hydra/src/util.c

/*
 *  Boa, an http server
 *  Copyright (C) 1995 Paul Phillips <paulp@go2net.com>
 *  Some changes Copyright (C) 1996,97 Larry Doolittle <ldoolitt@boa.org>
 *  Some changes Copyright (C) 1996 Charles F. Randall <crandall@goldsys.com>
 *  Some changes Copyright (C) 1996-99 Jon Nelson <jnelson@boa.org>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 1, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

/* $Id: util.c,v 1.1.1.1 2002/09/21 13:53:50 nmav Exp $ */

#include "boa.h"

#define HEX_TO_DECIMAL(char1, char2)    \
    (((char1 >= 'A') ? (((char1 & 0xdf) - 'A') + 10) : (char1 - '0')) * 16) + \
    (((char2 >= 'A') ? (((char2 & 0xdf) - 'A') + 10) : (char2 - '0')))

const char month_tab[48] =
    "Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ";
const char day_tab[] = "Sun,Mon,Tue,Wed,Thu,Fri,Sat,";

/*
 * Name: clean_pathname
 *
 * Description: Replaces unsafe/incorrect instances of:
 *  //[...] with /
 *  /./ with /
 *  /../ with / (technically not what we want, but browsers should deal
 *   with this, not servers)
 */

void clean_pathname(char *pathname)
{
    char *cleanpath, c;

    cleanpath = pathname;
    while ((c = *pathname++)) {
        if (c == '/') {
            while (1) {
                if (*pathname == '/')
                    pathname++;
                else if (*pathname == '.' && *(pathname + 1) == '/')
                    pathname += 2;
                else if (*pathname == '.' && *(pathname + 1) == '.' &&
                         *(pathname + 2) == '/') {
                    pathname += 3;
                } else
                    break;
            }
            c = '/';
        }
        *cleanpath++ = c;
    }

    *cleanpath = '\0';
}

/*
 * Name: get_commonlog_time
 *
 * Description: Returns the current time in common log format in a static
 * char buffer.
 *
 * commonlog time is exactly 25 characters long
 * because this is only used in logging, we add " [" before and "] " after
 * making 29 characters
 * "[27/Feb/1998:20:20:04 +0000] "
 *
 * Constrast with rfc822 time:
 * "Sun, 06 Nov 1994 08:49:37 GMT"
 *
 * Altered 10 Jan 2000 by Jon Nelson ala Drew Streib for non UTC logging
 *
 */

void get_commonlog_time(char buf[30])
{
    struct tm *t;
    char *p;
    unsigned int a;
    int time_offset;

    if (use_localtime) {
        t = localtime(&current_time);
        time_offset = TIMEZONE_OFFSET(t);
    } else {
        t = gmtime(&current_time);
        time_offset = 0;
    }

    p = buf + 29;
    *p-- = '\0';
    *p-- = ' ';
    *p-- = ']';
    a = abs(time_offset / 60);
    *p-- = '0' + a % 10;
    a /= 10;
    *p-- = '0' + a % 6;
    a /= 6;
    *p-- = '0' + a % 10;
    *p-- = '0' + a / 10;
    *p-- = (time_offset >= 0) ? '+' : '-';
    *p-- = ' ';

    a = t->tm_sec;
    *p-- = '0' + a % 10;
    *p-- = '0' + a / 10;
    *p-- = ':';
    a = t->tm_min;
    *p-- = '0' + a % 10;
    *p-- = '0' + a / 10;
    *p-- = ':';
    a = t->tm_hour;
    *p-- = '0' + a % 10;
    *p-- = '0' + a / 10;
    *p-- = ':';
    a = 1900 + t->tm_year;
    while (a) {
        *p-- = '0' + a % 10;
        a /= 10;
    }
    /* p points to an unused spot */
    *p-- = '/';
    p -= 2;
    memcpy(p--, month_tab + 4 * (t->tm_mon), 3);
    *p-- = '/';
    a = t->tm_mday;
    *p-- = '0' + a % 10;
    *p-- = '0' + a / 10;
    *p = '[';
    return;                   /* should be same as returning buf */
}

/*
 * Name: month2int
 *
 * Description: Turns a three letter month into a 0-11 int
 *
 * Note: This function is from wn-v1.07 -- it's clever and fast
 */

int month2int(char *monthname)
{
    switch (*monthname) {
    case 'A':
        return (*++monthname == 'p' ? 3 : 7);
    case 'D':
        return (11);
    case 'F':
        return (1);
    case 'J':
        if (*++monthname == 'a')
            return (0);
        return (*++monthname == 'n' ? 5 : 6);
    case 'M':
        return (*(monthname + 2) == 'r' ? 2 : 4);
    case 'N':
        return (10);
    case 'O':
        return (9);
    case 'S':
        return (8);
    default:
        return (-1);
    }
}

/*
 * Name: modified_since
 * Description: Decides whether a file's mtime is newer than the
 * If-Modified-Since header of a request.
 *

 Sun, 06 Nov 1994 08:49:37 GMT    ; RFC 822, updated by RFC 1123
 Sunday, 06-Nov-94 08:49:37 GMT   ; RFC 850, obsoleted by RFC 1036
 Sun Nov  6 08:49:37 1994         ; ANSI C's asctime() format
 31 September 2000 23:59:59 GMT   ; non-standard

 * RETURN VALUES:
 *  0: File has not been modified since specified time.
 *  1: File has been.
 * -1: Error!
 */

int modified_since(time_t * mtime, char *if_modified_since)
{
    struct tm *file_gmt;
    char *ims_info;
    char monthname[10 + 1];
    int day, month, year, hour, minute, second;
    int comp;

    ims_info = if_modified_since;
    while (*ims_info != ' ' && *ims_info != '\0')
        ++ims_info;
    if (*ims_info != ' ')
        return -1;

    /* the pre-space in the third scanf skips whitespace for the string */
    if (sscanf(ims_info, "%d %3s %d %d:%d:%d GMT", /* RFC 1123 */
               &day, monthname, &year, &hour, &minute, &second) == 6);
    else if (sscanf(ims_info, "%d-%3s-%d %d:%d:%d GMT", /* RFC 1036 */
                    &day, monthname, &year, &hour, &minute, &second) == 6)
        year += 1900;
    else if (sscanf(ims_info, " %3s %d %d:%d:%d %d", /* asctime() format */
                    monthname, &day, &hour, &minute, &second, &year) == 6);
    /*  allow this non-standard date format: 31 September 2000 23:59:59 GMT */
    /* NOTE: Use if_modified_since here, because the date *starts*
     *       with the day, versus a throwaway item
     */
    else if (sscanf(if_modified_since, "%d %10s %d %d:%d:%d GMT",
                    &day, monthname, &year, &hour, &minute, &second) == 6);
    else {
        log_error_time();
        fprintf(stderr, "Error in %s, line %d: Unable to sscanf \"%s\"\n",
                __FILE__, __LINE__, ims_info);
        return -1;              /* error */
    }

    file_gmt = gmtime(mtime);
    month = month2int(monthname);

    /* Go through from years to seconds -- if they are ever unequal,
     we know which one is newer and can return */

    if ((comp = 1900 + file_gmt->tm_year - year))
        return (comp > 0);
    if ((comp = file_gmt->tm_mon - month))
        return (comp > 0);
    if ((comp = file_gmt->tm_mday - day))
        return (comp > 0);
    if ((comp = file_gmt->tm_hour - hour))
        return (comp > 0);
    if ((comp = file_gmt->tm_min - minute))
        return (comp > 0);
    if ((comp = file_gmt->tm_sec - second))
        return (comp > 0);

    return 0;                   /* this person must really be into the latest/greatest */
}


/*
 * Name: to_upper
 *
 * Description: Turns a string into all upper case (for HTTP_ header forming)
 * AND changes - into _
 */

char *to_upper(char *str)
{
    char *start = str;

    while (*str) {
        if (*str == '-')
            *str = '_';
        else
            *str = toupper(*str);

        str++;
    }

    return start;
}

/*
 * Name: unescape_uri
 *
 * Description: Decodes a uri, changing %xx encodings with the actual
 * character.  The query_string should already be gone.
 *
 * Return values:
 *  1: success
 *  0: illegal string
 */

int unescape_uri(char *uri, char ** query_string)
{
    char c, d;
    char *uri_old;

    uri_old = uri;

    while ((c = *uri_old)) {
        if (c == '%') {
            uri_old++;
            if ((c = *uri_old++) && (d = *uri_old++))
                *uri++ = HEX_TO_DECIMAL(c, d);
            else
                return 0;       /* NULL in chars to be decoded */
        } else if (c == '?') { /* query string */
            if (query_string)
                *query_string = ++uri_old;
            /* stop here */
            *uri = '\0';
            return(1);
            break;
        } else if (c == '#') { /* fragment */
            /* legal part of URL, but we do *not* care.
             * However, we still have to look for the query string */
            if (query_string) {
                ++uri_old;
                while((c = *uri_old)) {
                    if (c == '?') {
                        *query_string = ++uri_old;
                        break;
                    }
                    ++uri_old;
                }
            }
            break;
        } else {
            *uri++ = c;
            uri_old++;
        }
    }

    *uri = '\0';
    return 1;
}

/* rfc822 (1123) time is exactly 29 characters long
 * "Sun, 06 Nov 1994 08:49:37 GMT"
 */

void rfc822_time_buf(char *buf, time_t s)
{
    struct tm *t;
    char *p;
    unsigned int a;

    if (!s) {
        t = gmtime(&current_time);
    } else
        t = gmtime(&s);

    p = buf + 28;
    /* p points to the last char in the buf */

    p -= 3;
    /* p points to where the ' ' will go */
    memcpy(p--, " GMT", 4);

    a = t->tm_sec;
    *p-- = '0' + a % 10;
    *p-- = '0' + a / 10;
    *p-- = ':';
    a = t->tm_min;
    *p-- = '0' + a % 10;
    *p-- = '0' + a / 10;
    *p-- = ':';
    a = t->tm_hour;
    *p-- = '0' + a % 10;
    *p-- = '0' + a / 10;
    *p-- = ' ';
    a = 1900 + t->tm_year;
    while (a) {
        *p-- = '0' + a % 10;
        a /= 10;
    }
    /* p points to an unused spot to where the space will go */
    p -= 3;
    /* p points to where the first char of the month will go */
    memcpy(p--, month_tab + 4 * (t->tm_mon), 4);
    *p-- = ' ';
    a = t->tm_mday;
    *p-- = '0' + a % 10;
    *p-- = '0' + a / 10;
    *p-- = ' ';
    p -= 3;
    memcpy(p, day_tab + t->tm_wday * 4, 4);
}

void simple_itoa(unsigned int i, char buf[22])
{
    /* 21 digits plus null terminator, good for 64-bit or smaller ints
     * for bigger ints, use a bigger buffer!
     *
     * 4294967295 is, incidentally, MAX_UINT (on 32bit systems at this time)
     * and is 10 bytes long
     */
    /* FIXME */
    char *p = &buf[21];
    *p-- = '\0';
    do {
        *p-- = '0' + i % 10;
        i /= 10;
    } while (i > 0);

    return;
}

/* I don't "do" negative conversions
 * Therefore, -1 indicates error
 */

int boa_atoi(char *s)
{
    int retval;
    char reconv[22];

    if (!isdigit(*s))
        return -1;

    retval = atoi(s);
    if (retval < 0)
        return -1;

    simple_itoa(retval, reconv);
    if (memcmp(s,reconv,strlen(s)) != 0) {
        return -1;
    }
    return retval;
}

int create_temporary_file(short want_unlink, char *storage, int size)
{
    char boa_tempfile[MAX_PATH_LENGTH + 1];
    int fd;

    snprintf(boa_tempfile, MAX_PATH_LENGTH,
             "%s/boa-temp.XXXXXX", tempdir);

    /* open temp file */
    fd = mkstemp(boa_tempfile);
    if (fd == -1) {
        log_error_time();
        perror("mkstemp");
        return 0;
    }

    if (storage != NULL) {
        int len = strlen(boa_tempfile);

        if (len < size) {
            memcpy(storage, boa_tempfile, len + 1);
        } else {
            close(fd);
            fd = 0;
            log_error_time();
            fprintf(stderr, "not enough memory for memcpy in storage\n");
            want_unlink = 1;
        }
    }

    if (want_unlink) {
        if (unlink(boa_tempfile) == -1) {
            close(fd);
            fd = 0;
            log_error_time();
            fprintf(stderr, "unlink temp file\n");
        }
    }

    return (fd);
}

/*
 * Name: normalize_path
 *
 * Description: Makes sure relative paths are made absolute
 *
 */

#define DIRBUF_SIZE MAX_PATH_LENGTH * 2 + 1
char * normalize_path(char *path)
{
    char dirbuf[DIRBUF_SIZE];
    int len1, len2;
    char *endpath;

    if (path[0] == '/') {
        endpath = strdup(path);
    } else {

#ifndef HAVE_GETCWD
        perror("boa: getcwd() not defined. Aborting.");
        exit(1);
#endif
        if (getcwd(dirbuf, DIRBUF_SIZE) == NULL) {
            if (errno == ERANGE)
                perror
                    ("boa: getcwd() failed - unable to get working directory. "
                     "Aborting.");
            else if (errno == EACCES)
                perror("boa: getcwd() failed - No read access in current "
                       "directory. Aborting.");
            else
                perror("boa: getcwd() failed - unknown error. Aborting.");
            exit(1);
        }

        /* OK, now the hard part. */
        len1 = strlen(dirbuf);
        len2 = strlen(path);
        if (len1 + len2 > MAX_PATH_LENGTH * 2) {
            perror("boa: eek. unable to normalize pathname");
            exit(1);
        }
        if (strcmp(path,".") != 0) {
            memcpy(dirbuf + len1, "/", 1);
            memcpy(dirbuf + len1 + 1, path, len2 + 1);
        }
        /* fprintf(stderr, "boa: normalize gets \"%s\"\n", dirbuf); */

        endpath = strdup(dirbuf);
    }

    if (endpath == NULL) {
        fprintf(stderr,
                "boa: Cannot strdup path. Aborting.\n");
        exit(1);
    }
    return endpath;
}

int real_set_block_fd(int fd)
{
    int flags;

    flags = fcntl(fd, F_GETFL);
    if (flags == -1)
        return -1;

    flags &= ~O_NONBLOCK;
    flags = fcntl(fd, F_SETFL, flags);
    return flags;
}

int real_set_nonblock_fd(int fd)
{
    int flags;

    flags = fcntl(fd, F_GETFL);
    if (flags == -1)
        return -1;

    flags |= O_NONBLOCK;
    flags = fcntl(fd, F_SETFL, flags);
    return flags;
}
1	nmav	1.1	/*
2			* Boa, an http server
3			* Copyright (C) 1995 Paul Phillips <paulp@go2net.com>
4			* Some changes Copyright (C) 1996,97 Larry Doolittle <ldoolitt@boa.org>
5			* Some changes Copyright (C) 1996 Charles F. Randall <crandall@goldsys.com>
6			* Some changes Copyright (C) 1996-99 Jon Nelson <jnelson@boa.org>
7			*
8			* This program is free software; you can redistribute it and/or modify
9			* it under the terms of the GNU General Public License as published by
10			* the Free Software Foundation; either version 1, or (at your option)
11			* any later version.
12			*
13			* This program is distributed in the hope that it will be useful,
14			* but WITHOUT ANY WARRANTY; without even the implied warranty of
15			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16			* GNU General Public License for more details.
17			*
18			* You should have received a copy of the GNU General Public License
19			* along with this program; if not, write to the Free Software
20			* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21			*
22			*/
23
24	nmav	1.2	/* $Id: util.c,v 1.1.1.1 2002/09/21 13:53:50 nmav Exp $ */
25	nmav	1.1
26			#include "boa.h"
27
28			#define HEX_TO_DECIMAL(char1, char2) \
29			(((char1 >= 'A') ? (((char1 & 0xdf) - 'A') + 10) : (char1 - '0')) * 16) + \
30			(((char2 >= 'A') ? (((char2 & 0xdf) - 'A') + 10) : (char2 - '0')))
31
32			const char month_tab[48] =
33			"Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ";
34			const char day_tab[] = "Sun,Mon,Tue,Wed,Thu,Fri,Sat,";
35
36			/*
37			* Name: clean_pathname
38			*
39			* Description: Replaces unsafe/incorrect instances of:
40			* //[...] with /
41			* /./ with /
42			* /../ with / (technically not what we want, but browsers should deal
43			* with this, not servers)
44			*/
45
46			void clean_pathname(char *pathname)
47			{
48			char *cleanpath, c;
49
50			cleanpath = pathname;
51			while ((c = *pathname++)) {
52			if (c == '/') {
53			while (1) {
54			if (*pathname == '/')
55			pathname++;
56			else if (pathname == '.' && (pathname + 1) == '/')
57			pathname += 2;
58			else if (pathname == '.' && (pathname + 1) == '.' &&
59			*(pathname + 2) == '/') {
60			pathname += 3;
61			} else
62			break;
63			}
64			c = '/';
65			}
66			*cleanpath++ = c;
67			}
68
69			*cleanpath = '\0';
70			}
71
72			/*
73			* Name: get_commonlog_time
74			*
75			* Description: Returns the current time in common log format in a static
76			* char buffer.
77			*
78			* commonlog time is exactly 25 characters long
79			* because this is only used in logging, we add " [" before and "] " after
80			* making 29 characters
81			* "[27/Feb/1998:20:20:04 +0000] "
82			*
83			* Constrast with rfc822 time:
84			* "Sun, 06 Nov 1994 08:49:37 GMT"
85			*
86			* Altered 10 Jan 2000 by Jon Nelson ala Drew Streib for non UTC logging
87			*
88			*/
89
90	nmav	1.2	void get_commonlog_time(char buf[30])
91	nmav	1.1	{
92			struct tm *t;
93			char *p;
94			unsigned int a;
95			int time_offset;
96
97			if (use_localtime) {
98			t = localtime(&current_time);
99			time_offset = TIMEZONE_OFFSET(t);
100			} else {
101			t = gmtime(&current_time);
102			time_offset = 0;
103			}
104
105			p = buf + 29;
106			*p-- = '\0';
107			*p-- = ' ';
108			*p-- = ']';
109			a = abs(time_offset / 60);
110			*p-- = '0' + a % 10;
111			a /= 10;
112			*p-- = '0' + a % 6;
113			a /= 6;
114			*p-- = '0' + a % 10;
115			*p-- = '0' + a / 10;
116			*p-- = (time_offset >= 0) ? '+' : '-';
117			*p-- = ' ';
118
119			a = t->tm_sec;
120			*p-- = '0' + a % 10;
121			*p-- = '0' + a / 10;
122			*p-- = ':';
123			a = t->tm_min;
124			*p-- = '0' + a % 10;
125			*p-- = '0' + a / 10;
126			*p-- = ':';
127			a = t->tm_hour;
128			*p-- = '0' + a % 10;
129			*p-- = '0' + a / 10;
130			*p-- = ':';
131			a = 1900 + t->tm_year;
132			while (a) {
133			*p-- = '0' + a % 10;
134			a /= 10;
135			}
136			/* p points to an unused spot */
137			*p-- = '/';
138			p -= 2;
139			memcpy(p--, month_tab + 4 * (t->tm_mon), 3);
140			*p-- = '/';
141			a = t->tm_mday;
142			*p-- = '0' + a % 10;
143			*p-- = '0' + a / 10;
144			*p = '[';
145	nmav	1.2	return; /* should be same as returning buf */
146	nmav	1.1	}
147
148			/*
149			* Name: month2int
150			*
151			* Description: Turns a three letter month into a 0-11 int
152			*
153			* Note: This function is from wn-v1.07 -- it's clever and fast
154			*/
155
156			int month2int(char *monthname)
157			{
158			switch (*monthname) {
159			case 'A':
160			return (*++monthname == 'p' ? 3 : 7);
161			case 'D':
162			return (11);
163			case 'F':
164			return (1);
165			case 'J':
166			if (*++monthname == 'a')
167			return (0);
168			return (*++monthname == 'n' ? 5 : 6);
169			case 'M':
170			return (*(monthname + 2) == 'r' ? 2 : 4);
171			case 'N':
172			return (10);
173			case 'O':
174			return (9);
175			case 'S':
176			return (8);
177			default:
178			return (-1);
179			}
180			}
181
182			/*
183			* Name: modified_since
184			* Description: Decides whether a file's mtime is newer than the
185			* If-Modified-Since header of a request.
186			*
187
188			Sun, 06 Nov 1994 08:49:37 GMT ; RFC 822, updated by RFC 1123
189			Sunday, 06-Nov-94 08:49:37 GMT ; RFC 850, obsoleted by RFC 1036
190			Sun Nov 6 08:49:37 1994 ; ANSI C's asctime() format
191			31 September 2000 23:59:59 GMT ; non-standard
192
193			* RETURN VALUES:
194			* 0: File has not been modified since specified time.
195			* 1: File has been.
196			* -1: Error!
197			*/
198
199			int modified_since(time_t * mtime, char *if_modified_since)
200			{
201			struct tm *file_gmt;
202			char *ims_info;
203			char monthname[10 + 1];
204			int day, month, year, hour, minute, second;
205			int comp;
206
207			ims_info = if_modified_since;
208			while (ims_info != ' ' && ims_info != '\0')
209			++ims_info;
210			if (*ims_info != ' ')
211			return -1;
212
213			/* the pre-space in the third scanf skips whitespace for the string */
214			if (sscanf(ims_info, "%d %3s %d %d:%d:%d GMT", /* RFC 1123 */
215			&day, monthname, &year, &hour, &minute, &second) == 6);
216			else if (sscanf(ims_info, "%d-%3s-%d %d:%d:%d GMT", /* RFC 1036 */
217			&day, monthname, &year, &hour, &minute, &second) == 6)
218			year += 1900;
219			else if (sscanf(ims_info, " %3s %d %d:%d:%d %d", /* asctime() format */
220			monthname, &day, &hour, &minute, &second, &year) == 6);
221			/* allow this non-standard date format: 31 September 2000 23:59:59 GMT */
222			/* NOTE: Use if_modified_since here, because the date starts
223			* with the day, versus a throwaway item
224			*/
225			else if (sscanf(if_modified_since, "%d %10s %d %d:%d:%d GMT",
226			&day, monthname, &year, &hour, &minute, &second) == 6);
227			else {
228			log_error_time();
229			fprintf(stderr, "Error in %s, line %d: Unable to sscanf \"%s\"\n",
230			__FILE__, __LINE__, ims_info);
231			return -1; /* error */
232			}
233
234			file_gmt = gmtime(mtime);
235			month = month2int(monthname);
236
237			/* Go through from years to seconds -- if they are ever unequal,
238			we know which one is newer and can return */
239
240			if ((comp = 1900 + file_gmt->tm_year - year))
241			return (comp > 0);
242			if ((comp = file_gmt->tm_mon - month))
243			return (comp > 0);
244			if ((comp = file_gmt->tm_mday - day))
245			return (comp > 0);
246			if ((comp = file_gmt->tm_hour - hour))
247			return (comp > 0);
248			if ((comp = file_gmt->tm_min - minute))
249			return (comp > 0);
250			if ((comp = file_gmt->tm_sec - second))
251			return (comp > 0);
252
253			return 0; /* this person must really be into the latest/greatest */
254			}
255
256
257			/*
258			* Name: to_upper
259			*
260			* Description: Turns a string into all upper case (for HTTP_ header forming)
261			* AND changes - into _
262			*/
263
264			char to_upper(char str)
265			{
266			char *start = str;
267
268			while (*str) {
269			if (*str == '-')
270			*str = '_';
271			else
272			str = toupper(str);
273
274			str++;
275			}
276
277			return start;
278			}
279
280			/*
281			* Name: unescape_uri
282			*
283			* Description: Decodes a uri, changing %xx encodings with the actual
284			* character. The query_string should already be gone.
285			*
286			* Return values:
287			* 1: success
288			* 0: illegal string
289			*/
290
291			int unescape_uri(char uri, char * query_string)
292			{
293			char c, d;
294			char *uri_old;
295
296			uri_old = uri;
297
298			while ((c = *uri_old)) {
299			if (c == '%') {
300			uri_old++;
301			if ((c = uri_old++) && (d = uri_old++))
302			*uri++ = HEX_TO_DECIMAL(c, d);
303			else
304			return 0; /* NULL in chars to be decoded */
305			} else if (c == '?') { /* query string */
306			if (query_string)
307			*query_string = ++uri_old;
308			/* stop here */
309			*uri = '\0';
310			return(1);
311			break;
312			} else if (c == '#') { /* fragment */
313			/* legal part of URL, but we do not care.
314			* However, we still have to look for the query string */
315			if (query_string) {
316			++uri_old;
317			while((c = *uri_old)) {
318			if (c == '?') {
319			*query_string = ++uri_old;
320			break;
321			}
322			++uri_old;
323			}
324			}
325			break;
326			} else {
327			*uri++ = c;
328			uri_old++;
329			}
330			}
331
332			*uri = '\0';
333			return 1;
334			}
335
336			/* rfc822 (1123) time is exactly 29 characters long
337			* "Sun, 06 Nov 1994 08:49:37 GMT"
338			*/
339
340			void rfc822_time_buf(char *buf, time_t s)
341			{
342			struct tm *t;
343			char *p;
344			unsigned int a;
345
346			if (!s) {
347			t = gmtime(&current_time);
348			} else
349			t = gmtime(&s);
350
351			p = buf + 28;
352			/* p points to the last char in the buf */
353
354			p -= 3;
355			/* p points to where the ' ' will go */
356			memcpy(p--, " GMT", 4);
357
358			a = t->tm_sec;
359			*p-- = '0' + a % 10;
360			*p-- = '0' + a / 10;
361			*p-- = ':';
362			a = t->tm_min;
363			*p-- = '0' + a % 10;
364			*p-- = '0' + a / 10;
365			*p-- = ':';
366			a = t->tm_hour;
367			*p-- = '0' + a % 10;
368			*p-- = '0' + a / 10;
369			*p-- = ' ';
370			a = 1900 + t->tm_year;
371			while (a) {
372			*p-- = '0' + a % 10;
373			a /= 10;
374			}
375			/* p points to an unused spot to where the space will go */
376			p -= 3;
377			/* p points to where the first char of the month will go */
378			memcpy(p--, month_tab + 4 * (t->tm_mon), 4);
379			*p-- = ' ';
380			a = t->tm_mday;
381			*p-- = '0' + a % 10;
382			*p-- = '0' + a / 10;
383			*p-- = ' ';
384			p -= 3;
385			memcpy(p, day_tab + t->tm_wday * 4, 4);
386			}
387
388	nmav	1.2	void simple_itoa(unsigned int i, char buf[22])
389	nmav	1.1	{
390			/* 21 digits plus null terminator, good for 64-bit or smaller ints
391			* for bigger ints, use a bigger buffer!
392			*
393			* 4294967295 is, incidentally, MAX_UINT (on 32bit systems at this time)
394			* and is 10 bytes long
395			*/
396	nmav	1.2	/* FIXME */
397			char *p = &buf[21];
398	nmav	1.1	*p-- = '\0';
399			do {
400			*p-- = '0' + i % 10;
401			i /= 10;
402			} while (i > 0);
403	nmav	1.2
404			return;
405	nmav	1.1	}
406
407			/* I don't "do" negative conversions
408			* Therefore, -1 indicates error
409			*/
410
411			int boa_atoi(char *s)
412			{
413			int retval;
414	nmav	1.2	char reconv[22];
415	nmav	1.1
416			if (!isdigit(*s))
417			return -1;
418
419			retval = atoi(s);
420			if (retval < 0)
421			return -1;
422
423	nmav	1.2	simple_itoa(retval, reconv);
424	nmav	1.1	if (memcmp(s,reconv,strlen(s)) != 0) {
425			return -1;
426			}
427			return retval;
428			}
429
430			int create_temporary_file(short want_unlink, char *storage, int size)
431			{
432	nmav	1.2	char boa_tempfile[MAX_PATH_LENGTH + 1];
433	nmav	1.1	int fd;
434
435			snprintf(boa_tempfile, MAX_PATH_LENGTH,
436			"%s/boa-temp.XXXXXX", tempdir);
437
438			/* open temp file */
439			fd = mkstemp(boa_tempfile);
440			if (fd == -1) {
441			log_error_time();
442			perror("mkstemp");
443			return 0;
444			}
445
446			if (storage != NULL) {
447			int len = strlen(boa_tempfile);
448
449			if (len < size) {
450			memcpy(storage, boa_tempfile, len + 1);
451			} else {
452			close(fd);
453			fd = 0;
454			log_error_time();
455			fprintf(stderr, "not enough memory for memcpy in storage\n");
456			want_unlink = 1;
457			}
458			}
459
460			if (want_unlink) {
461			if (unlink(boa_tempfile) == -1) {
462			close(fd);
463			fd = 0;
464			log_error_time();
465			fprintf(stderr, "unlink temp file\n");
466			}
467			}
468
469			return (fd);
470			}
471
472			/*
473			* Name: normalize_path
474			*
475			* Description: Makes sure relative paths are made absolute
476			*
477			*/
478
479			#define DIRBUF_SIZE MAX_PATH_LENGTH * 2 + 1
480			char * normalize_path(char *path)
481			{
482			char dirbuf[DIRBUF_SIZE];
483			int len1, len2;
484			char *endpath;
485
486			if (path[0] == '/') {
487			endpath = strdup(path);
488			} else {
489
490			#ifndef HAVE_GETCWD
491			perror("boa: getcwd() not defined. Aborting.");
492			exit(1);
493			#endif
494			if (getcwd(dirbuf, DIRBUF_SIZE) == NULL) {
495			if (errno == ERANGE)
496			perror
497			("boa: getcwd() failed - unable to get working directory. "
498			"Aborting.");
499			else if (errno == EACCES)
500			perror("boa: getcwd() failed - No read access in current "
501			"directory. Aborting.");
502			else
503			perror("boa: getcwd() failed - unknown error. Aborting.");
504			exit(1);
505			}
506
507			/* OK, now the hard part. */
508			len1 = strlen(dirbuf);
509			len2 = strlen(path);
510			if (len1 + len2 > MAX_PATH_LENGTH * 2) {
511			perror("boa: eek. unable to normalize pathname");
512			exit(1);
513			}
514			if (strcmp(path,".") != 0) {
515			memcpy(dirbuf + len1, "/", 1);
516			memcpy(dirbuf + len1 + 1, path, len2 + 1);
517			}
518			/* fprintf(stderr, "boa: normalize gets \"%s\"\n", dirbuf); */
519
520			endpath = strdup(dirbuf);
521			}
522
523			if (endpath == NULL) {
524			fprintf(stderr,
525			"boa: Cannot strdup path. Aborting.\n");
526			exit(1);
527			}
528			return endpath;
529			}
530
531			int real_set_block_fd(int fd)
532			{
533			int flags;
534
535			flags = fcntl(fd, F_GETFL);
536			if (flags == -1)
537			return -1;
538
539			flags &= ~O_NONBLOCK;
540			flags = fcntl(fd, F_SETFL, flags);
541			return flags;
542			}
543
544			int real_set_nonblock_fd(int fd)
545			{
546			int flags;
547
548			flags = fcntl(fd, F_GETFL);
549			if (flags == -1)
550			return -1;
551
552			flags \|= O_NONBLOCK;
553			flags = fcntl(fd, F_SETFL, flags);
554			return flags;
555			}