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@yahoo.no>.
5 * Copyright (c) 2017 Ali Abdulkadir <autostart.ini@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 */
etc_path(const char * file)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
setservent(int f)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
endservent(void)84 endservent(void)
85 {
86 if (servf) {
87 fclose(servf);
88 servf = NULL;
89 }
90 _serv_stayopen = 0;
91 }
92
93 struct servent *
getservent(void)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