简单网络协议SNMP之net-snmp开发snmpget
简单网络协议SNMP之net-snmp开发snmpget
目的：通过net-snmp关于snmpget源码的开发，从snmp代理设备获得自己想要的信息
准备：从http://www.net-snmp.org/网址下载net-snmp-5.6.1.1.tar.gz源码包
开发过程：
1.解压源码
2.进入解压源码的目录
1) Run ./configure --prefix=/usr/local/net-snmp
(type "./configure --help" for a quick usage summary.)
(--prefix=PATH will change the default /usr/local installation path.)
(see "Compilers and Options" on changing the compiler to use)
2) make
3) make install
3.安装完毕
在/usr/local/net-snmp底下内容如下：
root@an-virtual-machine:/usr/local/net-snmp# ls
bin include lib sbin share
进入lib,可以看到内容如下：
root@an-virtual-machine:/usr/local/net-snmp/lib# ls
libnetsnmp.a libnetsnmpmibs.la
libnetsnmpagent.a libnetsnmpmibs.so
libnetsnmpagent.la libnetsnmpmibs.so.25
libnetsnmpagent.so libnetsnmpmibs.so.25.0.2
libnetsnmpagent.so.25 libnetsnmp.so
libnetsnmpagent.so.25.0.2 libnetsnmp.so.25
libnetsnmphelpers.a libnetsnmp.so.25.0.2
libnetsnmphelpers.la libnetsnmptrapd.a
libnetsnmphelpers.so libnetsnmptrapd.la
libnetsnmphelpers.so.25 libnetsnmptrapd.so
libnetsnmphelpers.so.25.0.2 libnetsnmptrapd.so.25
libnetsnmp.la libnetsnmptrapd.so.25.0.2
libnetsnmpmibs.a
4.在Qtcreator，新建一个项目TestNetSNMp
把上面lib里面的libnetsnmp.a 放到项目底下
在.pro里面添加内容如下：
INCLUDEPATH +=/usr/local/net-snmp/include
LIBS += -L/root/wyz/TestNetSNMP -lnetsnmp
5.在main里面添加代码如下：
- #include <net-snmp/net-snmp-config.h>
- #if HAVE_STDLIB_H
- #include <stdlib.h>
- #endif
- #if HAVE_UNISTD_H
- #include <unistd.h>
- #endif
- #if HAVE_STRING_H
- #include <string.h>
- #else
- #include <strings.h>
- #endif
- #include <sys/types.h>
- #if HAVE_NETINET_IN_H
- #include <netinet/in.h>
- #endif
- #include <stdio.h>
- #include <ctype.h>
- #if TIME_WITH_SYS_TIME
- # ifdef WIN32
- # include <sys/timeb.h>
- # else
- # include <sys/time.h>
- # endif
- # include <time.h>
- #else
- # if HAVE_SYS_TIME_H
- # include <sys/time.h>
- # else
- # include <time.h>
- # endif
- #endif
- #if HAVE_SYS_SELECT_H
- #include <sys/select.h>
- #endif
- #if HAVE_WINSOCK_H
- #include <winsock.h>
- #endif
- #if HAVE_NETDB_H
- #include <netdb.h>
- #endif
- #if HAVE_ARPA_INET_H
- #include <arpa/inet.h>
- #endif
- #include <net-snmp/utilities.h>
- #include <net-snmp/net-snmp-includes.h>
- #include <vector>
- #include <map>
- #include <iostream>
- using namespace std;
- #define NETSNMP_DS_APP_DONT_FIX_PDUS 0
- string fprint_variable_1(const oid * objid,size_t objidlen, const netsnmp_variable_list * variable)
- {
- u_char *buf = NULL;
- size_t buf_len = 256, out_len = 0;
- if ((buf = (u_char *) calloc(buf_len, 1)) == NULL) {
- return "";
- } else {
- if (sprint_realloc_variable(&buf, &buf_len, &out_len, 1,
- objid, objidlen, variable)) {
- string strTemp((char*)buf);
- int iFirst=strTemp.find_first_of(":");
- string strInfo=strTemp.substr(iFirst,strTemp.length()-1);
- return strInfo;
- } else {
- fprintf(stdout, "%s [TRUNCATED]\n", buf);
- }
- }
- SNMP_FREE(buf);
- }
- string fprint_variable_2(const oid * objid,size_t objidlen, const netsnmp_variable_list * variable)
- {
- u_char *buf = NULL;
- size_t buf_len = 256, out_len = 0;
- if ((buf = (u_char *) calloc(buf_len, 1)) == NULL) {
- return "";
- } else {
- if (sprint_realloc_variable(&buf, &buf_len, &out_len, 1,
- objid, objidlen, variable)) {
- string strTemp((char*)buf);
- return strTemp;
- } else {
- fprintf(stdout, "%s [TRUNCATED]\n", buf);
- }
- }
- SNMP_FREE(buf);
- }
- string SnmpGet(char *community,char *ip,char *oid_array)//snmpget -v2c -c public 10.0.0.11 1.3.6.1.2.1.1.5.0
- {
- netsnmp_session session, *ss=(netsnmp_session*)malloc(sizeof(netsnmp_session));
- netsnmp_pdu *response=(netsnmp_pdu*)malloc(sizeof(netsnmp_pdu));
- netsnmp_variable_list *vars=NULL;
- netsnmp_pdu *pdu;
- if(!ss)
- ss = (netsnmp_session*)malloc(sizeof(netsnmp_session));
- if(!response)
- response=(netsnmp_pdu*)malloc(sizeof(netsnmp_pdu));
- int count;
- int current_name = 0;
- char *names[SNMP_MAX_CMDLINE_OIDS];
- oid name[MAX_OID_LEN];
- size_t name_length;
- int status;
- int failures = 0;
- int exitval = 0;
- snmp_sess_init(&session);
- session.version = SNMP_VERSION_2c;
- session.peername = ip;
- session.community = (unsigned char*)community;
- session.community_len = strlen(community);
- names[0] = oid_array;
- current_name = 1;
- SOCK_STARTUP;
- snmp_close(ss);
- ss = snmp_open(&session);
- if (ss == NULL) {
- snmp_sess_perror("snmpget", &session);
- SOCK_CLEANUP;
- return "";
- }
- pdu = snmp_pdu_create(SNMP_MSG_GET);
- for (count = 0; count < current_name; count++) {
- name_length = MAX_OID_LEN;
- if (!snmp_parse_oid(names[count], name, &name_length)) {
- snmp_perror(names[count]);
- failures++;
- }
- else
- {
- snmp_add_null_var(pdu, name, name_length);
- }
- }
- if (failures) {
- snmp_close(ss);
- SOCK_CLEANUP;
- return "";
- }
- retry:
- status = snmp_synch_response(ss, pdu, &response);
- if (status == STAT_SUCCESS) {
- if (response->errstat == SNMP_ERR_NOERROR)
- {
- vars = response->variables;
- string strTemp=fprint_variable_1(vars->name, vars->name_length, vars);
- return strTemp;
- }
- else
- {
- printf("2\n");
- fprintf(stderr, "Error in packet\nReason: %s\n",
- snmp_errstring(response->errstat));
- if (response->errindex != 0) {
- fprintf(stderr, "Failed object: ");
- for (count = 1, vars = response->variables;
- vars && count != response->errindex;
- vars = vars->next_variable, count++)
- /*EMPTY*/;
- if (vars) {
- fprint_objid(stderr, vars->name, vars->name_length);
- }
- fprintf(stderr, "\n");
- }
- exitval = 2;
- if (!netsnmp_ds_get_boolean(NETSNMP_DS_APPLICATION_ID,
- NETSNMP_DS_APP_DONT_FIX_PDUS)) {
- pdu = snmp_fix_pdu(response, SNMP_MSG_GET);
- snmp_free_pdu(response);
- response = NULL;
- if (pdu != NULL) {
- goto retry;
- }
- }
- } /* endif -- SNMP_ERR_NOERROR */
- } else if (status == STAT_TIMEOUT) {
- fprintf(stderr, "Timeout: No Response from %s.\n",
- session.peername);
- exitval = 1;
- } else { /* status == STAT_ERROR */
- snmp_sess_perror("snmpget", ss);
- exitval = 1;
- } /* endif -- STAT_SUCCESS */
- if (response)
- snmp_free_pdu(response);
- snmp_close(ss);
- SOCK_CLEANUP;
- return "";
- }
- int main()
- {
- string strSnmpInfo;
- // strSnmpInfo=SnmpGet("2c","public","192.168.1.241",".1.3.6.1.4.1.11.2.3.9.1.1.7.0");
- // strSnmpInfo=SnmpGet("2c","public","192.168.1.241",".1.3.6.1.2.1.1.1.0");
- strSnmpInfo=SnmpGet("public","192.168.1.133","1.3.6.1.2.1.1.1.0");
- cout<<"wyz---------------snmpInfo::"<<strSnmpInfo<<endl;
- return 0;
- }
#include <net-snmp/net-snmp-config.h>
#if HAVE_STDLIB_H
#include <stdlib.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif
#include <sys/types.h>
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#include <stdio.h>
#include <ctype.h>
#if TIME_WITH_SYS_TIME
# ifdef WIN32
# include <sys/timeb.h>
# else
# include <sys/time.h>
# endif
# include <time.h>
#else
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#if HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#if HAVE_WINSOCK_H
#include <winsock.h>
#endif
#if HAVE_NETDB_H
#include <netdb.h>
#endif
#if HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#include <net-snmp/utilities.h>
#include <net-snmp/net-snmp-includes.h>
#include <vector>
#include <map>
#include <iostream>
using namespace std;
#define NETSNMP_DS_APP_DONT_FIX_PDUS 0
string fprint_variable_1(const oid * objid,size_t objidlen, const netsnmp_variable_list * variable)
{
u_char *buf = NULL;
size_t buf_len = 256, out_len = 0;
if ((buf = (u_char *) calloc(buf_len, 1)) == NULL) {
return "";
} else {
if (sprint_realloc_variable(&buf, &buf_len, &out_len, 1,
objid, objidlen, variable)) {
string strTemp((char*)buf);
int iFirst=strTemp.find_first_of(":");
string strInfo=strTemp.substr(iFirst,strTemp.length()-1);
return strInfo;
} else {
fprintf(stdout, "%s [TRUNCATED]\n", buf);
}
}
SNMP_FREE(buf);
}
string fprint_variable_2(const oid * objid,size_t objidlen, const netsnmp_variable_list * variable)
{
u_char *buf = NULL;
size_t buf_len = 256, out_len = 0;
if ((buf = (u_char *) calloc(buf_len, 1)) == NULL) {
return "";
} else {
if (sprint_realloc_variable(&buf, &buf_len, &out_len, 1,
objid, objidlen, variable)) {
string strTemp((char*)buf);
return strTemp;
} else {
fprintf(stdout, "%s [TRUNCATED]\n", buf);
}
}
SNMP_FREE(buf);
}
string SnmpGet(char *community,char *ip,char *oid_array)//snmpget -v2c -c public 10.0.0.11 1.3.6.1.2.1.1.5.0
{
netsnmp_session session, *ss=(netsnmp_session*)malloc(sizeof(netsnmp_session));
netsnmp_pdu *response=(netsnmp_pdu*)malloc(sizeof(netsnmp_pdu));
netsnmp_variable_list *vars=NULL;
netsnmp_pdu *pdu;
if(!ss)
ss = (netsnmp_session*)malloc(sizeof(netsnmp_session));
if(!response)
response=(netsnmp_pdu*)malloc(sizeof(netsnmp_pdu));
int count;
int current_name = 0;
char *names[SNMP_MAX_CMDLINE_OIDS];
oid name[MAX_OID_LEN];
size_t name_length;
int status;
int failures = 0;
int exitval = 0;
snmp_sess_init(&session);
session.version = SNMP_VERSION_2c;
session.peername = ip;
session.community = (unsigned char*)community;
session.community_len = strlen(community);
names[0] = oid_array;
current_name = 1;
SOCK_STARTUP;
snmp_close(ss);
ss = snmp_open(&session);
if (ss == NULL) {
snmp_sess_perror("snmpget", &session);
SOCK_CLEANUP;
return "";
}
pdu = snmp_pdu_create(SNMP_MSG_GET);
for (count = 0; count < current_name; count++) {
name_length = MAX_OID_LEN;
if (!snmp_parse_oid(names[count], name, &name_length)) {
snmp_perror(names[count]);
failures++;
}
else
{
snmp_add_null_var(pdu, name, name_length);
}
}
if (failures) {
snmp_close(ss);
SOCK_CLEANUP;
return "";
}
retry:
status = snmp_synch_response(ss, pdu, &response);
if (status == STAT_SUCCESS) {
if (response->errstat == SNMP_ERR_NOERROR)
{
vars = response->variables;
string strTemp=fprint_variable_1(vars->name, vars->name_length, vars);
return strTemp;
}
else
{
printf("2\n");
fprintf(stderr, "Error in packet\nReason: %s\n",
snmp_errstring(response->errstat));
if (response->errindex != 0) {
fprintf(stderr, "Failed object: ");
for (count = 1, vars = response->variables;
vars && count != response->errindex;
vars = vars->next_variable, count++)
/*EMPTY*/;
if (vars) {
fprint_objid(stderr, vars->name, vars->name_length);
}
fprintf(stderr, "\n");
}
exitval = 2;
if (!netsnmp_ds_get_boolean(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_APP_DONT_FIX_PDUS)) {
pdu = snmp_fix_pdu(response, SNMP_MSG_GET);
snmp_free_pdu(response);
response = NULL;
if (pdu != NULL) {
goto retry;
}
}
} /* endif -- SNMP_ERR_NOERROR */
} else if (status == STAT_TIMEOUT) {
fprintf(stderr, "Timeout: No Response from %s.\n",
session.peername);
exitval = 1;
} else { /* status == STAT_ERROR */
snmp_sess_perror("snmpget", ss);
exitval = 1;
} /* endif -- STAT_SUCCESS */
if (response)
snmp_free_pdu(response);
snmp_close(ss);
SOCK_CLEANUP;
return "";
}
int main()
{
string strSnmpInfo;
// strSnmpInfo=SnmpGet("2c","public","192.168.1.241",".1.3.6.1.4.1.11.2.3.9.1.1.7.0");
// strSnmpInfo=SnmpGet("2c","public","192.168.1.241",".1.3.6.1.2.1.1.1.0");
strSnmpInfo=SnmpGet("public","192.168.1.133","1.3.6.1.2.1.1.1.0");
cout<<"wyz---------------snmpInfo::"<<strSnmpInfo<<endl;
return 0;
}
编译，运行结果如下：
root@an-virtual-machine:~/wyz/TestNetSNMP-build-desktop# ./TestNetSNMP
wyz---------------snmpInfo::: "Linux an-virtual-machine 2.6.35-22-generic #33-Ubuntu SMP Sun Sep 19 20:34:50 UTC 2010 i686"