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https://github.com/the-tcpdump-group/tcpdump.git
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c499612a7f
Some versions of the MSVC runtime library have a non-C99-compliant
vsnprintf(), which we want to avoid. On Windows, use snprintf() and
vsnprintf() for VS 2015 and later, where they both exist in
C99-compliant forms, and wrap _{v}snprintf_s() otherwise (they're
guaranteed to do the null termination that we want).
144 lines
4.3 KiB
C
144 lines
4.3 KiB
C
/*
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* Copyright (c) 1983, 1993 The Regents of the University of California.
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* Copyright (c) 1993 Digital Equipment Corporation.
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* Copyright (c) 2012 G. Vanem <gvanem@yahoo.no>.
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* Copyright (c) 2017 Ali Abdulkadir <autostart.ini@gmail.com>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <netdissect-stdinc.h>
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#include <getservent.h>
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static FILE *servf = NULL;
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static char line[BUFSIZ+1];
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static struct servent serv;
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static char *serv_aliases[MAXALIASES];
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int _serv_stayopen;
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const char *etc_path(const char *file);
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/*
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* Check if <file> exists in the current directory and, if so, return it.
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* Else return either "%SYSTEMROOT%\System32\drivers\etc\<file>"
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* or $PREFIX/etc/<file>.
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* "<file>" is aka __PATH_SERVICES (aka "services" on Windows and
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* "/etc/services" on other platforms that would need this).
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*/
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const char *etc_path(const char *file)
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{
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const char *env = getenv(__PATH_SYSROOT);
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static char path[_MAX_PATH];
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/* see if "<file>" exists locally or whether __PATH_SYSROOT is valid */
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if (fopen(file, "r") || !env)
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return (file);
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else
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#ifdef _WIN32
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nd_snprintf(path, sizeof(path), "%s%s%s", env, __PATH_ETC_INET, file);
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#else
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nd_snprintf(path, sizeof(path), "%s%s", env, file);
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#endif
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return (path);
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}
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void
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setservent(int f)
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{
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if (servf == NULL)
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servf = fopen(etc_path(__PATH_SERVICES), "r");
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else
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rewind(servf);
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_serv_stayopen |= f;
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}
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void
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endservent(void)
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{
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if (servf) {
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fclose(servf);
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servf = NULL;
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}
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_serv_stayopen = 0;
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}
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struct servent *
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getservent(void)
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{
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char *p;
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char *cp, **q;
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if (servf == NULL && (servf = fopen(etc_path(__PATH_SERVICES), "r")) == NULL)
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return (NULL);
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again:
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if ((p = fgets(line, BUFSIZ, servf)) == NULL)
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return (NULL);
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if (*p == '#')
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goto again;
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cp = strpbrk(p, "#\n");
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if (cp == NULL)
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goto again;
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*cp = '\0';
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serv.s_name = p;
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p = strpbrk(p, " \t");
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if (p == NULL)
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goto again;
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*p++ = '\0';
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while (*p == ' ' || *p == '\t')
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p++;
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cp = strpbrk(p, ",/");
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if (cp == NULL)
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goto again;
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*cp++ = '\0';
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serv.s_port = htons((u_short)atoi(p));
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serv.s_proto = cp;
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q = serv.s_aliases = serv_aliases;
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cp = strpbrk(cp, " \t");
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if (cp != NULL)
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*cp++ = '\0';
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while (cp && *cp) {
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if (*cp == ' ' || *cp == '\t') {
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cp++;
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continue;
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}
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if (q < &serv_aliases[MAXALIASES - 1])
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*q++ = cp;
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cp = strpbrk(cp, " \t");
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if (cp != NULL)
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*cp++ = '\0';
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}
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*q = NULL;
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return (&serv);
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}
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