Adding upstream version 1.8.27.upstream/1.8.27upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 412 insertions, 0 deletions

diff --git a/lib/util/getaddrinfo.c b/lib/util/getaddrinfo.c
new file mode 100644
index 0000000..046e4db
--- /dev/null
+++ b/lib/util/getaddrinfo.c
@@ -0,0 +1,412 @@
+/*
+ * Replacement for a missing getaddrinfo.
+ *
+ * This is an implementation of getaddrinfo for systems that don't have one so
+ * that networking code can use a consistant interface without #ifdef.  It is
+ * a fairly minimal implementation, with the following limitations:
+ *
+ *   - IPv4 support only.  IPv6 is not supported.
+ *   - AI_ADDRCONFIG is ignored.
+ *   - Not thread-safe due to gethostbyname and getservbyname.
+ *   - SOCK_DGRAM and SOCK_STREAM only.
+ *   - Multiple possible socket types only generate one addrinfo struct.
+ *   - Protocol hints aren't used correctly.
+ *
+ * The last four issues could probably be easily remedied, but haven't been
+ * needed to date.  Adding IPv6 support isn't worth it; systems with IPv6
+ * support should already support getaddrinfo natively.
+ *
+ * The canonical version of this file is maintained in the rra-c-util package,
+ * which can be found at <http://www.eyrie.org/~eagle/software/rra-c-util/>.
+ *
+ * Written by Russ Allbery <rra@stanford.edu>
+ *
+ * The authors hereby relinquish any claim to any copyright that they may have
+ * in this work, whether granted under contract or by operation of law or
+ * international treaty, and hereby commit to the public, at large, that they
+ * shall not, at any time in the future, seek to enforce any copyright in this
+ * work against any person or entity, or prevent any person or entity from
+ * copying, publishing, distributing or creating derivative works of this
+ * work.
+ */
+
+#include <config.h>
+
+#ifndef HAVE_GETADDRINFO
+
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#ifdef HAVE_STRING_H
+# include <string.h>
+#endif /* HAVE_STRING_H */
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif /* HAVE_STRINGS_H */
+#include <limits.h>
+#include <netdb.h>
+#include <errno.h>
+
+#include <arpa/inet.h>
+#include <netinet/in.h>
+#ifdef NEED_RESOLV_H
+# include <arpa/nameser.h>
+# include <resolv.h>
+#endif /* NEED_RESOLV_H */
+
+#include "sudo_compat.h"
+#include "compat/getaddrinfo.h"
+
+/* We need access to h_errno to map errors from gethostbyname. */
+#ifndef HAVE_DECL_H_ERRNO
+extern int h_errno;
+#endif
+
+/*
+ * The netdb constants, which aren't always defined (particularly if h_errno
+ * isn't declared).  We also make sure that a few of the less-used ones are
+ * defined so that we can deal with them in case statements.
+ */
+#ifndef HOST_NOT_FOUND
+# define HOST_NOT_FOUND 1
+# define TRY_AGAIN      2
+# define NO_RECOVERY    3
+# define NO_DATA        4
+#endif
+#ifndef NETDB_INTERNAL
+# define NETDB_INTERNAL -1
+#endif
+
+/*
+ * If we're running the test suite, rename the functions to avoid conflicts
+ * with the system version.  Note that we don't rename the structures and
+ * constants, but that should be okay (except possibly for gai_strerror).
+ */
+#ifdef TESTING
+# define gai_strerror test_gai_strerror
+# define freeaddrinfo test_freeaddrinfo
+# define getaddrinfo  test_getaddrinfo
+const char *test_gai_strerror(int);
+void test_freeaddrinfo(struct addrinfo *);
+int test_getaddrinfo(const char *, const char *, const struct addrinfo *,
+                     struct addrinfo **);
+#endif
+
+/*
+ * If the native platform doesn't support AI_NUMERICSERV or AI_NUMERICHOST,
+ * pick some other values for them.
+ */
+#ifdef TESTING
+# if AI_NUMERICSERV == 0
+#  undef AI_NUMERICSERV
+#  define AI_NUMERICSERV 0x0080
+# endif
+# if AI_NUMERICHOST == 0
+#  undef AI_NUMERICHOST
+#  define AI_NUMERICHOST 0x0100
+# endif
+#endif
+
+/*
+ * Value representing all of the hint flags set.  Linux uses flags up to
+ * 0x0400, so be sure not to break when testing on that platform.
+ */
+#ifdef TESTING
+# ifdef HAVE_GETADDRINFO
+#  define AI_INTERNAL_ALL 0x04ff
+# else
+#  define AI_INTERNAL_ALL 0x01ff
+# endif
+#else
+# define AI_INTERNAL_ALL 0x007f
+#endif
+
+/* Table of strings corresponding to the EAI_* error codes. */
+static const char * const gai_errors[] = {
+    "Host name lookup failure",         /*  1 EAI_AGAIN */
+    "Invalid flag value",               /*  2 EAI_BADFLAGS */
+    "Unknown server error",             /*  3 EAI_FAIL */
+    "Unsupported address family",       /*  4 EAI_FAMILY */
+    "Memory allocation failure",        /*  5 EAI_MEMORY */
+    "Host unknown or not given",        /*  6 EAI_NONAME */
+    "Service not supported for socket", /*  7 EAI_SERVICE */
+    "Unsupported socket type",          /*  8 EAI_SOCKTYPE */
+    "System error",                     /*  9 EAI_SYSTEM */
+    "Supplied buffer too small",        /* 10 EAI_OVERFLOW */
+};
+
+/* Macro to set the len attribute of sockaddr_in. */
+#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
+# define sin_set_length(s) ((s)->sin_len = sizeof(struct sockaddr_in))
+#else
+# define sin_set_length(s) /* empty */
+#endif
+
+/*
+ * Return a constant string for a given EAI_* error code or a string
+ * indicating an unknown error.
+ */
+const char *
+sudo_gai_strerror(int ecode)
+{
+    if (ecode < 1 || (size_t) ecode > nitems(gai_errors))
+        return "Unknown error";
+    else
+        return gai_errors[ecode - 1];
+}
+
+
+/*
+ * Free a linked list of addrinfo structs.
+ */
+void
+sudo_freeaddrinfo(struct addrinfo *ai)
+{
+    struct addrinfo *next;
+
+    while (ai != NULL) {
+        next = ai->ai_next;
+        if (ai->ai_addr != NULL)
+            free(ai->ai_addr);
+        if (ai->ai_canonname != NULL)
+            free(ai->ai_canonname);
+        free(ai);
+        ai = next;
+    }
+}
+
+
+/*
+ * Allocate a new addrinfo struct, setting some defaults given that this
+ * implementation is IPv4 only.  Also allocates an attached sockaddr_in and
+ * zeroes it, per the requirement for getaddrinfo.  Takes the socktype,
+ * canonical name (which is copied if not NULL), address, and port.  Returns
+ * NULL on a memory allocation failure.
+ */
+static struct addrinfo *
+gai_addrinfo_new(int socktype, const char *canonical, struct in_addr addr,
+                 unsigned short port)
+{
+    struct addrinfo *ai;
+
+    ai = malloc(sizeof(*ai));
+    if (ai == NULL)
+        return NULL;
+    ai->ai_addr = malloc(sizeof(struct sockaddr_in));
+    if (ai->ai_addr == NULL) {
+        free(ai);
+        return NULL;
+    }
+    ai->ai_next = NULL;
+    if (canonical == NULL)
+        ai->ai_canonname = NULL;
+    else {
+        ai->ai_canonname = strdup(canonical);
+        if (ai->ai_canonname == NULL) {
+            freeaddrinfo(ai);
+            return NULL;
+        }
+    }
+    memset(ai->ai_addr, 0, sizeof(struct sockaddr_in));
+    ai->ai_flags = 0;
+    ai->ai_family = AF_INET;
+    ai->ai_socktype = socktype;
+    ai->ai_protocol = (socktype == SOCK_DGRAM) ? IPPROTO_UDP : IPPROTO_TCP;
+    ai->ai_addrlen = sizeof(struct sockaddr_in);
+    ((struct sockaddr_in *) ai->ai_addr)->sin_family = AF_INET;
+    ((struct sockaddr_in *) ai->ai_addr)->sin_addr = addr;
+    ((struct sockaddr_in *) ai->ai_addr)->sin_port = htons(port);
+    sin_set_length((struct sockaddr_in *) ai->ai_addr);
+    return ai;
+}
+
+
+/*
+ * Look up a service.  Takes the service name (which may be numeric), the hint
+ * flags, a pointer to the socket type (used to determine whether TCP or UDP
+ * services are of interest and, if 0, is filled in with the result of
+ * getservbyname if the service was not numeric), and a pointer to the
+ * addrinfo struct to fill in.  Returns 0 on success or an EAI_* error on
+ * failure.
+ */
+static int
+gai_service(const char *servname, int flags, int *type, unsigned short *port)
+{
+    struct servent *servent;
+    const char *protocol;
+    const char *errstr;
+    unsigned short value;
+
+    value = strtonum(servname, 0, USHRT_MAX, &errstr);
+    if (errstr == NULL) {
+        *port = value;
+    } else if (errno == ERANGE) {
+	return EAI_SERVICE;
+    } else {
+        if (flags & AI_NUMERICSERV)
+            return EAI_NONAME;
+        if (*type != 0)
+            protocol = (*type == SOCK_DGRAM) ? "udp" : "tcp";
+        else
+            protocol = NULL;
+
+        /*
+         * We really technically should be generating an addrinfo struct for
+         * each possible protocol unless type is set, but this works well
+         * enough for what I need this for.
+         */
+        servent = getservbyname(servname, protocol);
+        if (servent == NULL)
+            return EAI_NONAME;
+        if (strcmp(servent->s_proto, "udp") == 0)
+            *type = SOCK_DGRAM;
+        else if (strcmp(servent->s_proto, "tcp") == 0)
+            *type = SOCK_STREAM;
+        else
+            return EAI_SERVICE;
+        *port = htons(servent->s_port);
+    }
+    return 0;
+}
+
+
+/*
+ * Look up a host and fill in a linked list of addrinfo structs with the
+ * results, one per IP address of the returned host.  Takes the name or IP
+ * address of the host as a string, the lookup flags, the type of socket (to
+ * fill into the addrinfo structs), the port (likewise), and a pointer to
+ * where the head of the linked list should be put.  Returns 0 on success or
+ * the appropriate EAI_* error.
+ */
+static int
+gai_lookup(const char *nodename, int flags, int socktype, unsigned short port,
+           struct addrinfo **res)
+{
+    struct addrinfo *ai, *first, *prev;
+    struct in_addr addr;
+    struct hostent *host;
+    const char *canonical;
+    int i;
+
+    if (inet_pton(AF_INET, nodename, &addr)) {
+        canonical = (flags & AI_CANONNAME) ? nodename : NULL;
+        ai = gai_addrinfo_new(socktype, canonical, addr, port);
+        if (ai == NULL)
+            return EAI_MEMORY;
+        *res = ai;
+        return 0;
+    } else {
+        if (flags & AI_NUMERICHOST)
+            return EAI_NONAME;
+        host = gethostbyname(nodename);
+        if (host == NULL)
+            switch (h_errno) {
+            case HOST_NOT_FOUND:
+                return EAI_NONAME;
+            case TRY_AGAIN:
+            case NO_DATA:
+                return EAI_AGAIN;
+            case NO_RECOVERY:
+                return EAI_FAIL;
+            case NETDB_INTERNAL:
+            default:
+                return EAI_SYSTEM;
+            }
+        if (host->h_addr_list[0] == NULL)
+            return EAI_FAIL;
+        canonical = (flags & AI_CANONNAME)
+            ? ((host->h_name != NULL) ? host->h_name : nodename)
+            : NULL;
+        first = NULL;
+        prev = NULL;
+        for (i = 0; host->h_addr_list[i] != NULL; i++) {
+            if (host->h_length != sizeof(addr)) {
+                freeaddrinfo(first);
+                return EAI_FAIL;
+            }
+            memcpy(&addr, host->h_addr_list[i], sizeof(addr));
+            ai = gai_addrinfo_new(socktype, canonical, addr, port);
+            if (ai == NULL) {
+                freeaddrinfo(first);
+                return EAI_MEMORY;
+            }
+            if (first == NULL) {
+                first = ai;
+                prev = ai;
+            } else {
+                prev->ai_next = ai;
+                prev = ai;
+            }
+        }
+        *res = first;
+        return 0;
+    }
+}
+
+
+/*
+ * The actual getaddrinfo implementation.
+ */
+int
+sudo_getaddrinfo(const char *nodename, const char *servname,
+            const struct addrinfo *hints, struct addrinfo **res)
+{
+    struct addrinfo *ai;
+    struct in_addr addr;
+    int flags, socktype, status;
+    unsigned short port;
+
+    /* Take the hints into account and check them for validity. */
+    if (hints != NULL) {
+        flags = hints->ai_flags;
+        socktype = hints->ai_socktype;
+        if ((flags & AI_INTERNAL_ALL) != flags)
+            return EAI_BADFLAGS;
+        if (hints->ai_family != AF_UNSPEC && hints->ai_family != AF_INET)
+            return EAI_FAMILY;
+        if (socktype != 0 && socktype != SOCK_STREAM && socktype != SOCK_DGRAM)
+            return EAI_SOCKTYPE;
+
+        /* EAI_SOCKTYPE isn't quite right, but there isn't anything better. */
+        if (hints->ai_protocol != 0) {
+            int protocol = hints->ai_protocol;
+            if (protocol != IPPROTO_TCP && protocol != IPPROTO_UDP)
+                return EAI_SOCKTYPE;
+        }
+    } else {
+        flags = 0;
+        socktype = 0;
+    }
+
+    /*
+     * See what we're doing.  If nodename is null, either AI_PASSIVE is set or
+     * we're getting information for connecting to a service on the loopback
+     * address.  Otherwise, we're getting information for connecting to a
+     * remote system.
+     */
+    if (servname == NULL)
+        port = 0;
+    else {
+        status = gai_service(servname, flags, &socktype, &port);
+        if (status != 0)
+            return status;
+    }
+    if (nodename != NULL)
+        return gai_lookup(nodename, flags, socktype, port, res);
+    else {
+        if (servname == NULL)
+            return EAI_NONAME;
+        if ((flags & AI_PASSIVE) == AI_PASSIVE)
+            addr.s_addr = INADDR_ANY;
+        else
+            addr.s_addr = htonl(0x7f000001UL);
+        ai = gai_addrinfo_new(socktype, NULL, addr, port);
+        if (ai == NULL)
+            return EAI_MEMORY;
+        *res = ai;
+        return 0;
+    }
+}
+#endif /* HAVE_GETADDRINFO */