# 2.11BSD#431 - /usr/src/libexec/tcpd/percent_x.c

##### Functions

    percent_x         X

       1:  /*
       2:   * percent_x() takes a string and performs %<char> expansions. It aborts the
       3:   * program when the expansion would overflow the output buffer. The result
       4:   * of %<char> expansion may be passed on to a shell process. For this
       5:   * reason, characters with a special meaning to shells are replaced by
       6:   * underscores.
       7:   *
       8:   * Diagnostics are reported through syslog(3).
       9:   *
      10:   * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
      11:   */
      12:
      13: #ifndef lint
      14: static char sccsid[] = "@(#) percent_x.c 1.4 94/12/28 17:42:37";
      15: #endif
      16:
      17: /* System libraries. */
      18:
      19: #include <stdio.h>
      20: #include <syslog.h>
      21: #include <string.h>
      22:
      23: extern void exit();
      24:
      25: /* Local stuff. */
      26:
      27: #include "tcpd.h"
      28:
      29: /* percent_x - do %<char> expansion, abort if result buffer is too small */
      30:
      31: char   *percent_x(result, result_len, string, request)
      32: char   *result;
      33: int     result_len;
      34: char   *string;
      35: struct request_info *request;
      36: {
      37:     char   *bp = result;
      38:     char   *end = result + result_len - 1;  /* end of result buffer */
      39:     char   *expansion;
      40:     int     expansion_len;
      41:     static char ok_chars[] = "1234567890!@%-_=+:,./\
      42: abcdefghijklmnopqrstuvwxyz\
      43: ABCDEFGHIJKLMNOPQRSTUVWXYZ";
      44:     char   *str = string;
      45:     char   *cp;
      46:     int     ch;
      47:
      48:     /*
      49:      * Warning: we may be called from a child process or after pattern
      50:      * matching, so we cannot use clean_exit() or tcpd_jump().
      51:      */
      52:
      53:     while (*str) {
      54:     if (*str == '%' && (ch = str[1]) != 0) {
      55:         str += 2;
      56:         expansion =
      57:         ch == 'a' ? eval_hostaddr(request->client) :
      58:         ch == 'A' ? eval_hostaddr(request->server) :
      59:         ch == 'c' ? eval_client(request) :
      60:         ch == 'd' ? eval_daemon(request) :
      61:         ch == 'h' ? eval_hostinfo(request->client) :
      62:         ch == 'H' ? eval_hostinfo(request->server) :
      63:         ch == 'n' ? eval_hostname(request->client) :
      64:         ch == 'N' ? eval_hostname(request->server) :
      65:         ch == 'p' ? eval_pid(request) :
      66:         ch == 's' ? eval_server(request) :
      67:         ch == 'u' ? eval_user(request) :
      68:         ch == '%' ? "%" : (tcpd_warn("unrecognized %%%c", ch), "");
      69:         for (cp = expansion; *(cp += strspn(cp, ok_chars)); /* */ )
      70:         *cp = '_';
      71:         expansion_len = cp - expansion;
      72:     } else {
      73:         expansion = str++;
      74:         expansion_len = 1;
      75:     }
      76:     if (bp + expansion_len >= end) {
      77:         tcpd_warn("percent_x: expansion too long: %.30s...", result);
      78:         sleep(5);
      79:         exit(0);
      80:     }
      81:     memcpy(bp, expansion, expansion_len);
      82:     bp += expansion_len;
      83:     }
      84:     *bp = 0;
      85:     return (result);
      86: }

#### Defined functions

percent_x defined in line 31; used 7 times

- in /usr/src/libexec/tcpd/hosts_access.c line 166
- in /usr/src/libexec/tcpd/options.c line 185, 234
- in /usr/src/libexec/tcpd/tcpd.h line 71
- in /usr/src/libexec/tcpd/tcpdchk.c line 240
- in /usr/src/libexec/tcpd/tcpdmatch.c line 264
- in /usr/src/libexec/tcpd/try-from.c line 73

#### Defined variables

sccsid defined in line 14; never used

Last modified: 1994-12-28 Generated: 2016-12-26 | Generated by src2html V0.67 page hit count: 557 |