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https://github.com/sheumann/hush.git
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*: intrduce and use safe_gethostname. By Tito <farmatito AT tiscali.it>
safe_gethostname - 48 +48 glob3 35 37 +2 timestamp_and_log 314 315 +1 udhcp_send_kernel_packet 234 231 -3 scan_tree 275 271 -4 passwd_main 1074 1070 -4 print_login_prompt 68 58 -10 obscure 392 377 -15 syslogd_main 882 866 -16 print_login_issue 516 478 -38 hostname_main 278 223 -55 parse_and_put_prompt 825 756 -69 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 2/9 up/down: 51/-214) Total: -163 bytes text data bss dec hex filename 798791 728 7484 807003 c505b busybox_old 798631 728 7484 806843 c4fbb busybox_unstripped
This commit is contained in:
Denis Vlasenko
parent
394eebed66
commit
6f1713f216
@ -550,6 +550,8 @@ extern FILE *fopen_or_warn_stdin(const char *filename);
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* If this is a problem, use bare poll and open-code EINTR/ENOMEM handling */
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int safe_poll(struct pollfd *ufds, nfds_t nfds, int timeout_ms);
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char *safe_gethostname(void);
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/* Convert each alpha char in str to lower-case */
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char* str_tolower(char *str);
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@ -73,6 +73,7 @@ lib-y += recursive_action.o
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lib-y += remove_file.o
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lib-y += restricted_shell.o
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lib-y += run_shell.o
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lib-y += safe_gethostname.o
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lib-y += safe_poll.o
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lib-y += safe_strncpy.o
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lib-y += safe_write.o
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@ -1203,11 +1203,7 @@ static void parse_and_put_prompt(const char *prmt_ptr)
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break;
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#endif
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case 'h':
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pbuf = free_me = xzalloc(256);
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if (gethostname(pbuf, 255) < 0) {
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pbuf[0] = '?';
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pbuf[1] = '\0';
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}
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pbuf = free_me = safe_gethostname();
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*strchrnul(pbuf, '.') = '\0';
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break;
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case '$':
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@ -50,6 +50,7 @@ void print_login_issue(const char *issue_file, const char *tty)
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outbuf = uts.sysname;
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break;
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case 'n':
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case 'h':
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outbuf = uts.nodename;
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break;
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case 'r':
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@ -72,10 +73,6 @@ void print_login_issue(const char *issue_file, const char *tty)
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case 't':
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strftime(buf, sizeof(buf), fmtstr_t, localtime(&t));
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break;
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case 'h':
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gethostname(buf, sizeof(buf) - 1);
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buf[sizeof(buf) - 1] = '\0';
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break;
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case 'l':
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outbuf = tty;
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break;
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@ -91,13 +88,12 @@ void print_login_issue(const char *issue_file, const char *tty)
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void print_login_prompt(void)
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{
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char buf[MAXHOSTNAMELEN+1];
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if (gethostname(buf, MAXHOSTNAMELEN) == 0)
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fputs(buf, stdout);
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char *hostname = safe_gethostname();
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fputs(hostname, stdout);
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fputs(LOGIN, stdout);
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fflush(stdout);
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free(hostname);
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}
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/* Clear dangerous stuff, set PATH */
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@ -93,7 +93,7 @@ static const char *obscure_msg(const char *old_p, const char *new_p, const struc
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/* Add 2 for each type of characters to the minlen of password */
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int size = CONFIG_PASSWORD_MINLEN + 8;
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const char *p;
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char hostname[255];
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char *hostname;
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/* size */
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if (!new_p || (length = strlen(new_p)) < CONFIG_PASSWORD_MINLEN)
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@ -108,12 +108,11 @@ static const char *obscure_msg(const char *old_p, const char *new_p, const struc
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return "similar to gecos";
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}
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/* hostname as-is, as sub-string, reversed, capitalized, doubled */
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if (gethostname(hostname, 255) == 0) {
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hostname[254] = '\0';
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if (string_checker(new_p, hostname)) {
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return "similar to hostname";
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}
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}
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hostname = safe_gethostname();
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i = string_checker(new_p, hostname);
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free(hostname);
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if (i)
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return "similar to hostname";
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/* Should / Must contain a mix of: */
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for (i = 0; i < length; i++) {
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@ -1133,8 +1133,8 @@ static void signal_handler(int sig)
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static const char *get_variable(const char *variable, void *info)
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{
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static char sbuf[sizeof(int)*3 + 2]; /* sign and NUL */
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static char *hostname;
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char hostname[STRING_LENGTH];
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struct get_variable_info *gv_info = info;
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const char *field_names[] = {
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"hostname", "mntpt", "devpath", "devname",
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@ -1143,12 +1143,8 @@ static const char *get_variable(const char *variable, void *info)
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};
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int i;
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if (gethostname(hostname, STRING_LENGTH - 1) != 0)
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/* Here on error we should do exit(RV_SYS_ERROR), instead we do exit(EXIT_FAILURE) */
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error_logger_and_die(LOG_ERR, "gethostname");
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hostname[STRING_LENGTH - 1] = '\0';
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if (!hostname)
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hostname = safe_gethostname();
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/* index_in_str_array returns i>=0 */
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i = index_in_str_array(field_names, variable);
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@ -24,8 +24,7 @@ static void do_sethostname(char *s, int isfile)
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if (sethostname(s, strlen(s)) < 0) {
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if (errno == EPERM)
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bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
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else
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bb_perror_msg_and_die("sethostname");
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bb_perror_msg_and_die("sethostname");
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}
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} else {
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f = xfopen(s, "r");
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@ -54,27 +53,27 @@ int hostname_main(int argc, char **argv)
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OPT_dfis = 0xf,
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};
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char buf[256];
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char *buf;
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char *hostname_str;
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if (argc < 1)
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bb_show_usage();
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getopt32(argv, "dfisF:", &hostname_str);
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argv += optind;
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buf = safe_gethostname();
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/* Output in desired format */
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if (option_mask32 & OPT_dfis) {
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struct hostent *hp;
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char *p;
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gethostname(buf, sizeof(buf));
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hp = xgethostbyname(buf);
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p = strchr(hp->h_name, '.');
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if (option_mask32 & OPT_f) {
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puts(hp->h_name);
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} else if (option_mask32 & OPT_s) {
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if (p != NULL) {
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if (p)
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*p = '\0';
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}
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puts(hp->h_name);
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} else if (option_mask32 & OPT_d) {
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if (p)
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@ -89,14 +88,15 @@ int hostname_main(int argc, char **argv)
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/* Set the hostname */
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else if (option_mask32 & OPT_F) {
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do_sethostname(hostname_str, 1);
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} else if (optind < argc) {
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do_sethostname(argv[optind], 0);
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} else if (argv[0]) {
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do_sethostname(argv[0], 0);
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}
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/* Or if all else fails,
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* just print the current hostname */
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else {
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gethostname(buf, sizeof(buf));
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puts(buf);
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}
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if (ENABLE_FEATURE_CLEAN_UP)
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free(buf);
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return 0;
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}
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@ -97,8 +97,8 @@ struct globals {
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struct shbuf_ds *shbuf;
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#endif
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time_t last_log_time;
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/* localhost's name */
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char localHostName[64];
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/* localhost's name. We print only first 64 chars */
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char *hostname;
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/* We recv into recvbuf... */
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char recvbuf[MAX_READ];
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@ -416,7 +416,7 @@ static void timestamp_and_log(int pri, char *msg, int len)
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else {
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char res[20];
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parse_fac_prio_20(pri, res);
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sprintf(G.printbuf, "%s %s %s %s\n", timestamp, G.localHostName, res, msg);
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sprintf(G.printbuf, "%s %.64s %s %s\n", timestamp, G.hostname, res, msg);
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}
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/* Log message locally (to file or shared mem) */
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@ -647,11 +647,8 @@ int syslogd_main(int argc, char **argv)
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option_mask32 |= OPT_locallog;
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/* Store away localhost's name before the fork */
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/* "It is unspecified whether the truncated hostname
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* will be null-terminated". We give it (size - 1),
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* thus last byte will be NUL no matter what. */
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gethostname(G.localHostName, sizeof(G.localHostName) - 1);
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*strchrnul(G.localHostName, '.') = '\0';
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G.hostname = safe_gethostname();
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*strchrnul(G.hostname, '.') = '\0';
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if (!(option_mask32 & OPT_nofork)) {
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bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
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