diff options
Diffstat (limited to 'usr.sbin/lpr/common_source/net.c')
-rw-r--r-- | usr.sbin/lpr/common_source/net.c | 260 |
1 files changed, 260 insertions, 0 deletions
diff --git a/usr.sbin/lpr/common_source/net.c b/usr.sbin/lpr/common_source/net.c new file mode 100644 index 0000000..d5886f9 --- /dev/null +++ b/usr.sbin/lpr/common_source/net.c @@ -0,0 +1,260 @@ +/* + * Copyright (c) 1983, 1993 + * The Regents of the University of California. All rights reserved. + * (c) UNIX System Laboratories, Inc. + * All or some portions of this file are derived from material licensed + * to the University of California by American Telephone and Telegraph + * Co. or Unix System Laboratories, Inc. and are reproduced herein with + * the permission of UNIX System Laboratories, Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * From: @(#)common.c 8.5 (Berkeley) 4/28/95 + */ + +#ifndef lint +static const char rcsid[] = + "$Id$"; +#endif /* not lint */ + +#include <sys/param.h> +#include <sys/socket.h> +#include <sys/stat.h> +#include <sys/time.h> +#include <sys/uio.h> + +#include <netinet/in.h> +#include <arpa/inet.h> +#include <netdb.h> + +#include <dirent.h> /* required for lp.h, not used here */ +#include <errno.h> +#include <stdarg.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include "lp.h" +#include "lp.local.h" +#include "pathnames.h" + + /* host machine name */ +char host[MAXHOSTNAMELEN]; +char *from = host; /* client's machine name */ + +extern uid_t uid, euid; + +/* + * Create a TCP connection to host "rhost" at port "rport". + * If rport == 0, then use the printer service port. + * Most of this code comes from rcmd.c. + */ +int +getport(const struct printer *pp, const char *rhost, int rport) +{ + struct hostent *hp; + struct servent *sp; + struct sockaddr_in sin; + int s, timo = 1, lport = IPPORT_RESERVED - 1; + int err; + + /* + * Get the host address and port number to connect to. + */ + if (rhost == NULL) + fatal(pp, "no remote host to connect to"); + bzero((char *)&sin, sizeof(sin)); + sin.sin_len = sizeof sin; + sin.sin_family = AF_INET; + if (inet_aton(rhost, &sin.sin_addr) == 0) { + hp = gethostbyname2(rhost, AF_INET); + if (hp == NULL) + fatal(pp, "cannot resolve %s: %s", rhost, + hstrerror(h_errno)); + /* XXX - should deal with more addresses */ + sin.sin_addr = *(struct in_addr *)hp->h_addr_list[0]; + } + if (rport == 0) { + sp = getservbyname("printer", "tcp"); + if (sp == NULL) + fatal(pp, "printer/tcp: unknown service"); + sin.sin_port = sp->s_port; + } else + sin.sin_port = htons(rport); + + /* + * Try connecting to the server. + */ +retry: + seteuid(euid); + s = rresvport(&lport); + seteuid(uid); + if (s < 0) + return(-1); + if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) { + err = errno; + (void) close(s); + errno = err; + /* + * This used to decrement lport, but the current semantics + * of rresvport do not provide such a function (in fact, + * rresvport should guarantee that the chosen port will + * never result in an EADDRINUSE). + */ + if (errno == EADDRINUSE) + goto retry; + + if (errno == ECONNREFUSED && timo <= 16) { + sleep(timo); + timo *= 2; + goto retry; + } + return(-1); + } + return(s); +} + +/* + * Figure out whether the local machine is the same + * as the remote machine (RM) entry (if it exists). + * We do this by counting the intersection of our + * address list and theirs. This is better than the + * old method (comparing the canonical names), as it + * allows load-sharing between multiple print servers. + * The return value is an error message which must be + * free()d. + */ +char * +checkremote(struct printer *pp) +{ + char name[MAXHOSTNAMELEN]; + register struct hostent *hp; + char *err; + struct in_addr *localaddrs; + int i, j, nlocaladdrs, ncommonaddrs; + + pp->remote = 0; /* assume printer is local */ + if (pp->remote_host != NULL) { + /* get the addresses of the local host */ + gethostname(name, sizeof(name)); + name[sizeof(name) - 1] = '\0'; + hp = gethostbyname2(name, AF_INET); + if (hp == (struct hostent *) NULL) { + asprintf(&err, "unable to get official name " + "for local machine %s: %s", + name, hstrerror(h_errno)); + return err; + } + for (i = 0; hp->h_addr_list[i]; i++) + ; + nlocaladdrs = i; + localaddrs = malloc(i * sizeof(struct in_addr)); + if (localaddrs == 0) { + asprintf(&err, "malloc %lu bytes failed", + (u_long)i * sizeof(struct in_addr)); + return err; + } + for (i = 0; hp->h_addr_list[i]; i++) + localaddrs[i] = *(struct in_addr *)hp->h_addr_list[i]; + + /* get the official name of RM */ + hp = gethostbyname2(pp->remote_host, AF_INET); + if (hp == (struct hostent *) NULL) { + asprintf(&err, "unable to get address list for " + "remote machine %s: %s", + pp->remote_host, hstrerror(h_errno)); + free(localaddrs); + return err; + } + + ncommonaddrs = 0; + for (i = 0; i < nlocaladdrs; i++) { + for (j = 0; hp->h_addr_list[j]; j++) { + char *them = hp->h_addr_list[j]; + if (localaddrs[i].s_addr == + (*(struct in_addr *)them).s_addr) + ncommonaddrs++; + } + } + + /* + * if the two hosts do not share at least one IP address + * then the printer must be remote. + */ + if (ncommonaddrs == 0) + pp->remote = 1; + free(localaddrs); + } + return NULL; +} + +/* + * This isn't really network-related, but it's used here to write + * multi-part strings onto sockets without using stdio. Return + * values are as for writev(2). + */ +ssize_t +writel(int s, ...) +{ + va_list ap; + int i, n; + const char *cp; +#define NIOV 12 + struct iovec iov[NIOV], *iovp = iov; + ssize_t retval; + + /* first count them */ + va_start(ap, s); + n = 0; + do { + cp = va_arg(ap, char *); + n++; + } while (cp); + va_end(ap); + n--; /* correct for count of trailing null */ + + if (n > NIOV) { + iovp = malloc(n * sizeof *iovp); + if (iovp == 0) + return -1; + } + + /* now make up iovec and send */ + va_start(ap, s); + for (i = 0; i < n; i++) { + iovp[i].iov_base = va_arg(ap, char *); + iovp[i].iov_len = strlen(iovp[i].iov_base); + } + va_end(ap); + retval = writev(s, iovp, n); + if (iovp != iov) + free(iovp); + return retval; +} |