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diff -urNp a/agent/mibgroup/mibII/ipAddr.c b/agent/mibgroup/mibII/ipAddr.c
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--- a/agent/mibgroup/mibII/ipAddr.c 2020-06-10 14:14:30.113696471 +0200
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+++ b/agent/mibgroup/mibII/ipAddr.c 2020-06-10 14:27:15.345354018 +0200
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@@ -495,14 +495,16 @@ Address_Scan_Next(Index, Retin_ifaddr)
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}
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#elif defined(linux)
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+#include <errno.h>
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static struct ifreq *ifr;
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static int ifr_counter;
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static void
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Address_Scan_Init(void)
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{
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- int num_interfaces = 0;
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+ int i;
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int fd;
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+ int lastlen = 0;
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/* get info about all interfaces */
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@@ -510,28 +512,45 @@ Address_Scan_Init(void)
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SNMP_FREE(ifc.ifc_buf);
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ifr_counter = 0;
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- do
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- {
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if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
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{
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DEBUGMSGTL(("snmpd", "socket open failure in Address_Scan_Init\n"));
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return;
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}
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- num_interfaces += 16;
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- ifc.ifc_len = sizeof(struct ifreq) * num_interfaces;
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- ifc.ifc_buf = (char*) realloc(ifc.ifc_buf, ifc.ifc_len);
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-
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- if (ioctl(fd, SIOCGIFCONF, &ifc) < 0)
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- {
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- ifr=NULL;
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- close(fd);
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- return;
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- }
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- close(fd);
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+ /*
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+ * Cope with lots of interfaces and brokenness of ioctl SIOCGIFCONF
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+ * on some platforms; see W. R. Stevens, ``Unix Network Programming
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+ * Volume I'', p.435...
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+ */
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+
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+ for (i = 8;; i *= 2) {
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+ ifc.ifc_len = sizeof(struct ifreq) * i;
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+ ifc.ifc_req = calloc(i, sizeof(struct ifreq));
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+
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+ if (ioctl(fd, SIOCGIFCONF, &ifc) < 0) {
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+ if (errno != EINVAL || lastlen != 0) {
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+ /*
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+ * Something has gone genuinely wrong...
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+ */
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+ snmp_log(LOG_ERR, "bad rc from ioctl, errno %d", errno);
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+ SNMP_FREE(ifc.ifc_buf);
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+ close(fd);
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+ return;
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+ }
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+ } else {
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+ if (ifc.ifc_len == lastlen) {
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+ /*
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+ * The length is the same as the last time; we're done...
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+ */
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+ break;
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+ }
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+ lastlen = ifc.ifc_len;
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+ }
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+ free(ifc.ifc_buf); /* no SNMP_FREE, getting ready to reassign */
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}
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- while (ifc.ifc_len >= (sizeof(struct ifreq) * num_interfaces));
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-
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+
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+ close(fd);
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ifr = ifc.ifc_req;
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}
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