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#include <net-snmp/net-snmp-config.h>
#include <net-snmp/types.h>
#include <net-snmp/library/system.h>
#include <net-snmp/library/snmpIPBaseDomain.h>
#include <ctype.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
static int netsnmp_isnumber(const char *cp)
{
if (!*cp)
return 0;
while (isdigit((unsigned char)*cp))
cp++;
return *cp == '\0';
}
/**
* Parse a Net-SNMP endpoint name.
* @ep_str: Parsed endpoint name.
* @endpoint: Endpoint specification in the format
* <address>[@<iface>]:[<port>], <address>[@<iface>] or <port>.
*
* Only overwrite those fields of *@ep_str that have been set in
* @endpoint. Returns 1 upon success and 0 upon failure.
*/
int netsnmp_parse_ep_str(struct netsnmp_ep_str *ep_str, const char *endpoint)
{
char *dup, *cp, *addrstr = NULL, *iface = NULL, *portstr = NULL;
unsigned port;
if (!endpoint)
return 0;
dup = strdup(endpoint);
if (!dup)
return 0;
cp = dup;
if (netsnmp_isnumber(cp)) {
portstr = cp;
} else {
if (*cp == '[') {
addrstr = cp + 1;
cp = strchr(cp, ']');
if (cp) {
cp[0] = '\0';
cp++;
} else {
goto invalid;
}
} else if (*cp != '@' && (*cp != ':' || cp[1] == ':')) {
addrstr = cp;
cp = strchr(addrstr, '@');
if (!cp) {
cp = strrchr(addrstr, ':');
if (cp && strchr(dup, ':') < cp)
cp = NULL;
}
}
if (cp && *cp == '@') {
*cp = '\0';
iface = cp + 1;
cp = strchr(cp + 1, ':');
}
if (cp && *cp == ':') {
*cp++ = '\0';
portstr = cp;
if (!netsnmp_isnumber(cp))
goto invalid;
} else if (cp && *cp) {
goto invalid;
}
}
if (addrstr)
strlcpy(ep_str->addr, addrstr, sizeof(ep_str->addr));
if (iface)
strlcpy(ep_str->iface, iface, sizeof(ep_str->iface));
if (portstr) {
port = atoi(portstr);
if (port <= 0xffff)
strlcpy(ep_str->port, portstr, sizeof(ep_str->port));
else
goto invalid;
}
free(dup);
return 1;
invalid:
free(dup);
return 0;
}
int netsnmp_bindtodevice(int fd, const char *iface)
{
/* If no interface name has been specified, report success. */
if (!iface || iface[0] == '\0')
return 0;
#ifdef HAVE_SO_BINDTODEVICE
/*
* +1 to work around the Linux kernel bug that the passed in name is not
* '\0'-terminated.
*/
int ifacelen = strlen(iface) + 1;
int ret;
ret = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, iface, ifacelen);
if (ret < 0)
snmp_log(LOG_ERR, "Binding socket to interface %s failed: %s\n", iface,
strerror(errno));
return ret;
#else
errno = EINVAL;
return -1;
#endif
}
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