1 /*
2 * Copyright (C) 1996-2021 The Squid Software Foundation and contributors
3 *
4 * Squid software is distributed under GPLv2+ license and includes
5 * contributions from numerous individuals and organizations.
6 * Please see the COPYING and CONTRIBUTORS files for details.
7 */
8
9 /**********************************************************************
10 *
11 * Copyright 1997 by Carnegie Mellon University
12 *
13 * All Rights Reserved
14 *
15 * Permission to use, copy, modify, and distribute this software and its
16 * documentation for any purpose and without fee is hereby granted,
17 * provided that the above copyright notice appear in all copies and that
18 * both that copyright notice and this permission notice appear in
19 * supporting documentation, and that the name of CMU not be
20 * used in advertising or publicity pertaining to distribution of the
21 * software without specific, written prior permission.
22 *
23 * CMU DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
24 * ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
25 * CMU BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
26 * ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
27 * WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
28 * ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
29 * SOFTWARE.
30 *
31 **********************************************************************/
32
33 #include "squid.h"
34
35 #if HAVE_UNISTD_H
36 #include <unistd.h>
37 #endif
38 #if HAVE_STDLIB_H
39 #include <stdlib.h>
40 #endif
41 #if HAVE_SYS_TYPES_H
42 #include <sys/types.h>
43 #endif
44 #if HAVE_CTYPE_H
45 #include <ctype.h>
46 #endif
47 #if HAVE_GNUMALLOC_H
48 #include <gnumalloc.h>
49 #elif HAVE_MALLOC_H
50 #include <malloc.h>
51 #endif
52 #if HAVE_MEMORY_H
53 #include <memory.h>
54 #endif
55 #if HAVE_STRING_H
56 #include <string.h>
57 #endif
58 #if HAVE_STRINGS_H
59 #include <strings.h>
60 #endif
61 #if HAVE_BSTRING_H
62 #include <bstring.h>
63 #endif
64 #if HAVE_SYS_SOCKET_H
65 #include <sys/socket.h>
66 #endif
67 #if HAVE_NETINET_IN_H
68 #include <netinet/in.h>
69 #endif
70 #if HAVE_ARPA_INET_H
71 #include <arpa/inet.h>
72 #endif
73 #if HAVE_SYS_TIME_H
74 #include <sys/time.h>
75 #endif
76 #if HAVE_NETDB_H
77 #include <netdb.h>
78 #endif
79
80 #include "asn1.h"
81 #include "snmp.h"
82
83 #include "snmp-internal.h"
84 #include "snmp_error.h"
85 #include "snmp_impl.h"
86 #include "snmp_msg.h"
87 #include "snmp_pdu.h"
88 #include "snmp_session.h"
89 #include "snmp_vars.h"
90
91 #include "snmp_api.h"
92 #include "snmp_api_error.h"
93 #include "snmp_api_util.h"
94
95 #include "util.h"
96
97 /**********************************************************************/
98
99 /*
100 * Takes a session and a pdu and serializes the ASN PDU into the area
101 * pointed to by packet. out_length is the size of the data area available.
102 * Returns the length of the encoded packet in out_length. If an error
103 * occurs, -1 is returned. If all goes well, 0 is returned.
104 */
105 int
snmp_build(session,pdu,packet,out_length)106 snmp_build(session, pdu, packet, out_length)
107 struct snmp_session *session;
108 struct snmp_pdu *pdu;
109 u_char *packet;
110 int *out_length;
111 {
112 u_char *bufp;
113
114 bufp = snmp_msg_Encode(packet, out_length,
115 session->community, session->community_len,
116 session->Version,
117 pdu);
118 snmplib_debug(8, "LIBSNMP: snmp_build(): Packet len %d (requid %d)\n",
119 *out_length, pdu->reqid);
120
121 if (bufp == NULL)
122 return (-1);
123
124 return (0);
125 }
126
127 /*
128 * Parses the packet received on the input session, and places the data into
129 * the input pdu. length is the length of the input packet. If any errors
130 * are encountered, NULL is returned. If not, the community is.
131 */
132 u_char *
snmp_parse(struct snmp_session * session,struct snmp_pdu * pdu,u_char * data,int length)133 snmp_parse(struct snmp_session * session,
134 struct snmp_pdu * pdu,
135 u_char * data,
136 int length)
137 {
138 u_char Community[128];
139 u_char *bufp;
140 int CommunityLen = 128;
141
142 /* Decode the entire message. */
143 data = snmp_msg_Decode(data, &length,
144 Community, &CommunityLen,
145 &session->Version, pdu);
146 if (data == NULL)
147 return (NULL);
148
149 bufp = (u_char *) xmalloc(CommunityLen + 1);
150 if (bufp == NULL)
151 return (NULL);
152
153 strncpy((char *) bufp, (char *) Community, CommunityLen);
154 bufp[CommunityLen] = '\0';
155
156 session->community = bufp;
157 session->community_len = CommunityLen;
158
159 return (bufp);
160 }
161
162