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      1 /*
      2  * Copyright (c) 1983, 1993	The Regents of the University of California.
      3  * Copyright (c) 1993 Digital Equipment Corporation.
      4  * Copyright (c) 2012 G. Vanem <gvanem (at) yahoo.no>.
      5  * Copyright (c) 2017 Ali Abdulkadir <autostart.ini (at) gmail.com>.
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by the University of
     19  *	California, Berkeley and its contributors.
     20  * 4. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  */
     36 
     37 #include <config.h>
     38 
     39 #include <netdissect-stdinc.h>
     40 #include <getservent.h>
     41 
     42 static FILE *servf = NULL;
     43 static char line[BUFSIZ+1];
     44 static struct servent serv;
     45 static char *serv_aliases[MAXALIASES];
     46 int _serv_stayopen;
     47 const char *etc_path(const char *file);
     48 
     49 /*
     50 * Check if <file> exists in the current directory and, if so, return it.
     51 * Else return either "%SYSTEMROOT%\System32\drivers\etc\<file>"
     52 * or $PREFIX/etc/<file>.
     53 * "<file>" is aka __PATH_SERVICES (aka "services" on Windows and
     54 * "/etc/services" on other platforms that would need this).
     55 */
     56 const char *etc_path(const char *file)
     57 {
     58     const char *env = getenv(__PATH_SYSROOT);
     59     static char path[_MAX_PATH];
     60 
     61     /* see if "<file>" exists locally or whether __PATH_SYSROOT is valid */
     62     if (fopen(file, "r") || !env)
     63         return (file);
     64     else
     65 #ifdef _WIN32
     66     snprintf(path, sizeof(path), "%s%s%s", env, __PATH_ETC_INET, file);
     67 #else
     68     snprintf(path, sizeof(path), "%s%s", env, file);
     69 #endif
     70     return (path);
     71 }
     72 
     73 void
     74 setservent(int f)
     75 {
     76     if (servf == NULL)
     77         servf = fopen(etc_path(__PATH_SERVICES), "r");
     78     else
     79         rewind(servf);
     80     _serv_stayopen |= f;
     81 }
     82 
     83 void
     84 endservent(void)
     85 {
     86     if (servf) {
     87         fclose(servf);
     88         servf = NULL;
     89     }
     90     _serv_stayopen = 0;
     91 }
     92 
     93 struct servent *
     94 getservent(void)
     95 {
     96     char *p;
     97     char *cp, **q;
     98 
     99     if (servf == NULL && (servf = fopen(etc_path(__PATH_SERVICES), "r")) == NULL)
    100         return (NULL);
    101 
    102 again:
    103     if ((p = fgets(line, BUFSIZ, servf)) == NULL)
    104         return (NULL);
    105     if (*p == '#')
    106         goto again;
    107     cp = strpbrk(p, "#\n");
    108     if (cp == NULL)
    109         goto again;
    110     *cp = '\0';
    111     serv.s_name = p;
    112     p = strpbrk(p, " \t");
    113     if (p == NULL)
    114         goto again;
    115     *p++ = '\0';
    116     while (*p == ' ' || *p == '\t')
    117         p++;
    118     cp = strpbrk(p, ",/");
    119     if (cp == NULL)
    120         goto again;
    121     *cp++ = '\0';
    122     serv.s_port = htons((u_short)atoi(p));
    123     serv.s_proto = cp;
    124     q = serv.s_aliases = serv_aliases;
    125     cp = strpbrk(cp, " \t");
    126     if (cp != NULL)
    127         *cp++ = '\0';
    128     while (cp && *cp) {
    129         if (*cp == ' ' || *cp == '\t') {
    130             cp++;
    131             continue;
    132         }
    133         if (q < &serv_aliases[MAXALIASES - 1])
    134             *q++ = cp;
    135         cp = strpbrk(cp, " \t");
    136         if (cp != NULL)
    137             *cp++ = '\0';
    138     }
    139     *q = NULL;
    140     return (&serv);
    141 }
    142