Simplify fake getname/addrinfo() functions, possibly fixing freeing a NULL pointer.
This commit is contained in:
Guus Sliepen
parent
dbfd6f284e
commit
03995ca52e
2 changed files with 50 additions and 85 deletions
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@ -20,11 +20,11 @@ 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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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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return "Memory allocation failure";
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default:
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return "unknown error.";
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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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@ -34,91 +34,66 @@ void freeaddrinfo(struct addrinfo *ai)
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{
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struct addrinfo *next;
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do {
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while(ai) {
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next = ai->ai_next;
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free(ai);
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} while (NULL != (ai = next));
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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(int port, uint32_t addr)
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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 = malloc(sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
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if (ai == NULL)
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return(NULL);
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memset(ai, 0, sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
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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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/* XXX -- ssh doesn't use sa_len */
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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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return ai;
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}
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int getaddrinfo(const char *hostname, const char *servname,
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const struct addrinfo *hints, struct addrinfo **res)
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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 *cur, *prev = NULL;
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struct addrinfo *prev = NULL;
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struct hostent *hp;
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struct in_addr in;
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int i, port;
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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 (servname)
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port = htons(atoi(servname));
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else
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port = 0;
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if (hints && hints->ai_flags & AI_PASSIVE) {
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if (NULL != (*res = malloc_ai(port, htonl(0x00000000))))
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return 0;
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else
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return EAI_MEMORY;
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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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if (NULL != (*res = malloc_ai(port, htonl(0x7f000001))))
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return 0;
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else
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return EAI_MEMORY;
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}
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#ifdef HAVE_INET_ATON
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if (inet_aton(hostname, &in)) {
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if (NULL != (*res = malloc_ai(port, in.s_addr)))
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return 0;
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else
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return EAI_MEMORY;
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}
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#endif
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hp = gethostbyname(hostname);
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if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) {
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for (i = 0; hp->h_addr_list[i]; i++) {
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cur = malloc_ai(port, ((struct in_addr *)hp->h_addr_list[i])->s_addr);
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if (cur == NULL) {
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if (*res)
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freeaddrinfo(*res);
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return EAI_MEMORY;
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}
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if (prev)
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prev->ai_next = cur;
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else
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*res = cur;
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prev = cur;
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}
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*res = malloc_ai(port, htonl(0x7f000001));
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return 0;
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}
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return EAI_NODATA;
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hp = gethostbyname(hostname);
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if(!hp || !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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@ -16,41 +16,31 @@
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#ifndef HAVE_GETNAMEINFO
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int getnameinfo(const struct sockaddr *sa, size_t salen, char *host,
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size_t hostlen, char *serv, size_t servlen, int flags)
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int getnameinfo(const struct sockaddr *sa, size_t salen, char *host, size_t hostlen, char *serv, size_t servlen, int flags)
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{
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struct sockaddr_in *sin = (struct sockaddr_in *)sa;
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struct hostent *hp;
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char tmpserv[16];
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if (serv) {
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snprintf(tmpserv, sizeof(tmpserv), "%d", ntohs(sin->sin_port));
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if (strlen(tmpserv) >= servlen)
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return EAI_MEMORY;
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else
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strcpy(serv, tmpserv);
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if(serv)
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snprintf(serv, sizeof(tmpserv), "%d", ntohs(sin->sin_port));
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if(!host)
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return 0;
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if(flags & NI_NUMERICHOST) {
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strncpy(host, inet_ntoa(sin->sin_addr), sizeof(host));
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return 0;
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}
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if (host) {
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if (flags & NI_NUMERICHOST) {
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if (strlen(inet_ntoa(sin->sin_addr)) >= hostlen)
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return EAI_MEMORY;
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hp = gethostbyaddr((char *)&sin->sin_addr, sizeof(struct in_addr), AF_INET);
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if(!hp || !hp->h_name)
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return EAI_NODATA;
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if(strlen(hp->h_name) >= hostlen)
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return EAI_MEMORY;
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strcpy(host, inet_ntoa(sin->sin_addr));
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return 0;
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} else {
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hp = gethostbyaddr((char *)&sin->sin_addr,
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sizeof(struct in_addr), AF_INET);
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if (hp == NULL)
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return EAI_NODATA;
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if (strlen(hp->h_name) >= hostlen)
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return EAI_MEMORY;
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strcpy(host, hp->h_name);
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return 0;
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}
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}
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strncpy(host, hp->h_name, hostlen);
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return 0;
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}
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#endif /* !HAVE_GETNAMEINFO */
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