0);
}
void wait_for_receiver(void)
{
if (io_flush(NORMAL_FLUSH))
return;
read_msg_fd();
}
int get_redo_num(void)
{
return flist_ndx_pop(&redo_list);
}
int get_hlink_num(void)
{
return flist_ndx_pop(&hlink_list);
}
/**
* When we're the receiver and we have a local --files-from list of names
* that needs to be sent over the socket to the sender, we have to do two
* things at the same time: send the sender a list of what files we're
* processing and read the incoming file+info list from the sender. We do
* this by augmenting the read_timeout() function to copy this data. It
* uses ff_buf to read a block of data from f_in (when it is ready, since
* it might be a pipe) and then blast it out f_out (when it is ready to
* receive more data).
*/
void io_set_filesfrom_fds(int f_in, int f_out)
{
io_filesfrom_f_in = f_in;
io_filesfrom_f_out = f_out;
alloc_xbuf(&ff_buf, 2048);
#ifdef ICONV_OPTION
if (protect_args)
alloc_xbuf(&iconv_buf, 1024);
#endif
}
/* It's almost always an error to get an EOF when we're trying to read from the
* network, because the protocol is (for the most part) self-terminating.
*
* There is one case for the receiver when it is at the end of the transfer
* (hanging around reading any keep-alive packets that might come its way): if
* the sender dies before the generator's kill-signal comes through, we can end
* up here needing to loop until the kill-signal arrives. In this situation,
* kluge_around_eof will be < 0.
*
* There is another case for older protocol versions (< 24) where the module
* listing was not terminated, so we must ignore an EOF error in that case and
* exit. In this situation, kluge_around_eof will be > 0. */
static void whine_about_eof(int fd)
{
if (kluge_around_eof && fd == sock_f_in) {
int i;
if (kluge_around_eof > 0)
exit_cleanup(0);
/* If we're still here after 10 seconds, exit with an error. */
for (i = 10*1000/20; i--; )
msleep(20);
}
rprintf(FERROR, RSYNC_NAME ": connection unexpectedly closed "
"(%.0f bytes received so far) [%s]\n",
(double)stats.total_read, who_am_i());
exit_cleanup(RERR_STREAMIO);
}
/**
* Read from a socket with I/O timeout. return the number of bytes
* read. If no bytes can be read then exit, never return a number <= 0.
*
* TODO: If the remote shell connection fails, then current versions
* actually report an "unexpected EOF" error here. Since it's a
* fairly common mistake to try to use rsh when ssh is required, we
* should trap that: if we fail to read any data at all, we should
* give a better explanation. We can tell whether the connection has
* started by looking e.g. at whether the remote version is known yet.
*/
static int read_timeout(int fd, char *buf, size_t len)
{
int n, cnt = 0;
io_flush(FULL_FLUSH);
while (cnt == 0) {
/* until we manage to read *something* */
fd_set r_fds, w_fds;
struct timeval tv;
int maxfd = fd;
int count;
FD_ZERO(&r_fds);
FD_ZERO(&w_fds);
FD_SET(fd, &r_fds);
if (io_filesfrom_f_out >= 0) {
int new_fd;
if (ff_buf.len == 0) {
if (io_filesfrom_f_in >= 0) {
FD_SET(io_filesfrom_f_in, &r_fds);
new_fd = io_filesfrom_f_in;
} else {
io_filesfrom_f_out = -1;
new_fd = -1;
}
} else {
FD_SET(io_filesfrom_f_out, &w_fds);
new_fd = io_filesfrom_f_out;
}
if (new_fd > maxfd)
maxfd = new_fd;
}
tv.tv_sec = select_timeout;
tv.tv_usec = 0;
errno = 0;
count = select(maxfd + 1, &r_fds, &w_fds, NULL, &tv);
if (count <= 0) {
if (errno == EBADF) {
defer_forwarding_messages = 0;
exit_cleanup(RERR_SOCKETIO);
}
check_timeout();
continue;
}
if (io_filesfrom_f_out >= 0) {
if (ff_buf.len) {
if (FD_ISSET(io_filesfrom_f_out, &w_fds)) {
int l = write(io_filesfrom_f_out,
ff_buf.buf + ff_buf.pos,
ff_buf.len);
if (l > 0) {
if (!(ff_buf.len -= l))
ff_buf.pos = 0;
else
ff_buf.pos += l;
} else if (errno != EINTR) {
/* XXX should we complain? */
io_filesfrom_f_out = -1;
}
}
} else if (io_filesfrom_f_in >= 0) {
if (FD_ISSET(io_filesfrom_f_in, &r_fds)) {
#ifdef ICONV_OPTION
xbuf *ibuf = filesfrom_convert ? &iconv_buf : &ff_buf;
#else
xbuf *ibuf = &ff_buf;
#endif
int l = read(io_filesfrom_f_in, ibuf->buf, ibuf->size);
if (l <= 0) {
if (l == 0 || errno != EINTR) {
/* Send end-of-file marker */
memcpy(ff_buf.buf, "\0\0", 2);
ff_buf.len = ff_lastchar? 2 : 1;
ff_buf.pos = 0;
io_filesfrom_f_in = -1;
}
} else {
#ifdef ICONV_OPTION
if (filesfrom_convert) {
iconv_buf.pos = 0;
iconv_buf.len = l;
iconvbufs(ic_send, &iconv_buf, &ff_buf,
ICB_EXPAND_OUT|ICB_INCLUDE_BAD|ICB_INCLUDE_INCOMPLETE);
l = ff_buf.len;
}
#endif
if (!eol_nulls) {
char *s = ff_buf.buf + l;
/* Transform CR and/or LF into '\0' */
while (s-- > ff_buf.buf) {
if (*s == '\n' || *s == '\r')
*s = '\0';
}
}
if (!ff_lastchar) {
/* Last buf ended with a '\0', so don't
* let this buf start with one. */
while (l && ff_buf.buf[ff_buf.pos] == '\0')
ff_buf.pos++, l--;
}
if (!l)
ff_buf.pos = 0;
else {
char *f = ff_buf.buf + ff_buf.pos;
char *t = f;
char *eob = f + l;
/* Eliminate any multi-'\0' runs. */
while (f != eob) {
if (!(*t++ = *f++)) {
while (f != eob && !*f)
f++, l--;
}
}
ff_lastchar = f[-1];
}
ff_buf.len = l;
}
}
}
}
if (!FD_ISSET(fd, &r_fds))
continue;
n = read(fd, buf, len);
if (n <= 0) {
if (n == 0)
whine_about_eof(fd); /* Doesn't return. */
if (errno == EINTR || errno == EWOULDBLOCK
|| errno == EAGAIN)
continue;
/* Don't write errors on a dead socket. */
if (fd == sock_f_in) {
io_end_multiplex_out();
rsyserr(FERROR_SOCKET, errno, "read error");
} else
rsyserr(FERROR, errno, "read error");
exit_cleanup(RERR_STREAMIO);
}
buf += n;
len -= n;
cnt += n;
if (fd == sock_f_in && io_timeout)
last_io_in = time(NULL);
}
return cnt;
}
/* Read a line into the "buf" buffer. */
int read_line(int fd, char *buf, size_t bufsiz, int flags)
{
char ch, *s, *eob;
int cnt;
#ifdef ICONV_OPTION
if (flags & RL_CONVERT && iconv_buf.size < bufsiz)
realloc_xbuf(&iconv_buf, bufsiz + 1024);
#endif
start:
#ifdef ICONV_OPTION
s = flags & RL_CONVERT ? iconv_buf.buf : buf;
#else
s = buf;
#endif
eob = s + bufsiz - 1;
while (1) {
cnt = read(fd, &ch, 1);
if (cnt < 0 && (errno == EWOULDBLOCK
|| errno == EINTR || errno == EAGAIN)) {
struct timeval tv;
fd_set r_fds, e_fds;
FD_ZERO(&r_fds);
FD_SET(fd, &r_fds);
FD_ZERO(&e_fds);
FD_SET(fd, &e_fds);
tv.tv_sec = select_timeout;
tv.tv_usec = 0;
if (!select(fd+1, &r_fds, NULL, &e_fds, &tv))
check_timeout();
/*if (FD_ISSET(fd, &e_fds))
rprintf(FINFO, "select exception on fd %d\n", fd); */
continue;
}
if (cnt != 1)
break;
if (flags & RL_EOL_NULLS ? ch == '\0' : (ch == '\r' || ch == '\n')) {
/* Skip empty lines if dumping comments. */
if (flags & RL_DUMP_COMMENTS && s == buf)
continue;
break;
}
if (s < eob)
*s++ = ch;
}
*s = '\0';
if (flags & RL_DUMP_COMMENTS && (*buf == '#' || *buf == ';'))
goto start;
#ifdef ICONV_OPTION
if (flags & RL_CONVERT) {
xbuf outbuf;
INIT_XBUF(outbuf, buf, 0, bufsiz);
iconv_buf.pos = 0;
iconv_buf.len = s - iconv_buf.buf;
iconvbufs(ic_recv, &iconv_buf, &outbuf,
ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE);
outbuf.buf[outbuf.len] = '\0';
return outbuf.len;
}
#endif
return s - buf;
}
void read_args(int f_in, char *mod_name, char *buf, size_t bufsiz, int rl_nulls,
char ***argv_p, int *argc_p, char **request_p)
{
int maxargs = MAX_ARGS;
int dot_pos = 0;
int argc = 0;
char **argv, *p;
int rl_flags = (rl_nulls ? RL_EOL_NULLS : 0);
#ifdef ICONV_OPTION
rl_flags |= (protect_args && ic_recv != (iconv_t)-1 ? RL_CONVERT : 0);
#endif
if (!(argv = new_array(char *, maxargs)))
out_of_memory("read_args");
if (mod_name && !protect_args)
argv[argc++] = "rsyncd";
while (1) {
if (read_line(f_in, buf, bufsiz, rl_flags) == 0)
break;
if (argc == maxargs-1) {
maxargs += MAX_ARGS;
if (!(argv = realloc_array(argv, char *, maxargs)))
out_of_memory("read_args");
}
if (dot_pos) {
if (request_p) {
*request_p = strdup(buf);
request_p = NULL;
}
if (mod_name)
glob_expand_module(mod_name, buf, &argv, &argc, &maxargs);
else
glob_expand(buf, &argv, &argc, &maxargs);
} else {
if (!(p = strdup(buf)))
out_of_memory("read_args");
argv[argc++] = p;
if (*p == '.' && p[1] == '\0')
dot_pos = argc;
}
}
argv[argc] = NULL;
glob_expand(NULL, NULL, NULL, NULL);
*argc_p = argc;
*argv_p = argv;
}
int io_start_buffering_out(int f_out)
{
if (iobuf_out) {
assert(f_out == iobuf_f_out);
return 0;
}
if (!(iobuf_out = new_array(char, IO_BUFFER_SIZE)))
out_of_memory("io_start_buffering_out");
iobuf_out_cnt = 0;
iobuf_f_out = f_out;
return 1;
}
int io_start_buffering_in(int f_in)
{
if (iobuf_in) {
assert(f_in == iobuf_f_in);
return 0;
}
iobuf_in_siz = 2 * IO_BUFFER_SIZE;
if (!(iobuf_in = new_array(char, iobuf_in_siz)))
out_of_memory("io_start_buffering_in");
iobuf_f_in = f_in;
return 1;
}
void io_end_buffering_in(void)
{
if (!iobuf_in)
return;
free(iobuf_in);
iobuf_in = NULL;
iobuf_in_ndx = 0;
iobuf_in_remaining = 0;
iobuf_f_in = -1;
}
void io_end_buffering_out(void)
{
if (!iobuf_out)
return;
io_flush(FULL_FLUSH);
free(iobuf_out);
iobuf_out = NULL;
iobuf_f_out = -1;
}
void maybe_flush_socket(int important)
{
if (iobuf_out && iobuf_out_cnt
&& (important || time(NULL) - last_io_out >= 5))
io_flush(NORMAL_FLUSH);
}
void maybe_send_keepalive(void)
{
if (time(NULL) - last_io_out >= allowed_lull) {
if (!iobuf_out || !iobuf_out_cnt) {
if (protocol_version < 29)
send_msg(MSG_DATA, "", 0, 0);
else if (protocol_version >= 30)
send_msg(MSG_NOOP, "", 0, 0);
else {
write_int(sock_f_out, cur_flist->used);
write_shortint(sock_f_out, ITEM_IS_NEW);
}
}
if (iobuf_out)
io_flush(NORMAL_FLUSH);
}
}
void start_flist_forward(int f_in)
{
assert(iobuf_out != NULL);
assert(iobuf_f_out == msg_fd_out);
flist_forward_from = f_in;
defer_forwarding_messages++;
}
void stop_flist_forward(void)
{
flist_forward_from = -1;
defer_forwarding_messages--;
io_flush(FULL_FLUSH);
}
/**
* Continue trying to read len bytes - don't return until len has been
* read.
**/
static void read_loop(int fd, char *buf, size_t len)
{
while (len) {
int n = read_timeout(fd, buf, len);
buf += n;
len -= n;
}
}
/**