X-Git-Url: https://git.distorted.org.uk/~mdw/secnet/blobdiff_plain/927950400bd569326c3babf4e29038523fa464a6..ee697dd98d0f9aca6b9df7ffb32d3a15b4e33d6d:/util.c

diff --git a/util.c b/util.c
index de182a4..9c8abb3 100644
--- a/util.c
+++ b/util.c
@@ -36,9 +36,11 @@
 #include <limits.h>
 #include <assert.h>
 #include <sys/wait.h>
+#include <adns.h>
 #include "util.h"
 #include "unaligned.h"
 #include "magic.h"
+#include "ipaddr.h"
 
 #define MIN_BUFFER_SIZE 64
 #define DEFAULT_BUFFER_SIZE 4096
@@ -162,6 +164,20 @@ int32_t write_mpbin(MP_INT *a, uint8_t *buffer, int32_t buflen)
     return i;
 }
 
+void setcloexec(int fd) {
+    int r=fcntl(fd, F_GETFD);
+    if (r<0) fatal_perror("fcntl(,F_GETFD) failed");
+    r=fcntl(fd, F_SETFD, r|FD_CLOEXEC);
+    if (r<0) fatal_perror("fcntl(,F_SETFD,|FD_CLOEXEC) failed");
+}
+
+void pipe_cloexec(int fd[2]) {
+    int r=pipe(fd);
+    if (r) fatal_perror("pipe");
+    setcloexec(fd[0]);
+    setcloexec(fd[1]);
+}
+
 static const char *phases[NR_PHASES]={
     "PHASE_INIT",
     "PHASE_GETOPTS",
@@ -247,7 +263,7 @@ void buffer_assert_used(struct buffer_if *buffer, cstring_t file,
 
 void buffer_init(struct buffer_if *buffer, int32_t max_start_pad)
 {
-    assert(max_start_pad<=buffer->len);
+    assert(max_start_pad<=buffer->alloclen);
     buffer->start=buffer->base+max_start_pad;
     buffer->size=0;
 }
@@ -289,7 +305,7 @@ void buf_append_string(struct buffer_if *buf, cstring_t s)
     len=strlen(s);
     /* fixme: if string is longer than 65535, result is a corrupted packet */
     buf_append_uint16(buf,len);
-    memcpy(buf_append(buf,len),s,len);
+    BUF_ADD_BYTES(append,buf,s,len);
 }
 
 void buffer_new(struct buffer_if *buf, int32_t len)
@@ -300,7 +316,7 @@ void buffer_new(struct buffer_if *buf, int32_t len)
     buf->loc.file=NULL;
     buf->loc.line=0;
     buf->size=0;
-    buf->len=len;
+    buf->alloclen=len;
     buf->start=NULL;
     buf->base=safe_malloc(len,"buffer_new");
 }
@@ -312,7 +328,7 @@ void buffer_readonly_view(struct buffer_if *buf, const void *data, int32_t len)
     buf->flags=0;
     buf->loc.file=NULL;
     buf->loc.line=0;
-    buf->size=buf->len=len;
+    buf->size=buf->alloclen=len;
     buf->base=buf->start=(uint8_t*)data;
 }
 
@@ -323,10 +339,10 @@ void buffer_readonly_clone(struct buffer_if *out, const struct buffer_if *in)
 
 void buffer_copy(struct buffer_if *dst, const struct buffer_if *src)
 {
-    if (dst->len < src->len) {
-	dst->base=realloc(dst->base,src->len);
+    if (dst->alloclen < src->alloclen) {
+	dst->base=realloc(dst->base,src->alloclen);
 	if (!dst->base) fatal_perror("buffer_copy");
-	dst->len = src->len;
+	dst->alloclen = src->alloclen;
     }
     dst->start = dst->base + (src->start - src->base);
     dst->size = src->size;
@@ -462,3 +478,106 @@ extern void slilog_part(struct log_if *lf, int priority, const char *message, ..
     vslilog_part(lf,priority,message,ap);
     va_end(ap);
 }
+
+void string_item_to_iaddr(const item_t *item, uint16_t port, union iaddr *ia,
+			  const char *desc)
+{
+#ifndef CONFIG_IPV6
+
+    ia->sin.sin_family=AF_INET;
+    ia->sin.sin_addr.s_addr=string_item_to_ipaddr(item,desc);
+
+#else /* CONFIG_IPV6 => we have adns_text2addr */
+
+    if (item->type!=t_string)
+	cfgfatal(item->loc,desc,"expecting a string IP (v4 or v6) address\n");
+    socklen_t salen=sizeof(*ia);
+    int r=adns_text2addr(item->data.string, port,
+			 adns_qf_addrlit_ipv4_quadonly,
+			 &ia->sa, &salen);
+    assert(r!=ENOSPC);
+    if (r) cfgfatal(item->loc,desc,"invalid IP (v4 or v6) address: %s\n",
+		    strerror(r));
+
+#endif /* CONFIG_IPV6 */
+}
+
+#define IADDR_NBUFS_SHIFT 3
+#define IADDR_NBUFS (1 << IADDR_NBUFS_SHIFT)
+
+const char *iaddr_to_string(const union iaddr *ia)
+{
+    static int b;
+
+    b++;
+    b &= IADDR_NBUFS-1;
+
+#ifndef CONFIG_IPV6
+
+    static char bufs[IADDR_NBUFS][100];
+
+    assert(ia->sa.sa_family == AF_INET);
+
+    snprintf(bufs[b], sizeof(bufs[b]), "[%s]:%d",
+	     inet_ntoa(ia->sin.sin_addr),
+	     ntohs(ia->sin.sin_port));
+
+#else /* CONFIG_IPV6 => we have adns_addr2text */
+
+    static char bufs[IADDR_NBUFS][1+ADNS_ADDR2TEXT_BUFLEN+20];
+
+    int port;
+
+    char *addrbuf = bufs[b];
+    *addrbuf++ = '[';
+    int addrbuflen = ADNS_ADDR2TEXT_BUFLEN;
+
+    int r = adns_addr2text(&ia->sa, 0, addrbuf, &addrbuflen, &port);
+    if (r) {
+	const char fmt[]= "scoped IPv6 addr, error: %.*s";
+	sprintf(addrbuf, fmt,
+		ADNS_ADDR2TEXT_BUFLEN - sizeof(fmt) /* underestimate */,
+		strerror(r));
+    }
+
+    char *portbuf = addrbuf;
+    int addrl = strlen(addrbuf);
+    portbuf += addrl;
+
+    snprintf(portbuf, sizeof(bufs[b])-addrl, "]:%d", port);
+
+#endif /* CONFIG_IPV6 */
+
+    return bufs[b];
+}
+
+bool_t iaddr_equal(const union iaddr *ia, const union iaddr *ib)
+{
+    if (ia->sa.sa_family != ib->sa.sa_family)
+	return 0;
+    switch (ia->sa.sa_family) {
+    case AF_INET:
+	return ia->sin.sin_addr.s_addr == ib->sin.sin_addr.s_addr
+	    && ia->sin.sin_port        == ib->sin.sin_port;
+#ifdef CONFIG_IPV6
+    case AF_INET6:
+	return !memcmp(&ia->sin6.sin6_addr, &ib->sin6.sin6_addr, 16)
+	    && ia->sin6.sin6_scope_id  == ib->sin6.sin6_scope_id
+	    && ia->sin6.sin6_port      == ib->sin6.sin6_port
+	    /* we ignore the flowinfo field */;
+#endif /* CONFIG_IPV6 */
+    default:
+	abort();
+    }
+}
+
+int iaddr_socklen(const union iaddr *ia)
+{
+    switch (ia->sa.sa_family) {
+    case AF_INET:  return sizeof(ia->sin);
+#ifdef CONFIG_IPV6
+    case AF_INET6: return sizeof(ia->sin6);
+#endif /* CONFIG_IPV6 */
+    default:       abort();
+    }
+}