/* include inet_srcrt_init */#include	"unp.h"#include	<netinet/in_systm.h>#include	<netinet/ip.h>static u_char	*optr;		/* pointer into options being formed */static u_char	*lenptr;	/* pointer to length byte in SRR option */static int		ocnt;		/* count of # addresses */u_char *inet_srcrt_init(void){	optr = Malloc(44);	/* NOP, code, len, ptr, up to 10 addresses */	bzero(optr, 44);	/* guarantees EOLs at end */	ocnt = 0;	return(optr);		/* pointer for setsockopt() */}/* end inet_srcrt_init *//* include inet_srcrt_add */intinet_srcrt_add(char *hostptr, int type){	int					len;	struct addrinfo		*ai;	struct sockaddr_in	*sin;	if (ocnt > 9)		err_quit("too many source routes with: %s", hostptr);	if (ocnt == 0) {		*optr++ = IPOPT_NOP;	/* NOP for alignment */		*optr++ = type ? IPOPT_SSRR : IPOPT_LSRR;		lenptr = optr++;		/* we fill in the length later */		*optr++ = 4;			/* offset to first address */	}	ai = Host_serv(hostptr, "", AF_INET, 0);	sin = (struct sockaddr_in *) ai->ai_addr;	memcpy(optr, &sin->sin_addr, sizeof(struct in_addr));	freeaddrinfo(ai);	optr += sizeof(struct in_addr);	ocnt++;	len = 3 + (ocnt * sizeof(struct in_addr));	*lenptr = len;	return(len + 1);	/* size for setsockopt() */}/* end inet_srcrt_add *//* include inet_srcrt_print */voidinet_srcrt_print(u_char *ptr, int len){	u_char			c;	char			str[INET_ADDRSTRLEN];	struct in_addr	*hop1;	memcpy(&hop1, ptr, sizeof(struct in_addr));	ptr += sizeof(struct in_addr);	while ( (c = *ptr++) == IPOPT_NOP)		;		/* skip any leading NOPs */	if (c == IPOPT_LSRR)		printf("received LSRR: ");	else if (c == IPOPT_SSRR)		printf("received SSRR: ");	else {		printf("received option type %d\n", c);		return;	}	printf("%s ", Inet_ntop(AF_INET, &hop1, str, sizeof(str)));	len = *ptr++ - sizeof(struct in_addr);	/* subtract "hop1" */	ptr++;		/* skip over pointer */	while (len > 0) {		printf("%s ", Inet_ntop(AF_INET, ptr, str, sizeof(str)));		ptr += sizeof(struct in_addr);		len -= sizeof(struct in_addr);	}	printf("\n");}/* end inet_srcrt_print */