106 lines
2.3 KiB
C
106 lines
2.3 KiB
C
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/*
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* fake library for ssh
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*
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* This file includes getaddrinfo(), freeaddrinfo() and gai_strerror().
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* These funtions are defined in rfc2133.
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*
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* But these functions are not implemented correctly. The minimum subset
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* is implemented for ssh use only. For exapmle, this routine assumes
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* that ai_family is AF_INET. Don't use it for another purpose.
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*/
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#include "system.h"
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#include "ipv4.h"
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#include "ipv6.h"
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#include "fake-getaddrinfo.h"
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#include "xalloc.h"
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#ifndef HAVE_GAI_STRERROR
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char *gai_strerror(int ecode)
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{
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switch (ecode) {
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case EAI_NODATA:
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return "No address associated with hostname";
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case EAI_MEMORY:
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return "Memory allocation failure";
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case EAI_FAMILY:
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return "Address family not supported";
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default:
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return "Unknown error";
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}
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}
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#endif /* !HAVE_GAI_STRERROR */
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#ifndef HAVE_FREEADDRINFO
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void freeaddrinfo(struct addrinfo *ai)
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{
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struct addrinfo *next;
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while(ai) {
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next = ai->ai_next;
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free(ai);
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ai = next;
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}
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}
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#endif /* !HAVE_FREEADDRINFO */
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#ifndef HAVE_GETADDRINFO
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static struct addrinfo *malloc_ai(uint16_t port, uint32_t addr)
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{
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struct addrinfo *ai;
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ai = xmalloc_and_zero(sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
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ai->ai_addr = (struct sockaddr *)(ai + 1);
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ai->ai_addrlen = sizeof(struct sockaddr_in);
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ai->ai_addr->sa_family = ai->ai_family = AF_INET;
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((struct sockaddr_in *)(ai)->ai_addr)->sin_port = port;
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((struct sockaddr_in *)(ai)->ai_addr)->sin_addr.s_addr = addr;
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return ai;
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}
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int getaddrinfo(const char *hostname, const char *servname, const struct addrinfo *hints, struct addrinfo **res)
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{
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struct addrinfo *prev = NULL;
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struct hostent *hp;
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struct in_addr in = {0};
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int i;
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uint16_t port = 0;
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if(hints && hints->ai_family != AF_INET && hints->ai_family != AF_UNSPEC)
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return EAI_FAMILY;
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if (servname)
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port = htons(atoi(servname));
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if (hints && hints->ai_flags & AI_PASSIVE) {
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*res = malloc_ai(port, htonl(0x00000000));
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return 0;
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}
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if (!hostname) {
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*res = malloc_ai(port, htonl(0x7f000001));
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return 0;
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}
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hp = gethostbyname(hostname);
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if(!hp || !hp->h_addr_list || !hp->h_addr_list[0])
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return EAI_NODATA;
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for (i = 0; hp->h_addr_list[i]; i++) {
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*res = malloc_ai(port, ((struct in_addr *)hp->h_addr_list[i])->s_addr);
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if(prev)
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prev->ai_next = *res;
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prev = *res;
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}
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return 0;
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}
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#endif /* !HAVE_GETADDRINFO */
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