diff options
Diffstat (limited to 'inet/rcmd.c')
| -rw-r--r-- | inet/rcmd.c | 76 |
1 files changed, 61 insertions, 15 deletions
diff --git a/inet/rcmd.c b/inet/rcmd.c index 3fc8adc742..2631523a22 100644 --- a/inet/rcmd.c +++ b/inet/rcmd.c @@ -42,6 +42,7 @@ static char sccsid[] = "@(#)rcmd.c 8.3 (Berkeley) 3/26/94"; #include <netinet/in.h> #include <arpa/inet.h> +#include <alloca.h> #include <signal.h> #include <fcntl.h> #include <netdb.h> @@ -63,20 +64,35 @@ rcmd(ahost, rport, locuser, remuser, cmd, fd2p) const char *locuser, *remuser, *cmd; int *fd2p; { - struct hostent *hp; + struct hostent hostbuf, *hp; + size_t hstbuflen; + char *tmphstbuf; struct sockaddr_in sin, from; fd_set reads; int32_t oldmask; pid_t pid; int s, lport, timo; char c; + int herr; pid = getpid(); - hp = gethostbyname(*ahost); - if (hp == NULL) { - herror(*ahost); - return (-1); - } + + hstbuflen = 1024; + tmphstbuf = __alloca (hstbuflen); + while (__gethostbyname_r (*ahost, &hostbuf, tmphstbuf, hstbuflen, + &hp, &herr) < 0) + if (herr != NETDB_INTERNAL || errno != ERANGE) + { + herror(*ahost); + return -1; + } + else + { + /* Enlarge the buffer. */ + hstbuflen *= 2; + tmphstbuf = __alloca (hstbuflen); + } + *ahost = hp->h_name; oldmask = sigblock(sigmask(SIGURG)); for (timo = 1, lport = IPPORT_RESERVED - 1;;) { @@ -244,12 +260,27 @@ ruserok(rhost, superuser, ruser, luser) const char *rhost, *ruser, *luser; int superuser; { - struct hostent *hp; + struct hostent hostbuf, *hp; + size_t buflen; + char *buffer; u_int32_t addr; char **ap; + int herr; + + buflen = 1024; + buffer = __alloca (buflen); + + while (__gethostbyname_r (rhost, &hostbuf, buffer, buflen, &hp, &herr) + < 0) + if (herr != NETDB_INTERNAL || errno != ERANGE) + return -1; + else + { + /* Enlarge the buffer. */ + buflen *= 2; + buffer = __alloca (buflen); + } - if ((hp = gethostbyname(rhost)) == NULL) - return (-1); for (ap = hp->h_addr_list; *ap; ++ap) { bcopy(*ap, &addr, sizeof(addr)); if (iruserok(addr, superuser, ruser, luser) == 0) @@ -275,7 +306,7 @@ iruserok(raddr, superuser, ruser, luser) { register char *cp; struct stat sbuf; - struct passwd *pwd; + struct passwd pwdbuf, *pwd; FILE *hostf; uid_t uid; int first; @@ -293,10 +324,12 @@ again: if (first == 1 && (__check_rhosts_file || superuser)) { char *pbuf; size_t dirlen; + size_t buflen = __sysconf (_SC_GETPW_R_SIZE_MAX); + char buffer = __alloca (buflen); first = 0; - if ((pwd = getpwnam(luser)) == NULL) - return (-1); + if (getpwnam_r (luser, &pwdbuf, buffer, buflen, &pwd) < 0) + return -1; dirlen = strlen (pwd->pw_dir); pbuf = alloca (dirlen + sizeof "/.rhosts"); @@ -395,17 +428,30 @@ __icheckhost(raddr, lhost) u_int32_t raddr; register char *lhost; { - register struct hostent *hp; + register struct hostent hostbuf, *hp; + size_t buflen; + char *buffer; register u_int32_t laddr; register char **pp; + int herr; /* Try for raw ip address first. */ if (isdigit(*lhost) && (int32_t)(laddr = inet_addr(lhost)) != -1) return (raddr == laddr); /* Better be a hostname. */ - if ((hp = gethostbyname(lhost)) == NULL) - return (0); + buflen = 1024; + buffer = __alloca (buflen); + while (__gethostbyname_r (lhost, &hostbuf, buffer, buflen, &hp, &herr) + < 0) + if (herr != NETDB_INTERNAL || errno != ERANGE) + return 0; + else + { + /* Enlarge the buffer. */ + buflen *= 2; + buflen = __alloca (buflen); + } /* Spin through ip addresses. */ for (pp = hp->h_addr_list; *pp; ++pp) |