+/*
+ * $Id$
+ *
+ * This module handles client-side sockets opened by the Citadel server (for
+ * the client side of Internet protocols, etc.) It does _not_ handle client
+ * sockets for the Citadel client; for that you must look in ipc_c_tcp.c
+ * (which, uncoincidentally, bears a striking similarity to this file).
+ *
+ */
+
+#include "sysdep.h"
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <string.h>
+#include <pwd.h>
+#include <errno.h>
+#include <stdarg.h>
+#include "citadel.h"
+#ifndef HAVE_SNPRINTF
+#include "snprintf.h"
+#endif
+#include "sysdep_decls.h"
+
+#ifndef INADDR_NONE
+#define INADDR_NONE 0xffffffff
+#endif
+
+int sock_connect(char *host, char *service, char *protocol)
+{
+ struct hostent *phe;
+ struct servent *pse;
+ struct protoent *ppe;
+ struct sockaddr_in sin;
+ int s, type;
+
+ memset(&sin, 0, sizeof(sin));
+ sin.sin_family = AF_INET;
+
+ pse = getservbyname(service, protocol);
+ if (pse) {
+ sin.sin_port = pse->s_port;
+ } else if ((sin.sin_port = htons((u_short) atoi(service))) == 0) {
+ lprintf(3, "Can't get %s service entry: %s\n",
+ service, strerror(errno));
+ return(-1);
+ }
+ phe = gethostbyname(host);
+ if (phe) {
+ memcpy(&sin.sin_addr, phe->h_addr, phe->h_length);
+ } else if ((sin.sin_addr.s_addr = inet_addr(host)) == INADDR_NONE) {
+ lprintf(3, "Can't get %s host entry: %s\n",
+ host, strerror(errno));
+ return(-1);
+ }
+ if ((ppe = getprotobyname(protocol)) == 0) {
+ lprintf(3, "Can't get %s protocol entry: %s\n",
+ protocol, strerror(errno));
+ return(-1);
+ }
+ if (!strcmp(protocol, "udp")) {
+ type = SOCK_DGRAM;
+ } else {
+ type = SOCK_STREAM;
+ }
+
+ s = socket(PF_INET, type, ppe->p_proto);
+ if (s < 0) {
+ lprintf(3, "Can't create socket: %s\n", strerror(errno));
+ return(-1);
+ }
+
+/* FIX ... the alarm clock is a problem for multithreaded programs because all
+ * threads receive the signal.
+ signal(SIGALRM, timeout);
+ alarm(30);
+ */
+
+ if (connect(s, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
+ lprintf(3, "can't connect to %s.%s: %s\n",
+ host, service, strerror(errno));
+ return(-1);
+ }
+/*
+ alarm(0);
+ signal(SIGALRM, SIG_IGN);
+ */
+
+ return (s);
+}
+
+/*
+ * sock_read() - input binary data from socket.
+ * Returns the number of bytes read, or -1 for error.
+ */
+int sock_read(int sock, char *buf, int bytes)
+{
+ int len, rlen;
+
+ len = 0;
+ while (len < bytes) {
+ rlen = read(sock, &buf[len], bytes - len);
+ if (rlen < 1) {
+ return (-1);
+ }
+ len = len + rlen;
+ }
+ return (len);
+}
+
+
+/*
+ * sock_write() - send binary to server.
+ * Returns the number of bytes written, or -1 for error.
+ */
+int sock_write(int sock, char *buf, int nbytes)
+{
+ int bytes_written = 0;
+ int retval;
+ while (bytes_written < nbytes) {
+ retval = write(sock, &buf[bytes_written],
+ nbytes - bytes_written);
+ if (retval < 1) {
+ return (-1);
+ }
+ bytes_written = bytes_written + retval;
+ }
+ return (bytes_written);
+}
+
+
+/*
+ * Input string from socket - implemented in terms of sock_read()
+ *
+ */
+int sock_gets(int sock, char *buf)
+{
+ int i;
+
+ /* Read one character at a time.
+ */
+ for (i = 0;; i++) {
+ if (sock_read(sock, &buf[i], 1) < 0) return(-1);
+ if (buf[i] == '\n' || i == 255)
+ break;
+ }
+
+ /* If we got a long line, discard characters until the newline.
+ */
+ if (i == 255)
+ while (buf[i] != '\n')
+ if (sock_read(sock, &buf[i], 1) < 0) return(-1);
+
+ /* Strip any trailing CR and LF characters.
+ */
+ while ( (strlen(buf)>0)
+ && ((buf[strlen(buf)-1]==13)
+ || (buf[strlen(buf)-1]==10)) ) {
+ buf[strlen(buf)-1] = 0;
+ }
+ return(strlen(buf));
+}
+
+
+/*
+ * sock_puts() - send line to server - implemented in terms of serv_write()
+ * Returns the number of bytes written, or -1 for error.
+ */
+int sock_puts(int sock, char *buf)
+{
+ int i, j;
+
+ i = sock_write(sock, buf, strlen(buf));
+ if (i<0) return(i);
+ j = sock_write(sock, "\n", 1);
+ if (j<0) return(j);
+ return(i+j);
+}