summaryrefslogtreecommitdiff
path: root/src/network/getaddrinfo.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/network/getaddrinfo.c')
-rw-r--r--src/network/getaddrinfo.c224
1 files changed, 224 insertions, 0 deletions
diff --git a/src/network/getaddrinfo.c b/src/network/getaddrinfo.c
new file mode 100644
index 00000000..90e85f6a
--- /dev/null
+++ b/src/network/getaddrinfo.c
@@ -0,0 +1,224 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <unistd.h>
+#include <string.h>
+#include <ctype.h>
+#include "__dns.h"
+#include "stdio_impl.h"
+
+static int is_valid(const char *host)
+{
+ const unsigned char *s;
+ if (strlen(host)-1 > 254 || mbstowcs(0, host, 0) > 255) return 0;
+ for (s=host; *s>=0x80 || *s=='.' || *s=='-' || isalnum(*s); s++);
+ return !*s;
+}
+
+#if 0
+static int have_af(int family)
+{
+ struct sockaddr_in6 sin6 = { .sin6_family = family };
+ socklen_t sl = family == AF_INET
+ ? sizeof(struct sockaddr_in)
+ : sizeof(struct sockaddr_in6);
+ int sock = socket(family, SOCK_STREAM, 0);
+ int have = !bind(sock, (void *)&sin6, sl);
+ close(sock);
+ return have;
+}
+#endif
+
+#include <stdlib.h>
+#include <netdb.h>
+
+union sa {
+ struct sockaddr_in sin;
+ struct sockaddr_in6 sin6;
+};
+
+struct aibuf {
+ struct addrinfo ai;
+ union sa sa;
+};
+
+/* Extra slots needed for storing canonical name */
+#define EXTRA ((256+sizeof(struct aibuf)-1)/sizeof(struct aibuf))
+
+int getaddrinfo(const char *host, const char *serv, const struct addrinfo *hint, struct addrinfo **res)
+{
+ int flags = hint ? hint->ai_flags : 0;
+ int family = hint ? hint->ai_family : AF_UNSPEC;
+ int type = hint ? hint->ai_socktype : 0;
+ int proto = hint ? hint->ai_protocol : 0;
+ unsigned long port = 0;
+ struct aibuf *buf;
+ union sa sa = {{0}};
+ unsigned char reply[1024];
+ int i, j;
+ //char hostbuf[256];
+ char line[512];
+ FILE *f, _f;
+ unsigned char _buf[64];
+ char *z;
+ int result;
+ int cnt;
+
+ if (host && strlen(host)>255) return EAI_NONAME;
+ if (serv && strlen(serv)>32) return EAI_SERVICE;
+
+ if (type && !proto)
+ proto = type==SOCK_DGRAM ? IPPROTO_UDP : IPPROTO_TCP;
+ if (!type && proto)
+ type = proto==IPPROTO_UDP ? SOCK_DGRAM : SOCK_STREAM;
+
+ if (serv) {
+ port = strtoul(serv, &z, 0);
+ if (!*z && port > 65535) return EAI_SERVICE;
+ if (!port) {
+ if (flags & AI_NUMERICSERV) return EAI_SERVICE;
+
+ //f = fopen("/etc/services", "rb");
+ return EAI_SERVICE;
+ }
+ port = htons(port);
+ }
+
+ if (!host) {
+ if (family == AF_UNSPEC) family = AF_INET;
+ buf = calloc(sizeof *buf, 1+EXTRA);
+ if (!buf) return EAI_MEMORY;
+ buf->ai.ai_protocol = proto;
+ buf->ai.ai_socktype = type;
+ buf->ai.ai_addr = (void *)&buf->sa;
+ buf->ai.ai_addrlen = family==AF_INET6 ? sizeof sa.sin6 : sizeof sa.sin;
+ buf->ai.ai_family = family;
+ buf->sa.sin.sin_family = family;
+ buf->sa.sin.sin_port = port;
+ if (!(flags & AI_PASSIVE)) {
+ if (family == AF_INET) {
+ 0[(uint8_t*)&buf->sa.sin.sin_addr.s_addr]=127;
+ 3[(uint8_t*)&buf->sa.sin.sin_addr.s_addr]=1;
+ } else buf[0].sa.sin6.sin6_addr.s6_addr[15] = 1;
+ }
+ *res = &buf->ai;
+ return 0;
+ }
+
+ /* Try as a numeric address */
+ if (__ipparse(&sa, family, host) >= 0) {
+ buf = calloc(sizeof *buf, 1+EXTRA);
+ if (!buf) return EAI_MEMORY;
+ family = sa.sin.sin_family;
+ buf->ai.ai_protocol = proto;
+ buf->ai.ai_socktype = type;
+ buf->ai.ai_addr = (void *)&buf->sa;
+ buf->ai.ai_addrlen = family==AF_INET6 ? sizeof sa.sin6 : sizeof sa.sin;
+ buf->ai.ai_family = family;
+ buf->sa = sa;
+ buf->sa.sin.sin_port = port;
+ *res = &buf->ai;
+ return 0;
+ }
+
+ if (flags & AI_NUMERICHOST) return EAI_NONAME;
+
+ f = __fopen_rb_ca("/etc/hosts", &_f, _buf, sizeof _buf);
+ if (f) while (fgets(line, sizeof line, f)) {
+ char *p;
+ size_t l = strlen(host);
+
+ if ((p=strchr(line, '#'))) *p++='\n', *p=0;
+ for(p=line+1; (p=strstr(p, host)) &&
+ (!isspace(p[-1]) || !isspace(p[l])); p++);
+ if (!p) continue;
+ __fclose_ca(f);
+
+ /* Isolate IP address to parse */
+ for (p=line; *p && !isspace(*p); p++);
+ *p++ = 0;
+ if (__ipparse(&sa, family, line) < 0) return EAI_NONAME;
+
+ /* Allocate and fill result buffer */
+ buf = calloc(sizeof *buf, 1+EXTRA);
+ if (!buf) return EAI_MEMORY;
+ family = sa.sin.sin_family;
+ buf->ai.ai_protocol = proto;
+ buf->ai.ai_socktype = type;
+ buf->ai.ai_addr = (void *)&buf->sa;
+ buf->ai.ai_addrlen = family==AF_INET6 ? sizeof sa.sin6 : sizeof sa.sin;
+ buf->ai.ai_family = family;
+ buf->sa = sa;
+ buf->sa.sin.sin_port = port;
+
+ /* Extract first name as canonical name */
+ for (; *p && isspace(*p); p++);
+ buf->ai.ai_canonname = (void *)(buf+1);
+ snprintf(buf->ai.ai_canonname, 256, "%s", p);
+ for (p=buf->ai.ai_canonname; *p && !isspace(*p); p++);
+ *p = 0;
+ if (!is_valid(buf->ai.ai_canonname))
+ buf->ai.ai_canonname = 0;
+
+ *res = &buf->ai;
+ return 0;
+ }
+ if (f) __fclose_ca(f);
+
+#if 0
+ f = __fopen_rb_ca("/etc/resolv.conf", &_f, _buf, sizeof _buf);
+ if (f) while (fgets(line, sizeof line, f)) {
+ if (!isspace(line[10]) || (strncmp(line, "search", 6)
+ && strncmp(line, "domain", 6))) continue;
+ }
+ if (f) __fclose_ca(f);
+#endif
+
+ /* Perform one or more DNS queries for host */
+ memset(reply, 0, sizeof reply);
+ result = __dns_query(reply, host, family, 0);
+ if (result < 0) return result;
+
+ cnt = __dns_count_addrs(reply, result);
+ if (cnt <= 0) return EAI_NONAME;
+
+ buf = calloc(sizeof *buf, cnt+EXTRA);
+ if (!buf) return EAI_MEMORY;
+
+ i = 0;
+ if (family != AF_INET6) {
+ j = __dns_get_rr(&buf[i].sa.sin.sin_addr, sizeof *buf, 4, cnt-i, reply, RR_A, 0);
+ while (j--) buf[i++].sa.sin.sin_family = AF_INET;
+ }
+ if (family != AF_INET) {
+ j = __dns_get_rr(&buf[i].sa.sin6.sin6_addr, sizeof *buf, 16, cnt-i, reply, RR_AAAA, 0);
+ while (j--) buf[i++].sa.sin.sin_family = AF_INET6;
+ }
+ if (result>1) {
+ j = __dns_get_rr(&buf[i].sa.sin.sin_addr, sizeof *buf, 4, cnt-i, reply+512, RR_A, 0);
+ while (j--) buf[i++].sa.sin.sin_family = AF_INET;
+ j = __dns_get_rr(&buf[i].sa.sin6.sin6_addr, sizeof *buf, 16, cnt-i, reply+512, RR_AAAA, 0);
+ while (j--) buf[i++].sa.sin.sin_family = AF_INET6;
+ }
+
+ if (__dns_get_rr((void *)&buf[cnt], 0, 256, 1, reply, RR_CNAME, 1) < 0)
+ strcpy((void *)&buf[cnt], host);
+
+ for (i=0; i<cnt; i++) {
+ buf[i].ai.ai_protocol = proto;
+ buf[i].ai.ai_socktype = type;
+ buf[i].ai.ai_addr = (void *)&buf[i].sa;
+ buf[i].ai.ai_addrlen = buf[i].sa.sin.sin_family==AF_INET6
+ ? sizeof sa.sin6 : sizeof sa.sin;
+ buf[i].ai.ai_family = buf[i].sa.sin.sin_family;
+ buf[i].sa.sin.sin_port = port;
+ buf[i].ai.ai_next = &buf[i+1].ai;
+ buf[i].ai.ai_canonname = (void *)&buf[cnt];
+ }
+ buf[cnt-1].ai.ai_next = 0;
+ *res = &buf->ai;
+
+ return 0;
+}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-28 14:14:02 +0000