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- #ifndef lint
- static char *sccsid = "@(#)clientlib.c 1.11 (Berkeley) 10/27/89";
- #endif
-
- /*
- * NNTP client routines.
- */
-
- /*
- * Include configuration parameters only if we're made in the nntp tree.
- */
-
- #ifdef FOR_NN
- #include "conf.h"
- #endif
-
- #ifdef NNTPSRC
- #include "../config.h"
- #endif NNTPSRC
-
- #include <stdio.h>
- #ifndef FOR_NN
- #include <sys/types.h>
- #endif
- #include <sys/socket.h>
- #ifdef FOR_NN
- #if !defined(NETWORK_DATABASE) || defined(NETWORK_BYTE_ORDER)
- #include <netinet/in.h>
- #endif
- #else
- #include <netinet/in.h>
- #endif
- #ifndef EXCELAN
- # include <netdb.h>
- #endif not EXCELAN
-
- #ifndef FOR_NN
- #ifdef USG
- # define index strchr
- # define bcopy(a,b,c) memcpy(b,a,c)
- # define bzero(a,b) memset(a,'\0',b)
- #endif USG
- #endif
-
- #ifdef EXCELAN
- # define IPPORT_NNTP 119
- #endif
-
- #ifdef DECNET
- #include <netdnet/dn.h>
- #include <netdnet/dnetdb.h>
- #endif DECNET
-
- #include "nntp.h"
-
- FILE *ser_rd_fp = NULL;
- FILE *ser_wr_fp = NULL;
-
- /*
- * getserverbyfile Get the name of a server from a named file.
- * Handle white space and comments.
- * Use NNTPSERVER environment variable if set.
- *
- * Parameters: "file" is the name of the file to read.
- *
- * Returns: Pointer to static data area containing the
- * first non-ws/comment line in the file.
- * NULL on error (or lack of entry in file).
- *
- * Side effects: None.
- */
-
- char *
- getserverbyfile(file)
- char *file;
- {
- register FILE *fp;
- register char *cp;
- static char buf[256];
- char *index();
- char *getenv();
- char *strcpy();
-
- if (cp = getenv("NNTPSERVER")) {
- (void) strcpy(buf, cp);
- return (buf);
- }
-
- if (file == NULL)
- return (NULL);
-
- fp = fopen(file, "r");
- if (fp == NULL)
- return (NULL);
-
- while (fgets(buf, sizeof (buf), fp) != NULL) {
- if (*buf == '\n' || *buf == '#')
- continue;
- cp = index(buf, '\n');
- if (cp)
- *cp = '\0';
- (void) fclose(fp);
- return (buf);
- }
-
- (void) fclose(fp);
- return (NULL); /* No entry */
- }
-
-
- /*
- * server_init Get a connection to the remote news server.
- *
- * Parameters: "machine" is the machine to connect to.
- *
- * Returns: -1 on error
- * server's initial response code on success.
- *
- * Side effects: Connects to server.
- * "ser_rd_fp" and "ser_wr_fp" are fp's
- * for reading and writing to server.
- */
-
- server_init(machine)
- char *machine;
- {
- int sockt_rd, sockt_wr;
- char line[256];
- char *index();
- #ifdef DECNET
- char *cp;
-
- cp = index(machine, ':');
-
- if (cp && cp[1] == ':') {
- *cp = '\0';
- sockt_rd = get_dnet_socket(machine);
- } else
- sockt_rd = get_tcp_socket(machine);
- #else
- sockt_rd = get_tcp_socket(machine);
- #endif
-
- if (sockt_rd < 0)
- return (-1);
-
- /*
- * Now we'll make file pointers (i.e., buffered I/O) out of
- * the socket file descriptor. Note that we can't just
- * open a fp for reading and writing -- we have to open
- * up two separate fp's, one for reading, one for writing.
- */
-
- if ((ser_rd_fp = fdopen(sockt_rd, "r")) == NULL) {
- perror("server_init: fdopen #1");
- return (-1);
- }
-
- sockt_wr = dup(sockt_rd);
- if ((ser_wr_fp = fdopen(sockt_wr, "w")) == NULL) {
- perror("server_init: fdopen #2");
- ser_rd_fp = NULL; /* from above */
- return (-1);
- }
-
- /* Now get the server's signon message */
-
- (void) get_server(line, sizeof(line));
- return (atoi(line));
- }
-
-
- /*
- * get_tcp_socket -- get us a socket connected to the news server.
- *
- * Parameters: "machine" is the machine the server is running on.
- *
- * Returns: Socket connected to the news server if
- * all is ok, else -1 on error.
- *
- * Side effects: Connects to server.
- *
- * Errors: Printed via perror.
- */
-
- get_tcp_socket(machine)
- char *machine;
- {
- int s;
- struct sockaddr_in sin;
- #ifndef EXCELAN
- struct servent *getservbyname(), *sp;
- struct hostent *gethostbyname(), *hp;
- #ifdef h_addr
- int x = 0;
- register char **cp;
- #endif h_addr
-
- if ((sp = getservbyname("nntp", "tcp")) == NULL) {
- fprintf(stderr, "nntp/tcp: Unknown service.\n");
- return (-1);
- }
-
- /*
- * Name resolution doesn't quite go as far as it should. Take things
- * one stage further to allow nnn.nnn.nnn.nnn addresses if all else
- * fails.
- */
- if( (hp = gethostbyname( machine ) ) == NULL ) {
- unsigned long inet_addr();
- static struct hostent def;
- static struct in_addr defaddr;
- static char *alist[1];
- static char namebuf[ 256 ];
- defaddr.s_addr = inet_addr( machine );
- if( defaddr.s_addr != -1 ) {
- strcpy( namebuf, machine );
- def.h_name = namebuf;
- #ifdef h_addr
- def.h_addr_list = alist;
- #endif
- def.h_addr = (char *)&defaddr;
- def.h_length = sizeof( struct in_addr );
- def.h_addrtype = AF_INET;
- def.h_aliases = 0;
- hp = &def;
- }
- }
- if (hp == NULL) {
- fprintf(stderr, "%s: Unknown host.\n", machine);
- return (-1);
- }
-
- bzero((char *) &sin, sizeof(sin));
- sin.sin_family = hp->h_addrtype;
- sin.sin_port = sp->s_port;
- #else EXCELAN
- bzero((char *) &sin, sizeof(sin));
- sin.sin_family = AF_INET;
- sin.sin_port = htons(IPPORT_NNTP);
- #endif EXCELAN
-
- /*
- * The following is kinda gross. The name server under 4.3
- * returns a list of addresses, each of which should be tried
- * in turn if the previous one fails. However, 4.2 hostent
- * structure doesn't have this list of addresses.
- * Under 4.3, h_addr is a #define to h_addr_list[0].
- * We use this to figure out whether to include the NS specific
- * code...
- */
-
- #ifdef h_addr
-
- /* get a socket and initiate connection -- use multiple addresses */
-
- for (cp = hp->h_addr_list; cp && *cp; cp++) {
- s = socket(hp->h_addrtype, SOCK_STREAM, 0);
- if (s < 0) {
- perror("socket");
- return (-1);
- }
- bcopy(*cp, (char *)&sin.sin_addr, hp->h_length);
-
- if (x < 0)
- fprintf(stderr, "trying %s\n", inet_ntoa(sin.sin_addr));
- x = connect(s, (struct sockaddr *)&sin, sizeof (sin));
- if (x == 0)
- break;
- fprintf(stderr, "connection to %s: ", inet_ntoa(sin.sin_addr));
- perror("");
- (void) close(s);
- }
- if (x < 0) {
- fprintf(stderr, "giving up...\n");
- return (-1);
- }
- #else /* no name server */
- #ifdef EXCELAN
- if ((s = rresvport(SO_KEEPALIVE)) < 0)
- {
- /* Get the socket */
- perror("socket");
- return (-1);
- }
- /* set up addr for the connect */
- sin.sin_addr.s_addr = rhost(machine);
- if (sin.sin_addr.s_addr < 0){
- fprintf(stderr, "%s: Unknown host.\n", machine);
- return (-1);
- }
- /* And then connect */
-
- if (connect(s, &sin) < 0) {
- perror("connect");
- (void) close(s);
- return (-1);
- }
- #else not EXCELAN
- if ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
- perror("socket");
- return (-1);
- }
-
- /* And then connect */
-
- bcopy(hp->h_addr, (char *) &sin.sin_addr, hp->h_length);
- if (connect(s, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
- perror("connect");
- (void) close(s);
- return (-1);
- }
-
- #endif not EXCELAN
- #endif
-
- return (s);
- }
-
- #ifdef DECNET
- /*
- * get_dnet_socket -- get us a socket connected to the news server.
- *
- * Parameters: "machine" is the machine the server is running on.
- *
- * Returns: Socket connected to the news server if
- * all is ok, else -1 on error.
- *
- * Side effects: Connects to server.
- *
- * Errors: Printed via nerror.
- */
-
- get_dnet_socket(machine)
- char *machine;
- {
- int s, area, node;
- struct sockaddr_dn sdn;
- struct nodeent *getnodebyname(), *np;
-
- bzero((char *) &sdn, sizeof(sdn));
-
- switch (s = sscanf( machine, "%d%*[.]%d", &area, &node )) {
- case 1:
- node = area;
- area = 0;
- case 2:
- node += area*1024;
- sdn.sdn_add.a_len = 2;
- sdn.sdn_family = AF_DECnet;
- sdn.sdn_add.a_addr[0] = node % 256;
- sdn.sdn_add.a_addr[1] = node / 256;
- break;
- default:
- if ((np = getnodebyname(machine)) == NULL) {
- fprintf(stderr,
- "%s: Unknown host.\n", machine);
- return (-1);
- } else {
- bcopy(np->n_addr,
- (char *) sdn.sdn_add.a_addr,
- np->n_length);
- sdn.sdn_add.a_len = np->n_length;
- sdn.sdn_family = np->n_addrtype;
- }
- break;
- }
- sdn.sdn_objnum = 0;
- sdn.sdn_flags = 0;
- sdn.sdn_objnamel = strlen("NNTP");
- bcopy("NNTP", &sdn.sdn_objname[0], sdn.sdn_objnamel);
-
- if ((s = socket(AF_DECnet, SOCK_STREAM, 0)) < 0) {
- nerror("socket");
- return (-1);
- }
-
- /* And then connect */
-
- if (connect(s, (struct sockaddr *) &sdn, sizeof(sdn)) < 0) {
- nerror("connect");
- close(s);
- return (-1);
- }
-
- return (s);
- }
- #endif
-
-
-
- /*
- * handle_server_response
- *
- * Print some informative messages based on the server's initial
- * response code. This is here so inews, rn, etc. can share
- * the code.
- *
- * Parameters: "response" is the response code which the
- * server sent us, presumably from "server_init",
- * above.
- * "server" is the news server we got the
- * response code from.
- *
- * Returns: -1 if the error is fatal (and we should exit).
- * 0 otherwise.
- *
- * Side effects: None.
- */
-
- handle_server_response(response, server)
- int response;
- char *server;
- {
- switch (response) {
- case OK_NOPOST: /* fall through */
- printf(
- "NOTE: This machine does not have permission to post articles.\n");
- printf(
- " Please don't waste your time trying.\n\n");
-
- case OK_CANPOST:
- return (0);
- break;
-
- case ERR_ACCESS:
- printf(
- "This machine does not have permission to use the %s news server.\n",
- server);
- return (-1);
- break;
-
- default:
- printf("Unexpected response code from %s news server: %d\n",
- server, response);
- return (-1);
- break;
- }
- /*NOTREACHED*/
- }
-
-
- /*
- * put_server -- send a line of text to the server, terminating it
- * with CR and LF, as per ARPA standard.
- *
- * Parameters: "string" is the string to be sent to the
- * server.
- *
- * Returns: Nothing.
- *
- * Side effects: Talks to the server.
- *
- * Note: This routine flushes the buffer each time
- * it is called. For large transmissions
- * (i.e., posting news) don't use it. Instead,
- * do the fprintf's yourself, and then a final
- * fflush.
- */
-
- void
- put_server(string)
- char *string;
- {
- #ifdef DEBUG
- fprintf(stderr, ">>> %s\n", string);
- #endif
- fprintf(ser_wr_fp, "%s\r\n", string);
- (void) fflush(ser_wr_fp);
- }
-
-
- /*
- * get_server -- get a line of text from the server. Strips
- * CR's and LF's.
- *
- * Parameters: "string" has the buffer space for the
- * line received.
- * "size" is the size of the buffer.
- *
- * Returns: -1 on error, 0 otherwise.
- *
- * Side effects: Talks to server, changes contents of "string".
- */
-
- get_server(string, size)
- char *string;
- int size;
- {
- register char *cp;
- char *index();
-
- if (fgets(string, size, ser_rd_fp) == NULL)
- return (-1);
-
- if ((cp = index(string, '\r')) != NULL)
- *cp = '\0';
- else if ((cp = index(string, '\n')) != NULL)
- *cp = '\0';
- #ifdef DEBUG
- fprintf(stderr, "<<< %s\n", string);
- #endif
-
- return (0);
- }
-
-
- /*
- * close_server -- close the connection to the server, after sending
- * the "quit" command.
- *
- * Parameters: None.
- *
- * Returns: Nothing.
- *
- * Side effects: Closes the connection with the server.
- * You can't use "put_server" or "get_server"
- * after this routine is called.
- */
-
- void
- close_server()
- {
- char ser_line[256];
-
- if (ser_wr_fp == NULL || ser_rd_fp == NULL)
- return;
-
- put_server("QUIT");
- (void) get_server(ser_line, sizeof(ser_line));
-
- (void) fclose(ser_wr_fp);
- (void) fclose(ser_rd_fp);
- }
-
-