mirror of
https://github.com/sudo-project/sudo.git
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Top level directory reorg
Move src/po -> po Combine common and compat -> lib/util Move zlib -> lib/zlib
This commit is contained in:
Todd C. Miller
422
lib/util/getaddrinfo.c
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422
lib/util/getaddrinfo.c
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/*
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* Replacement for a missing getaddrinfo.
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*
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* This is an implementation of getaddrinfo for systems that don't have one so
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* that networking code can use a consistant interface without #ifdef. It is
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* a fairly minimal implementation, with the following limitations:
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*
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* - IPv4 support only. IPv6 is not supported.
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* - AI_ADDRCONFIG is ignored.
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* - Not thread-safe due to gethostbyname and getservbyname.
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* - SOCK_DGRAM and SOCK_STREAM only.
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* - Multiple possible socket types only generate one addrinfo struct.
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* - Protocol hints aren't used correctly.
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*
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* The last four issues could probably be easily remedied, but haven't been
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* needed to date. Adding IPv6 support isn't worth it; systems with IPv6
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* support should already support getaddrinfo natively.
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*
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* The canonical version of this file is maintained in the rra-c-util package,
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* which can be found at <http://www.eyrie.org/~eagle/software/rra-c-util/>.
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*
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* Written by Russ Allbery <rra@stanford.edu>
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*
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* The authors hereby relinquish any claim to any copyright that they may have
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* in this work, whether granted under contract or by operation of law or
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* international treaty, and hereby commit to the public, at large, that they
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* shall not, at any time in the future, seek to enforce any copyright in this
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* work against any person or entity, or prevent any person or entity from
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* copying, publishing, distributing or creating derivative works of this
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* work.
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*/
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#include <config.h>
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#ifndef HAVE_GETADDRINFO
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <stdio.h>
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#ifdef STDC_HEADERS
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# include <stdlib.h>
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# include <stddef.h>
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#else
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# ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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# endif
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#endif /* STDC_HEADERS */
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif /* HAVE_STRING_H */
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif /* HAVE_STRINGS_H */
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#include <limits.h>
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#include <netdb.h>
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#include <errno.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include "compat/getaddrinfo.h"
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#include "missing.h"
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/* We need access to h_errno to map errors from gethostbyname. */
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#ifndef HAVE_DECL_H_ERRNO
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extern int h_errno;
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#endif
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/*
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* The netdb constants, which aren't always defined (particularly if h_errno
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* isn't declared). We also make sure that a few of the less-used ones are
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* defined so that we can deal with them in case statements.
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*/
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#ifndef HOST_NOT_FOUND
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# define HOST_NOT_FOUND 1
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# define TRY_AGAIN 2
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# define NO_RECOVERY 3
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# define NO_DATA 4
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#endif
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#ifndef NETDB_INTERNAL
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# define NETDB_INTERNAL -1
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#endif
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/*
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* If we're running the test suite, rename the functions to avoid conflicts
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* with the system version. Note that we don't rename the structures and
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* constants, but that should be okay (except possibly for gai_strerror).
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*/
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#ifdef TESTING
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# define gai_strerror test_gai_strerror
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# define freeaddrinfo test_freeaddrinfo
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# define getaddrinfo test_getaddrinfo
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const char *test_gai_strerror(int);
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void test_freeaddrinfo(struct addrinfo *);
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int test_getaddrinfo(const char *, const char *, const struct addrinfo *,
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struct addrinfo **);
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#endif
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/*
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* If the native platform doesn't support AI_NUMERICSERV or AI_NUMERICHOST,
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* pick some other values for them.
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*/
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#ifdef TESTING
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# if AI_NUMERICSERV == 0
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# undef AI_NUMERICSERV
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# define AI_NUMERICSERV 0x0080
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# endif
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# if AI_NUMERICHOST == 0
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# undef AI_NUMERICHOST
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# define AI_NUMERICHOST 0x0100
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# endif
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#endif
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/*
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* Value representing all of the hint flags set. Linux uses flags up to
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* 0x0400, so be sure not to break when testing on that platform.
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*/
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#ifdef TESTING
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# ifdef HAVE_GETADDRINFO
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# define AI_INTERNAL_ALL 0x04ff
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# else
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# define AI_INTERNAL_ALL 0x01ff
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# endif
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#else
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# define AI_INTERNAL_ALL 0x007f
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#endif
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/* Table of strings corresponding to the EAI_* error codes. */
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static const char * const gai_errors[] = {
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"Host name lookup failure", /* 1 EAI_AGAIN */
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"Invalid flag value", /* 2 EAI_BADFLAGS */
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"Unknown server error", /* 3 EAI_FAIL */
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"Unsupported address family", /* 4 EAI_FAMILY */
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"Memory allocation failure", /* 5 EAI_MEMORY */
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"Host unknown or not given", /* 6 EAI_NONAME */
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"Service not supported for socket", /* 7 EAI_SERVICE */
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"Unsupported socket type", /* 8 EAI_SOCKTYPE */
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"System error", /* 9 EAI_SYSTEM */
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"Supplied buffer too small", /* 10 EAI_OVERFLOW */
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};
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/* Macro to set the len attribute of sockaddr_in. */
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#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
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# define sin_set_length(s) ((s)->sin_len = sizeof(struct sockaddr_in))
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#else
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# define sin_set_length(s) /* empty */
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#endif
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/*
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* Used for iterating through arrays. ARRAY_SIZE returns the number of
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* elements in the array (useful for a < upper bound in a for loop).
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*/
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#define ARRAY_SIZE(array) (sizeof(array) / sizeof((array)[0]))
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/*
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* Return a constant string for a given EAI_* error code or a string
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* indicating an unknown error.
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*/
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const char *
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gai_strerror(int ecode)
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{
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if (ecode < 1 || (size_t) ecode > ARRAY_SIZE(gai_errors))
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return "Unknown error";
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else
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return gai_errors[ecode - 1];
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}
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/*
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* Free a linked list of addrinfo structs.
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*/
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void
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freeaddrinfo(struct addrinfo *ai)
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{
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struct addrinfo *next;
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while (ai != NULL) {
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next = ai->ai_next;
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if (ai->ai_addr != NULL)
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free(ai->ai_addr);
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if (ai->ai_canonname != NULL)
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free(ai->ai_canonname);
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free(ai);
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ai = next;
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}
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}
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/*
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* Allocate a new addrinfo struct, setting some defaults given that this
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* implementation is IPv4 only. Also allocates an attached sockaddr_in and
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* zeroes it, per the requirement for getaddrinfo. Takes the socktype,
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* canonical name (which is copied if not NULL), address, and port. Returns
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* NULL on a memory allocation failure.
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*/
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static struct addrinfo *
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gai_addrinfo_new(int socktype, const char *canonical, struct in_addr addr,
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unsigned short port)
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{
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struct addrinfo *ai;
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ai = malloc(sizeof(*ai));
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if (ai == NULL)
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return NULL;
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ai->ai_addr = malloc(sizeof(struct sockaddr_in));
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if (ai->ai_addr == NULL) {
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free(ai);
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return NULL;
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}
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ai->ai_next = NULL;
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if (canonical == NULL)
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ai->ai_canonname = NULL;
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else {
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ai->ai_canonname = strdup(canonical);
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if (ai->ai_canonname == NULL) {
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freeaddrinfo(ai);
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return NULL;
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}
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}
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memset(ai->ai_addr, 0, sizeof(struct sockaddr_in));
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ai->ai_flags = 0;
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ai->ai_family = AF_INET;
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ai->ai_socktype = socktype;
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ai->ai_protocol = (socktype == SOCK_DGRAM) ? IPPROTO_UDP : IPPROTO_TCP;
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ai->ai_addrlen = sizeof(struct sockaddr_in);
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((struct sockaddr_in *) ai->ai_addr)->sin_family = AF_INET;
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((struct sockaddr_in *) ai->ai_addr)->sin_addr = addr;
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((struct sockaddr_in *) ai->ai_addr)->sin_port = htons(port);
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sin_set_length((struct sockaddr_in *) ai->ai_addr);
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return ai;
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}
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/*
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* Look up a service. Takes the service name (which may be numeric), the hint
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* flags, a pointer to the socket type (used to determine whether TCP or UDP
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* services are of interest and, if 0, is filled in with the result of
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* getservbyname if the service was not numeric), and a pointer to the
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* addrinfo struct to fill in. Returns 0 on success or an EAI_* error on
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* failure.
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*/
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static int
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gai_service(const char *servname, int flags, int *type, unsigned short *port)
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{
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struct servent *servent;
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const char *protocol;
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const char *errstr;
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unsigned short value;
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value = strtonum(servname, 0, USHRT_MAX, &errstr);
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if (errstr == NULL) {
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*port = value;
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} else if (errno == ERANGE) {
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return EAI_SERVICE;
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} else {
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if (flags & AI_NUMERICSERV)
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return EAI_NONAME;
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if (*type != 0)
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protocol = (*type == SOCK_DGRAM) ? "udp" : "tcp";
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else
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protocol = NULL;
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/*
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* We really technically should be generating an addrinfo struct for
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* each possible protocol unless type is set, but this works well
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* enough for what I need this for.
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*/
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servent = getservbyname(servname, protocol);
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if (servent == NULL)
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return EAI_NONAME;
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if (strcmp(servent->s_proto, "udp") == 0)
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*type = SOCK_DGRAM;
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else if (strcmp(servent->s_proto, "tcp") == 0)
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*type = SOCK_STREAM;
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else
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return EAI_SERVICE;
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*port = htons(servent->s_port);
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}
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return 0;
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}
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/*
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* Look up a host and fill in a linked list of addrinfo structs with the
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* results, one per IP address of the returned host. Takes the name or IP
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* address of the host as a string, the lookup flags, the type of socket (to
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* fill into the addrinfo structs), the port (likewise), and a pointer to
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* where the head of the linked list should be put. Returns 0 on success or
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* the appropriate EAI_* error.
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*/
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static int
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gai_lookup(const char *nodename, int flags, int socktype, unsigned short port,
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struct addrinfo **res)
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{
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struct addrinfo *ai, *first, *prev;
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struct in_addr addr;
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struct hostent *host;
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const char *canonical;
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int i;
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if (inet_pton(AF_INET, nodename, &addr)) {
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canonical = (flags & AI_CANONNAME) ? nodename : NULL;
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ai = gai_addrinfo_new(socktype, canonical, addr, port);
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if (ai == NULL)
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return EAI_MEMORY;
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*res = ai;
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return 0;
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} else {
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if (flags & AI_NUMERICHOST)
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return EAI_NONAME;
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host = gethostbyname(nodename);
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if (host == NULL)
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switch (h_errno) {
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case HOST_NOT_FOUND:
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return EAI_NONAME;
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case TRY_AGAIN:
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case NO_DATA:
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return EAI_AGAIN;
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case NO_RECOVERY:
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return EAI_FAIL;
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case NETDB_INTERNAL:
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default:
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return EAI_SYSTEM;
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}
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if (host->h_addr_list[0] == NULL)
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return EAI_FAIL;
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canonical = (flags & AI_CANONNAME)
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? ((host->h_name != NULL) ? host->h_name : nodename)
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: NULL;
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first = NULL;
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prev = NULL;
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for (i = 0; host->h_addr_list[i] != NULL; i++) {
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if (host->h_length != sizeof(addr)) {
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freeaddrinfo(first);
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return EAI_FAIL;
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}
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memcpy(&addr, host->h_addr_list[i], sizeof(addr));
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ai = gai_addrinfo_new(socktype, canonical, addr, port);
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if (ai == NULL) {
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freeaddrinfo(first);
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return EAI_MEMORY;
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}
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if (first == NULL) {
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first = ai;
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prev = ai;
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} else {
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prev->ai_next = ai;
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prev = ai;
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}
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}
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*res = first;
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return 0;
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}
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}
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/*
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* The actual getaddrinfo implementation.
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*/
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int
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getaddrinfo(const char *nodename, const char *servname,
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const struct addrinfo *hints, struct addrinfo **res)
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{
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struct addrinfo *ai;
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struct in_addr addr;
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int flags, socktype, status;
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unsigned short port;
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/* Take the hints into account and check them for validity. */
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if (hints != NULL) {
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flags = hints->ai_flags;
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socktype = hints->ai_socktype;
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if ((flags & AI_INTERNAL_ALL) != flags)
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return EAI_BADFLAGS;
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if (hints->ai_family != AF_UNSPEC && hints->ai_family != AF_INET)
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return EAI_FAMILY;
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if (socktype != 0 && socktype != SOCK_STREAM && socktype != SOCK_DGRAM)
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return EAI_SOCKTYPE;
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/* EAI_SOCKTYPE isn't quite right, but there isn't anything better. */
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if (hints->ai_protocol != 0) {
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int protocol = hints->ai_protocol;
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if (protocol != IPPROTO_TCP && protocol != IPPROTO_UDP)
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return EAI_SOCKTYPE;
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}
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} else {
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flags = 0;
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socktype = 0;
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}
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/*
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* See what we're doing. If nodename is null, either AI_PASSIVE is set or
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* we're getting information for connecting to a service on the loopback
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* address. Otherwise, we're getting information for connecting to a
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* remote system.
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*/
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if (servname == NULL)
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port = 0;
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else {
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status = gai_service(servname, flags, &socktype, &port);
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if (status != 0)
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return status;
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}
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if (nodename != NULL)
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return gai_lookup(nodename, flags, socktype, port, res);
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else {
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if (servname == NULL)
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return EAI_NONAME;
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if ((flags & AI_PASSIVE) == AI_PASSIVE)
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addr.s_addr = INADDR_ANY;
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else
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addr.s_addr = htonl(0x7f000001UL);
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ai = gai_addrinfo_new(socktype, NULL, addr, port);
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if (ai == NULL)
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return EAI_MEMORY;
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*res = ai;
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return 0;
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}
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}
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#endif /* HAVE_GETADDRINFO */
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Block a user