* added some socket stuff

[citadel.git] / ctdlsh / src / sockets.c

diff --git a/ctdlsh/src/sockets.c b/ctdlsh/src/sockets.c
new file mode 100644 (file)
index 0000000..00f0d7e
--- /dev/null
+++ b/ctdlsh/src/sockets.c
@@ -0,0 +1,206 @@
+/*
+ *
+ */
+
+#include <config.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <sys/time.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>
+
+#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;
+       struct sockaddr_in egress_sin;
+       int s, type;
+
+       if (host == NULL) return(-1);
+       if (service == NULL) return(-1);
+       if (protocol == NULL) return(-1);
+
+       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) {
+               fprintf(stderr, "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) {
+               fprintf(stderr, "Can't get %s host entry: %s\n",
+                       host, strerror(errno));
+               return(-1);
+       }
+       if ((ppe = getprotobyname(protocol)) == 0) {
+               fprintf(stderr, "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) {
+               fprintf(stderr, "Can't create socket: %s\n", strerror(errno));
+               return(-1);
+       }
+
+       /* Now try to connect to the remote host. */
+       if (connect(s, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
+               fprintf(stderr, "Can't connect to %s:%s: %s\n",
+                       host, service, strerror(errno));
+               close(s);
+               return(-1);
+       }
+
+       return (s);
+}
+
+
+
+/*
+ * sock_read_to() - input binary data from socket, with a settable timeout.
+ * Returns the number of bytes read, or -1 for error.
+ * If keep_reading_until_full is nonzero, we keep reading until we get the number of requested bytes
+ */
+int sock_read_to(int sock, char *buf, int bytes, int timeout, int keep_reading_until_full)
+{
+       int len,rlen;
+       fd_set rfds;
+       struct timeval tv;
+       int retval;
+
+       len = 0;
+       while (len<bytes) {
+               FD_ZERO(&rfds);
+               FD_SET(sock, &rfds);
+               tv.tv_sec = timeout;
+               tv.tv_usec = 0;
+
+               retval = select(sock+1, &rfds, NULL, NULL, &tv);
+
+               if (FD_ISSET(sock, &rfds) == 0) {       /* timed out */
+                       fprintf(stderr, "sock_read() timed out.\n");
+                       return(-1);
+               }
+
+               rlen = read(sock, &buf[len], bytes-len);
+               if (rlen<1) {
+                       fprintf(stderr, "sock_read() failed: %s\n",
+                               strerror(errno));
+                       return(-1);
+               }
+               len = len + rlen;
+               if (!keep_reading_until_full) return(len);
+       }
+       return(bytes);
+}
+
+
+/*
+ * 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 keep_reading_until_full)
+{
+       return sock_read_to(sock, buf, bytes, 30, keep_reading_until_full);
+}
+
+
+/*
+ * 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_getln(int sock, char *buf, int bufsize)
+{
+       int i;
+
+       /* Read one character at a time.
+        */
+       for (i = 0;; i++) {
+               if (sock_read(sock, &buf[i], 1, 1) < 0) return(-1);
+               if (buf[i] == '\n' || i == (bufsize-1))
+                       break;
+       }
+
+       /* If we got a long line, discard characters until the newline.
+        */
+       if (i == (bufsize-1))
+               while (buf[i] != '\n')
+                       if (sock_read(sock, &buf[i], 1, 1) < 0) return(-1);
+
+       /* Strip any trailing CR and LF characters.
+        */
+       buf[i] = 0;
+       while ( (i > 0)
+               && ( (buf[i - 1]==13)
+                    || ( buf[i - 1]==10)) ) {
+               i--;
+               buf[i] = 0;
+       }
+       return(i);
+}
+
+
+
+/*
+ * 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);
+}