A first version of the tool.

3 files changed, 180 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..2247d5f
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/build
+/dist
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..e2e86e6
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,56 @@
+
+CC=gcc
+LD=gcc
+MKDIR_P=mkdir -p
+RIMRAF=rm -rf
+COPYTO=cp -t
+DIRNAME=dirname
+MD5SUM=md5sum -b
+TAR=tar
+INSTALL_ROOT=/usr/local
+
+CFLAGS=-Wall -Werror -pedantic -std=c89 -fPIC -fmax-errors=1 -DPROJECT_VERSION=$(PROJECT_VERSION) -D_POSIX_C_SOURCE=200112L
+
+LDFLAGS=-Wl,-s,--as-needed,--gc-sections,-pie
+
+LIBS=-dy -lc
+
+PROJECT_VERSION=$(shell (git describe --tags 2>/dev/null|sed 's,^v,,'|egrep .) || date -u +0.0.0-%Y%m%d.%H%M%S)
+
+ARCH=$(shell $(CC) -v 2>&1 | egrep '^Target: ' | sed -E 's,^Target: +(.*)$$,\1,')
+
+.SILENT:
+
+default:
+default: dist/getaddrinfo-$(PROJECT_VERSION)+$(ARCH).tgz
+
+.PHONY: clean
+clean:
+	echo "  RM    build dist"
+	$(RIMRAF) build dist
+
+build/bin/getaddrinfo:
+build/bin/getaddrinfo: build/obj/main/c/getaddrinfocli.o
+	echo "  LN    $@"
+	$(MKDIR_P) "$(shell dirname "$@")"
+	$(LD) -o "$@" $(LDFLAGS) $^ $(LIBS)
+
+build/obj/main/c/getaddrinfocli.o:
+build/obj/main/c/getaddrinfocli.o: src/main/c/getaddrinfocli.c
+	echo "  CC    $@"
+	$(MKDIR_P) "$(shell dirname "$@")"
+	$(CC) -c -o "$@" $(CFLAGS) $^
+
+dist/getaddrinfo-$(PROJECT_VERSION)+$(ARCH).tgz:
+dist/getaddrinfo-$(PROJECT_VERSION)+$(ARCH).tgz: build/bin/getaddrinfo
+	echo "  PKG   $@"
+	$(MKDIR_P) "$(shell dirname "$@")" build/tar build/tar/bin
+	$(COPYTO) build/tar/bin/. build/bin/getaddrinfo
+	echo "version=$(PROJECT_VERSION)" > build/tar/METADATA.INI
+	echo "builtAt=$(shell date -u +%Y-%m-%dT%H:%M:%SZ)" >> build/tar/METADATA.INI
+	$(TAR) --owner=0 --group=0 -czf "$@" -C build/tar METADATA.INI bin/getaddrinfo
+
+.PHONY: install
+install:
+	$(TAR) -f dist/getaddrinfo-*+$(ARCH).tgz -C "$(INSTALL_ROOT)" -x bin
+
diff --git a/src/main/c/getaddrinfocli.c b/src/main/c/getaddrinfocli.c
new file mode 100644
index 0000000..209a4a6
--- /dev/null
+++ b/src/main/c/getaddrinfocli.c
@@ -0,0 +1,122 @@
+#ifdef USERCONFIG
+USERCONFIG
+#endif
+
+#include <arpa/inet.h>
+#include <assert.h>
+#include <errno.h>
+#include <netdb.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+
+#define STR_QUOT_(S) #S
+#define STR_QUOT(S) STR_QUOT_(S)
+
+
+static void printHelp( void ){
+    printf("%s%s%s", "  \n"
+        "  ", strrchr(__FILE__,'/')+1, " - " STR_QUOT(PROJECT_VERSION) "\n"
+        "  \n"
+        "  Print result of getaddrinfo [1] to stdout.\n"
+        "  \n"
+        "  Example:     getaddrinfo  example.com\n"
+        "  \n"
+        "  [1]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getaddrinfo.html\n"
+        "  \n"
+    );
+}
+
+
+int main( int argc, char**argv ){
+    int err;
+    const char *nodename;
+    struct addrinfo *res = NULL, *it;
+    if( argc != 2 ){ fprintf(stderr, "EINVAL: Try --help\n"); err = -1; goto endFn; }
+    if( !strcmp(argv[1], "--help") ){ printHelp(); err = 0; goto endFn; }
+    nodename = argv[1]; assert(nodename != NULL);
+    err = getaddrinfo(nodename, NULL, NULL, &res);
+    if( err != 0 ){
+        const char *ex;
+        switch( err ){
+        case EAI_AGAIN:      ex = "EAI_AGAIN";      break;
+        case EAI_BADFLAGS:   ex = "EAI_BADFLAGS";   break;
+        case EAI_FAIL:       ex = "EAI_FAIL";       break;
+        case EAI_FAMILY:     ex = "EAI_FAMILY";     break;
+        case EAI_MEMORY:     ex = "EAI_MEMORY";     break;
+        case EAI_NONAME:     ex = "EAI_NONAME";     break;
+        case EAI_SERVICE:    ex = "EAI_SERVICE";    break;
+        case EAI_SOCKTYPE:   ex = "EAI_SOCKTYPE";   break;
+        case EAI_SYSTEM:     ex = "EAI_SYSTEM";     break;
+#ifdef EAI_ADDRFAMILY
+        case EAI_ADDRFAMILY: ex = "EAI_ADDRFAMILY"; break;
+#endif
+#ifdef EAI_NODATA
+        case EAI_NODATA:     ex = "EAI_NODATA";     break;
+#endif
+        default:
+            assert(!fprintf(stderr,"ERROR: getaddrinfo(): %d  %s:%d\n", err, __FILE__, __LINE__));
+            ex = NULL;
+        }
+        printf("%s: getaddrinfo(\"%s\")\n", ex, nodename);
+        err = -1; goto endFn;
+    }
+    printf("C: %-6s  %-6s  %-5s  %-4s  %s\n", "AF", "SOCK", "PROTO", "FLGS", "ADDR");
+    for( it = res ; it != NULL ; it = it->ai_next ){
+        const char *afStr, *typStr, *protoStr;
+        switch( it->ai_family ){
+        case AF_UNIX  : afStr = "UNIX"  ; break;
+        case AF_INET  : afStr = "INET"  ; break;
+        case AF_INET6 : afStr = "INET6" ; break;
+        case AF_UNSPEC: afStr = "UNSPEC"; break;
+        default: assert(!fprintf(stderr,"TODO: ai_family %d\n", it->ai_family)); afStr = NULL;
+        }
+        switch( it->ai_socktype ){
+        case SOCK_STREAM: typStr = "STREAM"; break;
+        case SOCK_DGRAM : typStr = "DGRAM" ; break;
+        case SOCK_RAW   : typStr = "RAW"   ; break;
+        default: assert(!fprintf(stderr, "TODO: ai_socktype %d\n", it->ai_socktype)); typStr = NULL;
+        }
+        switch( it->ai_protocol ){
+        case 0: protoStr = "0"; break;
+        case IPPROTO_TCP: protoStr = "TCP"; break;
+        case IPPROTO_UDP: protoStr = "UDP"; break;
+        default: assert(!fprintf(stderr, "TODO: ai_protocol %d\n", it->ai_protocol)); protoStr = NULL;
+        }
+        printf("R: %-6s  %-6s  %-5s  0x%02X",
+            afStr,
+            typStr,
+            protoStr,
+            it->ai_flags
+        );
+        switch( it->ai_family ){
+        case AF_UNIX: /*TODO anything useful to print here?*/ break;
+        case AF_INET: {
+            #define ADDR4 ((struct sockaddr_in*)it->ai_addr)
+            uint_least32_t ip;
+            assert(it->ai_addrlen == 16);
+            assert(ADDR4->sin_family == AF_INET);
+            ip = ntohl(ADDR4->sin_addr.s_addr);
+            printf("  %d.%d.%d.%d", ip >> 24 & 0xFF, ip >> 16 & 0xFF, ip >> 8 & 0xFF, ip & 0xFF);
+            break; }
+            #undef ADDR4
+        case AF_INET6: {
+            #define ADDR6 ((struct sockaddr_in6*)it->ai_addr)
+            char buf[INET6_ADDRSTRLEN + 1];
+            if( inet_ntop(it->ai_family, &ADDR6->sin6_addr, buf, sizeof buf) == NULL ){
+                snprintf(buf, sizeof buf, "inet_ntop(): errno=%d", errno);
+            }
+            printf("  %s", buf);
+            break; }
+            #undef ADDR6
+        default: assert(!fprintf(stderr,"TODO: ai_family %d\n", it->ai_family));
+        }
+        if( it->ai_canonname != NULL ) printf("  cn=\"%s\"", it->ai_canonname);
+        puts("");
+    }
+    err = 0;
+endFn:
+    if( res != NULL ) freeaddrinfo(res);
+    return !!err;
+}
+