X-Git-Url: https://mattmccutchen.net/rsync/rsync.git/blobdiff_plain/4cf64834ed182e6c10f2213f84d8d33a273b3896..fb4c98c2c8a618855ebe4d11c36f8a120fab2aa1:/util.c diff --git a/util.c b/util.c index 245f3b29..9b54c05a 100644 --- a/util.c +++ b/util.c @@ -19,19 +19,21 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ -/* - Utilities used in rsync +/** + * + * @file util.c + * + * Utilities used in rsync + **/ - tridge, June 1996 - */ #include "rsync.h" extern int verbose; -/**************************************************************************** -Set a fd into nonblocking mode -****************************************************************************/ +/** + Set a fd into nonblocking mode +**/ void set_nonblocking(int fd) { int val; @@ -44,9 +46,9 @@ void set_nonblocking(int fd) } } -/**************************************************************************** +/** Set a fd into blocking mode -****************************************************************************/ +*/ void set_blocking(int fd) { int val; @@ -60,10 +62,11 @@ void set_blocking(int fd) } -/* create a file descriptor pair - like pipe() but use socketpair if - possible (because of blocking issues on pipes) +/** + Create a file descriptor pair - like pipe() but use socketpair if + possible (because of blocking issues on pipes). - always set non-blocking + Always set non-blocking. */ int fd_pair(int fd[2]) { @@ -104,16 +107,19 @@ static void print_child_argv(char **cmd) } -/* this is derived from CVS code - - note that in the child STDIN is set to blocking and STDOUT - is set to non-blocking. This is necessary as rsh relies on stdin being blocking - and ssh relies on stdout being non-blocking - - if blocking_io is set then use blocking io on both fds. That can be - used to cope with badly broken rsh implementations like the one on - solaris. - */ +/** + * Create a child connected to use on stdin/stdout. + * + * This is derived from CVS code + * + * Note that in the child STDIN is set to blocking and STDOUT + * is set to non-blocking. This is necessary as rsh relies on stdin being blocking + * and ssh relies on stdout being non-blocking + * + * If blocking_io is set then use blocking io on both fds. That can be + * used to cope with badly broken rsh implementations like the one on + * Solaris. + **/ pid_t piped_child(char **command, int *f_in, int *f_out) { pid_t pid; @@ -173,7 +179,8 @@ pid_t piped_child(char **command, int *f_in, int *f_out) return pid; } -pid_t local_child(int argc, char **argv,int *f_in,int *f_out) +pid_t local_child(int argc, char **argv,int *f_in,int *f_out, + int (*child_main)(int, char **)) { pid_t pid; int to_child_pipe[2]; @@ -209,7 +216,7 @@ pid_t local_child(int argc, char **argv,int *f_in,int *f_out) } if (to_child_pipe[0] != STDIN_FILENO) close(to_child_pipe[0]); if (from_child_pipe[1] != STDOUT_FILENO) close(from_child_pipe[1]); - start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv); + child_main(argc, argv); } if (close(from_child_pipe[1]) < 0 || @@ -275,11 +282,11 @@ int set_modtime(char *fname, time_t modtime) } -/**************************************************************************** -create any necessary directories in fname. Unfortunately we don't know -what perms to give the directory when this is called so we need to rely -on the umask -****************************************************************************/ +/** + Create any necessary directories in fname. Unfortunately we don't know + what perms to give the directory when this is called so we need to rely + on the umask +**/ int create_directory_path(char *fname) { extern int orig_umask; @@ -299,11 +306,16 @@ int create_directory_path(char *fname) } -/* Write LEN bytes at PTR to descriptor DESC, retrying if interrupted. - Return LEN upon success, write's (negative) error code otherwise. - - derived from GNU C's cccp.c. -*/ +/** + * Write @p len bytes at @p ptr to descriptor @p desc, retrying if + * interrupted. + * + * @retval len upon success + * + * @retval <0 write's (negative) error code + * + * Derived from GNU C's cccp.c. + */ static int full_write(int desc, char *ptr, size_t len) { int total_written; @@ -325,11 +337,18 @@ static int full_write(int desc, char *ptr, size_t len) return total_written; } -/* Read LEN bytes at PTR from descriptor DESC, retrying if interrupted. - Return the actual number of bytes read, zero for EOF, or negative - for an error. - derived from GNU C's cccp.c. */ +/** + * Read @p len bytes at @p ptr from descriptor @p desc, retrying if + * interrupted. + * + * @retval >0 the actual number of bytes read + * + * @retval 0 for EOF + * + * @retval <0 for an error. + * + * Derived from GNU C's cccp.c. */ static int safe_read(int desc, char *ptr, size_t len) { int n_chars; @@ -349,7 +368,9 @@ static int safe_read(int desc, char *ptr, size_t len) } -/* copy a file - this is used in conjunction with the --temp-dir option */ +/** Copy a file. + * + * This is used in conjunction with the --temp-dir option */ int copy_file(char *source, char *dest, mode_t mode) { int ifd; @@ -400,18 +421,21 @@ int copy_file(char *source, char *dest, mode_t mode) return 0; } -/* - Robust unlink: some OS'es (HPUX) refuse to unlink busy files, so - rename to /.rsyncNNN instead. Note that successive rsync runs - will shuffle the filenames around a bit as long as the file is still - busy; this is because this function does not know if the unlink call - is due to a new file coming in, or --delete trying to remove old - .rsyncNNN files, hence it renames it each time. -*/ /* MAX_RENAMES should be 10**MAX_RENAMES_DIGITS */ #define MAX_RENAMES_DIGITS 3 #define MAX_RENAMES 1000 +/** + * + Robust unlink: some OS'es (HPUX) refuse to unlink busy files, so + rename to /.rsyncNNN instead. + + Note that successive rsync runs will shuffle the filenames around a + bit as long as the file is still busy; this is because this function + does not know if the unlink call is due to a new file coming in, or + --delete trying to remove old .rsyncNNN files, hence it renames it + each time. +*/ int robust_unlink(char *fname) { #ifndef ETXTBSY @@ -519,7 +543,7 @@ void kill_all(int sig) } -/* turn a user name into a uid */ +/** Turn a user name into a uid */ int name_to_uid(char *name, uid_t *uid) { struct passwd *pass; @@ -532,7 +556,7 @@ int name_to_uid(char *name, uid_t *uid) return 0; } -/* turn a group name into a gid */ +/** Turn a group name into a gid */ int name_to_gid(char *name, gid_t *gid) { struct group *grp; @@ -546,7 +570,7 @@ int name_to_gid(char *name, gid_t *gid) } -/* lock a byte range in a open file */ +/** Lock a byte range in a open file */ int lock_range(int fd, int offset, int len) { struct flock lock; @@ -628,9 +652,9 @@ void glob_expand(char *base1, char **argv, int *argc, int maxargs) free(base); } -/******************************************************************* - convert a string to lower case -********************************************************************/ +/** + * Convert a string to lower case + **/ void strlower(char *s) { while (*s) { @@ -688,15 +712,19 @@ void clean_fname(char *name) } } -/* +/** * Make path appear as if a chroot had occurred: + * * 1. remove leading "/" (or replace with "." if at end) * 2. remove leading ".." components (except those allowed by "reldir") * 3. delete any other "/.." (recursively) + * * Can only shrink paths, so sanitizes in place. + * * While we're at it, remove double slashes and "." components like * clean_fname does(), but DON'T remove a trailing slash because that * is sometimes significant on command line arguments. + * * If "reldir" is non-null, it is a sanitized directory that the path will be * relative to, so allow as many ".." at the beginning of the path as * there are components in reldir. This is used for symbolic link targets. @@ -705,9 +733,9 @@ void clean_fname(char *name) * path, but that would blow the assumption that the path doesn't grow and * it is not likely to end up being a valid symlink anyway, so just do * the normal removal of the leading "/" instead. + * * Contributed by Dave Dykstra */ - void sanitize_path(char *p, char *reldir) { char *start, *sanp; @@ -796,7 +824,7 @@ void sanitize_path(char *p, char *reldir) static char curr_dir[MAXPATHLEN]; -/* like chdir() but can be reversed with pop_dir() if save is set. It +/** like chdir() but can be reversed with pop_dir() if save is set. It is also much faster as it remembers where we have been */ char *push_dir(char *dir, int save) { @@ -828,7 +856,7 @@ char *push_dir(char *dir, int save) return ret; } -/* reverse a push_dir call */ +/** Reverse a push_dir call */ int pop_dir(char *dir) { int ret; @@ -846,7 +874,7 @@ int pop_dir(char *dir) return 0; } -/* we need to supply our own strcmp function for file list comparisons +/** We need to supply our own strcmp function for file list comparisons to ensure that signed/unsigned usage is consistent between machines. */ int u_strcmp(const char *cs1, const char *cs2) { @@ -955,7 +983,22 @@ void show_progress(OFF_T ofs, OFF_T size) } } -/* determine if a symlink points outside the current directory tree */ + +/** + * Determine if a symlink points outside the current directory tree. + * This is considered "unsafe" because e.g. when mirroring somebody + * else's machine it might allow them to establish a symlink to + * /etc/passwd, and then read it through a web server. + * + * @param dest Target of the symlink in question. + * + * @param src Top source directory currently applicable. Basically this + * is the first parameter to rsync in a simple invocation, but it's + * modified by flist.c in slightly complex ways. + * + * @retval True if unsafe + * @retval False is unsafe + **/ int unsafe_symlink(char *dest, char *src) { char *tok; @@ -1003,9 +1046,9 @@ int unsafe_symlink(char *dest, char *src) } -/**************************************************************************** - return the date and time as a string -****************************************************************************/ +/** + Return the date and time as a string +*/ char *timestring(time_t t) { static char TimeBuf[200]; @@ -1055,12 +1098,17 @@ int msleep(int t) } -/******************************************************************* - Determine if two file modification times are equivalent (either exact - or in the modification timestamp window established by --modify-window) - Returns 0 if the times should be treated as the same, 1 if the - first is later and -1 if the 2nd is later - *******************************************************************/ +/** + * Determine if two file modification times are equivalent (either + * exact or in the modification timestamp window established by + * --modify-window). + * + * @retval 0 if the times should be treated as the same + * + * @retval +1 if the first is later + * + * @retval -1 if the 2nd is later + **/ int cmp_modtime(time_t file1, time_t file2) { extern int modify_window; @@ -1077,11 +1125,11 @@ int cmp_modtime(time_t file1, time_t file2) #ifdef __INSURE__XX #include -/******************************************************************* -This routine is a trick to immediately catch errors when debugging -with insure. A xterm with a gdb is popped up when insure catches -a error. It is Linux specific. -********************************************************************/ +/** + This routine is a trick to immediately catch errors when debugging + with insure. A xterm with a gdb is popped up when insure catches + a error. It is Linux specific. +**/ int _Insure_trap_error(int a1, int a2, int a3, int a4, int a5, int a6) { static int (*fn)();