X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=libbb%2Fappletlib.c;h=b32ff8808ca1a120ead2efd0cb92e2e079073831;hb=70186711f45816bdf4562831af3bd995172eb47b;hp=565dacf36d7ec0956005f19dc05dbab6561335c8;hpb=d419a9f83059f0807b82cdbc7be8e3e8f343707e;p=oweals%2Fbusybox.git diff --git a/libbb/appletlib.c b/libbb/appletlib.c index 565dacf36..b32ff8808 100644 --- a/libbb/appletlib.c +++ b/libbb/appletlib.c @@ -1,15 +1,41 @@ /* vi: set sw=4 ts=4: */ /* - * Support for main() which needs to end up in libbusybox, not busybox, - * if one builds libbusybox. + * Utility routines. * - * Copyright (C) 2007 Denys Vlasenko + * Copyright (C) tons of folks. Tracking down who wrote what + * isn't something I'm going to worry about... If you wrote something + * here, please feel free to acknowledge your work. * - * Licensed under GPLv2, see file License in this tarball for details. + * Based in part on code from sash, Copyright (c) 1999 by David I. Bell + * Permission has been granted to redistribute this code under GPL. + * + * Licensed under GPLv2 or later, see file LICENSE in this source tree. */ -#include +/* We are trying to not use printf, this benefits the case when selected + * applets are really simple. Example: + * + * $ ./busybox + * ... + * Currently defined functions: + * basename, false, true + * + * $ size busybox + * text data bss dec hex filename + * 4473 52 72 4597 11f5 busybox + * + * FEATURE_INSTALLER or FEATURE_SUID will still link printf routines in. :( + */ #include "busybox.h" +#include +#include +/* Try to pull in PAGE_SIZE */ +#ifdef __linux__ +# include +#endif +#ifdef __GNU__ /* Hurd */ +# include +#endif /* Declare _main() */ @@ -17,32 +43,30 @@ #include "applets.h" #undef PROTOTYPES -#if ENABLE_SHOW_USAGE && !ENABLE_FEATURE_COMPRESS_USAGE -/* Define usage_messages[] */ -static const char usage_messages[] ALIGN1 = "" -#define MAKE_USAGE -#include "usage.h" -#include "applets.h" -; -#undef MAKE_USAGE -#else -#define usage_messages 0 -#endif /* SHOW_USAGE */ -/* Define struct bb_applet applets[] */ -#include "applets.h" - -#if ENABLE_FEATURE_SH_STANDALONE -/* -1 because last entry is NULL */ -const unsigned short NUM_APPLETS = ARRAY_SIZE(applets) - 1; +/* Include generated applet names, pointers to _main, etc */ +#include "applet_tables.h" +/* ...and if applet_tables generator says we have only one applet... */ +#ifdef SINGLE_APPLET_MAIN +# undef ENABLE_FEATURE_INDIVIDUAL +# define ENABLE_FEATURE_INDIVIDUAL 1 +# undef IF_FEATURE_INDIVIDUAL +# define IF_FEATURE_INDIVIDUAL(...) __VA_ARGS__ #endif -#if ENABLE_FEATURE_COMPRESS_USAGE - #include "usage_compressed.h" -#include "unarchive.h" +#if ENABLE_SHOW_USAGE && !ENABLE_FEATURE_COMPRESS_USAGE +static const char usage_messages[] ALIGN1 = UNPACKED_USAGE; +#else +# define usage_messages 0 +#endif + +#if ENABLE_FEATURE_COMPRESS_USAGE + +static const char packed_usage[] ALIGN1 = { PACKED_USAGE }; +# include "unarchive.h" static const char *unpack_usage_messages(void) { char *outbuf = NULL; @@ -51,89 +75,762 @@ static const char *unpack_usage_messages(void) i = start_bunzip(&bd, /* src_fd: */ -1, - /* inbuf: */ packed_usage, + /* inbuf: */ (void *)packed_usage, /* len: */ sizeof(packed_usage)); /* read_bunzip can longjmp to start_bunzip, and ultimately * end up here with i != 0 on read data errors! Not trivial */ if (!i) { /* Cannot use xmalloc: will leak bd in NOFORK case! */ - outbuf = malloc_or_warn(SIZEOF_usage_messages); + outbuf = malloc_or_warn(sizeof(UNPACKED_USAGE)); if (outbuf) - read_bunzip(bd, outbuf, SIZEOF_usage_messages); + read_bunzip(bd, outbuf, sizeof(UNPACKED_USAGE)); } dealloc_bunzip(bd); return outbuf; } -#define dealloc_usage_messages(s) free(s) +# define dealloc_usage_messages(s) free(s) #else -#define unpack_usage_messages() usage_messages -#define dealloc_usage_messages(s) ((void)(s)) +# define unpack_usage_messages() usage_messages +# define dealloc_usage_messages(s) ((void)(s)) #endif /* FEATURE_COMPRESS_USAGE */ -void bb_show_usage(void) +void FAST_FUNC bb_show_usage(void) { if (ENABLE_SHOW_USAGE) { - const char *format_string; +#ifdef SINGLE_APPLET_STR + /* Imagine that this applet is "true". Dont suck in printf! */ const char *p; const char *usage_string = p = unpack_usage_messages(); - const struct bb_applet *ap = find_applet_by_name(applet_name); - int i; - if (!ap) /* never happens, paranoia */ - xfunc_die(); + if (*p == '\b') { + full_write2_str("No help available.\n\n"); + } else { + full_write2_str("Usage: "SINGLE_APPLET_STR" "); + full_write2_str(p); + full_write2_str("\n\n"); + } + if (ENABLE_FEATURE_CLEAN_UP) + dealloc_usage_messages((char*)usage_string); +#else + const char *p; + const char *usage_string = p = unpack_usage_messages(); + int ap = find_applet_by_name(applet_name); - i = ap - applets; - while (i) { + if (ap < 0) /* never happens, paranoia */ + xfunc_die(); + while (ap) { while (*p++) continue; - i--; + ap--; } - - fprintf(stderr, "%s multi-call binary\n", bb_banner); - format_string = "\nUsage: %s %s\n\n"; + full_write2_str(bb_banner); + full_write2_str(" multi-call binary.\n"); if (*p == '\b') - format_string = "\nNo help available.\n\n"; - fprintf(stderr, format_string, applet_name, p); - dealloc_usage_messages((char*)usage_string); + full_write2_str("\nNo help available.\n\n"); + else { + full_write2_str("\nUsage: "); + full_write2_str(applet_name); + full_write2_str(" "); + full_write2_str(p); + full_write2_str("\n\n"); + } + if (ENABLE_FEATURE_CLEAN_UP) + dealloc_usage_messages((char*)usage_string); +#endif } xfunc_die(); } - -static int applet_name_compare(const void *name, const void *vapplet) +#if NUM_APPLETS > 8 +/* NB: any char pointer will work as well, not necessarily applet_names */ +static int applet_name_compare(const void *name, const void *v) { - const struct bb_applet *applet = vapplet; - - return strcmp(name, applet->name); + int i = (const char *)v - applet_names; + return strcmp(name, APPLET_NAME(i)); } - -const struct bb_applet *find_applet_by_name(const char *name) +#endif +int FAST_FUNC find_applet_by_name(const char *name) { +#if NUM_APPLETS > 8 /* Do a binary search to find the applet entry given the name. */ - return bsearch(name, applets, ARRAY_SIZE(applets)-1, sizeof(applets[0]), - applet_name_compare); + const char *p; + p = bsearch(name, applet_names, ARRAY_SIZE(applet_main), 1, applet_name_compare); + if (!p) + return -1; + return p - applet_names; +#else + /* A version which does not pull in bsearch */ + int i = 0; + const char *p = applet_names; + while (i < NUM_APPLETS) { + if (strcmp(name, p) == 0) + return i; + p += strlen(p) + 1; + i++; + } + return -1; +#endif } -#ifdef __GLIBC__ -/* Make it reside in R/W memory: */ -int *const bb_errno __attribute__ ((section (".data"))); -#endif - -void bbox_prepare_main(char **argv) +void lbb_prepare(const char *applet + IF_FEATURE_INDIVIDUAL(, char **argv)) + MAIN_EXTERNALLY_VISIBLE; +void lbb_prepare(const char *applet + IF_FEATURE_INDIVIDUAL(, char **argv)) { #ifdef __GLIBC__ (*(int **)&bb_errno) = __errno_location(); + barrier(); #endif + applet_name = applet; /* Set locale for everybody except 'init' */ if (ENABLE_LOCALE_SUPPORT && getpid() != 1) setlocale(LC_ALL, ""); - /* Redundant for busybox, but needed for individual applets */ - if (argv[1] && strcmp(argv[1], "--help") == 0) - bb_show_usage(); +#if ENABLE_FEATURE_INDIVIDUAL + /* Redundant for busybox (run_applet_and_exit covers that case) + * but needed for "individual applet" mode */ + if (argv[1] + && !argv[2] + && strcmp(argv[1], "--help") == 0 + && strncmp(applet, "busybox", 7) != 0 + ) { + /* Special case. POSIX says "test --help" + * should be no different from e.g. "test --foo". */ + if (!ENABLE_TEST || strcmp(applet_name, "test") != 0) + bb_show_usage(); + } +#endif +} + +/* The code below can well be in applets/applets.c, as it is used only + * for busybox binary, not "individual" binaries. + * However, keeping it here and linking it into libbusybox.so + * (together with remaining tiny applets/applets.o) + * makes it possible to avoid --whole-archive at link time. + * This makes (shared busybox) + libbusybox smaller. + * (--gc-sections would be even better....) + */ + +const char *applet_name; +#if !BB_MMU +bool re_execed; +#endif + + +/* If not built as a single-applet executable... */ +#if !defined(SINGLE_APPLET_MAIN) + +IF_FEATURE_SUID(static uid_t ruid;) /* real uid */ + +#if ENABLE_FEATURE_SUID_CONFIG + +/* applets[] is const, so we have to define this "override" structure */ +static struct BB_suid_config { + int m_applet; + uid_t m_uid; + gid_t m_gid; + mode_t m_mode; + struct BB_suid_config *m_next; +} *suid_config; + +static bool suid_cfg_readable; + +/* check if u is member of group g */ +static int ingroup(uid_t u, gid_t g) +{ + struct group *grp = getgrgid(g); + + if (grp) { + char **mem; + + for (mem = grp->gr_mem; *mem; mem++) { + struct passwd *pwd = getpwnam(*mem); + + if (pwd && (pwd->pw_uid == u)) + return 1; + } + } + return 0; +} + +/* This should probably be a libbb routine. In that case, + * I'd probably rename it to something like bb_trimmed_slice. + */ +static char *get_trimmed_slice(char *s, char *e) +{ + /* First, consider the value at e to be nul and back up until we + * reach a non-space char. Set the char after that (possibly at + * the original e) to nul. */ + while (e-- > s) { + if (!isspace(*e)) { + break; + } + } + e[1] = '\0'; + + /* Next, advance past all leading space and return a ptr to the + * first non-space char; possibly the terminating nul. */ + return skip_whitespace(s); +} + +/* Don't depend on the tools to combine strings. */ +static const char config_file[] ALIGN1 = "/etc/busybox.conf"; + +/* We don't supply a value for the nul, so an index adjustment is + * necessary below. Also, we use unsigned short here to save some + * space even though these are really mode_t values. */ +static const unsigned short mode_mask[] ALIGN2 = { + /* SST sst xxx --- */ + S_ISUID, S_ISUID|S_IXUSR, S_IXUSR, 0, /* user */ + S_ISGID, S_ISGID|S_IXGRP, S_IXGRP, 0, /* group */ + 0, S_IXOTH, S_IXOTH, 0 /* other */ +}; + +#define parse_error(x) do { errmsg = x; goto pe_label; } while (0) + +static void parse_config_file(void) +{ + struct BB_suid_config *sct_head; + struct BB_suid_config *sct; + int applet_no; + FILE *f; + const char *errmsg; + char *s; + char *e; + int i; + unsigned lc; + smallint section; + char buffer[256]; + struct stat st; + + assert(!suid_config); /* Should be set to NULL by bss init. */ + + ruid = getuid(); + if (ruid == 0) /* run by root - don't need to even read config file */ + return; + + if ((stat(config_file, &st) != 0) /* No config file? */ + || !S_ISREG(st.st_mode) /* Not a regular file? */ + || (st.st_uid != 0) /* Not owned by root? */ + || (st.st_mode & (S_IWGRP | S_IWOTH)) /* Writable by non-root? */ + || !(f = fopen_for_read(config_file)) /* Cannot open? */ + ) { + return; + } + + suid_cfg_readable = 1; + sct_head = NULL; + section = lc = 0; + + while (1) { + s = buffer; + + if (!fgets(s, sizeof(buffer), f)) { /* Are we done? */ +// why? + if (ferror(f)) { /* Make sure it wasn't a read error. */ + parse_error("reading"); + } + fclose(f); + suid_config = sct_head; /* Success, so set the pointer. */ + return; + } + + lc++; /* Got a (partial) line. */ + + /* If a line is too long for our buffer, we consider it an error. + * The following test does mistreat one corner case though. + * If the final line of the file does not end with a newline and + * yet exactly fills the buffer, it will be treated as too long + * even though there isn't really a problem. But it isn't really + * worth adding code to deal with such an unlikely situation, and + * we do err on the side of caution. Besides, the line would be + * too long if it did end with a newline. */ + if (!strchr(s, '\n') && !feof(f)) { + parse_error("line too long"); + } + + /* Trim leading and trailing whitespace, ignoring comments, and + * check if the resulting string is empty. */ + s = get_trimmed_slice(s, strchrnul(s, '#')); + if (!*s) { + continue; + } + + /* Check for a section header. */ + + if (*s == '[') { + /* Unlike the old code, we ignore leading and trailing + * whitespace for the section name. We also require that + * there are no stray characters after the closing bracket. */ + e = strchr(s, ']'); + if (!e /* Missing right bracket? */ + || e[1] /* Trailing characters? */ + || !*(s = get_trimmed_slice(s+1, e)) /* Missing name? */ + ) { + parse_error("section header"); + } + /* Right now we only have one section so just check it. + * If more sections are added in the future, please don't + * resort to cascading ifs with multiple strcasecmp calls. + * That kind of bloated code is all too common. A loop + * and a string table would be a better choice unless the + * number of sections is very small. */ + if (strcasecmp(s, "SUID") == 0) { + section = 1; + continue; + } + section = -1; /* Unknown section so set to skip. */ + continue; + } + + /* Process sections. */ + + if (section == 1) { /* SUID */ + /* Since we trimmed leading and trailing space above, we're + * now looking for strings of the form + * [::space::]*=[::space::]* + * where both key and value could contain inner whitespace. */ + + /* First get the key (an applet name in our case). */ + e = strchr(s, '='); + if (e) { + s = get_trimmed_slice(s, e); + } + if (!e || !*s) { /* Missing '=' or empty key. */ + parse_error("keyword"); + } + + /* Ok, we have an applet name. Process the rhs if this + * applet is currently built in and ignore it otherwise. + * Note: this can hide config file bugs which only pop + * up when the busybox configuration is changed. */ + applet_no = find_applet_by_name(s); + if (applet_no >= 0) { + /* Note: We currently don't check for duplicates! + * The last config line for each applet will be the + * one used since we insert at the head of the list. + * I suppose this could be considered a feature. */ + sct = xmalloc(sizeof(struct BB_suid_config)); + sct->m_applet = applet_no; + sct->m_mode = 0; + sct->m_next = sct_head; + sct_head = sct; + + /* Get the specified mode. */ + + e = skip_whitespace(e+1); + + for (i = 0; i < 3; i++) { + /* There are 4 chars + 1 nul for each of user/group/other. */ + static const char mode_chars[] ALIGN1 = "Ssx-\0" "Ssx-\0" "Ttx-"; + + const char *q; + q = strchrnul(mode_chars + 5*i, *e++); + if (!*q) { + parse_error("mode"); + } + /* Adjust by -i to account for nul. */ + sct->m_mode |= mode_mask[(q - mode_chars) - i]; + } + + /* Now get the the user/group info. */ + + s = skip_whitespace(e); + + /* Note: we require whitespace between the mode and the + * user/group info. */ + if ((s == e) || !(e = strchr(s, '.'))) { + parse_error("."); + } + *e++ = '\0'; + + /* We can't use get_ug_id here since it would exit() + * if a uid or gid was not found. Oh well... */ + sct->m_uid = bb_strtoul(s, NULL, 10); + if (errno) { + struct passwd *pwd = getpwnam(s); + if (!pwd) { + parse_error("user"); + } + sct->m_uid = pwd->pw_uid; + } + + sct->m_gid = bb_strtoul(e, NULL, 10); + if (errno) { + struct group *grp; + grp = getgrnam(e); + if (!grp) { + parse_error("group"); + } + sct->m_gid = grp->gr_gid; + } + } + continue; + } + + /* Unknown sections are ignored. */ + + /* Encountering configuration lines prior to seeing a + * section header is treated as an error. This is how + * the old code worked, but it may not be desirable. + * We may want to simply ignore such lines in case they + * are used in some future version of busybox. */ + if (!section) { + parse_error("keyword outside section"); + } + + } /* while (1) */ + + pe_label: + fprintf(stderr, "Parse error in %s, line %d: %s\n", + config_file, lc, errmsg); + + fclose(f); + /* Release any allocated memory before returning. */ + while (sct_head) { + sct = sct_head->m_next; + free(sct_head); + sct_head = sct; + } +} +#else +static inline void parse_config_file(void) +{ + IF_FEATURE_SUID(ruid = getuid();) +} +#endif /* FEATURE_SUID_CONFIG */ + + +#if ENABLE_FEATURE_SUID +static void check_suid(int applet_no) +{ + gid_t rgid; /* real gid */ + + if (ruid == 0) /* set by parse_config_file() */ + return; /* run by root - no need to check more */ + rgid = getgid(); + +#if ENABLE_FEATURE_SUID_CONFIG + if (suid_cfg_readable) { + uid_t uid; + struct BB_suid_config *sct; + mode_t m; + + for (sct = suid_config; sct; sct = sct->m_next) { + if (sct->m_applet == applet_no) + goto found; + } + goto check_need_suid; + found: + m = sct->m_mode; + if (sct->m_uid == ruid) + /* same uid */ + m >>= 6; + else if ((sct->m_gid == rgid) || ingroup(ruid, sct->m_gid)) + /* same group / in group */ + m >>= 3; + + if (!(m & S_IXOTH)) /* is x bit not set ? */ + bb_error_msg_and_die("you have no permission to run this applet!"); + + /* _both_ sgid and group_exec have to be set for setegid */ + if ((sct->m_mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) + rgid = sct->m_gid; + /* else (no setegid) we will set egid = rgid */ + + /* We set effective AND saved ids. If saved-id is not set + * like we do below, seteiud(0) can still later succeed! */ + if (setresgid(-1, rgid, rgid)) + bb_perror_msg_and_die("setresgid"); + + /* do we have to set effective uid? */ + uid = ruid; + if (sct->m_mode & S_ISUID) + uid = sct->m_uid; + /* else (no seteuid) we will set euid = ruid */ + + if (setresuid(-1, uid, uid)) + bb_perror_msg_and_die("setresuid"); + return; + } +#if !ENABLE_FEATURE_SUID_CONFIG_QUIET + { + static bool onetime = 0; + + if (!onetime) { + onetime = 1; + fprintf(stderr, "Using fallback suid method\n"); + } + } +#endif + check_need_suid: +#endif + if (APPLET_SUID(applet_no) == _BB_SUID_REQUIRE) { + /* Real uid is not 0. If euid isn't 0 too, suid bit + * is most probably not set on our executable */ + if (geteuid()) + bb_error_msg_and_die("must be suid to work properly"); + } else if (APPLET_SUID(applet_no) == _BB_SUID_DROP) { + xsetgid(rgid); /* drop all privileges */ + xsetuid(ruid); + } +} +#else +#define check_suid(x) ((void)0) +#endif /* FEATURE_SUID */ + + +#if ENABLE_FEATURE_INSTALLER +static const char usr_bin [] ALIGN1 = "/usr/bin/"; +static const char usr_sbin[] ALIGN1 = "/usr/sbin/"; +static const char *const install_dir[] = { + &usr_bin [8], /* "/" */ + &usr_bin [4], /* "/bin/" */ + &usr_sbin[4] /* "/sbin/" */ +# if !ENABLE_INSTALL_NO_USR + ,usr_bin + ,usr_sbin +# endif +}; + + +/* create (sym)links for each applet */ +static void install_links(const char *busybox, int use_symbolic_links, + char *custom_install_dir) +{ + /* directory table + * this should be consistent w/ the enum, + * busybox.h::bb_install_loc_t, or else... */ + int (*lf)(const char *, const char *); + char *fpc; + unsigned i; + int rc; + + lf = link; + if (use_symbolic_links) + lf = symlink; + + for (i = 0; i < ARRAY_SIZE(applet_main); i++) { + fpc = concat_path_file( + custom_install_dir ? custom_install_dir : install_dir[APPLET_INSTALL_LOC(i)], + APPLET_NAME(i)); + // debug: bb_error_msg("%slinking %s to busybox", + // use_symbolic_links ? "sym" : "", fpc); + rc = lf(busybox, fpc); + if (rc != 0 && errno != EEXIST) { + bb_simple_perror_msg(fpc); + } + free(fpc); + } +} +#else +# define install_links(x,y,z) ((void)0) +#endif + +/* If we were called as "busybox..." */ +static int busybox_main(char **argv) +{ + if (!argv[1]) { + /* Called without arguments */ + const char *a; + int col; + unsigned output_width; + help: + output_width = 80; + if (ENABLE_FEATURE_AUTOWIDTH) { + /* Obtain the terminal width */ + get_terminal_width_height(0, &output_width, NULL); + } + + dup2(1, 2); + full_write2_str(bb_banner); /* reuse const string */ + full_write2_str(" multi-call binary.\n"); /* reuse */ + full_write2_str( + "Copyright (C) 1998-2009 Erik Andersen, Rob Landley, Denys Vlasenko\n" + "and others. Licensed under GPLv2.\n" + "See source distribution for full notice.\n" + "\n" + "Usage: busybox [function] [arguments]...\n" + " or: busybox --list[-full]\n" + " or: function [arguments]...\n" + "\n" + "\tBusyBox is a multi-call binary that combines many common Unix\n" + "\tutilities into a single executable. Most people will create a\n" + "\tlink to busybox for each function they wish to use and BusyBox\n" + "\twill act like whatever it was invoked as.\n" + "\n" + "Currently defined functions:\n" + ); + col = 0; + a = applet_names; + /* prevent last comma to be in the very last pos */ + output_width--; + while (*a) { + int len2 = strlen(a) + 2; + if (col >= (int)output_width - len2) { + full_write2_str(",\n"); + col = 0; + } + if (col == 0) { + col = 6; + full_write2_str("\t"); + } else { + full_write2_str(", "); + } + full_write2_str(a); + col += len2; + a += len2 - 1; + } + full_write2_str("\n\n"); + return 0; + } + + if (strncmp(argv[1], "--list", 6) == 0) { + unsigned i = 0; + const char *a = applet_names; + dup2(1, 2); + while (*a) { +#if ENABLE_FEATURE_INSTALLER + if (argv[1][6]) /* --list-path? */ + full_write2_str(install_dir[APPLET_INSTALL_LOC(i)] + 1); +#endif + full_write2_str(a); + full_write2_str("\n"); + i++; + a += strlen(a) + 1; + } + return 0; + } + + if (ENABLE_FEATURE_INSTALLER && strcmp(argv[1], "--install") == 0) { + int use_symbolic_links; + const char *busybox; + busybox = xmalloc_readlink(bb_busybox_exec_path); + if (!busybox) + busybox = bb_busybox_exec_path; + /* busybox --install [-s] [DIR]: */ + /* -s: make symlinks */ + /* DIR: directory to install links to */ + use_symbolic_links = (argv[2] && strcmp(argv[2], "-s") == 0 && argv++); + install_links(busybox, use_symbolic_links, argv[2]); + return 0; + } + + if (strcmp(argv[1], "--help") == 0) { + /* "busybox --help []" */ + if (!argv[2]) + goto help; + /* convert to " --help" */ + argv[0] = argv[2]; + argv[2] = NULL; + } else { + /* "busybox arg1 arg2 ..." */ + argv++; + } + /* We support "busybox /a/path/to/applet args..." too. Allows for + * "#!/bin/busybox"-style wrappers */ + applet_name = bb_get_last_path_component_nostrip(argv[0]); + run_applet_and_exit(applet_name, argv); + + /*bb_error_msg_and_die("applet not found"); - sucks in printf */ + full_write2_str(applet_name); + full_write2_str(": applet not found\n"); + xfunc_die(); +} + +void FAST_FUNC run_applet_no_and_exit(int applet_no, char **argv) +{ + int argc = 1; + + while (argv[argc]) + argc++; + + /* Reinit some shared global data */ + xfunc_error_retval = EXIT_FAILURE; + + applet_name = APPLET_NAME(applet_no); + if (argc == 2 && strcmp(argv[1], "--help") == 0) { + /* Special case. POSIX says "test --help" + * should be no different from e.g. "test --foo". */ +//TODO: just compare applet_no with APPLET_NO_test + if (!ENABLE_TEST || strcmp(applet_name, "test") != 0) + bb_show_usage(); + } + if (ENABLE_FEATURE_SUID) + check_suid(applet_no); + exit(applet_main[applet_no](argc, argv)); +} + +void FAST_FUNC run_applet_and_exit(const char *name, char **argv) +{ + int applet = find_applet_by_name(name); + if (applet >= 0) + run_applet_no_and_exit(applet, argv); + if (!strncmp(name, "busybox", 7)) + exit(busybox_main(argv)); +} + +#endif /* !defined(SINGLE_APPLET_MAIN) */ + + + +#if ENABLE_BUILD_LIBBUSYBOX +int lbb_main(char **argv) +#else +int main(int argc UNUSED_PARAM, char **argv) +#endif +{ + /* Tweak malloc for reduced memory consumption */ +#ifndef PAGE_SIZE +# define PAGE_SIZE (4*1024) /* guess */ +#endif +#ifdef M_TRIM_THRESHOLD + /* M_TRIM_THRESHOLD is the maximum amount of freed top-most memory + * to keep before releasing to the OS + * Default is way too big: 256k + */ + mallopt(M_TRIM_THRESHOLD, 2 * PAGE_SIZE); +#endif +#ifdef M_MMAP_THRESHOLD + /* M_MMAP_THRESHOLD is the request size threshold for using mmap() + * Default is too big: 256k + */ + mallopt(M_MMAP_THRESHOLD, 8 * PAGE_SIZE - 256); +#endif + +#if defined(SINGLE_APPLET_MAIN) + /* Only one applet is selected by the user! */ + /* applet_names in this case is just "applet\0\0" */ + lbb_prepare(applet_names IF_FEATURE_INDIVIDUAL(, argv)); + return SINGLE_APPLET_MAIN(argc, argv); +#else + lbb_prepare("busybox" IF_FEATURE_INDIVIDUAL(, argv)); + +#if !BB_MMU + /* NOMMU re-exec trick sets high-order bit in first byte of name */ + if (argv[0][0] & 0x80) { + re_execed = 1; + argv[0][0] &= 0x7f; + } +#endif + applet_name = argv[0]; + if (applet_name[0] == '-') + applet_name++; + applet_name = bb_basename(applet_name); + + parse_config_file(); /* ...maybe, if FEATURE_SUID_CONFIG */ + + run_applet_and_exit(applet_name, argv); + + /*bb_error_msg_and_die("applet not found"); - sucks in printf */ + full_write2_str(applet_name); + full_write2_str(": applet not found\n"); + xfunc_die(); +#endif }