diff options
author | des <des@FreeBSD.org> | 2006-03-22 19:46:12 +0000 |
---|---|---|
committer | des <des@FreeBSD.org> | 2006-03-22 19:46:12 +0000 |
commit | 448503722a8c8934d8520302b7551e95de730b06 (patch) | |
tree | 42b3633dec62ddc0b702c6e83df5d64683b1c6c3 /crypto/openssh/misc.c | |
parent | 755a16fa864cacbbd9fbefc822011b6741351d8d (diff) | |
download | FreeBSD-src-448503722a8c8934d8520302b7551e95de730b06.zip FreeBSD-src-448503722a8c8934d8520302b7551e95de730b06.tar.gz |
Vendor import of OpenSSH 4.3p1.
Diffstat (limited to 'crypto/openssh/misc.c')
-rw-r--r-- | crypto/openssh/misc.c | 173 |
1 files changed, 169 insertions, 4 deletions
diff --git a/crypto/openssh/misc.c b/crypto/openssh/misc.c index 2dd8ae6..29e9288 100644 --- a/crypto/openssh/misc.c +++ b/crypto/openssh/misc.c @@ -24,7 +24,11 @@ */ #include "includes.h" -RCSID("$OpenBSD: misc.c,v 1.34 2005/07/08 09:26:18 dtucker 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" @@ -194,6 +198,37 @@ a2port(const char *s) 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) @@ -356,12 +391,15 @@ void 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) { @@ -372,10 +410,44 @@ addargs(arglist *args, char *fmt, ...) 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*. @@ -507,6 +579,99 @@ read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz, 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) { |