github.com/afumu/libc@v0.0.6/musl/src/network/getaddrinfo.c (about)

     1  #include <stdlib.h>
     2  #include <sys/socket.h>
     3  #include <netinet/in.h>
     4  #include <netdb.h>
     5  #include <string.h>
     6  #include <pthread.h>
     7  #include <unistd.h>
     8  #include <endian.h>
     9  #include <errno.h>
    10  #include "lookup.h"
    11  
    12  int getaddrinfo(const char *restrict host, const char *restrict serv, const struct addrinfo *restrict hint, struct addrinfo **restrict res)
    13  {
    14  	struct service ports[MAXSERVS];
    15  	struct address addrs[MAXADDRS];
    16  	char canon[256], *outcanon;
    17  	int nservs, naddrs, nais, canon_len, i, j, k;
    18  	int family = AF_UNSPEC, flags = 0, proto = 0, socktype = 0;
    19  	struct aibuf *out;
    20  
    21  	if (!host && !serv) return EAI_NONAME;
    22  
    23  	if (hint) {
    24  		family = hint->ai_family;
    25  		flags = hint->ai_flags;
    26  		proto = hint->ai_protocol;
    27  		socktype = hint->ai_socktype;
    28  
    29  		const int mask = AI_PASSIVE | AI_CANONNAME | AI_NUMERICHOST |
    30  			AI_V4MAPPED | AI_ALL | AI_ADDRCONFIG | AI_NUMERICSERV;
    31  		if ((flags & mask) != flags)
    32  			return EAI_BADFLAGS;
    33  
    34  		switch (family) {
    35  		case AF_INET:
    36  		case AF_INET6:
    37  		case AF_UNSPEC:
    38  			break;
    39  		default:
    40  			return EAI_FAMILY;
    41  		}
    42  	}
    43  
    44  	if (flags & AI_ADDRCONFIG) {
    45  		abort(); //TODO-
    46  	// 	/* Define the "an address is configured" condition for address
    47  	// 	 * families via ability to create a socket for the family plus
    48  	// 	 * routability of the loopback address for the family. */
    49  	// 	static const struct sockaddr_in lo4 = {
    50  	// 		.sin_family = AF_INET, .sin_port = 65535,
    51  	// 		.sin_addr.s_addr = __BYTE_ORDER == __BIG_ENDIAN
    52  	// 			? 0x7f000001 : 0x0100007f
    53  	// 	};
    54  	// 	static const struct sockaddr_in6 lo6 = {
    55  	// 		.sin6_family = AF_INET6, .sin6_port = 65535,
    56  	// 		.sin6_addr = IN6ADDR_LOOPBACK_INIT
    57  	// 	};
    58  	// 	int tf[2] = { AF_INET, AF_INET6 };
    59  	// 	const void *ta[2] = { &lo4, &lo6 };
    60  	// 	socklen_t tl[2] = { sizeof lo4, sizeof lo6 };
    61  	// 	for (i=0; i<2; i++) {
    62  	// 		if (family==tf[1-i]) continue;
    63  	// 		int s = socket(tf[i], SOCK_CLOEXEC|SOCK_DGRAM,
    64  	// 			IPPROTO_UDP);
    65  	// 		if (s>=0) {
    66  	// 			int cs;
    67  	// 			pthread_setcancelstate(
    68  	// 				PTHREAD_CANCEL_DISABLE, &cs);
    69  	// 			int r = connect(s, ta[i], tl[i]);
    70  	// 			pthread_setcancelstate(cs, 0);
    71  	// 			close(s);
    72  	// 			if (!r) continue;
    73  	// 		}
    74  	// 		switch (errno) {
    75  	// 		case EADDRNOTAVAIL:
    76  	// 		case EAFNOSUPPORT:
    77  	// 		case EHOSTUNREACH:
    78  	// 		case ENETDOWN:
    79  	// 		case ENETUNREACH:
    80  	// 			break;
    81  	// 		default:
    82  	// 			return EAI_SYSTEM;
    83  	// 		}
    84  	// 		if (family == tf[i]) return EAI_NONAME;
    85  	// 		family = tf[1-i];
    86  	// 	}
    87  	}
    88  
    89  	nservs = __lookup_serv(ports, serv, proto, socktype, flags);
    90  	if (nservs < 0) return nservs;
    91  
    92  	naddrs = __lookup_name(addrs, canon, host, family, flags);
    93  	if (naddrs < 0) return naddrs;
    94  
    95  	nais = nservs * naddrs;
    96  	canon_len = strlen(canon);
    97  	out = calloc(1, nais * sizeof(*out) + canon_len + 1);
    98  	if (!out) return EAI_MEMORY;
    99  
   100  	if (canon_len) {
   101  		outcanon = (void *)&out[nais];
   102  		memcpy(outcanon, canon, canon_len+1);
   103  	} else {
   104  		outcanon = 0;
   105  	}
   106  
   107  	for (k=i=0; i<naddrs; i++) for (j=0; j<nservs; j++, k++) {
   108  		out[k].slot = k;
   109  		//TODO out[k].ai = (struct addrinfo){
   110  		//TODO 	.ai_family = addrs[i].family,
   111  		//TODO 	.ai_socktype = ports[j].socktype,
   112  		//TODO 	.ai_protocol = ports[j].proto,
   113  		//TODO 	.ai_addrlen = addrs[i].family == AF_INET
   114  		//TODO 		? sizeof(struct sockaddr_in)
   115  		//TODO 		: sizeof(struct sockaddr_in6),
   116  		//TODO 	.ai_addr = (void *)&out[k].sa,
   117  		//TODO 	.ai_canonname = outcanon };
   118  		out[k].ai.ai_family = addrs[i].family;
   119  		out[k].ai.ai_socktype = ports[j].socktype;
   120  		out[k].ai.ai_protocol = ports[j].proto;
   121  		out[k].ai.ai_addrlen = addrs[i].family == AF_INET
   122  			? sizeof(struct sockaddr_in)
   123  			: sizeof(struct sockaddr_in6);
   124  		out[k].ai.ai_addr = (void *)&out[k].sa;
   125  		out[k].ai.ai_canonname = outcanon;
   126  		if (k) out[k-1].ai.ai_next = &out[k].ai;
   127  		switch (addrs[i].family) {
   128  		case AF_INET:
   129  			out[k].sa.sin.sin_family = AF_INET;
   130  			out[k].sa.sin.sin_port = htons(ports[j].port);
   131  			memcpy(&out[k].sa.sin.sin_addr, &addrs[i].addr, 4);
   132  			break;
   133  		case AF_INET6:
   134  			out[k].sa.sin6.sin6_family = AF_INET6;
   135  			out[k].sa.sin6.sin6_port = htons(ports[j].port);
   136  			out[k].sa.sin6.sin6_scope_id = addrs[i].scopeid;
   137  			memcpy(&out[k].sa.sin6.sin6_addr, &addrs[i].addr, 16);
   138  			break;			
   139  		}
   140  	}
   141  	out[0].ref = nais;
   142  	*res = &out->ai;
   143  	return 0;
   144  }