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-rw-r--r--tools/rrdbot-get.c191
1 files changed, 130 insertions, 61 deletions
diff --git a/tools/rrdbot-get.c b/tools/rrdbot-get.c
index a6cc0bc..a1c904a 100644
--- a/tools/rrdbot-get.c
+++ b/tools/rrdbot-get.c
@@ -50,26 +50,30 @@
#include "server-mainloop.h"
#include "config-parser.h"
-/* The socket to use */
-static int snmp_socket = -1;
-/* Since we only deal with one packet at a time, global buffer */
-static unsigned char snmp_buffer[0x1000];
+#define RESEND_TIMEOUT 200 /* Time between SNMP resends */
+#define DEFAULT_TIMEOUT 5000 /* Default timeout for SNMP response */
+#define MAX_RETRIES 3 /* Number of SNMP packets we retry */
-/* The actual request data */
-static struct snmp_pdu snmp_data;
+struct context
+{
+ int socket; /* The socket to use */
+ unsigned char packet[0x1000]; /* The raw packet data to send */
+ struct snmp_pdu pdu; /* The actual request data */
+ struct asn_oid oid_first; /* The first OID we've done */
-/* The first OID we've done */
-static struct asn_oid oid_first;
+ struct sockaddr_any hostaddr; /* The remote host */
+ char* hostname; /* The remote host */
-/* The remote host */
-static struct sockaddr_any snmp_hostaddr;
-static char* snmp_hostname = NULL;
+ uint64_t lastsend; /* Time of last send */
+ int retries; /* Number of retries */
+ uint64_t timeout; /* Receive timeout */
-static int retries = 0;
+ int recursive; /* Whether we're going recursive or not */
+ int numeric; /* Print raw data */
+};
-static int recursive = 0; /* Whether we're going recursive or not */
-static int numeric = 0; /* Print raw data */
+static struct context ctx;
/* -----------------------------------------------------------------------------
* DUMMY CONFIG FUNCTIONS
@@ -98,17 +102,20 @@ send_req()
struct asn_buf b;
ssize_t ret;
- b.asn_ptr = snmp_buffer;
- b.asn_len = sizeof(snmp_buffer);
+ b.asn_ptr = ctx.packet;
+ b.asn_len = sizeof(ctx.packet);
- if(snmp_pdu_encode(&snmp_data, &b))
+ if(snmp_pdu_encode(&ctx.pdu, &b))
errx(1, "couldn't encode snmp buffer");
- ret = sendto(snmp_socket, snmp_buffer, b.asn_ptr - snmp_buffer, 0,
- &SANY_ADDR(snmp_hostaddr), SANY_LEN(snmp_hostaddr));
+ ret = sendto(ctx.socket, ctx.packet, b.asn_ptr - ctx.packet, 0,
+ &SANY_ADDR(ctx.hostaddr), SANY_LEN(ctx.hostaddr));
if(ret == -1)
- err(1, "couldn't send snmp packet to: %s", snmp_hostname);
+ err(1, "couldn't send snmp packet to: %s", ctx.hostname);
+ /* Some bookkeeping */
+ ctx.retries++;
+ ctx.lastsend = server_get_time();
}
static void
@@ -122,7 +129,7 @@ setup_req(char* uri)
/* Parse the SNMP URI */
copy = strdup(uri);
- msg = cfg_parse_uri(uri, &scheme, &snmp_hostname, &user, &path);
+ msg = cfg_parse_uri(uri, &scheme, &ctx.hostname, &user, &path);
if(msg)
errx(2, "%s: %s", msg, copy);
free(copy);
@@ -133,46 +140,52 @@ setup_req(char* uri)
if(strcmp(scheme, "snmp") != 0)
errx(2, "invalid scheme: %s", scheme);
- if(sock_any_pton(snmp_hostname, &snmp_hostaddr,
+ if(sock_any_pton(ctx.hostname, &ctx.hostaddr,
SANY_OPT_DEFPORT(161) | SANY_OPT_DEFLOCAL) == -1)
- err(1, "couldn't resolve host address (ignoring): %s", snmp_hostname);
+ err(1, "couldn't resolve host address (ignoring): %s", ctx.hostname);
- memset(&snmp_data, 0, sizeof(snmp_data));
- snmp_data.version = 1;
- snmp_data.request_id = 0;
- snmp_data.type = recursive ? SNMP_PDU_GETNEXT : SNMP_PDU_GET;
- snmp_data.error_status = 0;
- snmp_data.error_index = 0;
- strlcpy(snmp_data.community, user ? user : "public",
- sizeof(snmp_data.community));
+ memset(&ctx.pdu, 0, sizeof(ctx.pdu));
+ ctx.pdu.version = 1;
+ ctx.pdu.request_id = 0;
+ ctx.pdu.type = ctx.recursive ? SNMP_PDU_GETNEXT : SNMP_PDU_GET;
+ ctx.pdu.error_status = 0;
+ ctx.pdu.error_index = 0;
+ strlcpy(ctx.pdu.community, user ? user : "public",
+ sizeof(ctx.pdu.community));
/* And parse the OID */
- snmp_data.bindings[0].syntax = 0;
- memset(&(snmp_data.bindings[0].v), 0, sizeof(snmp_data.bindings[0].v));
- if(mib_parse(path, &(snmp_data.bindings[0].var)) == -1)
+ ctx.pdu.bindings[0].syntax = 0;
+ memset(&(ctx.pdu.bindings[0].v), 0, sizeof(ctx.pdu.bindings[0].v));
+ if(mib_parse(path, &(ctx.pdu.bindings[0].var)) == -1)
errx(2, "invalid MIB: %s", path);
/* Add an item to this request */
- snmp_data.nbindings = 1;
+ ctx.pdu.nbindings = 1;
/* Keep track of top for recursiveness */
- memcpy(&oid_first, &(snmp_data.bindings[0].var), sizeof(oid_first));
+ memcpy(&ctx.oid_first, &(ctx.pdu.bindings[0].var), sizeof(ctx.oid_first));
+ /* Reset bookkeeping */
+ ctx.retries = 0;
+ ctx.lastsend = 0;
}
static void
setup_next(struct snmp_value* value)
{
- snmp_data.request_id++;
- snmp_data.type = SNMP_PDU_GETNEXT;
+ ctx.pdu.request_id++;
+ ctx.pdu.type = SNMP_PDU_GETNEXT;
/* And parse the OID */
- memcpy(&(snmp_data.bindings[0]), value, sizeof(struct snmp_value));
- snmp_data.bindings[0].syntax = 0;
- snmp_data.nbindings = 1;
-}
+ memcpy(&(ctx.pdu.bindings[0]), value, sizeof(struct snmp_value));
+ ctx.pdu.bindings[0].syntax = 0;
+ ctx.pdu.nbindings = 1;
+ /* Reset bookkeeping */
+ ctx.retries = 0;
+ ctx.lastsend = 0;
+}
static int
print_resp(struct snmp_pdu* pdu, uint64_t when)
@@ -187,11 +200,13 @@ print_resp(struct snmp_pdu* pdu, uint64_t when)
{
value = &(pdu->bindings[i]);
- if(numeric)
- printf("%s: ", asn_oid2str(&(value->var)));
+ if(ctx.numeric)
+ printf("%s", asn_oid2str(&(value->var)));
else
mib_format(&(value->var), stdout);
+ printf(": ");
+
switch(value->syntax)
{
case SNMP_SYNTAX_NULL:
@@ -255,7 +270,7 @@ receive_resp(int fd, int type, void* arg)
/* Read in the packet */
SANY_LEN(from) = sizeof(from);
- len = recvfrom(snmp_socket, snmp_buffer, sizeof(snmp_buffer), 0,
+ len = recvfrom(ctx.socket, ctx.packet, sizeof(ctx.packet), 0,
&SANY_ADDR(from), &SANY_LEN(from));
if(len < 0)
{
@@ -268,7 +283,7 @@ receive_resp(int fd, int type, void* arg)
/* Now parse the packet */
- b.asn_ptr = snmp_buffer;
+ b.asn_ptr = ctx.packet;
b.asn_len = len;
ret = snmp_pdu_decode(&b, &pdu, &ip);
@@ -276,13 +291,12 @@ receive_resp(int fd, int type, void* arg)
errx(1, "invalid snmp packet received from: %s", hostname);
/* It needs to match something we're waiting for */
- if(pdu.request_id != snmp_data.request_id)
+ if(pdu.request_id != ctx.pdu.request_id)
return;
/* Check for errors */
if(pdu.error_status != SNMP_ERR_NOERROR)
{
- snmp_pdu_dump (&pdu);
msg = snmp_get_errmsg (pdu.error_status);
if(msg)
errx(1, "snmp error from host '%s': %s", hostname, msg);
@@ -296,15 +310,15 @@ receive_resp(int fd, int type, void* arg)
if(pdu.nbindings > 0)
{
val = &(pdu.bindings[pdu.nbindings - 1]);
- subid = asn_compare_oid(&oid_first, &(val->var)) == 0 ||
- asn_is_suboid(&oid_first, &(val->var));
+ subid = asn_compare_oid(&ctx.oid_first, &(val->var)) == 0 ||
+ asn_is_suboid(&ctx.oid_first, &(val->var));
}
/* Print the packet values */
- if(!recursive || subid)
+ if(!ctx.recursive || subid)
ret = print_resp(&pdu, server_get_time());
- if(ret && recursive && subid)
+ if(ret && ctx.recursive && subid)
{
/* If recursive, move onto next one */
setup_next(&(pdu.bindings[pdu.nbindings - 1]));
@@ -315,6 +329,23 @@ receive_resp(int fd, int type, void* arg)
server_stop ();
}
+static int
+send_timer(uint64_t when, void* arg)
+{
+ if(ctx.lastsend == 0)
+ return 1;
+
+ /* Check for timeouts */
+ if(ctx.lastsend + ctx.timeout < when)
+ errx(1, "timed out waiting for response from server");
+
+ /* Resend packets when no response */
+ if(ctx.retries < MAX_RETRIES && ctx.lastsend + RESEND_TIMEOUT < when)
+ send_req();
+
+ return 1;
+}
+
/* -----------------------------------------------------------------------------
* STARTUP
*/
@@ -322,7 +353,7 @@ receive_resp(int fd, int type, void* arg)
static void
usage()
{
- fprintf(stderr, "usage: rrdbot-get [-nr] snmp://community@host/oid\n");
+ fprintf(stderr, "usage: rrdbot-get [-Mnr] [-t timeout] [-m mibdir] snmp://community@host/oid\n");
fprintf(stderr, " rrdbot-get -V\n");
exit(2);
}
@@ -339,21 +370,45 @@ main(int argc, char* argv[])
{
struct sockaddr_in addr;
char ch;
+ char* t;
+
+ /* Defaults */
+ memset(&ctx, 0, sizeof(ctx));
+ ctx.socket = -1;
+ ctx.timeout = DEFAULT_TIMEOUT;
/* Parse the arguments nicely */
- while((ch = getopt(argc, argv, "nrV")) != -1)
+ while((ch = getopt(argc, argv, "m:Mnrt:V")) != -1)
{
switch(ch)
{
+ /* mib directory */
+ case 'm':
+ mib_directory = optarg;
+ break;
+
+ /* MIB load warnings */
+ case 'M':
+ mib_warnings = 1;
+ break;
+
/* Numeric output */
case 'n':
- numeric = 1;
+ ctx.numeric = 1;
break;
/* SNMP walk (recursive)*/
case 'r':
- recursive = 1;
+ ctx.recursive = 1;
+ break;
+
+ /* The timeout */
+ case 't':
+ ctx.timeout = strtoul(optarg, &t, 10);
+ if(*t)
+ errx(2, "invalid timeout: %s", optarg);
+ ctx.timeout *= 1000;
break;
/* Print version number */
@@ -375,22 +430,36 @@ main(int argc, char* argv[])
if(argc != 1)
usage();
- setup_req (argv[0]);
+ server_init();
+
+ setup_req(argv[0]);
/* Setup the SNMP socket */
- snmp_socket = socket(PF_INET, SOCK_DGRAM, 0);
- if(snmp_socket < 0)
+ ctx.socket = socket(PF_INET, SOCK_DGRAM, 0);
+ if(ctx.socket < 0)
err(1, "couldn't open snmp socket");
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
- if(bind(snmp_socket, (struct sockaddr*)&addr, sizeof(addr)) < 0)
+ if(bind(ctx.socket, (struct sockaddr*)&addr, sizeof(addr)) < 0)
err(1, "couldn't listen on port");
- if(server_watch(snmp_socket, SERVER_READ, receive_resp, NULL) == -1)
+ if(server_watch(ctx.socket, SERVER_READ, receive_resp, NULL) == -1)
err(1, "couldn't listen on socket");
+ /* Send off first request */
send_req();
+ /* We fire off the resend timer every 1/5 second */
+ if(server_timer(RESEND_TIMEOUT, send_timer, NULL) == -1)
+ err(1, "couldn't setup timer");
+
+ /* Wait for responses */
server_run();
+ /* Done */
+ server_unwatch(ctx.socket);
+ close(ctx.socket);
+
+ server_uninit();
+
return 0;
}