From eeac69b2168c5a65f9608771006ccc43033cbd23 Mon Sep 17 00:00:00 2001
From: daniel <daniel@planethacker.net>
Date: Wed, 7 May 2025 09:45:50 -0700
Subject: initial commit

---
 surplus.c | 201 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 201 insertions(+)
 create mode 100644 surplus.c

(limited to 'surplus.c')

diff --git a/surplus.c b/surplus.c
new file mode 100644
index 0000000..6dfbea4
--- /dev/null
+++ b/surplus.c
@@ -0,0 +1,201 @@
+/*
+ * LOKI3
+ *
+ * [ surplus.c ]
+ *
+ *  1996/7 Guild Corporation Worldwide      [daemon9]
+ */
+
+#include "loki.h"
+
+extern int verbose;
+extern jmp_buf env;
+
+
+/*
+ *  Domain names / dotted-decimals --> network byte order.
+ */
+uint32_t name_resolve(char *hostname) {
+	struct in_addr addr;
+	struct hostent *hostEnt;
+
+	/* name lookup failure */
+	if ((addr.s_addr = inet_addr(hostname)) == -1) {
+		if (!(hostEnt = gethostbyname(hostname))) {
+			return 0; // TODO this probably isnt right.
+		}
+
+		bcopy(hostEnt->h_addr, (char *)&addr.s_addr, hostEnt -> h_length);
+	}
+
+	return addr.s_addr;
+}
+
+
+/*
+ *  Network byte order --> dotted-decimals.
+ */
+char *host_lookup(uint32_t in) {
+	char hostname[BUFSIZ] = {0};
+	struct in_addr addr;
+
+	addr.s_addr = in;
+	strcpy(hostname, inet_ntoa(addr));
+
+	return strdup(hostname);
+}
+
+#ifdef X86FAST_CHECK
+
+/*
+ * Fast x86 based assembly implementation of the IP checksum routine.
+ * TODO: Do we still need this?
+ */
+u_short i_check(u_short *buff, int len) {
+	u_long sum = 0;
+	if (len > 3) {
+		__asm__("clc\n"
+				"1:\t"
+				"lodsl\n\t"
+				"adcl %%eax, %%ebx\n\t"
+				"loop 1b\n\t"
+				"adcl $0, %%ebx\n\t"
+				"movl %%ebx, %%eax\n\t"
+				"shrl $16, %%eax\n\t"
+				"addw %%ax, %%bx\n\t"
+				"adcw $0, %%bx"
+				: "=b" (sum) , "=S" (buff)
+				: "0" (sum), "c" (len >> 2) ,"1" (buff)
+				: "ax", "cx", "si", "bx");
+	}
+	if (len & 2) {
+		__asm__("lodsw\n\t"
+				"addw %%ax, %%bx\n\t"
+				"adcw $0, %%bx"
+				: "=b" (sum) , "=S" (buff)
+				: "0" (sum), "c" (len >> 2) ,"1" (buff)
+				: "ax", "cx", "si", "bx");
+	}
+	if (len & 2) {
+		__asm__("lodsw\n\t"
+				"addw %%ax, %%bx\n\t"
+				"adcw $0, %%bx"
+				: "=b" (sum), "=S" (buff)
+				: "0" (sum), "1" (buff)
+				: "bx", "ax", "si");
+	}
+	if (len & 1) {
+		__asm__("lodsb\n\t"
+				"movb $0, %%ah\n\t"
+				"addw %%ax, %%bx\n\t"
+				"adcw $0, %%bx"
+				: "=b" (sum), "=S" (buff)
+				: "0" (sum), "1" (buff)
+				: "bx", "ax", "si");
+	}
+	if (len & 1) {
+		__asm__("lodsb\n\t"
+				"movb $0, %%ah\n\t"
+				"addw %%ax, %%bx\n\t"
+				"adcw $0, %%bx"
+				: "=b" (sum), "=S" (buff)
+				: "0" (sum), "1" (buff)
+				: "bx", "ax", "si");
+	}
+	sum  = ~sum;
+	return (sum & 0xffff);
+}
+
+#else
+
+/*
+ *  Standard IP Family checksum routine.
+ */
+uint16_t i_check(uint16_t *ptr, int nbytes) {
+	register long sum        = 0;
+	uint16_t oddbyte         = 0;
+	register uint16_t answer = 0;
+
+	while (nbytes > 1) {
+		sum += *ptr++;
+		nbytes -= 2;
+	}
+
+	if (nbytes == 1) {
+		oddbyte = 0;
+		*((uint8_t *)&oddbyte) =* (uint8_t *)ptr;
+		sum += oddbyte;
+	}
+	sum     = (sum >> 16) + (sum & 0xffff);     /* add hi 16 to low 16 */
+	sum     += (sum >> 16);
+	answer  = ~sum;
+	return answer;
+}
+#endif  /* X86FAST_CHECK */
+
+
+/*
+ *  Generic exit with error function.  If checkerrno is true, errno should
+ *  be looked at and we call perror, otherwise, just dump to stderr.
+ *  Additionally, we have the option of suppressing the error messages by
+ *  zeroing verbose.
+ */
+void err_exit(int exitstatus, int checkerrno, int verbalkint, char *errstr) {
+	if (verbalkint) {
+		if (checkerrno) {
+			perror(errstr);
+		} else {
+			fprintf(stderr, "%s\n", errstr);
+		}
+	}
+
+	clean_exit(exitstatus);
+}
+
+
+/*
+ *  Clean exit handler
+ */
+void clean_exit(int status) {
+	extern int tsock;
+	extern int ripsock;
+
+	close(ripsock);
+	close(tsock);
+	exit(status);
+}
+
+
+#ifdef  DEBUG
+/*
+ *  Bulk of this function taken from Stevens APUE...
+ *  got this from Mooks (LTC)
+ */
+void fd_status(int fd, int newline) {
+	int accmode = 0, val = 0;
+
+	val = fcntl(fd, F_GETFL, 0);
+
+#if !defined(pyr) && !defined(ibm032) && !defined(sony_news) && !defined(NeXT)
+	accmode = val & O_ACCMODE;
+#else /* pyramid */
+	accmode = val; /* kludge */
+#endif /* pyramid */
+	if (accmode == O_RDONLY)       fprintf(stderr, " read only");
+	else if (accmode == O_WRONLY)  fprintf(stderr, " write only");
+	else if (accmode == O_RDWR)    fprintf(stderr, " read write");
+	if (val & O_APPEND)            fprintf(stderr, " append");
+	if (val & O_NONBLOCK)          fprintf(stderr, " nonblocking");
+	else                           fprintf(stderr, " blocking");
+#if defined(O_SYNC)
+	if (val & O_SYNC)              fprintf(stderr, " sync writes");
+#else
+#if defined(O_FSYNC)
+	if (val & O_FSYNC)             fprintf(stderr, " sync writes");
+#endif /* O_FSYNC */
+#endif /* O_SYNC */
+	if (newline)                   fprintf(stderr, "\r\n");
+}
+#endif /* DEBUG */
+
+/* EOF */
-- 
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