diff options
| -rw-r--r-- | usr.sbin/rarpd/rarpd.c | 33 |
1 files changed, 23 insertions, 10 deletions
diff --git a/usr.sbin/rarpd/rarpd.c b/usr.sbin/rarpd/rarpd.c index 05a5d2c779e..6a7640f588d 100644 --- a/usr.sbin/rarpd/rarpd.c +++ b/usr.sbin/rarpd/rarpd.c @@ -1,4 +1,4 @@ -/* $OpenBSD: rarpd.c,v 1.14 1997/09/17 21:10:10 niklas Exp $ */ +/* $OpenBSD: rarpd.c,v 1.15 1997/09/18 08:05:47 deraadt Exp $ */ /* $NetBSD: rarpd.c,v 1.12 1996/03/21 18:28:23 jtc Exp $ */ /* @@ -28,7 +28,7 @@ char copyright[] = #endif /* not lint */ #ifndef lint -static char rcsid[] = "$OpenBSD: rarpd.c,v 1.14 1997/09/17 21:10:10 niklas Exp $"; +static char rcsid[] = "$OpenBSD: rarpd.c,v 1.15 1997/09/18 08:05:47 deraadt Exp $"; #endif @@ -600,12 +600,12 @@ lookup_eaddr(ifname, eaddr) char *ifname; u_char *eaddr; { - char inbuf[8192]; + char *inbuf = NULL; struct ifconf ifc; struct ifreq *ifr; struct sockaddr_dl *sdl; int fd; - int i, len; + int i, len, inlen = 8192; /* We cannot use SIOCGIFADDR on the BPF descriptor. We must instead get all the interfaces with SIOCGIFCONF @@ -617,13 +617,24 @@ lookup_eaddr(ifname, eaddr) /* NOTREACHED */ } - ifc.ifc_len = sizeof(inbuf); - ifc.ifc_buf = inbuf; - if (ioctl(fd, SIOCGIFCONF, (caddr_t)&ifc) < 0 || - ifc.ifc_len < sizeof(struct ifreq)) { - err(FATAL, "lookup_eaddr: SIOGIFCONF: %s", strerror(errno)); - /* NOTREACHED */ + while (1) { + ifc.ifc_len = inlen; + ifc.ifc_buf = inbuf = realloc(inbuf, inlen); + if (inbuf == NULL) { + close(fd); + err(FATAL, "init_all: malloc: %s", strerror(errno)); + } + if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0) { + (void) close(fd); + free(inbuf); + err(FATAL, "init_all: SIOCGIFCONF: %s", strerror(errno)); + /* NOTREACHED */ + } + if (ifc.ifc_len + sizeof(*ifr) < inlen) + break; + inlen *= 2; } + ifr = ifc.ifc_req; for (i = 0; i < ifc.ifc_len; i += len, ifr = (struct ifreq *)((caddr_t)ifr + len)) { @@ -638,10 +649,12 @@ lookup_eaddr(ifname, eaddr) fprintf(stderr, "%s: %x:%x:%x:%x:%x:%x\n", ifr->ifr_name, eaddr[0], eaddr[1], eaddr[2], eaddr[3], eaddr[4], eaddr[5]); + free(inbuf); return; } } + free(inbuf); err(FATAL, "lookup_eaddr: Never saw interface `%s'!", ifname); } /* |