diff options
Diffstat (limited to 'contrib/openpam/lib/openpam_readline.c')
-rw-r--r-- | contrib/openpam/lib/openpam_readline.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/contrib/openpam/lib/openpam_readline.c b/contrib/openpam/lib/openpam_readline.c new file mode 100644 index 0000000..9cc8cc1 --- /dev/null +++ b/contrib/openpam/lib/openpam_readline.c @@ -0,0 +1,156 @@ +/*- + * Copyright (c) 2003 Networks Associates Technology, Inc. + * Copyright (c) 2004-2011 Dag-Erling Smørgrav + * All rights reserved. + * + * This software was developed for the FreeBSD Project by ThinkSec AS and + * Network Associates Laboratories, the Security Research Division of + * Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 + * ("CBOSS"), as part of the DARPA CHATS research program. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior written + * permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $Id: openpam_readline.c 473 2011-11-03 10:48:25Z des $ + */ + +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif + +#include <ctype.h> +#include <stdio.h> +#include <stdlib.h> + +#include <security/pam_appl.h> +#include "openpam_impl.h" + +#define MIN_LINE_LENGTH 128 + +/* + * OpenPAM extension + * + * Read a line from a file. + */ + +char * +openpam_readline(FILE *f, int *lineno, size_t *lenp) +{ + char *line; + size_t len, size; + int ch; + + if ((line = malloc(MIN_LINE_LENGTH)) == NULL) + return (NULL); + size = MIN_LINE_LENGTH; + len = 0; + +#define line_putch(ch) do { \ + if (len >= size - 1) { \ + char *tmp = realloc(line, size *= 2); \ + if (tmp == NULL) \ + goto fail; \ + line = tmp; \ + } \ + line[len++] = ch; \ + line[len] = '\0'; \ +} while (0) + + for (;;) { + ch = fgetc(f); + /* strip comment */ + if (ch == '#') { + do { + ch = fgetc(f); + } while (ch != EOF && ch != '\n'); + } + /* eof */ + if (ch == EOF) { + /* done */ + break; + } + /* eol */ + if (ch == '\n') { + if (lineno != NULL) + ++*lineno; + /* skip blank lines */ + if (len == 0) + continue; + /* continuation */ + if (line[len - 1] == '\\') { + line[--len] = '\0'; + continue; + } + /* done */ + break; + } + /* whitespace */ + if (isspace(ch)) { + /* ignore leading whitespace */ + /* collapse linear whitespace */ + if (len > 0 && line[len - 1] != ' ') + line_putch(' '); + continue; + } + /* anything else */ + line_putch(ch); + } + + /* remove trailing whitespace */ + while (len > 0 && isspace((unsigned char)line[len - 1])) + --len; + line[len] = '\0'; + if (len == 0) + goto fail; + if (lenp != NULL) + *lenp = len; + return (line); +fail: + FREE(line); + return (NULL); +} + +/** + * The =openpam_readline function reads a line from a file, and returns it + * in a NUL-terminated buffer allocated with =malloc. + * + * The =openpam_readline function performs a certain amount of processing + * on the data it reads: + * + * - Comments (introduced by a hash sign) are stripped, as is leading and + * trailing whitespace. + * - Any amount of linear whitespace is collapsed to a single space. + * - Blank lines are ignored. + * - If a line ends in a backslash, the backslash is stripped and the + * next line is appended. + * + * If =lineno is not =NULL, the integer variable it points to is + * incremented every time a newline character is read. + * + * If =lenp is not =NULL, the length of the line (not including the + * terminating NUL character) is stored in the variable it points to. + * + * The caller is responsible for releasing the returned buffer by passing + * it to =free. + */ |