xref: /illumos-gate/usr/src/cmd/lp/model/netpr/tcp_misc.c (revision 012e6ce759c490003aed29439cc47d3d73a99ad3)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <libintl.h>
30 #include <signal.h>
31 #include <errno.h>
32 #include <string.h>
33 #include <strings.h>
34 #include <syslog.h>
35 #include <unistd.h>
36 #include <sys/types.h>
37 #include <fcntl.h>
38 #include <sys/socket.h>
39 #include <netinet/in.h>
40 #include <arpa/inet.h>
41 #include <netdb.h>
42 #include "netpr.h"
43 #include "netdebug.h"
44 
45 #define	MAX_NLPS	60	/* Max no. loops in while */
46 
47 np_tcpjob_t *
48 create_tcp_job(np_job_t *genjob, int filesize)
49 {
50 	np_tcpjob_t *tcpjob;
51 
52 	if (genjob == NULL)
53 		return (NULL);
54 
55 	tcpjob = (np_tcpjob_t *)malloc(sizeof (np_tcpjob_t));
56 	ASSERT(tcpjob, MALLOC_ERR);
57 	(void) memset(tcpjob, 0, sizeof (np_tcpjob_t));
58 
59 	tcpjob->np_port = "9100";
60 	tcpjob->gen_data = genjob;
61 	tcpjob->gen_data->filesize = filesize;
62 
63 	return (tcpjob);
64 }
65 
66 int
67 tcp_open(char *dest, np_tcpjob_t *tcpjob, int timeout)
68 {
69 	struct hostent *hp;
70 	struct sockaddr_in6 serv_addr;
71 	int	s,
72 		err,
73 		error_num;
74 	unsigned timo = 1;
75 	int retry;
76 	int rtnerr;
77 
78 	/*
79 	 * Get the host address and port number to connect to.
80 	 */
81 	if (dest == NULL) {
82 		return (-1);
83 	}
84 
85 	if ((hp = (getipnodebyname(dest, AF_INET6, AI_DEFAULT,
86 		    &error_num))) == NULL) {
87 		(void) fprintf(stderr,
88 		gettext("Netpr: System call getipnodebyname fails\n"));
89 		syslog(LOG_DEBUG, "System call getipnodebyname fails "
90 		    "getipnodebyname() returned %d", error_num);
91 		return (-1);
92 	}
93 
94 	(void) memset(&serv_addr, 0, sizeof (struct sockaddr_in6));
95 	bcopy(hp->h_addr, (caddr_t)&serv_addr.sin6_addr, hp->h_length);
96 	serv_addr.sin6_family = hp->h_addrtype;
97 	serv_addr.sin6_port = (int)htons(atoi(tcpjob->np_port));
98 
99 	do {
100 
101 	retry = 0;
102 	rtnerr = 0;
103 	/*
104 	 * Try connecting to the printer.
105 	 */
106 	s = socket(PF_INET6, SOCK_STREAM, 0);
107 	if (s < 0) {
108 		(void) fprintf(stderr,
109 		    gettext("Netpr: System call socket fails\n"));
110 		syslog(LOG_DEBUG, "System call socket fails");
111 		rtnerr = -1;
112 	} else {
113 		(void) signal(SIGALRM, null_sighandler);
114 		(void) alarm(timeout);
115 		if (connect(s, (struct sockaddr *)&serv_addr,
116 					sizeof (serv_addr)) < 0) {
117 			err = errno;
118 			(void) alarm(0);
119 			errno = err;
120 
121 			if (errno == ECONNREFUSED && timo <= 16) {
122 				(void) sleep(timo);
123 				timo *= 2;
124 				retry++;
125 			} else {
126 			(void) fprintf(stderr,
127 				gettext("Netpr: Cannot connect to printer\n"));
128 				syslog(LOG_DEBUG, "Cannot connect to printer");
129 				rtnerr = -1;
130 			}
131 			/* The connect on this socket failed; close it */
132 			(void) close(s);
133 		} else
134 			(void) alarm(0);
135 	}
136 
137 	} while (retry);
138 
139 	return ((rtnerr) ? rtnerr : s);
140 }
141 
142 
143 int
144 tcp_print(int sockfd, caddr_t pa, np_tcpjob_t *tcpjob)
145 {
146 	char c;
147 	int xfer;
148 	char buf[BUFSIZ + 1];
149 	int nr = 0;
150 	int ctr = 0;
151 	int msg_given = 0;
152 	int nlps = 0;
153 
154 	if ((xfer = xfer_file(sockfd, pa,
155 		tcpjob->gen_data->filesize, tcpjob->gen_data->timeout)) < 0) {
156 			return (xfer);
157 	}
158 
159 	if ((shutdown(sockfd, 1)) != 0) {
160 		(void) fprintf(stderr,
161 		gettext("Netpr: System error: possible loss of data\n"));
162 			syslog(LOG_DEBUG,
163 				"shutdown error; possible loss of data");
164 		return (E_SYSTEM_ERROR);
165 	}
166 
167 
168 	/* read in single character ack or msg from printer */
169 
170 	(void) memset(buf, 0, BUFSIZ + 1);
171 	while (ctr < BUFSIZ) {
172 		(void) signal(SIGALRM, null_sighandler);
173 		(void) alarm(2);
174 		errno = 0;
175 		nr = read(sockfd, &c, 1);
176 		(void) alarm(0);
177 		if (errno == EINTR) {
178 			if (msg_given == 0) {
179 				tell_lptell(ERRORMSG,
180 				gettext("Printer not responding;" \
181 				"Either warming up or needs attention\n"));
182 				msg_given++;
183 			}
184 
185 			/* if no ACK received, do not loop forever */
186 
187 			if (nlps++ >= MAX_NLPS) {
188 				syslog(LOG_DEBUG, "No final ack received");
189 				break;
190 			}
191 		} else {
192 			if ((buf[ctr++] = c) == '\n' || (nr == 0))
193 				break;
194 		}
195 	}
196 	if (ctr > 1)
197 		syslog(LOG_DEBUG, "Message from tcp printer on read: %s",
198 			buf);
199 
200 	if (msg_given && (nlps < MAX_NLPS)) {
201 		(void) fprintf(stderr, gettext("Printer ok\n"));
202 		tell_lptell(OKMSG, "Current");
203 	}
204 
205 	return (E_SUCCESS);
206 }
207