diff options
Diffstat (limited to 'applets/applets.c')
| -rw-r--r-- | applets/applets.c | 237 |
1 files changed, 193 insertions, 44 deletions
diff --git a/applets/applets.c b/applets/applets.c index b4580a5..8acfd95 100644 --- a/applets/applets.c +++ b/applets/applets.c @@ -15,11 +15,6 @@ #include <assert.h> #include "busybox.h" -#define PROTOTYPES -#include "applets.h" -#undef PROTOTYPES - - /* Apparently uclibc defines __GLIBC__ (compat trick?). Oh well. */ #if ENABLE_STATIC && defined(__GLIBC__) && !defined(__UCLIBC__) #warning Static linking against glibc produces buggy executables @@ -30,7 +25,14 @@ #warning from top-level Makefile and remove this warning. #endif + +/* Declare <applet>_main() */ +#define PROTOTYPES +#include "applets.h" +#undef PROTOTYPES + #if ENABLE_SHOW_USAGE && !ENABLE_FEATURE_COMPRESS_USAGE +/* Define usage_messages[] */ static const char usage_messages[] = #define MAKE_USAGE #include "usage.h" @@ -39,24 +41,25 @@ static const char usage_messages[] = #undef MAKE_USAGE #else #define usage_messages 0 -#endif /* ENABLE_SHOW_USAGE */ +#endif /* SHOW_USAGE */ -#undef APPLET -#undef APPLET_NOUSAGE -#undef PROTOTYPES +/* Define struct BB_applet applets[] */ #include "applets.h" +/* The -1 arises because of the {0,NULL,0,-1} entry. */ +const unsigned short NUM_APPLETS = sizeof(applets) / sizeof(struct BB_applet) - 1; -static struct BB_applet *applet_using; -/* The -1 arises because of the {0,NULL,0,-1} entry. */ -const unsigned short NUM_APPLETS = (sizeof(applets) / sizeof(struct BB_applet) - 1); +static struct BB_applet *current_applet; +const char *applet_name ATTRIBUTE_EXTERNALLY_VISIBLE; +#ifdef BB_NOMMU +smallint re_execed; +#endif -#if ENABLE_FEATURE_SUID_CONFIG -#include <ctype.h> +#if ENABLE_FEATURE_SUID_CONFIG -/* applets [] is const, so we have to define this "override" structure */ +/* applets[] is const, so we have to define this "override" structure */ static struct BB_suid_config { struct BB_applet *m_applet; @@ -68,7 +71,7 @@ static struct BB_suid_config struct BB_suid_config *m_next; } *suid_config; -static int suid_cfg_readable; +static smallint suid_cfg_readable; /* check if u is member of group g */ static int ingroup(uid_t u, gid_t g) @@ -101,16 +104,13 @@ static char *get_trimmed_slice(char *s, char *e) break; } } - e[1] = 0; + 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); } - -#define parse_error(x) do { errmsg = x; goto pe_label; } while(0) - /* Don't depend on the tools to combine strings. */ static const char config_file[] = "/etc/busybox.conf"; @@ -121,12 +121,14 @@ static const char mode_chars[] = "Ssx-\0Ssx-\0Ttx-"; * 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[] = { - /* SST sst xxx --- */ + /* 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; @@ -155,7 +157,7 @@ static void parse_config_file(void) sct_head = NULL; section = lc = 0; - do { + while (1) { s = buffer; if (!fgets(s, sizeof(buffer), f)) { /* Are we done? */ @@ -234,7 +236,7 @@ static void parse_config_file(void) /* 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 + * Note: this can hide config file bugs which only pop * up when the busybox configuration is changed. */ applet = find_applet_by_name(s); if (applet) { @@ -266,7 +268,7 @@ static void parse_config_file(void) s = skip_whitespace(e); - /* Note: We require whitespace between the mode and the + /* Note: we require whitespace between the mode and the * user/group info. */ if ((s == e) || !(e = strchr(s, '.'))) { parse_error("<uid>.<gid>"); @@ -308,7 +310,7 @@ static void parse_config_file(void) parse_error("keyword outside section"); } - } while (1); + } /* while (1) */ pe_label: fprintf(stderr, "Parse error in %s, line %d: %s\n", @@ -322,10 +324,10 @@ static void parse_config_file(void) sct_head = sct; } } - #else #define parse_config_file() ((void)0) -#endif /* CONFIG_FEATURE_SUID_CONFIG */ +#endif /* FEATURE_SUID_CONFIG */ + #if ENABLE_FEATURE_SUID static void check_suid(struct BB_applet *applet) @@ -391,9 +393,8 @@ static void check_suid(struct BB_applet *applet) } } #else -#define check_suid(x) -#endif /* CONFIG_FEATURE_SUID */ - +#define check_suid(x) ((void)0) +#endif /* FEATURE_SUID */ #if ENABLE_FEATURE_COMPRESS_USAGE @@ -409,6 +410,7 @@ static const char *unpack_usage_messages(void) if (pipe(input) < 0 || pipe(output) < 0) exit(1); +//TODO: not NOMMU friendly! pid = fork(); switch (pid) { case -1: /* error */ @@ -438,10 +440,10 @@ static const char *unpack_usage_messages(void) full_read(output[0], buf, SIZEOF_usage_messages); return buf; } - #else #define unpack_usage_messages() usage_messages -#endif /* ENABLE_FEATURE_COMPRESS_USAGE */ +#endif /* FEATURE_COMPRESS_USAGE */ + void bb_show_usage(void) { @@ -450,19 +452,23 @@ void bb_show_usage(void) const char *usage_string = unpack_usage_messages(); int i; - for (i = applet_using - applets; i > 0;) - if (!*usage_string++) --i; + i = current_applet - applets; + while (i) { + while (*usage_string++) continue; + i--; + } format_string = "%s\n\nUsage: %s %s\n\n"; if (*usage_string == '\b') format_string = "%s\n\nNo help available.\n\n"; fprintf(stderr, format_string, bb_msg_full_version, - applet_using->name, usage_string); + applet_name, usage_string); } exit(xfunc_error_retval); } + static int applet_name_compare(const void *name, const void *vapplet) { const struct BB_applet *applet = vapplet; @@ -472,25 +478,168 @@ static int applet_name_compare(const void *name, const void *vapplet) struct BB_applet *find_applet_by_name(const char *name) { + /* Do a binary search to find the applet entry given the name. */ return bsearch(name, applets, NUM_APPLETS, sizeof(struct BB_applet), applet_name_compare); } -void run_applet_by_name(const char *name, int argc, char **argv) + +#if ENABLE_FEATURE_INSTALLER +/* + * directory table + * this should be consistent w/ the enum, busybox.h::Location, + * or else... + */ +static const char usr_bin [] = "/usr/bin"; +static const char usr_sbin[] = "/usr/sbin"; + +static const char *const install_dir[] = { + &usr_bin [8], /* "", equivalent to "/" for concat_path_file() */ + &usr_bin [4], /* "/bin" */ + &usr_sbin[4], /* "/sbin" */ + usr_bin, + usr_sbin +}; + +/* create (sym)links for each applet */ +static void install_links(const char *busybox, int use_symbolic_links) { - if (ENABLE_FEATURE_SUID_CONFIG) - parse_config_file(); + int (*lf)(const char *, const char *) = link; + char *fpc; + int i; + int rc; + + if (use_symbolic_links) + lf = symlink; + + for (i = 0; applets[i].name != NULL; i++) { + fpc = concat_path_file( + install_dir[applets[i].location], + applets[i].name); + rc = lf(busybox, fpc); + if (rc != 0 && errno != EEXIST) { + bb_perror_msg("%s", fpc); + } + free(fpc); + } +} +#else +#define install_links(x,y) ((void)0) +#endif /* FEATURE_INSTALLER */ - /* Do a binary search to find the applet entry given the name. */ - applet_using = find_applet_by_name(name); - if (applet_using) { - applet_name = applet_using->name; + +/* If we were called as "busybox..." */ +static int busybox_main(int argc, char **argv) +{ + if (ENABLE_FEATURE_INSTALLER && argc > 1 && !strcmp(argv[1], "--install")) { + int use_symbolic_links = 0; + char *busybox; + + /* to use symlinks, or not to use symlinks... */ + if (argc > 2) + if (strcmp(argv[2], "-s") == 0) + use_symbolic_links = 1; + + /* link */ + busybox = xmalloc_readlink_or_warn("/proc/self/exe"); + if (!busybox) + return 1; + install_links(busybox, use_symbolic_links); + if (ENABLE_FEATURE_CLEAN_UP) + free(busybox); + return 0; + } + + /* Deal with --help. Also print help when called with no arguments */ + + if (argc == 1 || !strcmp(argv[1], "--help") ) { + if (argc > 2) { + /* set name for proper "<name>: applet not found" */ + applet_name = argv[2]; + run_applet_by_name(applet_name, 2, argv); + } else { + const struct BB_applet *a; + int col, output_width; + + output_width = 80 - sizeof("start-stop-daemon, ") - 8; + if (ENABLE_FEATURE_AUTOWIDTH) { + /* Obtain the terminal width. */ + get_terminal_width_height(0, &output_width, NULL); + /* leading tab and room to wrap */ + output_width -= sizeof("start-stop-daemon, ") + 8; + } + + printf("%s\n" + "Copyright (C) 1998-2006 Erik Andersen, Rob Landley, and others.\n" + "Licensed under GPLv2. See source distribution for full notice.\n" + "\n" + "Usage: busybox [function] [arguments]...\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" + "\nCurrently defined functions:\n", bb_msg_full_version); + col = 0; + a = applets; + while (a->name) { + col += printf("%s%s", (col ? ", " : "\t"), a->name); + a++; + if (col > output_width && a->name) { + puts(","); + col = 0; + } + } + puts("\n"); + return 0; + } + } else run_applet_by_name(argv[1], argc - 1, argv + 1); + + bb_error_msg_and_die("applet not found"); +} + +void run_applet_by_name(const char *name, int argc, char **argv) +{ + current_applet = find_applet_by_name(name); + if (current_applet) { + applet_name = current_applet->name; if (argc == 2 && !strcmp(argv[1], "--help")) bb_show_usage(); if (ENABLE_FEATURE_SUID) - check_suid(applet_using); - exit(applet_using->main(argc, argv)); + check_suid(current_applet); + exit(current_applet->main(argc, argv)); } if (!strncmp(name, "busybox", 7)) exit(busybox_main(argc, argv)); } + + +int main(int argc, char **argv) +{ + const char *s; + + applet_name = argv[0]; +#ifdef BB_NOMMU + /* NOMMU re-exec trick sets high-order bit in first byte of name */ + if (applet_name[0] & 0x80) { + re_execed = 1; + applet_name[0] &= 0x7f; + } +#endif + if (applet_name[0] == '-') + applet_name++; + s = strrchr(applet_name, '/'); + if (s) + applet_name = s + 1; + + if (ENABLE_FEATURE_SUID_CONFIG) + parse_config_file(); + + /* Set locale for everybody except 'init' */ + if (ENABLE_LOCALE_SUPPORT && getpid() != 1) + setlocale(LC_ALL, ""); + + run_applet_by_name(applet_name, argc, argv); + bb_error_msg_and_die("applet not found"); +} |