X-Git-Url: https://mattmccutchen.net/rsync/rsync.git/blobdiff_plain/574c250093f19e1876c4af0de704ac219783b805..4a19c3b254b01c298fe25d72f450a760278e9386:/io.c diff --git a/io.c b/io.c index 2a7d7762..02511764 100644 --- a/io.c +++ b/io.c @@ -1,8 +1,10 @@ -/* -*- c-file-style: "linux" -*- +/* + * Socket and pipe I/O utilities used in rsync. * - * Copyright (C) 1996-2001 by Andrew Tridgell - * Copyright (C) Paul Mackerras 1996 - * Copyright (C) 2001, 2002 by Martin Pool + * Copyright (C) 1996-2001 Andrew Tridgell + * Copyright (C) 1996 Paul Mackerras + * Copyright (C) 2001, 2002 Martin Pool + * Copyright (C) 2003, 2004, 2005, 2006 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 @@ -14,25 +16,17 @@ * 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, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ -/** - * @file io.c - * - * Socket and pipe I/O utilities used in rsync. - * - * rsync provides its own multiplexing system, which is used to send - * stderr and stdout over a single socket. We need this because - * stdout normally carries the binary data stream, and stderr all our - * error messages. +/* 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(). - **/ + * io_start_multiplex_out() and io_start_multiplex_in(). */ #include "rsync.h" @@ -41,55 +35,40 @@ extern int bwlimit; extern size_t bwlimit_writemax; -extern int verbose; extern int io_timeout; +extern int allowed_lull; extern int am_server; extern int am_daemon; extern int am_sender; extern int am_generator; extern int eol_nulls; +extern int read_batch; extern int csum_length; extern int checksum_seed; extern int protocol_version; -extern char *remote_filesfrom_file; +extern int remove_source_files; +extern int preserve_hard_links; +extern char *filesfrom_host; extern struct stats stats; +extern struct file_list *the_file_list; const char phase_unknown[] = "unknown"; -int select_timeout = SELECT_TIMEOUT; int ignore_timeout = 0; int batch_fd = -1; int batch_gen_fd = -1; -/** - * The connection might be dropped at some point; perhaps because the - * remote instance crashed. Just giving the offset on the stream is - * not very helpful. So instead we try to make io_phase_name point to - * something useful. - * - * For buffered/multiplexed I/O these names will be somewhat - * approximate; perhaps for ease of support we would rather make the - * buffer always flush when a single application-level I/O finishes. - * - * @todo Perhaps we want some simple stack functionality, but there's - * no need to overdo it. - **/ -const char *io_write_phase = phase_unknown; -const char *io_read_phase = phase_unknown; - -/* Ignore an EOF error if non-zero. We exit if the value is 1 (used while - * reading a module listing if the remote version is 24 or less) or go into a - * sleep loop if the value is 2 (used by the receiver when it is reading a - * potential end-of-transfer keep-alive message that may never come). */ +/* 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 io_multiplexing_out; static int io_multiplexing_in; -static int sock_f_in = -1; -static int sock_f_out = -1; -static time_t last_io; +static time_t last_io_in; +static time_t last_io_out; static int no_flush; static int write_batch_monitor_in = -1; @@ -101,39 +80,67 @@ static char io_filesfrom_buf[2048]; static char *io_filesfrom_bp; static char io_filesfrom_lastchar; static int io_filesfrom_buflen; +static int defer_forwarding_messages = 0; +static int select_timeout = SELECT_TIMEOUT; +static int active_filecnt = 0; +static OFF_T active_bytecnt = 0; static void read_loop(int fd, char *buf, size_t len); -struct redo_list { - struct redo_list *next; - int num; +struct flist_ndx_item { + struct flist_ndx_item *next; + int ndx; }; -static struct redo_list *redo_list_head; -static struct redo_list *redo_list_tail; +struct flist_ndx_list { + struct flist_ndx_item *head, *tail; +}; -struct msg_list { - struct msg_list *next; - char *buf; +static struct flist_ndx_list redo_list, hlink_list; + +struct msg_list_item { + struct msg_list_item *next; int len; + char buf[1]; +}; + +struct msg_list { + struct msg_list_item *head, *tail; }; -static struct msg_list *msg_list_head; -static struct msg_list *msg_list_tail; +static struct msg_list msg2genr, msg2sndr; -static void redo_list_add(int num) +static void flist_ndx_push(struct flist_ndx_list *lp, int ndx) { - struct redo_list *rl; - - if (!(rl = new(struct redo_list))) - exit_cleanup(RERR_MALLOC); - rl->next = NULL; - rl->num = num; - if (redo_list_tail) - redo_list_tail->next = rl; + struct flist_ndx_item *item; + + if (!(item = new(struct flist_ndx_item))) + out_of_memory("flist_ndx_push"); + item->next = NULL; + item->ndx = ndx; + if (lp->tail) + lp->tail->next = item; else - redo_list_head = rl; - redo_list_tail = rl; + lp->head = item; + lp->tail = item; +} + +static int flist_ndx_pop(struct flist_ndx_list *lp) +{ + struct flist_ndx_item *next; + int ndx; + + if (!lp->head) + return -1; + + ndx = lp->head->ndx; + next = lp->head->next; + free(lp->head); + lp->head = next; + if (!next) + lp->tail = NULL; + + return ndx; } static void check_timeout(void) @@ -143,17 +150,17 @@ static void check_timeout(void) if (!io_timeout || ignore_timeout) return; - if (!last_io) { - last_io = time(NULL); + if (!last_io_in) { + last_io_in = time(NULL); return; } t = time(NULL); - if (t - last_io >= io_timeout) { + if (t - last_io_in >= io_timeout) { if (!am_server && !am_daemon) { rprintf(FERROR, "io timeout after %d seconds -- exiting\n", - (int)(t-last_io)); + (int)(t-last_io_in)); } exit_cleanup(RERR_TIMEOUT); } @@ -167,6 +174,18 @@ void io_set_sock_fds(int f_in, int f_out) sock_f_out = f_out; } +void set_io_timeout(int secs) +{ + io_timeout = secs; + + if (!io_timeout || io_timeout > SELECT_TIMEOUT) + select_timeout = SELECT_TIMEOUT; + else + select_timeout = io_timeout; + + allowed_lull = read_batch ? 0 : (io_timeout + 1) / 2; +} + /* 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 @@ -185,33 +204,22 @@ void set_msg_fd_out(int fd) } /* Add a message to the pending MSG_* list. */ -static void msg_list_add(int code, char *buf, int len) +static void msg_list_add(struct msg_list *lst, int code, const char *buf, int len) { - struct msg_list *ml; - - if (!(ml = new(struct msg_list))) - exit_cleanup(RERR_MALLOC); - ml->next = NULL; - if (!(ml->buf = new_array(char, len+4))) - exit_cleanup(RERR_MALLOC); - SIVAL(ml->buf, 0, ((code+MPLEX_BASE)<<24) | len); - memcpy(ml->buf+4, buf, len); - ml->len = len+4; - if (msg_list_tail) - msg_list_tail->next = ml; + 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->len = len + 4; + SIVAL(m->buf, 0, ((code+MPLEX_BASE)<<24) | len); + memcpy(m->buf + 4, buf, len); + if (lst->tail) + lst->tail->next = m; else - msg_list_head = ml; - msg_list_tail = ml; -} - -void send_msg(enum msgcode code, char *buf, int len) -{ - if (msg_fd_out < 0) { - io_multiplex_write(code, buf, len); - return; - } - msg_list_add(code, buf, len); - msg_list_push(NORMAL_FLUSH); + lst->head = m; + lst->tail = m; } /* Read a message from the MSG_* fd and handle it. This is called either @@ -226,7 +234,7 @@ static void read_msg_fd(void) int tag, len; /* Temporarily disable msg_fd_in. This is needed to avoid looping back - * to this routine from read_timeout() and writefd_unbuffered(). */ + * to this routine from writefd_unbuffered(). */ msg_fd_in = -1; read_loop(fd, buf, 4); @@ -241,7 +249,7 @@ static void read_msg_fd(void) rprintf(FERROR, "invalid message %d:%d\n", tag, len); exit_cleanup(RERR_STREAMIO); } - redo_list_add(-1); + flist_ndx_push(&redo_list, -1); break; case MSG_REDO: if (len != 4 || !am_generator) { @@ -249,7 +257,9 @@ static void read_msg_fd(void) exit_cleanup(RERR_STREAMIO); } read_loop(fd, buf, 4); - redo_list_add(IVAL(buf,0)); + if (remove_source_files) + decrement_active_files(IVAL(buf,0)); + flist_ndx_push(&redo_list, IVAL(buf,0)); break; case MSG_DELETED: if (len >= (int)sizeof buf || !am_generator) { @@ -257,7 +267,7 @@ static void read_msg_fd(void) exit_cleanup(RERR_STREAMIO); } read_loop(fd, buf, len); - io_multiplex_write(MSG_DELETED, buf, len); + send_msg(MSG_DELETED, buf, len); break; case MSG_SUCCESS: if (len != 4 || !am_generator) { @@ -265,8 +275,20 @@ static void read_msg_fd(void) exit_cleanup(RERR_STREAMIO); } read_loop(fd, buf, len); - io_multiplex_write(MSG_SUCCESS, buf, len); + if (remove_source_files) { + decrement_active_files(IVAL(buf,0)); + send_msg(MSG_SUCCESS, buf, len); + } + if (preserve_hard_links) + flist_ndx_push(&hlink_list, IVAL(buf,0)); break; + case MSG_SOCKERR: + if (!am_generator) { + rprintf(FERROR, "invalid message %d:%d\n", tag, len); + exit_cleanup(RERR_STREAMIO); + } + close_multiplexing_out(); + /* FALL THROUGH */ case MSG_INFO: case MSG_ERROR: case MSG_LOG: @@ -275,22 +297,45 @@ static void read_msg_fd(void) if (n >= sizeof buf) n = sizeof buf - 1; read_loop(fd, buf, n); - rwrite((enum logcode)tag, buf, n); + rwrite(tag, buf, n); len -= n; } break; default: - rprintf(FERROR, "unknown message %d:%d\n", tag, len); + rprintf(FERROR, "unknown message %d:%d [%s]\n", + tag, len, who_am_i()); exit_cleanup(RERR_STREAMIO); } msg_fd_in = fd; } +/* 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) +{ + /* TODO: tune these limits? */ + while (active_filecnt >= (active_bytecnt >= 128*1024 ? 10 : 50)) { + if (hlink_list.head) + check_for_finished_hlinks(itemizing, code); + read_msg_fd(); + } + + active_filecnt++; + active_bytecnt += the_file_list->files[ndx]->length; +} + +void decrement_active_files(int ndx) +{ + active_filecnt--; + active_bytecnt -= the_file_list->files[ndx]->length; +} + /* Try to push messages off the list onto the wire. If we leave with more * to do, return 0. On error, return -1. If everything flushed, return 1. * This is only active in the receiver. */ -int msg_list_push(int flush_it_all) +static int msg2genr_flush(int flush_it_all) { static int written = 0; struct timeval tv; @@ -299,9 +344,9 @@ int msg_list_push(int flush_it_all) if (msg_fd_out < 0) return -1; - while (msg_list_head) { - struct msg_list *ml = msg_list_head; - int n = write(msg_fd_out, ml->buf + written, ml->len - written); + while (msg2genr.head) { + struct msg_list_item *m = msg2genr.head; + int n = write(msg_fd_out, m->buf + written, m->len - written); if (n < 0) { if (errno == EINTR) continue; @@ -315,34 +360,48 @@ int msg_list_push(int flush_it_all) tv.tv_usec = 0; if (!select(msg_fd_out+1, NULL, &fds, NULL, &tv)) check_timeout(); - } else if ((written += n) == ml->len) { - free(ml->buf); - msg_list_head = ml->next; - if (!msg_list_head) - msg_list_tail = NULL; - free(ml); + } else if ((written += n) == m->len) { + msg2genr.head = m->next; + if (!msg2genr.head) + msg2genr.tail = NULL; + free(m); written = 0; } } return 1; } -int get_redo_num(void) +int send_msg(enum msgcode code, const char *buf, int len) { - struct redo_list *next; - int num; + if (msg_fd_out < 0) { + if (!defer_forwarding_messages) + return io_multiplex_write(code, buf, len); + if (!io_multiplexing_out) + return 0; + msg_list_add(&msg2sndr, code, buf, len); + return 1; + } + msg_list_add(&msg2genr, code, buf, len); + msg2genr_flush(NORMAL_FLUSH); + return 1; +} - while (!redo_list_head) +int get_redo_num(int itemizing, enum logcode code) +{ + while (1) { + if (hlink_list.head) + check_for_finished_hlinks(itemizing, code); + if (redo_list.head) + break; read_msg_fd(); + } - num = redo_list_head->num; - next = redo_list_head->next; - free(redo_list_head); - redo_list_head = next; - if (!next) - redo_list_tail = NULL; + return flist_ndx_pop(&redo_list); +} - return num; +int get_hlink_num(void) +{ + return flist_ndx_pop(&hlink_list); } /** @@ -364,22 +423,26 @@ void io_set_filesfrom_fds(int f_in, int f_out) io_filesfrom_buflen = 0; } -/** - * It's almost always an error to get an EOF when we're trying to read - * from the network, because the protocol is self-terminating. +/* 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. * - * However, there is one unfortunate cases where it is not, which is - * rsync <2.4.6 sending a list of modules on a server, since the list - * is terminated by closing the socket. So, for the section of the - * program where that is a problem (start_socket_client), - * kluge_around_eof is True and we just exit. - */ + * 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); - while (1) + /* If we're still here after 10 seconds, exit with an error. */ + for (i = 10*1000/20; i--; ) msleep(20); } @@ -390,7 +453,6 @@ static void whine_about_eof(int fd) 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. @@ -404,11 +466,11 @@ static void whine_about_eof(int fd) */ static int read_timeout(int fd, char *buf, size_t len) { - int n, ret = 0; + int n, cnt = 0; io_flush(NORMAL_FLUSH); - while (ret == 0) { + while (cnt == 0) { /* until we manage to read *something* */ fd_set r_fds, w_fds; struct timeval tv; @@ -418,11 +480,7 @@ static int read_timeout(int fd, char *buf, size_t len) FD_ZERO(&r_fds); FD_ZERO(&w_fds); FD_SET(fd, &r_fds); - if (msg_fd_in >= 0) { - FD_SET(msg_fd_in, &r_fds); - if (msg_fd_in > maxfd) - maxfd = msg_fd_in; - } else if (msg_list_head) { + if (msg2genr.head) { FD_SET(msg_fd_out, &w_fds); if (msg_fd_out > maxfd) maxfd = msg_fd_out; @@ -459,10 +517,8 @@ static int read_timeout(int fd, char *buf, size_t len) continue; } - if (msg_fd_in >= 0 && FD_ISSET(msg_fd_in, &r_fds)) - read_msg_fd(); - else if (msg_list_head && FD_ISSET(msg_fd_out, &w_fds)) - msg_list_push(NORMAL_FLUSH); + if (msg2genr.head && FD_ISSET(msg_fd_out, &w_fds)) + msg2genr_flush(NORMAL_FLUSH); if (io_filesfrom_f_out >= 0) { if (io_filesfrom_buflen) { @@ -540,21 +596,23 @@ static int read_timeout(int fd, char *buf, size_t len) continue; /* Don't write errors on a dead socket. */ - if (fd == sock_f_in) + if (fd == sock_f_in) { close_multiplexing_out(); - rsyserr(FERROR, errno, "read error"); + rsyserr(FSOCKERR, errno, "read error"); + } else + rsyserr(FERROR, errno, "read error"); exit_cleanup(RERR_STREAMIO); } buf += n; len -= n; - ret += n; + cnt += n; - if (io_timeout && fd == sock_f_in) - last_io = time(NULL); + if (fd == sock_f_in && io_timeout) + last_io_in = time(NULL); } - return ret; + return cnt; } /** @@ -565,7 +623,7 @@ int read_filesfrom_line(int fd, char *fname) { char ch, *s, *eob = fname + MAXPATHLEN - 1; int cnt; - int reading_remotely = remote_filesfrom_file != NULL; + int reading_remotely = filesfrom_host != NULL; int nulls = eol_nulls || reading_remotely; start: @@ -575,13 +633,19 @@ int read_filesfrom_line(int fd, char *fname) if (cnt < 0 && (errno == EWOULDBLOCK || errno == EINTR || errno == EAGAIN)) { struct timeval tv; - fd_set fds; - FD_ZERO(&fds); - FD_SET(fd, &fds); + 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, &fds, NULL, NULL, &tv)) + if (!select(fd+1, &r_fds, NULL, &e_fds, &tv)) check_timeout(); + if (FD_ISSET(fd, &e_fds)) { + rsyserr(FINFO, errno, + "select exception on fd %d", fd); + } continue; } if (cnt != 1) @@ -604,7 +668,6 @@ int read_filesfrom_line(int fd, char *fname) return s - fname; } - static char *iobuf_out; static int iobuf_out_cnt; @@ -617,7 +680,6 @@ void io_start_buffering_out(void) iobuf_out_cnt = 0; } - static char *iobuf_in; static size_t iobuf_in_siz; @@ -630,7 +692,6 @@ void io_start_buffering_in(void) out_of_memory("io_start_buffering_in"); } - void io_end_buffering(void) { io_flush(NORMAL_FLUSH); @@ -640,14 +701,19 @@ void io_end_buffering(void) } } +void maybe_flush_socket(void) +{ + if (iobuf_out && iobuf_out_cnt && time(NULL) - last_io_out >= 5) + io_flush(NORMAL_FLUSH); +} -void maybe_send_keepalive(int allowed_lull, int ndx) +void maybe_send_keepalive(void) { - if (time(NULL) - last_io >= allowed_lull) { + if (time(NULL) - last_io_out >= allowed_lull) { if (!iobuf_out || !iobuf_out_cnt) { if (protocol_version < 29) return; /* there's nothing we can do */ - write_int(sock_f_out, ndx); + write_int(sock_f_out, the_file_list->count); write_shortint(sock_f_out, ITEM_IS_NEW); } if (iobuf_out) @@ -655,7 +721,6 @@ void maybe_send_keepalive(int allowed_lull, int ndx) } } - /** * Continue trying to read len bytes - don't return until len has been * read. @@ -670,7 +735,6 @@ static void read_loop(int fd, char *buf, size_t len) } } - /** * Read from the file descriptor handling multiplexing - return number * of bytes read. @@ -681,8 +745,9 @@ static int readfd_unbuffered(int fd, char *buf, size_t len) { static size_t remaining; static size_t iobuf_in_ndx; - int tag, ret = 0; - char line[MAXPATHLEN+1]; + size_t msg_bytes; + int tag, cnt = 0; + char line[BIGPATHBUFLEN]; if (!iobuf_in || fd != sock_f_in) return read_timeout(fd, buf, len); @@ -692,73 +757,70 @@ static int readfd_unbuffered(int fd, char *buf, size_t len) iobuf_in_ndx = 0; } - while (ret == 0) { + while (cnt == 0) { if (remaining) { len = MIN(len, remaining); memcpy(buf, iobuf_in + iobuf_in_ndx, len); iobuf_in_ndx += len; remaining -= len; - ret = len; + cnt = len; break; } read_loop(fd, line, 4); tag = IVAL(line, 0); - remaining = tag & 0xFFFFFF; + msg_bytes = tag & 0xFFFFFF; tag = (tag >> 24) - MPLEX_BASE; switch (tag) { case MSG_DATA: - if (remaining > iobuf_in_siz) { + if (msg_bytes > iobuf_in_siz) { if (!(iobuf_in = realloc_array(iobuf_in, char, - remaining))) + msg_bytes))) out_of_memory("readfd_unbuffered"); - iobuf_in_siz = remaining; + iobuf_in_siz = msg_bytes; } - read_loop(fd, iobuf_in, remaining); + read_loop(fd, iobuf_in, msg_bytes); + remaining = msg_bytes; iobuf_in_ndx = 0; break; case MSG_DELETED: - if (remaining >= sizeof line) { - rprintf(FERROR, "invalid multi-message %d:%ld\n", - tag, (long)remaining); - exit_cleanup(RERR_STREAMIO); - } - read_loop(fd, line, remaining); - line[remaining] = '\0'; + if (msg_bytes >= sizeof line) + goto overflow; + read_loop(fd, line, msg_bytes); /* A directory name was sent with the trailing null */ - if (remaining > 0 && !line[remaining-1]) + if (msg_bytes > 0 && !line[msg_bytes-1]) log_delete(line, S_IFDIR); - else + else { + line[msg_bytes] = '\0'; log_delete(line, S_IFREG); - remaining = 0; + } break; case MSG_SUCCESS: - if (remaining != 4) { - rprintf(FERROR, "invalid multi-message %d:%ld\n", - tag, (long)remaining); + if (msg_bytes != 4) { + rprintf(FERROR, "invalid multi-message %d:%ld [%s]\n", + tag, (long)msg_bytes, who_am_i()); exit_cleanup(RERR_STREAMIO); } - read_loop(fd, line, remaining); + read_loop(fd, line, msg_bytes); successful_send(IVAL(line, 0)); - remaining = 0; break; case MSG_INFO: case MSG_ERROR: - if (remaining >= sizeof line) { + if (msg_bytes >= sizeof line) { + overflow: rprintf(FERROR, - "[%s] multiplexing overflow %d:%ld\n\n", - who_am_i(), tag, (long)remaining); + "multiplexing overflow %d:%ld [%s]\n", + tag, (long)msg_bytes, who_am_i()); exit_cleanup(RERR_STREAMIO); } - read_loop(fd, line, remaining); - rwrite((enum logcode)tag, line, remaining); - remaining = 0; + read_loop(fd, line, msg_bytes); + rwrite((enum logcode)tag, line, msg_bytes); break; default: - rprintf(FERROR, "[%s] unexpected tag %d\n", - who_am_i(), tag); + rprintf(FERROR, "unexpected tag %d [%s]\n", + tag, who_am_i()); exit_cleanup(RERR_STREAMIO); } } @@ -766,11 +828,9 @@ static int readfd_unbuffered(int fd, char *buf, size_t len) if (remaining == 0) io_flush(NORMAL_FLUSH); - return ret; + return cnt; } - - /** * Do a buffered read from @p fd. Don't return until all @p n bytes * have been read. If all @p n can't be read then exit with an @@ -778,12 +838,12 @@ static int readfd_unbuffered(int fd, char *buf, size_t len) **/ static void readfd(int fd, char *buffer, size_t N) { - int ret; + int cnt; size_t total = 0; while (total < N) { - ret = readfd_unbuffered(fd, buffer + total, N-total); - total += ret; + cnt = readfd_unbuffered(fd, buffer + total, N-total); + total += cnt; } if (fd == write_batch_monitor_in) { @@ -795,7 +855,6 @@ static void readfd(int fd, char *buffer, size_t N) stats.total_read += total; } - int read_shortint(int f) { uchar b[2]; @@ -803,48 +862,47 @@ int read_shortint(int f) return (b[1] << 8) + b[0]; } - int32 read_int(int f) { char b[4]; - int32 ret; + int32 num; readfd(f,b,4); - ret = IVAL(b,0); - if (ret == (int32)0xffffffff) + num = IVAL(b,0); + if (num == (int32)0xffffffff) return -1; - return ret; + return num; } int64 read_longint(int f) { - int64 ret; + int64 num; char b[8]; - ret = read_int(f); + num = read_int(f); - if ((int32)ret != (int32)0xffffffff) - return ret; + if ((int32)num != (int32)0xffffffff) + return num; #if SIZEOF_INT64 < 8 rprintf(FERROR, "Integer overflow: attempted 64-bit offset\n"); exit_cleanup(RERR_UNSUPPORTED); #else readfd(f,b,8); - ret = IVAL(b,0) | (((int64)IVAL(b,4))<<32); + num = IVAL(b,0) | (((int64)IVAL(b,4))<<32); #endif - return ret; + return num; } -void read_buf(int f,char *buf,size_t len) +void read_buf(int f, char *buf, size_t len) { readfd(f,buf,len); } -void read_sbuf(int f,char *buf,size_t len) +void read_sbuf(int f, char *buf, size_t len) { readfd(f, buf, len); - buf[len] = 0; + buf[len] = '\0'; } uchar read_byte(int f) @@ -854,27 +912,51 @@ uchar read_byte(int f) return c; } +int read_vstring(int f, char *buf, int bufsize) +{ + int len = read_byte(f); + + if (len & 0x80) + len = (len & ~0x80) * 0x100 + read_byte(f); + + if (len >= bufsize) { + rprintf(FERROR, "over-long vstring received (%d > %d)\n", + len, bufsize - 1); + return -1; + } + + if (len) + readfd(f, buf, len); + buf[len] = '\0'; + return len; +} + /* Populate a sum_struct with values from the socket. This is * called by both the sender and the receiver. */ void read_sum_head(int f, struct sum_struct *sum) { sum->count = read_int(f); + if (sum->count < 0) { + rprintf(FERROR, "Invalid checksum count %ld [%s]\n", + (long)sum->count, who_am_i()); + exit_cleanup(RERR_PROTOCOL); + } sum->blength = read_int(f); if (sum->blength < 0 || sum->blength > MAX_BLOCK_SIZE) { - rprintf(FERROR, "[%s] Invalid block length %ld\n", - who_am_i(), (long)sum->blength); + rprintf(FERROR, "Invalid block length %ld [%s]\n", + (long)sum->blength, who_am_i()); exit_cleanup(RERR_PROTOCOL); } sum->s2length = protocol_version < 27 ? csum_length : (int)read_int(f); if (sum->s2length < 0 || sum->s2length > MD4_SUM_LENGTH) { - rprintf(FERROR, "[%s] Invalid checksum length %d\n", - who_am_i(), sum->s2length); + rprintf(FERROR, "Invalid checksum length %d [%s]\n", + sum->s2length, who_am_i()); exit_cleanup(RERR_PROTOCOL); } sum->remainder = read_int(f); if (sum->remainder < 0 || sum->remainder > sum->blength) { - rprintf(FERROR, "[%s] Invalid remainder length %ld\n", - who_am_i(), (long)sum->remainder); + rprintf(FERROR, "Invalid remainder length %ld [%s]\n", + (long)sum->remainder, who_am_i()); exit_cleanup(RERR_PROTOCOL); } } @@ -896,7 +978,6 @@ void write_sum_head(int f, struct sum_struct *sum) write_int(f, sum->remainder); } - /** * Sleep after writing to limit I/O bandwidth usage. * @@ -916,16 +997,16 @@ void write_sum_head(int f, struct sum_struct *sum) static void sleep_for_bwlimit(int bytes_written) { static struct timeval prior_tv; - static long total_written = 0; + static long total_written = 0; struct timeval tv, start_tv; long elapsed_usec, sleep_usec; #define ONE_SEC 1000000L /* # of microseconds in a second */ - if (!bwlimit) + if (!bwlimit_writemax) return; - total_written += bytes_written; + total_written += bytes_written; gettimeofday(&start_tv, NULL); if (prior_tv.tv_sec) { @@ -952,45 +1033,44 @@ static void sleep_for_bwlimit(int bytes_written) total_written = (sleep_usec - elapsed_usec) * bwlimit / (ONE_SEC/1024); } - /* Write len bytes to the file descriptor fd, looping as necessary to get - * the job done and also (in the generator) reading any data on msg_fd_in - * (to avoid deadlock). + * the job done and also (in certain circumstances) reading any data on + * msg_fd_in to avoid deadlock. * * This function underlies the multiplexing system. The body of the * application never calls this function directly. */ -static void writefd_unbuffered(int fd,char *buf,size_t len) +static void writefd_unbuffered(int fd, const char *buf, size_t len) { size_t n, total = 0; - fd_set w_fds, r_fds; - int maxfd, count, ret; + fd_set w_fds, r_fds, e_fds; + int maxfd, count, cnt, using_r_fds; + int defer_save = defer_forwarding_messages; struct timeval tv; no_flush++; while (total < len) { FD_ZERO(&w_fds); - FD_SET(fd,&w_fds); + FD_SET(fd, &w_fds); + FD_ZERO(&e_fds); + FD_SET(fd, &e_fds); maxfd = fd; if (msg_fd_in >= 0) { FD_ZERO(&r_fds); - FD_SET(msg_fd_in,&r_fds); + FD_SET(msg_fd_in, &r_fds); if (msg_fd_in > maxfd) maxfd = msg_fd_in; - } - if (fd != sock_f_out && iobuf_out_cnt && no_flush == 1) { - FD_SET(sock_f_out, &w_fds); - if (sock_f_out > maxfd) - maxfd = sock_f_out; - } + using_r_fds = 1; + } else + using_r_fds = 0; tv.tv_sec = select_timeout; tv.tv_usec = 0; errno = 0; - count = select(maxfd + 1, msg_fd_in >= 0 ? &r_fds : NULL, - &w_fds, NULL, &tv); + count = select(maxfd + 1, using_r_fds ? &r_fds : NULL, + &w_fds, &e_fds, &tv); if (count <= 0) { if (count < 0 && errno == EBADF) @@ -999,25 +1079,24 @@ static void writefd_unbuffered(int fd,char *buf,size_t len) continue; } - if (msg_fd_in >= 0 && FD_ISSET(msg_fd_in, &r_fds)) + if (FD_ISSET(fd, &e_fds)) { + rsyserr(FINFO, errno, + "select exception on fd %d", fd); + } + + if (using_r_fds && FD_ISSET(msg_fd_in, &r_fds)) read_msg_fd(); - if (!FD_ISSET(fd, &w_fds)) { - if (fd != sock_f_out && iobuf_out_cnt) { - no_flush--; - io_flush(NORMAL_FLUSH); - no_flush++; - } + if (!FD_ISSET(fd, &w_fds)) continue; - } n = len - total; - if (bwlimit && n > bwlimit_writemax) + if (bwlimit_writemax && n > bwlimit_writemax) n = bwlimit_writemax; - ret = write(fd, buf + total, n); + cnt = write(fd, buf + total, n); - if (ret <= 0) { - if (ret < 0) { + if (cnt <= 0) { + if (cnt < 0) { if (errno == EINTR) continue; if (errno == EWOULDBLOCK || errno == EAGAIN) { @@ -1030,12 +1109,12 @@ static void writefd_unbuffered(int fd,char *buf,size_t len) if (fd == sock_f_out) close_multiplexing_out(); rsyserr(FERROR, errno, - "writefd_unbuffered failed to write %ld bytes: phase \"%s\" [%s]", - (long)len, io_write_phase, who_am_i()); + "writefd_unbuffered failed to write %ld bytes [%s]", + (long)len, who_am_i()); /* If the other side is sending us error messages, try * to grab any messages they sent before they died. */ while (fd == sock_f_out && io_multiplexing_in) { - io_timeout = select_timeout = 30; + set_io_timeout(30); ignore_timeout = 0; readfd_unbuffered(sock_f_in, io_filesfrom_buf, sizeof io_filesfrom_buf); @@ -1043,47 +1122,70 @@ static void writefd_unbuffered(int fd,char *buf,size_t len) exit_cleanup(RERR_STREAMIO); } - total += ret; + total += cnt; + defer_forwarding_messages = 1; if (fd == sock_f_out) { - if (io_timeout) - last_io = time(NULL); - sleep_for_bwlimit(ret); + if (io_timeout || am_generator) + last_io_out = time(NULL); + sleep_for_bwlimit(cnt); } } + defer_forwarding_messages = defer_save; no_flush--; } +static void msg2sndr_flush(void) +{ + if (defer_forwarding_messages) + return; + + while (msg2sndr.head && io_multiplexing_out) { + struct msg_list_item *m = msg2sndr.head; + if (!(msg2sndr.head = m->next)) + msg2sndr.tail = NULL; + stats.total_written += m->len; + defer_forwarding_messages = 1; + writefd_unbuffered(sock_f_out, m->buf, m->len); + defer_forwarding_messages = 0; + free(m); + } +} /** * Write an message to a multiplexed stream. If this fails then rsync * exits. **/ -static void mplex_write(enum msgcode code, char *buf, size_t len) +static void mplex_write(enum msgcode code, const char *buf, size_t len) { - char buffer[4096]; + char buffer[1024]; size_t n = len; SIVAL(buffer, 0, ((MPLEX_BASE + (int)code)<<24) + len); if (n > sizeof buffer - 4) - n = sizeof buffer - 4; + n = 0; + else + memcpy(buffer + 4, buf, n); - memcpy(&buffer[4], buf, n); writefd_unbuffered(sock_f_out, buffer, n+4); len -= n; buf += n; - if (len) + if (len) { + defer_forwarding_messages = 1; writefd_unbuffered(sock_f_out, buf, len); + defer_forwarding_messages = 0; + msg2sndr_flush(); + } } - void io_flush(int flush_it_all) { - msg_list_push(flush_it_all); + msg2genr_flush(flush_it_all); + msg2sndr_flush(); if (!iobuf_out_cnt || no_flush) return; @@ -1095,8 +1197,7 @@ void io_flush(int flush_it_all) iobuf_out_cnt = 0; } - -static void writefd(int fd,char *buf,size_t len) +static void writefd(int fd, const char *buf, size_t len) { if (fd == msg_fd_out) { rprintf(FERROR, "Internal error: wrong write used in receiver.\n"); @@ -1130,7 +1231,6 @@ static void writefd(int fd,char *buf,size_t len) } } - void write_shortint(int f, int x) { uchar b[2]; @@ -1139,7 +1239,6 @@ void write_shortint(int f, int x) writefd(f, (char *)b, 2); } - void write_int(int f,int32 x) { char b[4]; @@ -1147,15 +1246,6 @@ void write_int(int f,int32 x) writefd(f,b,4); } - -void write_int_named(int f, int32 x, const char *phase) -{ - io_write_phase = phase; - write_int(f, x); - io_write_phase = phase_unknown; -} - - /* * Note: int64 may actually be a 32-bit type if ./configure couldn't find any * 64-bit types on this platform. @@ -1181,24 +1271,41 @@ void write_longint(int f, int64 x) #endif } -void write_buf(int f,char *buf,size_t len) +void write_buf(int f, const char *buf, size_t len) { writefd(f,buf,len); } - /** Write a string to the connection */ -void write_sbuf(int f, char *buf) +void write_sbuf(int f, const char *buf) { writefd(f, buf, strlen(buf)); } - void write_byte(int f, uchar c) { writefd(f, (char *)&c, 1); } +void write_vstring(int f, const char *str, int len) +{ + uchar lenbuf[3], *lb = lenbuf; + + if (len > 0x7F) { + if (len > 0x7FFF) { + rprintf(FERROR, + "attempting to send over-long vstring (%d > %d)\n", + len, 0x7FFF); + exit_cleanup(RERR_PROTOCOL); + } + *lb++ = len / 0x100 + 0x80; + } + *lb = len; + + writefd(f, (char*)lenbuf, lb - lenbuf + 1); + if (len) + writefd(f, str, len); +} /** * Read a line of up to @p maxlen characters into @p buf (not counting @@ -1225,11 +1332,10 @@ int read_line(int f, char *buf, size_t maxlen) return maxlen > 0; } - void io_printf(int fd, const char *format, ...) { va_list ap; - char buf[1024]; + char buf[BIGPATHBUFLEN]; int len; va_start(ap, format); @@ -1239,10 +1345,14 @@ void io_printf(int fd, const char *format, ...) if (len < 0) exit_cleanup(RERR_STREAMIO); + if (len > (int)sizeof buf) { + rprintf(FERROR, "io_printf() was too long for the buffer.\n"); + exit_cleanup(RERR_STREAMIO); + } + write_sbuf(fd, buf); } - /** Setup for multiplexing a MSG_* stream with the data stream. */ void io_start_multiplex_out(void) { @@ -1260,7 +1370,7 @@ void io_start_multiplex_in(void) } /** Write an message to the multiplexed data stream. */ -int io_multiplex_write(enum msgcode code, char *buf, size_t len) +int io_multiplex_write(enum msgcode code, const char *buf, size_t len) { if (!io_multiplexing_out) return 0;