Initial revision

1 files changed, 120 insertions, 0 deletions

diff --git a/netlib.c b/netlib.c
new file mode 100644
index 00000000..d585060d
--- /dev/null
+++ b/netlib.c
@@ -0,0 +1,120 @@
+
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <netinet/in.h>
+#include <varargs.h>
+#include <netdb.h>
+#include <stdio.h>
+
+#if defined (HAVE_SYS_PARAM_H)
+#include <sys/param.h>
+#endif
+
+static char mbuf[128];
+
+int passivesock(char *service, char *protocol, int qlen)
+{
+    struct servent *pse;
+    struct protoent *ppe;
+    struct sockaddr_in sin;
+    int s, type;
+
+    bzero((char *) &sin, sizeof(sin));
+    sin.sin_family = AF_INET;
+    sin.sin_addr.s_addr = INADDR_ANY;
+
+    if (pse = getservbyname(service, protocol))
+	sin.sin_port = htons(ntohs((u_short) pse->s_port));
+    else if ((sin.sin_port = htons((u_short) atoi(service))) == 0) {
+	sprintf(mbuf, "Can't get \"%s\" service entry.\n", service);
+	errexit(mbuf);
+    }
+    if ((ppe = getprotobyname(protocol)) == 0) {
+	sprintf(mbuf, "Can't get \"%s\" protocol entry.\n", protocol);
+	errexit(mbuf);
+    }
+    if (strcmp(protocol, "udp") == 0)
+	type = SOCK_DGRAM;
+    else
+	type = SOCK_STREAM;
+
+    s = socket(PF_INET, type, ppe->p_proto);
+    if (s < 0)
+	errexit("Can't create socket:");
+
+    if (bind(s, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
+	sprintf(mbuf, "Can't bind to port %s", service);
+	errexit(mbuf);
+    }
+    if (type == SOCK_STREAM && listen(s, qlen) < 0) {
+	sprintf(mbuf, "Can't listen on %s port:", service);
+	errexit(mbuf);
+    }
+    return s;
+}
+
+int passiveUDP(char *service, int qlen)
+{
+    return passivesock(service, "udp", qlen);
+}
+
+int passiveTCP(char *service, int qlen)
+{
+    return passivesock(service, "tcp", qlen);
+}
+
+
+int connectsock(char *host, char *service, char *protocol)
+{
+    struct hostent *phe;
+    struct servent *pse;
+    struct protoent *ppe;
+    struct sockaddr_in sin;
+    int s, type;
+
+    bzero((char *) &sin, sizeof(sin));
+    sin.sin_family = AF_INET;
+
+    if (pse = getservbyname(service, protocol))
+	sin.sin_port = htons(ntohs((u_short) pse->s_port));
+    else if ((sin.sin_port = htons((u_short) atoi(service))) == 0) {
+	sprintf(mbuf, "Can't get \"%s\" service entry.\n", service);
+	errexit(mbuf);
+    }
+    if (phe = gethostbyname(host))
+	bcopy(phe->h_addr, (char *) &sin.sin_addr, phe->h_length);
+    else if ((sin.sin_addr.s_addr = inet_addr(host)) == INADDR_NONE) {
+	sprintf(mbuf, "Can't get host entry: \"%s\".\n", host);
+	errexit(mbuf);
+    }
+    if ((ppe = getprotobyname(protocol)) == 0) {
+	sprintf(mbuf, "Can't get \"%s\" protocol entry.\n", protocol);
+	errexit(mbuf);
+    }
+    if (strcmp(protocol, "udp") == 0)
+	type = SOCK_DGRAM;
+    else
+	type = SOCK_STREAM;
+
+    s = socket(PF_INET, type, ppe->p_proto);
+    if (s < 0)
+	errexit("Can't create socket:");
+
+    if (connect(s, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
+	sprintf(mbuf, "Can't connect to %s.%s", host, service);
+	errexit(mbuf);
+    }
+    return s;
+}
+
+int connectUDP(char *host, char *service)
+{
+    return connectsock(host, service, "udp");
+}
+
+int connectTCP(char *host, char *service)
+{
+    return connectsock(host, service, "tcp");
+}