/*
* Copyright (c) 2000 Markus Friedl. All rights reserved.
+ * Copyright (c) 2005 Damien Miller. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
*/
#include "includes.h"
-RCSID("$OpenBSD: misc.c,v 1.30 2005/04/09 04:32:54 djm Exp $");
+RCSID("$OpenBSD: misc.c,v 1.42 2006/01/31 10:19:02 djm Exp $");
+
+#ifdef SSH_TUN_OPENBSD
+#include <net/if.h>
+#endif
#include "misc.h"
#include "log.h"
return port;
}
+int
+a2tun(const char *s, int *remote)
+{
+ const char *errstr = NULL;
+ char *sp, *ep;
+ int tun;
+
+ if (remote != NULL) {
+ *remote = SSH_TUNID_ANY;
+ sp = xstrdup(s);
+ if ((ep = strchr(sp, ':')) == NULL) {
+ xfree(sp);
+ return (a2tun(s, NULL));
+ }
+ ep[0] = '\0'; ep++;
+ *remote = a2tun(ep, NULL);
+ tun = a2tun(sp, NULL);
+ xfree(sp);
+ return (*remote == SSH_TUNID_ERR ? *remote : tun);
+ }
+
+ if (strcasecmp(s, "any") == 0)
+ return (SSH_TUNID_ANY);
+
+ tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr);
+ if (errstr != NULL)
+ return (SSH_TUNID_ERR);
+
+ return (tun);
+}
+
#define SECONDS 1
#define MINUTES (SECONDS * 60)
#define HOURS (MINUTES * 60)
addargs(arglist *args, char *fmt, ...)
{
va_list ap;
- char buf[1024];
+ char *cp;
u_int nalloc;
+ int r;
va_start(ap, fmt);
- vsnprintf(buf, sizeof(buf), fmt, ap);
+ r = vasprintf(&cp, fmt, ap);
va_end(ap);
+ if (r == -1)
+ fatal("addargs: argument too long");
nalloc = args->nalloc;
if (args->list == NULL) {
args->list = xrealloc(args->list, nalloc * sizeof(char *));
args->nalloc = nalloc;
- args->list[args->num++] = xstrdup(buf);
+ args->list[args->num++] = cp;
args->list[args->num] = NULL;
}
+void
+replacearg(arglist *args, u_int which, char *fmt, ...)
+{
+ va_list ap;
+ char *cp;
+ int r;
+
+ va_start(ap, fmt);
+ r = vasprintf(&cp, fmt, ap);
+ va_end(ap);
+ if (r == -1)
+ fatal("replacearg: argument too long");
+
+ if (which >= args->num)
+ fatal("replacearg: tried to replace invalid arg %d >= %d",
+ which, args->num);
+ xfree(args->list[which]);
+ args->list[which] = cp;
+}
+
+void
+freeargs(arglist *args)
+{
+ u_int i;
+
+ if (args->list != NULL) {
+ for (i = 0; i < args->num; i++)
+ xfree(args->list[i]);
+ xfree(args->list);
+ args->nalloc = args->num = 0;
+ args->list = NULL;
+ }
+}
+
/*
* Expands tildes in the file name. Returns data allocated by xmalloc.
* Warning: this calls getpw*.
const char *path;
char user[128], ret[MAXPATHLEN];
struct passwd *pw;
- int len;
+ u_int len, slash;
if (*filename != '~')
return (xstrdup(filename));
path = strchr(filename, '/');
if (path != NULL && path > filename) { /* ~user/path */
- if (path - filename > sizeof(user) - 1)
+ slash = path - filename;
+ if (slash > sizeof(user) - 1)
fatal("tilde_expand_filename: ~username too long");
- memcpy(user, filename, path - filename);
- user[path - filename] = '\0';
+ memcpy(user, filename, slash);
+ user[slash] = '\0';
if ((pw = getpwnam(user)) == NULL)
fatal("tilde_expand_filename: No such user %s", user);
} else if ((pw = getpwuid(uid)) == NULL) /* ~/path */
return (xstrdup(ret));
}
+/*
+ * Expand a string with a set of %[char] escapes. A number of escapes may be
+ * specified as (char *escape_chars, char *replacement) pairs. The list must
+ * be terminated by a NULL escape_char. Returns replaced string in memory
+ * allocated by xmalloc.
+ */
+char *
+percent_expand(const char *string, ...)
+{
+#define EXPAND_MAX_KEYS 16
+ struct {
+ const char *key;
+ const char *repl;
+ } keys[EXPAND_MAX_KEYS];
+ u_int num_keys, i, j;
+ char buf[4096];
+ va_list ap;
+
+ /* Gather keys */
+ va_start(ap, string);
+ for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
+ keys[num_keys].key = va_arg(ap, char *);
+ if (keys[num_keys].key == NULL)
+ break;
+ keys[num_keys].repl = va_arg(ap, char *);
+ if (keys[num_keys].repl == NULL)
+ fatal("percent_expand: NULL replacement");
+ }
+ va_end(ap);
+
+ if (num_keys >= EXPAND_MAX_KEYS)
+ fatal("percent_expand: too many keys");
+
+ /* Expand string */
+ *buf = '\0';
+ for (i = 0; *string != '\0'; string++) {
+ if (*string != '%') {
+ append:
+ buf[i++] = *string;
+ if (i >= sizeof(buf))
+ fatal("percent_expand: string too long");
+ buf[i] = '\0';
+ continue;
+ }
+ string++;
+ if (*string == '%')
+ goto append;
+ for (j = 0; j < num_keys; j++) {
+ if (strchr(keys[j].key, *string) != NULL) {
+ i = strlcat(buf, keys[j].repl, sizeof(buf));
+ if (i >= sizeof(buf))
+ fatal("percent_expand: string too long");
+ break;
+ }
+ }
+ if (j >= num_keys)
+ fatal("percent_expand: unknown key %%%c", *string);
+ }
+ return (xstrdup(buf));
+#undef EXPAND_MAX_KEYS
+}
+
/*
* Read an entire line from a public key file into a static buffer, discarding
* lines that exceed the buffer size. Returns 0 on success, -1 on failure.
}
return -1;
}
+
+int
+tun_open(int tun, int mode)
+{
+#if defined(CUSTOM_SYS_TUN_OPEN)
+ return (sys_tun_open(tun, mode));
+#elif defined(SSH_TUN_OPENBSD)
+ struct ifreq ifr;
+ char name[100];
+ int fd = -1, sock;
+
+ /* Open the tunnel device */
+ if (tun <= SSH_TUNID_MAX) {
+ snprintf(name, sizeof(name), "/dev/tun%d", tun);
+ fd = open(name, O_RDWR);
+ } else if (tun == SSH_TUNID_ANY) {
+ for (tun = 100; tun >= 0; tun--) {
+ snprintf(name, sizeof(name), "/dev/tun%d", tun);
+ if ((fd = open(name, O_RDWR)) >= 0)
+ break;
+ }
+ } else {
+ debug("%s: invalid tunnel %u", __func__, tun);
+ return (-1);
+ }
+
+ if (fd < 0) {
+ debug("%s: %s open failed: %s", __func__, name, strerror(errno));
+ return (-1);
+ }
+
+ debug("%s: %s mode %d fd %d", __func__, name, mode, fd);
+
+ /* Set the tunnel device operation mode */
+ snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "tun%d", tun);
+ if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
+ goto failed;
+
+ if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1)
+ goto failed;
+
+ /* Set interface mode */
+ ifr.ifr_flags &= ~IFF_UP;
+ if (mode == SSH_TUNMODE_ETHERNET)
+ ifr.ifr_flags |= IFF_LINK0;
+ else
+ ifr.ifr_flags &= ~IFF_LINK0;
+ if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1)
+ goto failed;
+
+ /* Bring interface up */
+ ifr.ifr_flags |= IFF_UP;
+ if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1)
+ goto failed;
+
+ close(sock);
+ return (fd);
+
+ failed:
+ if (fd >= 0)
+ close(fd);
+ if (sock >= 0)
+ close(sock);
+ debug("%s: failed to set %s mode %d: %s", __func__, name,
+ mode, strerror(errno));
+ return (-1);
+#else
+ error("Tunnel interfaces are not supported on this platform");
+ return (-1);
+#endif
+}
+
+void
+sanitise_stdfd(void)
+{
+ int nullfd, dupfd;
+
+ if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
+ fprintf(stderr, "Couldn't open /dev/null: %s", strerror(errno));
+ exit(1);
+ }
+ while (++dupfd <= 2) {
+ /* Only clobber closed fds */
+ if (fcntl(dupfd, F_GETFL, 0) >= 0)
+ continue;
+ if (dup2(nullfd, dupfd) == -1) {
+ fprintf(stderr, "dup2: %s", strerror(errno));
+ exit(1);
+ }
+ }
+ if (nullfd > 2)
+ close(nullfd);
+}
+
+char *
+tohex(const u_char *d, u_int l)
+{
+ char b[3], *r;
+ u_int i, hl;
+
+ hl = l * 2 + 1;
+ r = xmalloc(hl);
+ *r = '\0';
+ for (i = 0; i < l; i++) {
+ snprintf(b, sizeof(b), "%02x", d[i]);
+ strlcat(r, b, hl);
+ }
+ return (r);
+}
+
andersk / openssh.git / blobdiff