diff options
| author | Ted Lemon <source@isc.org> | 2001-05-02 06:36:54 +0000 |
|---|---|---|
| committer | Ted Lemon <source@isc.org> | 2001-05-02 06:36:54 +0000 |
| commit | 615a574a25a6015aa246699609f38339bdad4ef2 (patch) | |
| tree | af733eb3fe16ffe1dce3b6e457eac5903e0aa8b5 /common | |
| parent | 24f9d67e03f5e844a2e59e06c17eaa14289e6838 (diff) | |
| download | isc-dhcp-615a574a25a6015aa246699609f38339bdad4ef2.tar.gz | |
Tweak the SIOCGIFCONF code once again.
Diffstat (limited to 'common')
| -rw-r--r-- | common/discover.c | 34 |
1 files changed, 16 insertions, 18 deletions
diff --git a/common/discover.c b/common/discover.c index 6c3c8d91..6619fb27 100644 --- a/common/discover.c +++ b/common/discover.c @@ -43,7 +43,7 @@ #ifndef lint static char copyright[] = -"$Id: discover.c,v 1.41 2001/04/09 01:03:12 mellon Exp $ Copyright (c) 1995-2001 The Internet Software Consortium. All rights reserved.\n"; +"$Id: discover.c,v 1.42 2001/05/02 06:36:54 mellon Exp $ Copyright (c) 1995-2001 The Internet Software Consortium. All rights reserved.\n"; #endif /* not lint */ #include "dhcpd.h" @@ -159,8 +159,7 @@ void discover_interfaces (state) /* Get the interface configuration information... */ -#ifdef SIOCGIFCONF_NULL_BUF_GIVES_CORRECT_LEN - +#ifdef SIOCGIFCONF_ZERO_PROBE /* linux will only tell us how long a buffer it wants if we give it * a null buffer first. So, do a dry run to figure out the length. * @@ -171,24 +170,13 @@ void discover_interfaces (state) ic.ifc_len = 0; ic.ifc_ifcu.ifcu_buf = (caddr_t)NULL; - - i = ioctl(sock, SIOCGIFCONF, &ic); - if (i < 0) - log_fatal ("ioctl: SIOCGIFCONF: %m"); - - ic.ifc_ifcu.ifcu_buf = dmalloc ((size_t)ic.ifc_len, MDL); - if (!ic.ifc_ifcu.ifcu_buf) - log_fatal ("Can't allocate SIOCGIFCONF buffer."); - -#else /* SIOCGIFCONF_NULL_BUF_GIVES_CORRECT_LEN */ - +#else /* otherwise, we just feed it a starting size, and it'll tell us if * it needs more */ ic.ifc_len = sizeof buf; ic.ifc_ifcu.ifcu_buf = (caddr_t)buf; - -#endif /* SIOCGIFCONF_NULL_BUF_GIVES_CORRECT_LEN */ +#endif gifconf_again: i = ioctl(sock, SIOCGIFCONF, &ic); @@ -198,13 +186,23 @@ void discover_interfaces (state) /* If the SIOCGIFCONF resulted in more data than would fit in a buffer, allocate a bigger buffer. */ - if (ic.ifc_ifcu.ifcu_buf == buf && - ic.ifc_len > sizeof buf) { + if ((ic.ifc_ifcu.ifcu_buf == buf +#ifdef SIOCGIFCONF_ZERO_PROBE + || ic.ifc_ifcu.ifcu_buf == 0 +#endif + ) && ic.ifc_len > sizeof buf) { ic.ifc_ifcu.ifcu_buf = dmalloc ((size_t)ic.ifc_len, MDL); if (!ic.ifc_ifcu.ifcu_buf) log_fatal ("Can't allocate SIOCGIFCONF buffer."); goto gifconf_again; +#ifdef SIOCGIFCONF_ZERO_PROBE + } else if (ic.ifc_ifcu.ifcu_buf == 0) { + ic.ifc_ifcu.ifcu_buf = (caddr_t)buf; + if.ifc_len = sizeof buf; + goto gifconf_again; +#endif } + /* If we already have a list of interfaces, and we're running as a DHCP server, the interfaces were requested. */ |