only fix for linux

Author: Afshin Paydar

pcap-bpf.c

@@ -41,15 +41,6 @@
 #ifdef HAVE_SYS_IOCCOM_H
 #include <sys/ioccom.h>
 #endif
-
-/*
- * On some platforms, <sys/sockio.h> is needed for SIOCGIF* macros.
- * Include it conditionally based on what the build system detects.
- */
-#if defined(HAVE_SOLARIS) || defined(__HAIKU__)
-#include <sys/sockio.h>
-#endif
-
 #include <sys/utsname.h>
 
 #if defined(__FreeBSD__) && defined(SIOCIFCREATE2)
@@ -635,58 +626,6 @@ bpf_open(char *errbuf)
 #define BPF_BIND_SUCCEEDED	0
 #define BPF_BIND_BUFFER_TOO_BIG	1
 
-/*
- * Check if an interface exists without requiring special privileges.
- * Returns 0 if the interface exists, PCAP_ERROR_NO_SUCH_DEVICE if it doesn't,
- * or another negative error code on other failures.
- */
-static int
-check_interface_exists(const char *name, char *errbuf)
-{
-#ifndef _WIN32
-	int fd;
-	struct ifreq ifr;
-
-	if (strlen(name) >= sizeof(ifr.ifr_name)) {
-		/* The name is too long, so it can't possibly exist. */
-		errbuf[0] = '\0';
-		return PCAP_ERROR_NO_SUCH_DEVICE;
-	}
-
-	fd = socket(AF_INET, SOCK_DGRAM, 0);
-	if (fd < 0) {
-		pcapint_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
-		    errno, "socket");
-		return PCAP_ERROR;
-	}
-
-	memset(&ifr, 0, sizeof(ifr));
-	pcapint_strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
-
-	if (ioctl(fd, SIOCGIFFLAGS, &ifr) < 0) {
-		int save_errno = errno;
-		close(fd);
-
-		if (save_errno == ENXIO || save_errno == ENODEV) {
-			/* Interface doesn't exist */
-			errbuf[0] = '\0';
-			return PCAP_ERROR_NO_SUCH_DEVICE;
-		} else {
-			/* Some other error occurred */
-			pcapint_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
-			    save_errno, "SIOCGIFFLAGS on %s", name);
-			return PCAP_ERROR;
-		}
-	}
-
-	close(fd);
-	return 0;
-#else
-	/* On Windows, skip the check for now */
-	return 0;
-#endif
-}
-
 static int
 bpf_bind(int fd, const char *name, char *errbuf)
 {
@@ -1984,16 +1923,6 @@ pcap_activate_bpf(pcap_t *p)
 	int flags = MAP_ANON;
 #endif
 
-	/*
-	 * Check if the interface exists before trying to open BPF device.
-	 * This avoids reporting permission errors when the real issue is
-	 * that the interface doesn't exist.
-	 */
-	status = check_interface_exists(p->opt.device, p->errbuf);
-	if (status != 0) {
-		goto bad;
-	}
-
 	fd = bpf_open(p->errbuf);
 	if (fd < 0) {
 		status = fd;