[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Utility routines.
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| 4 | *
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| 5 | * Copyright (C) tons of folks. Tracking down who wrote what
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| 6 | * isn't something I'm going to worry about... If you wrote something
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| 7 | * here, please feel free to acknowledge your work.
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| 8 | *
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| 9 | * Based in part on code from sash, Copyright (c) 1999 by David I. Bell
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| 10 | * Permission has been granted to redistribute this code under the GPL.
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| 11 | *
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| 12 | * Licensed under GPLv2 or later, see file License in this tarball for details.
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| 13 | */
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| 14 |
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[1770] | 15 | #include <assert.h>
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[821] | 16 | #include "busybox.h"
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| 17 |
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[1770] | 18 | /* Apparently uclibc defines __GLIBC__ (compat trick?). Oh well. */
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| 19 | #if ENABLE_STATIC && defined(__GLIBC__) && !defined(__UCLIBC__)
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| 20 | #warning Static linking against glibc produces buggy executables
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| 21 | #warning (glibc does not cope well with ld --gc-sections).
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| 22 | #warning See sources.redhat.com/bugzilla/show_bug.cgi?id=3400
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| 23 | #warning Note that glibc is unsuitable for static linking anyway.
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| 24 | #warning If you still want to do it, remove -Wl,--gc-sections
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| 25 | #warning from top-level Makefile and remove this warning.
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| 26 | #error Aborting compilation.
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| 27 | #endif
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| 28 |
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| 29 |
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| 30 | /* Declare <applet>_main() */
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| 31 | #define PROTOTYPES
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| 32 | #include "applets.h"
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| 33 | #undef PROTOTYPES
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| 34 |
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[821] | 35 | #if ENABLE_SHOW_USAGE && !ENABLE_FEATURE_COMPRESS_USAGE
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[1770] | 36 | /* Define usage_messages[] */
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| 37 | static const char usage_messages[] ALIGN1 = ""
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[821] | 38 | #define MAKE_USAGE
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| 39 | #include "usage.h"
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| 40 | #include "applets.h"
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| 41 | ;
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| 42 | #undef MAKE_USAGE
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| 43 | #else
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| 44 | #define usage_messages 0
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[1770] | 45 | #endif /* SHOW_USAGE */
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[821] | 46 |
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[1770] | 47 | /* Define struct bb_applet applets[] */
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[821] | 48 | #include "applets.h"
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[1770] | 49 | /* The -1 arises because of the {0,NULL,0,-1} entry. */
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[821] | 50 |
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[1770] | 51 | #if ENABLE_FEATURE_SH_STANDALONE
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| 52 | const unsigned short NUM_APPLETS = ARRAY_SIZE(applets);
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| 53 | #endif
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| 54 | const struct bb_applet *current_applet;
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| 55 | const char *applet_name ATTRIBUTE_EXTERNALLY_VISIBLE;
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| 56 | #if !BB_MMU
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| 57 | bool re_execed;
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| 58 | #endif
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[821] | 59 |
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[1770] | 60 | USE_FEATURE_SUID(static uid_t ruid;) /* real uid */
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[821] | 61 |
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[1770] | 62 | #if ENABLE_FEATURE_SUID_CONFIG
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[821] | 63 |
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[1770] | 64 | /* applets[] is const, so we have to define this "override" structure */
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| 65 | static struct BB_suid_config {
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| 66 | const struct bb_applet *m_applet;
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| 67 | uid_t m_uid;
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| 68 | gid_t m_gid;
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| 69 | mode_t m_mode;
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| 70 | struct BB_suid_config *m_next;
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[821] | 71 | } *suid_config;
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| 72 |
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[1770] | 73 | static bool suid_cfg_readable;
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[821] | 74 |
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| 75 | /* check if u is member of group g */
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[1770] | 76 | static int ingroup(uid_t u, gid_t g)
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[821] | 77 | {
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[1770] | 78 | struct group *grp = getgrgid(g);
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[821] | 79 |
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[1770] | 80 | if (grp) {
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| 81 | char **mem;
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[821] | 82 |
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[1770] | 83 | for (mem = grp->gr_mem; *mem; mem++) {
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| 84 | struct passwd *pwd = getpwnam(*mem);
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[821] | 85 |
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[1770] | 86 | if (pwd && (pwd->pw_uid == u))
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| 87 | return 1;
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| 88 | }
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[821] | 89 | }
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[1770] | 90 | return 0;
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[821] | 91 | }
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| 92 |
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| 93 | /* This should probably be a libbb routine. In that case,
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| 94 | * I'd probably rename it to something like bb_trimmed_slice.
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| 95 | */
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| 96 | static char *get_trimmed_slice(char *s, char *e)
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| 97 | {
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| 98 | /* First, consider the value at e to be nul and back up until we
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| 99 | * reach a non-space char. Set the char after that (possibly at
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| 100 | * the original e) to nul. */
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| 101 | while (e-- > s) {
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| 102 | if (!isspace(*e)) {
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| 103 | break;
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| 104 | }
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| 105 | }
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[1770] | 106 | e[1] = '\0';
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[821] | 107 |
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| 108 | /* Next, advance past all leading space and return a ptr to the
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| 109 | * first non-space char; possibly the terminating nul. */
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| 110 | return skip_whitespace(s);
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| 111 | }
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| 112 |
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| 113 | /* Don't depend on the tools to combine strings. */
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[1770] | 114 | static const char config_file[] ALIGN1 = "/etc/busybox.conf";
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[821] | 115 |
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| 116 | /* We don't supply a value for the nul, so an index adjustment is
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| 117 | * necessary below. Also, we use unsigned short here to save some
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| 118 | * space even though these are really mode_t values. */
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[1770] | 119 | static const unsigned short mode_mask[] ALIGN2 = {
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| 120 | /* SST sst xxx --- */
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[821] | 121 | S_ISUID, S_ISUID|S_IXUSR, S_IXUSR, 0, /* user */
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| 122 | S_ISGID, S_ISGID|S_IXGRP, S_IXGRP, 0, /* group */
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| 123 | 0, S_IXOTH, S_IXOTH, 0 /* other */
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| 124 | };
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| 125 |
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[1770] | 126 | #define parse_error(x) do { errmsg = x; goto pe_label; } while (0)
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| 127 |
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[821] | 128 | static void parse_config_file(void)
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| 129 | {
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| 130 | struct BB_suid_config *sct_head;
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| 131 | struct BB_suid_config *sct;
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[1770] | 132 | const struct bb_applet *applet;
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[821] | 133 | FILE *f;
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[1770] | 134 | const char *errmsg;
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[821] | 135 | char *s;
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| 136 | char *e;
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[1770] | 137 | int i;
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| 138 | unsigned lc;
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| 139 | smallint section;
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[821] | 140 | char buffer[256];
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| 141 | struct stat st;
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| 142 |
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[1770] | 143 | assert(!suid_config); /* Should be set to NULL by bss init. */
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[821] | 144 |
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[1770] | 145 | ruid = getuid();
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| 146 | if (ruid == 0) /* run by root - don't need to even read config file */
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[821] | 147 | return;
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[1770] | 148 |
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| 149 | if ((stat(config_file, &st) != 0) /* No config file? */
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| 150 | || !S_ISREG(st.st_mode) /* Not a regular file? */
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| 151 | || (st.st_uid != 0) /* Not owned by root? */
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| 152 | || (st.st_mode & (S_IWGRP | S_IWOTH)) /* Writable by non-root? */
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| 153 | || !(f = fopen(config_file, "r")) /* Cannot open? */
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| 154 | ) {
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| 155 | return;
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[821] | 156 | }
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| 157 |
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| 158 | suid_cfg_readable = 1;
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| 159 | sct_head = NULL;
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| 160 | section = lc = 0;
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| 161 |
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[1770] | 162 | while (1) {
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[821] | 163 | s = buffer;
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| 164 |
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| 165 | if (!fgets(s, sizeof(buffer), f)) { /* Are we done? */
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| 166 | if (ferror(f)) { /* Make sure it wasn't a read error. */
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| 167 | parse_error("reading");
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| 168 | }
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| 169 | fclose(f);
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| 170 | suid_config = sct_head; /* Success, so set the pointer. */
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| 171 | return;
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| 172 | }
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| 173 |
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| 174 | lc++; /* Got a (partial) line. */
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| 175 |
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| 176 | /* If a line is too long for our buffer, we consider it an error.
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| 177 | * The following test does mistreat one corner case though.
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| 178 | * If the final line of the file does not end with a newline and
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| 179 | * yet exactly fills the buffer, it will be treated as too long
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| 180 | * even though there isn't really a problem. But it isn't really
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| 181 | * worth adding code to deal with such an unlikely situation, and
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| 182 | * we do err on the side of caution. Besides, the line would be
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| 183 | * too long if it did end with a newline. */
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| 184 | if (!strchr(s, '\n') && !feof(f)) {
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| 185 | parse_error("line too long");
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| 186 | }
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| 187 |
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| 188 | /* Trim leading and trailing whitespace, ignoring comments, and
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| 189 | * check if the resulting string is empty. */
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[1770] | 190 | s = get_trimmed_slice(s, strchrnul(s, '#'));
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| 191 | if (!*s) {
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[821] | 192 | continue;
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| 193 | }
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| 194 |
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| 195 | /* Check for a section header. */
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| 196 |
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| 197 | if (*s == '[') {
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| 198 | /* Unlike the old code, we ignore leading and trailing
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| 199 | * whitespace for the section name. We also require that
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| 200 | * there are no stray characters after the closing bracket. */
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[1770] | 201 | e = strchr(s, ']');
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| 202 | if (!e /* Missing right bracket? */
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| 203 | || e[1] /* Trailing characters? */
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| 204 | || !*(s = get_trimmed_slice(s+1, e)) /* Missing name? */
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| 205 | ) {
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[821] | 206 | parse_error("section header");
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| 207 | }
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| 208 | /* Right now we only have one section so just check it.
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| 209 | * If more sections are added in the future, please don't
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| 210 | * resort to cascading ifs with multiple strcasecmp calls.
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| 211 | * That kind of bloated code is all too common. A loop
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| 212 | * and a string table would be a better choice unless the
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| 213 | * number of sections is very small. */
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| 214 | if (strcasecmp(s, "SUID") == 0) {
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| 215 | section = 1;
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| 216 | continue;
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| 217 | }
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| 218 | section = -1; /* Unknown section so set to skip. */
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| 219 | continue;
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| 220 | }
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| 221 |
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| 222 | /* Process sections. */
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| 223 |
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| 224 | if (section == 1) { /* SUID */
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| 225 | /* Since we trimmed leading and trailing space above, we're
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| 226 | * now looking for strings of the form
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| 227 | * <key>[::space::]*=[::space::]*<value>
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| 228 | * where both key and value could contain inner whitespace. */
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| 229 |
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| 230 | /* First get the key (an applet name in our case). */
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[1770] | 231 | e = strchr(s, '=');
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| 232 | if (e) {
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[821] | 233 | s = get_trimmed_slice(s, e);
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| 234 | }
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| 235 | if (!e || !*s) { /* Missing '=' or empty key. */
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| 236 | parse_error("keyword");
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| 237 | }
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| 238 |
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| 239 | /* Ok, we have an applet name. Process the rhs if this
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| 240 | * applet is currently built in and ignore it otherwise.
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[1770] | 241 | * Note: this can hide config file bugs which only pop
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[821] | 242 | * up when the busybox configuration is changed. */
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[1770] | 243 | applet = find_applet_by_name(s);
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| 244 | if (applet) {
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[821] | 245 | /* Note: We currently don't check for duplicates!
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| 246 | * The last config line for each applet will be the
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| 247 | * one used since we insert at the head of the list.
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| 248 | * I suppose this could be considered a feature. */
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| 249 | sct = xmalloc(sizeof(struct BB_suid_config));
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| 250 | sct->m_applet = applet;
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| 251 | sct->m_mode = 0;
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| 252 | sct->m_next = sct_head;
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| 253 | sct_head = sct;
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| 254 |
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| 255 | /* Get the specified mode. */
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| 256 |
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| 257 | e = skip_whitespace(e+1);
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| 258 |
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[1770] | 259 | for (i = 0; i < 3; i++) {
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| 260 | /* There are 4 chars + 1 nul for each of user/group/other. */
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| 261 | static const char mode_chars[] ALIGN1 = "Ssx-\0" "Ssx-\0" "Ttx-";
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| 262 |
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[821] | 263 | const char *q;
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[1770] | 264 | q = strchrnul(mode_chars + 5*i, *e++);
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| 265 | if (!*q) {
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[821] | 266 | parse_error("mode");
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| 267 | }
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| 268 | /* Adjust by -i to account for nul. */
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| 269 | sct->m_mode |= mode_mask[(q - mode_chars) - i];
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| 270 | }
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| 271 |
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| 272 | /* Now get the the user/group info. */
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| 273 |
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| 274 | s = skip_whitespace(e);
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| 275 |
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[1770] | 276 | /* Note: we require whitespace between the mode and the
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[821] | 277 | * user/group info. */
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| 278 | if ((s == e) || !(e = strchr(s, '.'))) {
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| 279 | parse_error("<uid>.<gid>");
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| 280 | }
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[1770] | 281 | *e++ = '\0';
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[821] | 282 |
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| 283 | /* We can't use get_ug_id here since it would exit()
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| 284 | * if a uid or gid was not found. Oh well... */
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[1770] | 285 | sct->m_uid = bb_strtoul(s, NULL, 10);
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| 286 | if (errno) {
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| 287 | struct passwd *pwd = getpwnam(s);
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| 288 | if (!pwd) {
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| 289 | parse_error("user");
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[821] | 290 | }
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[1770] | 291 | sct->m_uid = pwd->pw_uid;
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| 292 | }
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[821] | 293 |
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[1770] | 294 | sct->m_gid = bb_strtoul(e, NULL, 10);
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| 295 | if (errno) {
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| 296 | struct group *grp;
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| 297 | grp = getgrnam(e);
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| 298 | if (!grp) {
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| 299 | parse_error("group");
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[821] | 300 | }
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[1770] | 301 | sct->m_gid = grp->gr_gid;
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[821] | 302 | }
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| 303 | }
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| 304 | continue;
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| 305 | }
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| 306 |
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| 307 | /* Unknown sections are ignored. */
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| 308 |
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| 309 | /* Encountering configuration lines prior to seeing a
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| 310 | * section header is treated as an error. This is how
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| 311 | * the old code worked, but it may not be desirable.
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| 312 | * We may want to simply ignore such lines in case they
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| 313 | * are used in some future version of busybox. */
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| 314 | if (!section) {
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| 315 | parse_error("keyword outside section");
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| 316 | }
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| 317 |
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[1770] | 318 | } /* while (1) */
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[821] | 319 |
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| 320 | pe_label:
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| 321 | fprintf(stderr, "Parse error in %s, line %d: %s\n",
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[1770] | 322 | config_file, lc, errmsg);
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[821] | 323 |
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| 324 | fclose(f);
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| 325 | /* Release any allocated memory before returning. */
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| 326 | while (sct_head) {
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| 327 | sct = sct_head->m_next;
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| 328 | free(sct_head);
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| 329 | sct_head = sct;
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| 330 | }
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| 331 | }
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| 332 | #else
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[1770] | 333 | static inline void parse_config_file(void)
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| 334 | {
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| 335 | USE_FEATURE_SUID(ruid = getuid();)
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| 336 | }
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| 337 | #endif /* FEATURE_SUID_CONFIG */
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[821] | 338 |
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[1770] | 339 |
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| 340 | #if ENABLE_FEATURE_SUID
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| 341 | static void check_suid(const struct bb_applet *applet)
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[821] | 342 | {
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[1770] | 343 | gid_t rgid; /* real gid */
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[821] | 344 |
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[1770] | 345 | if (ruid == 0) /* set by parse_config_file() */
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| 346 | return; /* run by root - no need to check more */
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| 347 | rgid = getgid();
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[821] | 348 |
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[1770] | 349 | #if ENABLE_FEATURE_SUID_CONFIG
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| 350 | if (suid_cfg_readable) {
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| 351 | uid_t uid;
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| 352 | struct BB_suid_config *sct;
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| 353 | mode_t m;
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[821] | 354 |
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[1770] | 355 | for (sct = suid_config; sct; sct = sct->m_next) {
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| 356 | if (sct->m_applet == applet)
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| 357 | goto found;
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| 358 | }
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| 359 | /* default: drop all privileges */
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| 360 | xsetgid(rgid);
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| 361 | xsetuid(ruid);
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| 362 | return;
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| 363 | found:
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| 364 | m = sct->m_mode;
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| 365 | if (sct->m_uid == ruid)
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| 366 | /* same uid */
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| 367 | m >>= 6;
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| 368 | else if ((sct->m_gid == rgid) || ingroup(ruid, sct->m_gid))
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| 369 | /* same group / in group */
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| 370 | m >>= 3;
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[821] | 371 |
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[1770] | 372 | if (!(m & S_IXOTH)) /* is x bit not set ? */
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| 373 | bb_error_msg_and_die("you have no permission to run this applet!");
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[821] | 374 |
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[1770] | 375 | /* _both_ sgid and group_exec have to be set for setegid */
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| 376 | if ((sct->m_mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP))
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| 377 | rgid = sct->m_gid;
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| 378 | /* else (no setegid) we will set egid = rgid */
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[821] | 379 |
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[1770] | 380 | /* We set effective AND saved ids. If saved-id is not set
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| 381 | * like we do below, seteiud(0) can still later succeed! */
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| 382 | if (setresgid(-1, rgid, rgid))
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| 383 | bb_perror_msg_and_die("setresgid");
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| 384 |
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| 385 | /* do we have to set effective uid? */
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| 386 | uid = ruid;
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| 387 | if (sct->m_mode & S_ISUID)
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| 388 | uid = sct->m_uid;
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| 389 | /* else (no seteuid) we will set euid = ruid */
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| 390 |
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| 391 | if (setresuid(-1, uid, uid))
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| 392 | bb_perror_msg_and_die("setresuid");
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| 393 | return;
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[821] | 394 | }
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[1770] | 395 | #if !ENABLE_FEATURE_SUID_CONFIG_QUIET
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| 396 | {
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| 397 | static bool onetime = 0;
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[821] | 398 |
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[1770] | 399 | if (!onetime) {
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| 400 | onetime = 1;
|
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| 401 | fprintf(stderr, "Using fallback suid method\n");
|
---|
| 402 | }
|
---|
[821] | 403 | }
|
---|
| 404 | #endif
|
---|
| 405 | #endif
|
---|
| 406 |
|
---|
[1770] | 407 | if (applet->need_suid == _BB_SUID_ALWAYS) {
|
---|
| 408 | /* Real uid is not 0. If euid isn't 0 too, suid bit
|
---|
| 409 | * is most probably not set on our executable */
|
---|
| 410 | if (geteuid())
|
---|
| 411 | bb_error_msg_and_die("applet requires root privileges!");
|
---|
| 412 | } else if (applet->need_suid == _BB_SUID_NEVER) {
|
---|
| 413 | xsetgid(rgid); /* drop all privileges */
|
---|
| 414 | xsetuid(ruid);
|
---|
| 415 | }
|
---|
[821] | 416 | }
|
---|
| 417 | #else
|
---|
[1770] | 418 | #define check_suid(x) ((void)0)
|
---|
| 419 | #endif /* FEATURE_SUID */
|
---|
[821] | 420 |
|
---|
| 421 |
|
---|
| 422 | #if ENABLE_FEATURE_COMPRESS_USAGE
|
---|
| 423 |
|
---|
| 424 | #include "usage_compressed.h"
|
---|
| 425 | #include "unarchive.h"
|
---|
| 426 |
|
---|
| 427 | static const char *unpack_usage_messages(void)
|
---|
| 428 | {
|
---|
[1770] | 429 | char *outbuf = NULL;
|
---|
| 430 | bunzip_data *bd;
|
---|
| 431 | int i;
|
---|
[821] | 432 |
|
---|
[1770] | 433 | i = start_bunzip(&bd,
|
---|
| 434 | /* src_fd: */ -1,
|
---|
| 435 | /* inbuf: */ packed_usage,
|
---|
| 436 | /* len: */ sizeof(packed_usage));
|
---|
| 437 | /* read_bunzip can longjmp to start_bunzip, and ultimately
|
---|
| 438 | * end up here with i != 0 on read data errors! Not trivial */
|
---|
| 439 | if (!i) {
|
---|
| 440 | /* Cannot use xmalloc: will leak bd in NOFORK case! */
|
---|
| 441 | outbuf = malloc_or_warn(SIZEOF_usage_messages);
|
---|
| 442 | if (outbuf)
|
---|
| 443 | read_bunzip(bd, outbuf, SIZEOF_usage_messages);
|
---|
[821] | 444 | }
|
---|
[1770] | 445 | dealloc_bunzip(bd);
|
---|
| 446 | return outbuf;
|
---|
[821] | 447 | }
|
---|
[1770] | 448 | #define dealloc_usage_messages(s) free(s)
|
---|
[821] | 449 |
|
---|
| 450 | #else
|
---|
[1770] | 451 |
|
---|
[821] | 452 | #define unpack_usage_messages() usage_messages
|
---|
[1770] | 453 | #define dealloc_usage_messages(s) ((void)(s))
|
---|
[821] | 454 |
|
---|
[1770] | 455 | #endif /* FEATURE_COMPRESS_USAGE */
|
---|
| 456 |
|
---|
| 457 |
|
---|
| 458 | void bb_show_usage(void)
|
---|
[821] | 459 | {
|
---|
| 460 | if (ENABLE_SHOW_USAGE) {
|
---|
| 461 | const char *format_string;
|
---|
[1770] | 462 | const char *p;
|
---|
| 463 | const char *usage_string = p = unpack_usage_messages();
|
---|
[821] | 464 | int i;
|
---|
| 465 |
|
---|
[1770] | 466 | i = current_applet - applets;
|
---|
| 467 | while (i) {
|
---|
| 468 | while (*p++) continue;
|
---|
| 469 | i--;
|
---|
| 470 | }
|
---|
[821] | 471 |
|
---|
[1770] | 472 | fprintf(stderr, "%s multi-call binary\n", bb_banner);
|
---|
| 473 | format_string = "\nUsage: %s %s\n\n";
|
---|
| 474 | if (*p == '\b')
|
---|
| 475 | format_string = "\nNo help available.\n\n";
|
---|
| 476 | fprintf(stderr, format_string, applet_name, p);
|
---|
| 477 | dealloc_usage_messages((char*)usage_string);
|
---|
[821] | 478 | }
|
---|
[1770] | 479 | xfunc_die();
|
---|
| 480 | }
|
---|
[821] | 481 |
|
---|
[1770] | 482 |
|
---|
| 483 | static int applet_name_compare(const void *name, const void *vapplet)
|
---|
| 484 | {
|
---|
| 485 | const struct bb_applet *applet = vapplet;
|
---|
| 486 |
|
---|
| 487 | return strcmp(name, applet->name);
|
---|
[821] | 488 | }
|
---|
| 489 |
|
---|
[1770] | 490 | const struct bb_applet *find_applet_by_name(const char *name)
|
---|
[821] | 491 | {
|
---|
[1770] | 492 | /* Do a binary search to find the applet entry given the name. */
|
---|
| 493 | return bsearch(name, applets, ARRAY_SIZE(applets)-1, sizeof(applets[0]),
|
---|
| 494 | applet_name_compare);
|
---|
| 495 | }
|
---|
[821] | 496 |
|
---|
[1770] | 497 |
|
---|
| 498 | #if ENABLE_FEATURE_INSTALLER
|
---|
| 499 | /* create (sym)links for each applet */
|
---|
| 500 | static void install_links(const char *busybox, int use_symbolic_links)
|
---|
| 501 | {
|
---|
| 502 | /* directory table
|
---|
| 503 | * this should be consistent w/ the enum,
|
---|
| 504 | * busybox.h::bb_install_loc_t, or else... */
|
---|
| 505 | static const char usr_bin [] ALIGN1 = "/usr/bin";
|
---|
| 506 | static const char usr_sbin[] ALIGN1 = "/usr/sbin";
|
---|
| 507 | static const char *const install_dir[] = {
|
---|
| 508 | &usr_bin [8], /* "", equivalent to "/" for concat_path_file() */
|
---|
| 509 | &usr_bin [4], /* "/bin" */
|
---|
| 510 | &usr_sbin[4], /* "/sbin" */
|
---|
| 511 | usr_bin,
|
---|
| 512 | usr_sbin
|
---|
| 513 | };
|
---|
| 514 |
|
---|
| 515 | int (*lf)(const char *, const char *) = link;
|
---|
| 516 | char *fpc;
|
---|
| 517 | int i;
|
---|
| 518 | int rc;
|
---|
| 519 |
|
---|
| 520 | if (use_symbolic_links)
|
---|
| 521 | lf = symlink;
|
---|
| 522 |
|
---|
| 523 | for (i = 0; applets[i].name != NULL; i++) {
|
---|
| 524 | fpc = concat_path_file(
|
---|
| 525 | install_dir[applets[i].install_loc],
|
---|
| 526 | applets[i].name);
|
---|
| 527 | rc = lf(busybox, fpc);
|
---|
| 528 | if (rc != 0 && errno != EEXIST) {
|
---|
| 529 | bb_perror_msg("%s", fpc);
|
---|
| 530 | }
|
---|
| 531 | free(fpc);
|
---|
| 532 | }
|
---|
[821] | 533 | }
|
---|
[1770] | 534 | #else
|
---|
| 535 | #define install_links(x,y) ((void)0)
|
---|
| 536 | #endif /* FEATURE_INSTALLER */
|
---|
[821] | 537 |
|
---|
| 538 |
|
---|
[1770] | 539 | /* If we were called as "busybox..." */
|
---|
| 540 | static int busybox_main(char **argv)
|
---|
[821] | 541 | {
|
---|
[1770] | 542 | if (!argv[1]) {
|
---|
| 543 | /* Called without arguments */
|
---|
| 544 | const struct bb_applet *a;
|
---|
| 545 | int col, output_width;
|
---|
| 546 | help:
|
---|
| 547 | output_width = 80;
|
---|
| 548 | if (ENABLE_FEATURE_AUTOWIDTH) {
|
---|
| 549 | /* Obtain the terminal width */
|
---|
| 550 | get_terminal_width_height(0, &output_width, NULL);
|
---|
| 551 | }
|
---|
| 552 | /* leading tab and room to wrap */
|
---|
| 553 | output_width -= sizeof("start-stop-daemon, ") + 8;
|
---|
| 554 |
|
---|
| 555 | printf("%s multi-call binary\n", bb_banner); /* reuse const string... */
|
---|
| 556 | printf("Copyright (C) 1998-2006 Erik Andersen, Rob Landley, and others.\n"
|
---|
| 557 | "Licensed under GPLv2. See source distribution for full notice.\n"
|
---|
| 558 | "\n"
|
---|
| 559 | "Usage: busybox [function] [arguments]...\n"
|
---|
| 560 | " or: [function] [arguments]...\n"
|
---|
| 561 | "\n"
|
---|
| 562 | "\tBusyBox is a multi-call binary that combines many common Unix\n"
|
---|
| 563 | "\tutilities into a single executable. Most people will create a\n"
|
---|
| 564 | "\tlink to busybox for each function they wish to use and BusyBox\n"
|
---|
| 565 | "\twill act like whatever it was invoked as!\n"
|
---|
| 566 | "\nCurrently defined functions:\n");
|
---|
| 567 | col = 0;
|
---|
| 568 | a = applets;
|
---|
| 569 | while (a->name) {
|
---|
| 570 | if (col > output_width) {
|
---|
| 571 | puts(",");
|
---|
| 572 | col = 0;
|
---|
| 573 | }
|
---|
| 574 | col += printf("%s%s", (col ? ", " : "\t"), a->name);
|
---|
| 575 | a++;
|
---|
| 576 | }
|
---|
| 577 | puts("\n");
|
---|
| 578 | return 0;
|
---|
| 579 | }
|
---|
| 580 |
|
---|
| 581 | if (ENABLE_FEATURE_INSTALLER && strcmp(argv[1], "--install") == 0) {
|
---|
| 582 | const char *busybox;
|
---|
| 583 | busybox = xmalloc_readlink(bb_busybox_exec_path);
|
---|
| 584 | if (!busybox)
|
---|
| 585 | busybox = bb_busybox_exec_path;
|
---|
| 586 | /* -s makes symlinks */
|
---|
| 587 | install_links(busybox, argv[2] && strcmp(argv[2], "-s") == 0);
|
---|
| 588 | return 0;
|
---|
| 589 | }
|
---|
| 590 |
|
---|
| 591 | if (strcmp(argv[1], "--help") == 0) {
|
---|
| 592 | /* "busybox --help [<applet>]" */
|
---|
| 593 | if (!argv[2])
|
---|
| 594 | goto help;
|
---|
| 595 | /* convert to "<applet> --help" */
|
---|
| 596 | argv[0] = argv[2];
|
---|
| 597 | argv[2] = NULL;
|
---|
| 598 | } else {
|
---|
| 599 | /* "busybox <applet> arg1 arg2 ..." */
|
---|
| 600 | argv++;
|
---|
| 601 | }
|
---|
| 602 | /* we want "<argv[0]>: applet not found", not "busybox: ..." */
|
---|
| 603 | applet_name = argv[0];
|
---|
| 604 | run_applet_and_exit(argv[0], argv);
|
---|
| 605 | bb_error_msg_and_die("applet not found");
|
---|
[821] | 606 | }
|
---|
| 607 |
|
---|
[1770] | 608 | void run_current_applet_and_exit(char **argv)
|
---|
[821] | 609 | {
|
---|
[1770] | 610 | int argc = 1;
|
---|
[821] | 611 |
|
---|
[1770] | 612 | while (argv[argc])
|
---|
| 613 | argc++;
|
---|
| 614 |
|
---|
| 615 | /* Reinit some shared global data */
|
---|
| 616 | optind = 1;
|
---|
| 617 | xfunc_error_retval = EXIT_FAILURE;
|
---|
| 618 |
|
---|
| 619 | applet_name = current_applet->name;
|
---|
| 620 | if (argc == 2 && !strcmp(argv[1], "--help"))
|
---|
| 621 | bb_show_usage();
|
---|
| 622 | if (ENABLE_FEATURE_SUID)
|
---|
| 623 | check_suid(current_applet);
|
---|
| 624 | exit(current_applet->main(argc, argv));
|
---|
| 625 | }
|
---|
| 626 |
|
---|
| 627 | void run_applet_and_exit(const char *name, char **argv)
|
---|
| 628 | {
|
---|
| 629 | current_applet = find_applet_by_name(name);
|
---|
| 630 | if (current_applet)
|
---|
| 631 | run_current_applet_and_exit(argv);
|
---|
| 632 | if (!strncmp(name, "busybox", 7))
|
---|
| 633 | exit(busybox_main(argv));
|
---|
| 634 | }
|
---|
| 635 |
|
---|
| 636 |
|
---|
| 637 | #ifdef __GLIBC__
|
---|
| 638 | /* Make it reside in R/W memory: */
|
---|
| 639 | int *const bb_errno __attribute__ ((section (".data")));
|
---|
| 640 | #endif
|
---|
| 641 |
|
---|
| 642 | int main(int argc, char **argv)
|
---|
| 643 | {
|
---|
| 644 | #ifdef __GLIBC__
|
---|
| 645 | (*(int **)&bb_errno) = __errno_location();
|
---|
| 646 | #endif
|
---|
| 647 |
|
---|
| 648 | #if !BB_MMU
|
---|
| 649 | /* NOMMU re-exec trick sets high-order bit in first byte of name */
|
---|
| 650 | if (argv[0][0] & 0x80) {
|
---|
| 651 | re_execed = 1;
|
---|
| 652 | argv[0][0] &= 0x7f;
|
---|
[821] | 653 | }
|
---|
[1770] | 654 | #endif
|
---|
| 655 | applet_name = argv[0];
|
---|
| 656 | if (applet_name[0] == '-')
|
---|
| 657 | applet_name++;
|
---|
| 658 | applet_name = bb_basename(applet_name);
|
---|
| 659 |
|
---|
| 660 | parse_config_file(); /* ...maybe, if FEATURE_SUID_CONFIG */
|
---|
| 661 |
|
---|
| 662 | /* Set locale for everybody except 'init' */
|
---|
| 663 | if (ENABLE_LOCALE_SUPPORT && getpid() != 1)
|
---|
| 664 | setlocale(LC_ALL, "");
|
---|
| 665 |
|
---|
| 666 | run_applet_and_exit(applet_name, argv);
|
---|
| 667 | bb_error_msg_and_die("applet not found");
|
---|
[821] | 668 | }
|
---|