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function old new delta xvfork_parent_waits_and_exits - 64 +64 exec_prog_or_SHELL - 39 +39 unshare_main 873 810 -63 nsenter_main 663 596 -67 ------------------------------------------------------------------------------ (add/remove: 2/0 grow/shrink: 0/2 up/down: 106/-130) Total: -27 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
678 lines
16 KiB
C
678 lines
16 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Utility routines.
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*
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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* Copyright (C) 2006 Rob Landley
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* Copyright (C) 2006 Denys Vlasenko
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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/* We need to have separate xfuncs.c and xfuncs_printf.c because
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* with current linkers, even with section garbage collection,
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* if *.o module references any of XXXprintf functions, you pull in
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* entire printf machinery. Even if you do not use the function
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* which uses XXXprintf.
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*
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* xfuncs.c contains functions (not necessarily xfuncs)
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* which do not pull in printf, directly or indirectly.
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* xfunc_printf.c contains those which do.
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*/
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#include "libbb.h"
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/* All the functions starting with "x" call bb_error_msg_and_die() if they
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* fail, so callers never need to check for errors. If it returned, it
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* succeeded. */
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#ifndef DMALLOC
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/* dmalloc provides variants of these that do abort() on failure.
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* Since dmalloc's prototypes overwrite the impls here as they are
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* included after these prototypes in libbb.h, all is well.
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*/
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// Warn if we can't allocate size bytes of memory.
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void* FAST_FUNC malloc_or_warn(size_t size)
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{
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void *ptr = malloc(size);
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if (ptr == NULL && size != 0)
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bb_error_msg(bb_msg_memory_exhausted);
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return ptr;
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}
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// Die if we can't allocate size bytes of memory.
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void* FAST_FUNC xmalloc(size_t size)
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{
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void *ptr = malloc(size);
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if (ptr == NULL && size != 0)
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bb_error_msg_and_die(bb_msg_memory_exhausted);
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return ptr;
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}
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// Die if we can't resize previously allocated memory. (This returns a pointer
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// to the new memory, which may or may not be the same as the old memory.
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// It'll copy the contents to a new chunk and free the old one if necessary.)
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void* FAST_FUNC xrealloc(void *ptr, size_t size)
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{
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ptr = realloc(ptr, size);
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if (ptr == NULL && size != 0)
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bb_error_msg_and_die(bb_msg_memory_exhausted);
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return ptr;
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}
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#endif /* DMALLOC */
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// Die if we can't allocate and zero size bytes of memory.
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void* FAST_FUNC xzalloc(size_t size)
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{
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void *ptr = xmalloc(size);
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memset(ptr, 0, size);
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return ptr;
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}
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// Die if we can't copy a string to freshly allocated memory.
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char* FAST_FUNC xstrdup(const char *s)
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{
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char *t;
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if (s == NULL)
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return NULL;
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t = strdup(s);
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if (t == NULL)
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bb_error_msg_and_die(bb_msg_memory_exhausted);
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return t;
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}
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// Die if we can't allocate n+1 bytes (space for the null terminator) and copy
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// the (possibly truncated to length n) string into it.
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char* FAST_FUNC xstrndup(const char *s, int n)
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{
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int m;
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char *t;
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if (ENABLE_DEBUG && s == NULL)
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bb_error_msg_and_die("xstrndup bug");
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/* We can just xmalloc(n+1) and strncpy into it, */
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/* but think about xstrndup("abc", 10000) wastage! */
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m = n;
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t = (char*) s;
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while (m) {
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if (!*t) break;
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m--;
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t++;
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}
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n -= m;
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t = xmalloc(n + 1);
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t[n] = '\0';
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return memcpy(t, s, n);
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}
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void* FAST_FUNC xmemdup(const void *s, int n)
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{
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return memcpy(xmalloc(n), s, n);
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}
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// Die if we can't open a file and return a FILE* to it.
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// Notice we haven't got xfread(), This is for use with fscanf() and friends.
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FILE* FAST_FUNC xfopen(const char *path, const char *mode)
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{
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FILE *fp = fopen(path, mode);
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if (fp == NULL)
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bb_perror_msg_and_die("can't open '%s'", path);
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return fp;
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}
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// Die if we can't open a file and return a fd.
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int FAST_FUNC xopen3(const char *pathname, int flags, int mode)
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{
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int ret;
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ret = open(pathname, flags, mode);
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if (ret < 0) {
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bb_perror_msg_and_die("can't open '%s'", pathname);
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}
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return ret;
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}
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// Die if we can't open a file and return a fd.
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int FAST_FUNC xopen(const char *pathname, int flags)
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{
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return xopen3(pathname, flags, 0666);
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}
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// Warn if we can't open a file and return a fd.
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int FAST_FUNC open3_or_warn(const char *pathname, int flags, int mode)
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{
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int ret;
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ret = open(pathname, flags, mode);
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if (ret < 0) {
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bb_perror_msg("can't open '%s'", pathname);
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}
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return ret;
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}
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// Warn if we can't open a file and return a fd.
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int FAST_FUNC open_or_warn(const char *pathname, int flags)
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{
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return open3_or_warn(pathname, flags, 0666);
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}
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/* Die if we can't open an existing file readonly with O_NONBLOCK
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* and return the fd.
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* Note that for ioctl O_RDONLY is sufficient.
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*/
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int FAST_FUNC xopen_nonblocking(const char *pathname)
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{
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return xopen(pathname, O_RDONLY | O_NONBLOCK);
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}
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int FAST_FUNC xopen_as_uid_gid(const char *pathname, int flags, uid_t u, gid_t g)
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{
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int fd;
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uid_t old_euid = geteuid();
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gid_t old_egid = getegid();
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xsetegid(g);
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xseteuid(u);
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fd = xopen(pathname, flags);
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xseteuid(old_euid);
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xsetegid(old_egid);
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return fd;
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}
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void FAST_FUNC xunlink(const char *pathname)
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{
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if (unlink(pathname))
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bb_perror_msg_and_die("can't remove file '%s'", pathname);
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}
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void FAST_FUNC xrename(const char *oldpath, const char *newpath)
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{
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if (rename(oldpath, newpath))
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bb_perror_msg_and_die("can't move '%s' to '%s'", oldpath, newpath);
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}
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int FAST_FUNC rename_or_warn(const char *oldpath, const char *newpath)
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{
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int n = rename(oldpath, newpath);
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if (n)
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bb_perror_msg("can't move '%s' to '%s'", oldpath, newpath);
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return n;
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}
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void FAST_FUNC xpipe(int filedes[2])
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{
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if (pipe(filedes))
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bb_perror_msg_and_die("can't create pipe");
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}
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void FAST_FUNC xdup2(int from, int to)
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{
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if (dup2(from, to) != to)
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bb_perror_msg_and_die("can't duplicate file descriptor");
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}
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// "Renumber" opened fd
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void FAST_FUNC xmove_fd(int from, int to)
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{
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if (from == to)
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return;
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xdup2(from, to);
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close(from);
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}
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// Die with an error message if we can't write the entire buffer.
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void FAST_FUNC xwrite(int fd, const void *buf, size_t count)
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{
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if (count) {
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ssize_t size = full_write(fd, buf, count);
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if ((size_t)size != count)
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bb_error_msg_and_die("short write");
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}
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}
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void FAST_FUNC xwrite_str(int fd, const char *str)
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{
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xwrite(fd, str, strlen(str));
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}
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void FAST_FUNC xclose(int fd)
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{
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if (close(fd))
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bb_perror_msg_and_die("close failed");
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}
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// Die with an error message if we can't lseek to the right spot.
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off_t FAST_FUNC xlseek(int fd, off_t offset, int whence)
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{
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off_t off = lseek(fd, offset, whence);
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if (off == (off_t)-1) {
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if (whence == SEEK_SET)
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bb_perror_msg_and_die("lseek(%"OFF_FMT"u)", offset);
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bb_perror_msg_and_die("lseek");
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}
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return off;
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}
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int FAST_FUNC xmkstemp(char *template)
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{
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int fd = mkstemp(template);
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if (fd < 0)
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bb_perror_msg_and_die("can't create temp file '%s'", template);
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return fd;
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}
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// Die with supplied filename if this FILE* has ferror set.
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void FAST_FUNC die_if_ferror(FILE *fp, const char *fn)
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{
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if (ferror(fp)) {
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/* ferror doesn't set useful errno */
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bb_error_msg_and_die("%s: I/O error", fn);
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}
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}
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// Die with an error message if stdout has ferror set.
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void FAST_FUNC die_if_ferror_stdout(void)
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{
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die_if_ferror(stdout, bb_msg_standard_output);
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}
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int FAST_FUNC fflush_all(void)
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{
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return fflush(NULL);
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}
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int FAST_FUNC bb_putchar(int ch)
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{
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return putchar(ch);
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}
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/* Die with an error message if we can't copy an entire FILE* to stdout,
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* then close that file. */
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void FAST_FUNC xprint_and_close_file(FILE *file)
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{
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fflush_all();
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// copyfd outputs error messages for us.
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if (bb_copyfd_eof(fileno(file), STDOUT_FILENO) == -1)
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xfunc_die();
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fclose(file);
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}
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// Die with an error message if we can't malloc() enough space and do an
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// sprintf() into that space.
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char* FAST_FUNC xasprintf(const char *format, ...)
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{
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va_list p;
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int r;
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char *string_ptr;
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va_start(p, format);
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r = vasprintf(&string_ptr, format, p);
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va_end(p);
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if (r < 0)
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bb_error_msg_and_die(bb_msg_memory_exhausted);
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return string_ptr;
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}
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void FAST_FUNC xsetenv(const char *key, const char *value)
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{
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if (setenv(key, value, 1))
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bb_error_msg_and_die(bb_msg_memory_exhausted);
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}
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/* Handles "VAR=VAL" strings, even those which are part of environ
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* _right now_
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*/
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void FAST_FUNC bb_unsetenv(const char *var)
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{
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char *tp = strchr(var, '=');
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if (!tp) {
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unsetenv(var);
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return;
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}
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/* In case var was putenv'ed, we can't replace '='
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* with NUL and unsetenv(var) - it won't work,
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* env is modified by the replacement, unsetenv
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* sees "VAR" instead of "VAR=VAL" and does not remove it!
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* horror :( */
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tp = xstrndup(var, tp - var);
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unsetenv(tp);
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free(tp);
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}
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void FAST_FUNC bb_unsetenv_and_free(char *var)
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{
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bb_unsetenv(var);
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free(var);
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}
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// Die with an error message if we can't set gid. (Because resource limits may
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// limit this user to a given number of processes, and if that fills up the
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// setgid() will fail and we'll _still_be_root_, which is bad.)
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void FAST_FUNC xsetgid(gid_t gid)
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{
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if (setgid(gid)) bb_perror_msg_and_die("setgid");
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}
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// Die with an error message if we can't set uid. (See xsetgid() for why.)
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void FAST_FUNC xsetuid(uid_t uid)
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{
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if (setuid(uid)) bb_perror_msg_and_die("setuid");
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}
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void FAST_FUNC xsetegid(gid_t egid)
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{
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if (setegid(egid)) bb_perror_msg_and_die("setegid");
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}
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void FAST_FUNC xseteuid(uid_t euid)
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{
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if (seteuid(euid)) bb_perror_msg_and_die("seteuid");
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}
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// Die if we can't chdir to a new path.
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void FAST_FUNC xchdir(const char *path)
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{
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if (chdir(path))
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bb_perror_msg_and_die("can't change directory to '%s'", path);
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}
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void FAST_FUNC xfchdir(int fd)
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{
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if (fchdir(fd))
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bb_perror_msg_and_die("fchdir");
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}
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void FAST_FUNC xchroot(const char *path)
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{
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if (chroot(path))
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bb_perror_msg_and_die("can't change root directory to '%s'", path);
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xchdir("/");
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}
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// Print a warning message if opendir() fails, but don't die.
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DIR* FAST_FUNC warn_opendir(const char *path)
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{
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DIR *dp;
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dp = opendir(path);
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if (!dp)
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bb_perror_msg("can't open '%s'", path);
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return dp;
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}
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// Die with an error message if opendir() fails.
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DIR* FAST_FUNC xopendir(const char *path)
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{
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DIR *dp;
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dp = opendir(path);
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if (!dp)
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bb_perror_msg_and_die("can't open '%s'", path);
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return dp;
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}
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// Die with an error message if we can't open a new socket.
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int FAST_FUNC xsocket(int domain, int type, int protocol)
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{
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int r = socket(domain, type, protocol);
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if (r < 0) {
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/* Hijack vaguely related config option */
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#if ENABLE_VERBOSE_RESOLUTION_ERRORS
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const char *s = "INET";
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# ifdef AF_PACKET
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if (domain == AF_PACKET) s = "PACKET";
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# endif
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# ifdef AF_NETLINK
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if (domain == AF_NETLINK) s = "NETLINK";
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# endif
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IF_FEATURE_IPV6(if (domain == AF_INET6) s = "INET6";)
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bb_perror_msg_and_die("socket(AF_%s,%d,%d)", s, type, protocol);
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#else
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bb_perror_msg_and_die("socket");
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#endif
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}
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return r;
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}
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// Die with an error message if we can't bind a socket to an address.
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void FAST_FUNC xbind(int sockfd, struct sockaddr *my_addr, socklen_t addrlen)
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{
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if (bind(sockfd, my_addr, addrlen)) bb_perror_msg_and_die("bind");
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}
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// Die with an error message if we can't listen for connections on a socket.
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void FAST_FUNC xlisten(int s, int backlog)
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{
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if (listen(s, backlog)) bb_perror_msg_and_die("listen");
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}
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/* Die with an error message if sendto failed.
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* Return bytes sent otherwise */
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ssize_t FAST_FUNC xsendto(int s, const void *buf, size_t len, const struct sockaddr *to,
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socklen_t tolen)
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{
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ssize_t ret = sendto(s, buf, len, 0, to, tolen);
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if (ret < 0) {
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if (ENABLE_FEATURE_CLEAN_UP)
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close(s);
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bb_perror_msg_and_die("sendto");
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}
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return ret;
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}
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// xstat() - a stat() which dies on failure with meaningful error message
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void FAST_FUNC xstat(const char *name, struct stat *stat_buf)
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{
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if (stat(name, stat_buf))
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bb_perror_msg_and_die("can't stat '%s'", name);
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}
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void FAST_FUNC xfstat(int fd, struct stat *stat_buf, const char *errmsg)
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{
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/* errmsg is usually a file name, but not always:
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* xfstat may be called in a spot where file name is no longer
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* available, and caller may give e.g. "can't stat input file" string.
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*/
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if (fstat(fd, stat_buf))
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bb_simple_perror_msg_and_die(errmsg);
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}
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// selinux_or_die() - die if SELinux is disabled.
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void FAST_FUNC selinux_or_die(void)
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{
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#if ENABLE_SELINUX
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int rc = is_selinux_enabled();
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if (rc == 0) {
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bb_error_msg_and_die("SELinux is disabled");
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} else if (rc < 0) {
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bb_error_msg_and_die("is_selinux_enabled() failed");
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}
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#else
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bb_error_msg_and_die("SELinux support is disabled");
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#endif
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}
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int FAST_FUNC ioctl_or_perror_and_die(int fd, unsigned request, void *argp, const char *fmt,...)
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{
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int ret;
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va_list p;
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ret = ioctl(fd, request, argp);
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if (ret < 0) {
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|
va_start(p, fmt);
|
|
bb_verror_msg(fmt, p, strerror(errno));
|
|
/* xfunc_die can actually longjmp, so be nice */
|
|
va_end(p);
|
|
xfunc_die();
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int FAST_FUNC ioctl_or_perror(int fd, unsigned request, void *argp, const char *fmt,...)
|
|
{
|
|
va_list p;
|
|
int ret = ioctl(fd, request, argp);
|
|
|
|
if (ret < 0) {
|
|
va_start(p, fmt);
|
|
bb_verror_msg(fmt, p, strerror(errno));
|
|
va_end(p);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
#if ENABLE_IOCTL_HEX2STR_ERROR
|
|
int FAST_FUNC bb_ioctl_or_warn(int fd, unsigned request, void *argp, const char *ioctl_name)
|
|
{
|
|
int ret;
|
|
|
|
ret = ioctl(fd, request, argp);
|
|
if (ret < 0)
|
|
bb_simple_perror_msg(ioctl_name);
|
|
return ret;
|
|
}
|
|
int FAST_FUNC bb_xioctl(int fd, unsigned request, void *argp, const char *ioctl_name)
|
|
{
|
|
int ret;
|
|
|
|
ret = ioctl(fd, request, argp);
|
|
if (ret < 0)
|
|
bb_simple_perror_msg_and_die(ioctl_name);
|
|
return ret;
|
|
}
|
|
#else
|
|
int FAST_FUNC bb_ioctl_or_warn(int fd, unsigned request, void *argp)
|
|
{
|
|
int ret;
|
|
|
|
ret = ioctl(fd, request, argp);
|
|
if (ret < 0)
|
|
bb_perror_msg("ioctl %#x failed", request);
|
|
return ret;
|
|
}
|
|
int FAST_FUNC bb_xioctl(int fd, unsigned request, void *argp)
|
|
{
|
|
int ret;
|
|
|
|
ret = ioctl(fd, request, argp);
|
|
if (ret < 0)
|
|
bb_perror_msg_and_die("ioctl %#x failed", request);
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
char* FAST_FUNC xmalloc_ttyname(int fd)
|
|
{
|
|
char buf[128];
|
|
int r = ttyname_r(fd, buf, sizeof(buf) - 1);
|
|
if (r)
|
|
return NULL;
|
|
return xstrdup(buf);
|
|
}
|
|
|
|
void FAST_FUNC generate_uuid(uint8_t *buf)
|
|
{
|
|
/* http://www.ietf.org/rfc/rfc4122.txt
|
|
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | time_low |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | time_mid | time_hi_and_version |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* |clk_seq_and_variant | node (0-1) |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | node (2-5) |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* IOW, uuid has this layout:
|
|
* uint32_t time_low (big endian)
|
|
* uint16_t time_mid (big endian)
|
|
* uint16_t time_hi_and_version (big endian)
|
|
* version is a 4-bit field:
|
|
* 1 Time-based
|
|
* 2 DCE Security, with embedded POSIX UIDs
|
|
* 3 Name-based (MD5)
|
|
* 4 Randomly generated
|
|
* 5 Name-based (SHA-1)
|
|
* uint16_t clk_seq_and_variant (big endian)
|
|
* variant is a 3-bit field:
|
|
* 0xx Reserved, NCS backward compatibility
|
|
* 10x The variant specified in rfc4122
|
|
* 110 Reserved, Microsoft backward compatibility
|
|
* 111 Reserved for future definition
|
|
* uint8_t node[6]
|
|
*
|
|
* For version 4, these bits are set/cleared:
|
|
* time_hi_and_version & 0x0fff | 0x4000
|
|
* clk_seq_and_variant & 0x3fff | 0x8000
|
|
*/
|
|
pid_t pid;
|
|
int i;
|
|
|
|
i = open("/dev/urandom", O_RDONLY);
|
|
if (i >= 0) {
|
|
read(i, buf, 16);
|
|
close(i);
|
|
}
|
|
/* Paranoia. /dev/urandom may be missing.
|
|
* rand() is guaranteed to generate at least [0, 2^15) range,
|
|
* but lowest bits in some libc are not so "random". */
|
|
srand(monotonic_us()); /* pulls in printf */
|
|
pid = getpid();
|
|
while (1) {
|
|
for (i = 0; i < 16; i++)
|
|
buf[i] ^= rand() >> 5;
|
|
if (pid == 0)
|
|
break;
|
|
srand(pid);
|
|
pid = 0;
|
|
}
|
|
|
|
/* version = 4 */
|
|
buf[4 + 2 ] = (buf[4 + 2 ] & 0x0f) | 0x40;
|
|
/* variant = 10x */
|
|
buf[4 + 2 + 2] = (buf[4 + 2 + 2] & 0x3f) | 0x80;
|
|
}
|
|
|
|
#if BB_MMU
|
|
pid_t FAST_FUNC xfork(void)
|
|
{
|
|
pid_t pid;
|
|
pid = fork();
|
|
if (pid < 0) /* wtf? */
|
|
bb_perror_msg_and_die("vfork"+1);
|
|
return pid;
|
|
}
|
|
#endif
|
|
|
|
void FAST_FUNC xvfork_parent_waits_and_exits(void)
|
|
{
|
|
pid_t pid;
|
|
|
|
fflush_all();
|
|
pid = xvfork();
|
|
if (pid > 0) {
|
|
/* Parent */
|
|
int exit_status = wait_for_exitstatus(pid);
|
|
if (WIFSIGNALED(exit_status))
|
|
kill_myself_with_sig(WTERMSIG(exit_status));
|
|
_exit(WEXITSTATUS(exit_status));
|
|
}
|
|
/* Child continues */
|
|
}
|