mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-15 10:17:20 +00:00
Massive cleanup of the code removing global variables to
pass function arguments and results. Hopefully no functional changes except fixing a couple of bugs which could cause endless loops if an ioctl() on an interface would fail.
This commit is contained in:
Luigi Rizzo
parent
8b29c1a01e
commit
68839124b6
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=128192
@ -85,27 +85,26 @@ __FBSDID("$FreeBSD$");
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#include <unistd.h>
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typedef void (action_fn)(struct sockaddr_dl *sdl,
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struct sockaddr_inarp *s_in, struct rt_msghdr *rtm);
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struct sockaddr_inarp *s_in, struct rt_msghdr *rtm);
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static int search(u_long addr, action_fn *action);
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static action_fn print_entry;
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static action_fn nuke_entry;
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static int delete(char *host, char *info);
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static int delete(char *host, int do_proxy);
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static void usage(void);
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static int set(int argc, char **argv);
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static int get(char *host);
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static void get(char *host);
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static int file(char *name);
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static int my_ether_aton(char *a, struct ether_addr *n);
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static struct rt_msghdr *rtmsg(int cmd);
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static struct rt_msghdr *rtmsg(int cmd,
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struct sockaddr_inarp *dst, struct sockaddr_dl *sdl);
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static int get_ether_addr(u_int32_t ipaddr, struct ether_addr *hwaddr);
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static int nflag; /* no reverse dns lookups */
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static char *rifname;
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static struct sockaddr_inarp blank_sin, sin_m;
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static struct sockaddr_dl sdl_m;
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static int expire_time, flags, doing_proxy, proxy_only;
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/* which function we're supposed to do */
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#define F_GET 1
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#define F_SET 2
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@ -152,10 +151,6 @@ main(int argc, char *argv[])
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argc -= optind;
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argv += optind;
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bzero(&blank_sin, sizeof(blank_sin));
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blank_sin.sin_len = sizeof(blank_sin);
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blank_sin.sin_family = AF_INET;
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if (!func)
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func = F_GET;
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if (rifname) {
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@ -185,7 +180,7 @@ main(int argc, char *argv[])
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if (argc < 2 || argc > 6)
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usage();
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if (func == F_REPLACE)
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(void) delete(argv[0], NULL);
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delete(argv[0], 0);
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rtn = set(argc, argv) ? 1 : 0;
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break;
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case F_DELETE:
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@ -194,9 +189,13 @@ main(int argc, char *argv[])
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usage();
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search(0, nuke_entry);
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} else {
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if (argc < 1 || argc > 2)
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if (argc == 2 && strncmp(argv[1], "pub", 3) == 0)
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ch = SIN_PROXY;
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else if (argc == 1)
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ch = 0;
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else
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usage();
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rtn = delete(argv[0], argv[1]);
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rtn = delete(argv[0], ch);
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}
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break;
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case F_FILESET:
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@ -248,17 +247,63 @@ file(char *name)
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}
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/*
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* Set an individual arp entry
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* Given a hostname, fills up a (static) struct sockaddr_inarp with
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* the address of the host and returns a pointer to the
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* structure.
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*/
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int
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set(int argc, char **argv)
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static struct sockaddr_inarp *
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getaddr(char *host)
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{
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struct hostent *hp;
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struct sockaddr_inarp *addr = &sin_m;
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static struct sockaddr_inarp reply;
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bzero(&reply, sizeof(reply));
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reply.sin_len = sizeof(reply);
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reply.sin_family = AF_INET;
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reply.sin_addr.s_addr = inet_addr(host);
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if (reply.sin_addr.s_addr == INADDR_NONE) {
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if (!(hp = gethostbyname(host))) {
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warnx("%s: %s", host, hstrerror(h_errno));
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return NULL;
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}
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bcopy((char *)hp->h_addr, (char *)&reply.sin_addr,
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sizeof reply.sin_addr);
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}
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return &reply;
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}
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/*
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* returns true if the type is a valid one for ARP
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*/
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static int
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valid_type(int type)
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{
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switch (type) {
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default:
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return 0;
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case IFT_ETHER:
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case IFT_FDDI:
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case IFT_ISO88023:
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case IFT_ISO88024:
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case IFT_ISO88025:
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case IFT_L2VLAN:
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return 1;
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}
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}
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/*
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* Set an individual arp entry
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*/
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static int
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set(int argc, char **argv)
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{
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struct sockaddr_inarp *addr;
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struct sockaddr_inarp *dst; /* what are we looking for */
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struct sockaddr_dl *sdl;
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struct rt_msghdr *rtm;
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struct ether_addr *ea;
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char *host = argv[0], *eaddr = argv[1];
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struct sockaddr_dl sdl_m;
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argc -= 2;
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argv += 2;
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@ -267,16 +312,9 @@ set(int argc, char **argv)
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sdl_m.sdl_len = sizeof(sdl_m);
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sdl_m.sdl_family = AF_LINK;
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sin_m = blank_sin;
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addr->sin_addr.s_addr = inet_addr(host);
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if (addr->sin_addr.s_addr == INADDR_NONE) {
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if (!(hp = gethostbyname(host))) {
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warnx("%s: %s", host, hstrerror(h_errno));
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return (1);
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}
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bcopy((char *)hp->h_addr, (char *)&addr->sin_addr,
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sizeof addr->sin_addr);
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}
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dst = getaddr(host);
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if (dst == NULL)
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return (1);
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doing_proxy = flags = proxy_only = expire_time = 0;
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while (argc-- > 0) {
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if (strncmp(argv[0], "temp", 4) == 0) {
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@ -289,10 +327,11 @@ set(int argc, char **argv)
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doing_proxy = 1;
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if (argc && strncmp(argv[1], "only", 3) == 0) {
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proxy_only = 1;
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sin_m.sin_other = SIN_PROXY;
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dst->sin_other = SIN_PROXY;
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argc--; argv++;
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}
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} else if (strncmp(argv[0], "trail", 5) == 0) {
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/* XXX deprecated and undocumented feature */
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printf("%s: Sending trailers is no longer supported\n",
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host);
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}
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@ -300,149 +339,113 @@ set(int argc, char **argv)
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}
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ea = (struct ether_addr *)LLADDR(&sdl_m);
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if (doing_proxy && !strcmp(eaddr, "auto")) {
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if (!get_ether_addr(addr->sin_addr.s_addr, ea)) {
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if (!get_ether_addr(dst->sin_addr.s_addr, ea)) {
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printf("no interface found for %s\n",
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inet_ntoa(addr->sin_addr));
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inet_ntoa(dst->sin_addr));
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return (1);
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}
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sdl_m.sdl_alen = ETHER_ADDR_LEN;
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} else {
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if (my_ether_aton(eaddr, ea) == 0)
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struct ether_addr *ea1 = ether_aton(eaddr);
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if (ea1 == NULL)
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warnx("invalid Ethernet address '%s'", eaddr);
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else {
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*ea = *ea1;
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sdl_m.sdl_alen = ETHER_ADDR_LEN;
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}
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}
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tryagain:
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rtm = rtmsg(RTM_GET);
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if (rtm == NULL) {
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warn("%s", host);
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return (1);
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}
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addr = (struct sockaddr_inarp *)(rtm + 1);
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sdl = (struct sockaddr_dl *)(SA_SIZE(addr) + (char *)addr);
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if (addr->sin_addr.s_addr == sin_m.sin_addr.s_addr) {
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for (;;) { /* try at most twice */
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rtm = rtmsg(RTM_GET, dst, &sdl_m);
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if (rtm == NULL) {
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warn("%s", host);
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return (1);
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}
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addr = (struct sockaddr_inarp *)(rtm + 1);
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sdl = (struct sockaddr_dl *)(SA_SIZE(addr) + (char *)addr);
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if (addr->sin_addr.s_addr != dst->sin_addr.s_addr)
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break;
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if (sdl->sdl_family == AF_LINK &&
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(rtm->rtm_flags & RTF_LLINFO) &&
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!(rtm->rtm_flags & RTF_GATEWAY))
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switch (sdl->sdl_type) {
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case IFT_ETHER:
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case IFT_FDDI:
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case IFT_ISO88023:
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case IFT_ISO88024:
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case IFT_ISO88025:
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case IFT_L2VLAN:
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goto overwrite;
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}
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!(rtm->rtm_flags & RTF_GATEWAY) &&
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valid_type(sdl->sdl_type) )
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break;
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if (doing_proxy == 0) {
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printf("set: can only proxy for %s\n", host);
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return (1);
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}
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if (sin_m.sin_other & SIN_PROXY) {
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if (dst->sin_other & SIN_PROXY) {
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printf("set: proxy entry exists for non 802 device\n");
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return(1);
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}
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sin_m.sin_other = SIN_PROXY;
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dst->sin_other = SIN_PROXY;
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proxy_only = 1;
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goto tryagain;
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}
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overwrite:
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if (sdl->sdl_family != AF_LINK) {
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printf("cannot intuit interface index and type for %s\n", host);
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return (1);
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}
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sdl_m.sdl_type = sdl->sdl_type;
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sdl_m.sdl_index = sdl->sdl_index;
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return (rtmsg(RTM_ADD) != NULL);
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return (rtmsg(RTM_ADD, dst, &sdl_m) != NULL);
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}
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/*
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* Display an individual arp entry
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*/
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static int
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static void
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get(char *host)
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{
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struct hostent *hp;
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struct sockaddr_inarp *addr = &sin_m;
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struct sockaddr_inarp *addr;
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sin_m = blank_sin;
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addr->sin_addr.s_addr = inet_addr(host);
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if (addr->sin_addr.s_addr == INADDR_NONE) {
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if (!(hp = gethostbyname(host)))
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errx(1, "%s: %s", host, hstrerror(h_errno));
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bcopy((char *)hp->h_addr, (char *)&addr->sin_addr,
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sizeof addr->sin_addr);
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}
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addr = getaddr(host);
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if (addr == NULL)
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exit(1);
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if (0 == search(addr->sin_addr.s_addr, print_entry)) {
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printf("%s (%s) -- no entry",
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host, inet_ntoa(addr->sin_addr));
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if (rifname)
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printf(" on %s", rifname);
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printf("\n");
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return(1);
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}
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return(0);
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}
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/*
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* Delete an arp entry
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*/
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static int
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delete(char *host, char *info)
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delete(char *host, int do_proxy)
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{
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struct hostent *hp;
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struct sockaddr_inarp *addr = &sin_m;
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struct sockaddr_inarp *addr, *dst;
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struct rt_msghdr *rtm;
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struct sockaddr_dl *sdl;
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sin_m = blank_sin;
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if (info) {
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if (strncmp(info, "pub", 3) == 0)
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sin_m.sin_other = SIN_PROXY;
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else
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usage();
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}
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addr->sin_addr.s_addr = inet_addr(host);
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if (addr->sin_addr.s_addr == INADDR_NONE) {
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if (!(hp = gethostbyname(host))) {
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warnx("%s: %s", host, hstrerror(h_errno));
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dst = getaddr(host);
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if (dst == NULL)
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return 1;
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dst->sin_other = do_proxy;
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for (;;) { /* try twice */
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rtm = rtmsg(RTM_GET, dst, NULL);
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if (rtm == NULL) {
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warn("%s", host);
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return (1);
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}
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bcopy((char *)hp->h_addr, (char *)&addr->sin_addr,
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sizeof addr->sin_addr);
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}
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tryagain:
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rtm = rtmsg(RTM_GET);
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if (rtm == NULL) {
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warn("%s", host);
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return (1);
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}
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addr = (struct sockaddr_inarp *)(rtm + 1);
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sdl = (struct sockaddr_dl *)(SA_SIZE(addr) + (char *)addr);
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if (addr->sin_addr.s_addr == sin_m.sin_addr.s_addr) {
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if (sdl->sdl_family == AF_LINK &&
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addr = (struct sockaddr_inarp *)(rtm + 1);
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sdl = (struct sockaddr_dl *)(SA_SIZE(addr) + (char *)addr);
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if (addr->sin_addr.s_addr == dst->sin_addr.s_addr &&
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sdl->sdl_family == AF_LINK &&
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(rtm->rtm_flags & RTF_LLINFO) &&
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!(rtm->rtm_flags & RTF_GATEWAY))
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switch (sdl->sdl_type) {
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case IFT_ETHER:
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case IFT_FDDI:
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case IFT_ISO88023:
|
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case IFT_ISO88024:
|
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case IFT_ISO88025:
|
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case IFT_L2VLAN:
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goto delete;
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}
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!(rtm->rtm_flags & RTF_GATEWAY) &&
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valid_type(sdl->sdl_type) )
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break; /* found it */
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if (dst->sin_other & SIN_PROXY) {
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fprintf(stderr, "delete: cannot locate %s\n",host);
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return (1);
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}
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dst->sin_other = SIN_PROXY;
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}
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if (sin_m.sin_other & SIN_PROXY) {
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fprintf(stderr, "delete: can't locate %s\n",host);
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return (1);
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} else {
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sin_m.sin_other = SIN_PROXY;
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goto tryagain;
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}
|
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delete:
|
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if (sdl->sdl_family != AF_LINK) {
|
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printf("cannot locate %s\n", host);
|
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return (1);
|
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}
|
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if (rtmsg(RTM_DELETE) != NULL) {
|
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if (rtmsg(RTM_DELETE, dst, NULL) != NULL) {
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printf("%s (%s) deleted\n", host, inet_ntoa(addr->sin_addr));
|
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return (0);
|
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}
|
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@ -472,7 +475,7 @@ search(u_long addr, action_fn *action)
|
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mib[5] = RTF_LLINFO;
|
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if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
|
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err(1, "route-sysctl-estimate");
|
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if (needed == 0)
|
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if (needed == 0) /* empty table */
|
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return 0;
|
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if ((buf = malloc(needed)) == NULL)
|
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err(1, "malloc");
|
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@ -583,20 +586,7 @@ nuke_entry(struct sockaddr_dl *sdl __unused,
|
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char ip[20];
|
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|
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snprintf(ip, sizeof(ip), "%s", inet_ntoa(addr->sin_addr));
|
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delete(ip, NULL);
|
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}
|
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|
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static int
|
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my_ether_aton(char *a, struct ether_addr *n)
|
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{
|
||||
struct ether_addr *ea;
|
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|
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if ((ea = ether_aton(a)) == NULL) {
|
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warnx("invalid Ethernet address '%s'", a);
|
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return (1);
|
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}
|
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*n = *ea;
|
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return (0);
|
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delete(ip, 0);
|
||||
}
|
||||
|
||||
static void
|
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@ -614,7 +604,7 @@ usage(void)
|
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}
|
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|
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static struct rt_msghdr *
|
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rtmsg(int cmd)
|
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rtmsg(int cmd, struct sockaddr_inarp *dst, struct sockaddr_dl *sdl)
|
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{
|
||||
static int seq;
|
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int rlen;
|
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@ -642,6 +632,10 @@ rtmsg(int cmd)
|
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so_mask.sin_addr.s_addr = 0xffffffff;
|
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|
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errno = 0;
|
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/*
|
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* XXX RTM_DELETE relies on a previous RTM_GET to fill the buffer
|
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* appropriately.
|
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*/
|
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if (cmd == RTM_DELETE)
|
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goto doit;
|
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bzero((char *)&m_rtmsg, sizeof(m_rtmsg));
|
||||
@ -656,10 +650,10 @@ rtmsg(int cmd)
|
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rtm->rtm_rmx.rmx_expire = expire_time;
|
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rtm->rtm_inits = RTV_EXPIRE;
|
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rtm->rtm_flags |= (RTF_HOST | RTF_STATIC);
|
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sin_m.sin_other = 0;
|
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dst->sin_other = 0;
|
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if (doing_proxy) {
|
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if (proxy_only)
|
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sin_m.sin_other = SIN_PROXY;
|
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dst->sin_other = SIN_PROXY;
|
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else {
|
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rtm->rtm_addrs |= RTA_NETMASK;
|
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rtm->rtm_flags &= ~RTF_HOST;
|
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@ -670,12 +664,12 @@ rtmsg(int cmd)
|
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rtm->rtm_addrs |= RTA_DST;
|
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}
|
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#define NEXTADDR(w, s) \
|
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if (rtm->rtm_addrs & (w)) { \
|
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bcopy((char *)&s, cp, sizeof(s)); cp += SA_SIZE(&s);}
|
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if (s && rtm->rtm_addrs & (w)) { \
|
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bcopy(s, cp, sizeof(*s)); cp += SA_SIZE(s);}
|
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|
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NEXTADDR(RTA_DST, sin_m);
|
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NEXTADDR(RTA_GATEWAY, sdl_m);
|
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NEXTADDR(RTA_NETMASK, so_mask);
|
||||
NEXTADDR(RTA_DST, dst);
|
||||
NEXTADDR(RTA_GATEWAY, sdl);
|
||||
NEXTADDR(RTA_NETMASK, &so_mask);
|
||||
|
||||
rtm->rtm_msglen = cp - (char *)&m_rtmsg;
|
||||
doit:
|
||||
@ -706,12 +700,13 @@ static int
|
||||
get_ether_addr(u_int32_t ipaddr, struct ether_addr *hwaddr)
|
||||
{
|
||||
struct ifreq *ifr, *ifend, *ifp;
|
||||
u_int32_t ina, mask;
|
||||
uint32_t ina, mask;
|
||||
struct sockaddr_dl *dla;
|
||||
struct ifreq ifreq;
|
||||
struct ifconf ifc;
|
||||
struct ifreq ifs[MAX_IFS];
|
||||
int sock;
|
||||
int retval = 0;
|
||||
|
||||
sock = socket(AF_INET, SOCK_DGRAM, 0);
|
||||
if (sock < 0)
|
||||
@ -721,75 +716,73 @@ get_ether_addr(u_int32_t ipaddr, struct ether_addr *hwaddr)
|
||||
ifc.ifc_req = ifs;
|
||||
if (ioctl(sock, SIOCGIFCONF, &ifc) < 0) {
|
||||
warnx("ioctl(SIOCGIFCONF)");
|
||||
close(sock);
|
||||
return 0;
|
||||
goto done;
|
||||
}
|
||||
|
||||
#define NEXTIFR(i) \
|
||||
((struct ifreq *)((char *)&(i)->ifr_addr \
|
||||
+ MAX((i)->ifr_addr.sa_len, sizeof((i)->ifr_addr))) )
|
||||
|
||||
/*
|
||||
* Scan through looking for an interface with an Internet
|
||||
* address on the same subnet as `ipaddr'.
|
||||
*/
|
||||
ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
|
||||
for (ifr = ifc.ifc_req; ifr < ifend; ) {
|
||||
if (ifr->ifr_addr.sa_family == AF_INET) {
|
||||
ina = ((struct sockaddr_in *)
|
||||
&ifr->ifr_addr)->sin_addr.s_addr;
|
||||
strncpy(ifreq.ifr_name, ifr->ifr_name,
|
||||
sizeof(ifreq.ifr_name));
|
||||
/*
|
||||
* Check that the interface is up,
|
||||
* and not point-to-point or loopback.
|
||||
*/
|
||||
if (ioctl(sock, SIOCGIFFLAGS, &ifreq) < 0)
|
||||
continue;
|
||||
if ((ifreq.ifr_flags &
|
||||
(IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|
|
||||
IFF_LOOPBACK|IFF_NOARP))
|
||||
!= (IFF_UP|IFF_BROADCAST))
|
||||
goto nextif;
|
||||
/*
|
||||
* Get its netmask and check that it's on
|
||||
* the right subnet.
|
||||
*/
|
||||
if (ioctl(sock, SIOCGIFNETMASK, &ifreq) < 0)
|
||||
continue;
|
||||
mask = ((struct sockaddr_in *)
|
||||
&ifreq.ifr_addr)->sin_addr.s_addr;
|
||||
if ((ipaddr & mask) != (ina & mask))
|
||||
goto nextif;
|
||||
break;
|
||||
}
|
||||
nextif:
|
||||
ifr = (struct ifreq *) ((char *)&ifr->ifr_addr
|
||||
+ MAX(ifr->ifr_addr.sa_len, sizeof(ifr->ifr_addr)));
|
||||
* Scan through looking for an interface with an Internet
|
||||
* address on the same subnet as `ipaddr'.
|
||||
*/
|
||||
ifend = (struct ifreq *)(ifc.ifc_buf + ifc.ifc_len);
|
||||
for (ifr = ifc.ifc_req; ifr < ifend; ifr = NEXTIFR(ifr) ) {
|
||||
if (ifr->ifr_addr.sa_family != AF_INET)
|
||||
continue;
|
||||
/* XXX can't we use *ifr instead of ifreq ? */
|
||||
strncpy(ifreq.ifr_name, ifr->ifr_name,
|
||||
sizeof(ifreq.ifr_name));
|
||||
/*
|
||||
* Check that the interface is up,
|
||||
* and not point-to-point or loopback.
|
||||
*/
|
||||
if (ioctl(sock, SIOCGIFFLAGS, &ifreq) < 0)
|
||||
continue;
|
||||
if ((ifreq.ifr_flags &
|
||||
(IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|
|
||||
IFF_LOOPBACK|IFF_NOARP))
|
||||
!= (IFF_UP|IFF_BROADCAST))
|
||||
continue;
|
||||
/*
|
||||
* Get its netmask and check that it's on
|
||||
* the right subnet.
|
||||
*/
|
||||
if (ioctl(sock, SIOCGIFNETMASK, &ifreq) < 0)
|
||||
continue;
|
||||
mask = ((struct sockaddr_in *)
|
||||
&ifreq.ifr_addr)->sin_addr.s_addr;
|
||||
ina = ((struct sockaddr_in *)
|
||||
&ifr->ifr_addr)->sin_addr.s_addr;
|
||||
if ((ipaddr & mask) == (ina & mask))
|
||||
break; /* ok, we got it! */
|
||||
}
|
||||
|
||||
if (ifr >= ifend) {
|
||||
close(sock);
|
||||
return 0;
|
||||
}
|
||||
if (ifr >= ifend)
|
||||
goto done;
|
||||
|
||||
/*
|
||||
* Now scan through again looking for a link-level address
|
||||
* for this interface.
|
||||
*/
|
||||
* Now scan through again looking for a link-level address
|
||||
* for this interface.
|
||||
*/
|
||||
ifp = ifr;
|
||||
for (ifr = ifc.ifc_req; ifr < ifend; ) {
|
||||
if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0
|
||||
&& ifr->ifr_addr.sa_family == AF_LINK) {
|
||||
/*
|
||||
* Found the link-level address - copy it out
|
||||
*/
|
||||
dla = (struct sockaddr_dl *) &ifr->ifr_addr;
|
||||
memcpy(hwaddr, LLADDR(dla), dla->sdl_alen);
|
||||
close (sock);
|
||||
printf("using interface %s for proxy with address ",
|
||||
ifp->ifr_name);
|
||||
printf("%s\n", ether_ntoa(hwaddr));
|
||||
return dla->sdl_alen;
|
||||
}
|
||||
ifr = (struct ifreq *) ((char *)&ifr->ifr_addr
|
||||
+ MAX(ifr->ifr_addr.sa_len, sizeof(ifr->ifr_addr)));
|
||||
}
|
||||
return 0;
|
||||
for (ifr = ifc.ifc_req; ifr < ifend; ifr = NEXTIFR(ifr))
|
||||
if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0 &&
|
||||
ifr->ifr_addr.sa_family == AF_LINK)
|
||||
break;
|
||||
if (ifr >= ifend)
|
||||
goto done;
|
||||
/*
|
||||
* Found the link-level address - copy it out
|
||||
*/
|
||||
dla = (struct sockaddr_dl *) &ifr->ifr_addr;
|
||||
memcpy(hwaddr, LLADDR(dla), dla->sdl_alen);
|
||||
printf("using interface %s for proxy with address ",
|
||||
ifp->ifr_name);
|
||||
printf("%s\n", ether_ntoa(hwaddr));
|
||||
retval = dla->sdl_alen;
|
||||
done:
|
||||
close(sock);
|
||||
return retval;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user