mirror of
https://github.com/git/git.git
synced 2024-11-18 16:43:49 +01:00
c41e20b30b
When build a pack for a push we query the remote copy for existant heads. These are used to prune unnecessary objects from the pack. As we receive the remote references in get_remote_heads() we validate the reference names via check_ref() which includes a length check; rejecting those >45 characters in size. This is a miss converted change, it was originally designed to reject messages which were less than 45 characters in length (a 40 character sha1 and refs/) to prevent comparing unitialised memory. check_ref() now gets the raw length so check for at least 5 characters. Signed-off-by: Andy Whitcroft <apw@shadowen.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
746 lines
16 KiB
C
746 lines
16 KiB
C
#include "git-compat-util.h"
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#include "cache.h"
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#include "pkt-line.h"
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#include "quote.h"
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#include "refs.h"
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#include <sys/wait.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <signal.h>
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static char *server_capabilities;
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static int check_ref(const char *name, int len, unsigned int flags)
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{
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if (!flags)
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return 1;
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if (len < 5 || memcmp(name, "refs/", 5))
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return 0;
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/* Skip the "refs/" part */
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name += 5;
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len -= 5;
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/* REF_NORMAL means that we don't want the magic fake tag refs */
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if ((flags & REF_NORMAL) && check_ref_format(name) < 0)
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return 0;
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/* REF_HEADS means that we want regular branch heads */
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if ((flags & REF_HEADS) && !memcmp(name, "heads/", 6))
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return 1;
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/* REF_TAGS means that we want tags */
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if ((flags & REF_TAGS) && !memcmp(name, "tags/", 5))
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return 1;
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/* All type bits clear means that we are ok with anything */
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return !(flags & ~REF_NORMAL);
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}
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/*
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* Read all the refs from the other end
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*/
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struct ref **get_remote_heads(int in, struct ref **list,
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int nr_match, char **match,
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unsigned int flags)
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{
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*list = NULL;
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for (;;) {
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struct ref *ref;
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unsigned char old_sha1[20];
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static char buffer[1000];
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char *name;
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int len, name_len;
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len = packet_read_line(in, buffer, sizeof(buffer));
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if (!len)
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break;
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if (buffer[len-1] == '\n')
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buffer[--len] = 0;
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if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
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die("protocol error: expected sha/ref, got '%s'", buffer);
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name = buffer + 41;
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name_len = strlen(name);
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if (len != name_len + 41) {
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if (server_capabilities)
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free(server_capabilities);
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server_capabilities = xstrdup(name + name_len + 1);
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}
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if (!check_ref(name, name_len, flags))
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continue;
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if (nr_match && !path_match(name, nr_match, match))
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continue;
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ref = xcalloc(1, sizeof(*ref) + len - 40);
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hashcpy(ref->old_sha1, old_sha1);
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memcpy(ref->name, buffer + 41, len - 40);
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*list = ref;
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list = &ref->next;
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}
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return list;
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}
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int server_supports(const char *feature)
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{
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return server_capabilities &&
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strstr(server_capabilities, feature) != NULL;
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}
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int get_ack(int fd, unsigned char *result_sha1)
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{
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static char line[1000];
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int len = packet_read_line(fd, line, sizeof(line));
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if (!len)
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die("git-fetch-pack: expected ACK/NAK, got EOF");
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if (line[len-1] == '\n')
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line[--len] = 0;
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if (!strcmp(line, "NAK"))
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return 0;
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if (!strncmp(line, "ACK ", 4)) {
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if (!get_sha1_hex(line+4, result_sha1)) {
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if (strstr(line+45, "continue"))
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return 2;
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return 1;
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}
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}
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die("git-fetch_pack: expected ACK/NAK, got '%s'", line);
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}
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int path_match(const char *path, int nr, char **match)
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{
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int i;
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int pathlen = strlen(path);
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for (i = 0; i < nr; i++) {
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char *s = match[i];
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int len = strlen(s);
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if (!len || len > pathlen)
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continue;
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if (memcmp(path + pathlen - len, s, len))
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continue;
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if (pathlen > len && path[pathlen - len - 1] != '/')
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continue;
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*s = 0;
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return (i + 1);
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}
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return 0;
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}
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struct refspec {
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char *src;
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char *dst;
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char force;
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};
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/*
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* A:B means fast forward remote B with local A.
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* +A:B means overwrite remote B with local A.
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* +A is a shorthand for +A:A.
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* A is a shorthand for A:A.
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*/
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static struct refspec *parse_ref_spec(int nr_refspec, char **refspec)
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{
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int i;
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struct refspec *rs = xcalloc(sizeof(*rs), (nr_refspec + 1));
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for (i = 0; i < nr_refspec; i++) {
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char *sp, *dp, *ep;
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sp = refspec[i];
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if (*sp == '+') {
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rs[i].force = 1;
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sp++;
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}
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ep = strchr(sp, ':');
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if (ep) {
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dp = ep + 1;
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*ep = 0;
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}
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else
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dp = sp;
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rs[i].src = sp;
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rs[i].dst = dp;
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}
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rs[nr_refspec].src = rs[nr_refspec].dst = NULL;
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return rs;
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}
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static int count_refspec_match(const char *pattern,
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struct ref *refs,
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struct ref **matched_ref)
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{
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int match;
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int patlen = strlen(pattern);
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for (match = 0; refs; refs = refs->next) {
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char *name = refs->name;
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int namelen = strlen(name);
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if (namelen < patlen ||
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memcmp(name + namelen - patlen, pattern, patlen))
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continue;
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if (namelen != patlen && name[namelen - patlen - 1] != '/')
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continue;
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match++;
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*matched_ref = refs;
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}
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return match;
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}
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static void link_dst_tail(struct ref *ref, struct ref ***tail)
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{
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**tail = ref;
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*tail = &ref->next;
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**tail = NULL;
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}
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static struct ref *try_explicit_object_name(const char *name)
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{
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unsigned char sha1[20];
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struct ref *ref;
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int len;
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if (get_sha1(name, sha1))
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return NULL;
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len = strlen(name) + 1;
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ref = xcalloc(1, sizeof(*ref) + len);
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memcpy(ref->name, name, len);
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hashcpy(ref->new_sha1, sha1);
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return ref;
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}
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static int match_explicit_refs(struct ref *src, struct ref *dst,
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struct ref ***dst_tail, struct refspec *rs)
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{
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int i, errs;
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for (i = errs = 0; rs[i].src; i++) {
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struct ref *matched_src, *matched_dst;
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matched_src = matched_dst = NULL;
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switch (count_refspec_match(rs[i].src, src, &matched_src)) {
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case 1:
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break;
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case 0:
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/* The source could be in the get_sha1() format
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* not a reference name.
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*/
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matched_src = try_explicit_object_name(rs[i].src);
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if (matched_src)
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break;
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errs = 1;
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error("src refspec %s does not match any.",
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rs[i].src);
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break;
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default:
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errs = 1;
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error("src refspec %s matches more than one.",
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rs[i].src);
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break;
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}
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switch (count_refspec_match(rs[i].dst, dst, &matched_dst)) {
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case 1:
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break;
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case 0:
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if (!memcmp(rs[i].dst, "refs/", 5)) {
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int len = strlen(rs[i].dst) + 1;
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matched_dst = xcalloc(1, sizeof(*dst) + len);
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memcpy(matched_dst->name, rs[i].dst, len);
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link_dst_tail(matched_dst, dst_tail);
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}
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else if (!strcmp(rs[i].src, rs[i].dst) &&
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matched_src) {
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/* pushing "master:master" when
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* remote does not have master yet.
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*/
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int len = strlen(matched_src->name) + 1;
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matched_dst = xcalloc(1, sizeof(*dst) + len);
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memcpy(matched_dst->name, matched_src->name,
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len);
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link_dst_tail(matched_dst, dst_tail);
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}
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else {
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errs = 1;
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error("dst refspec %s does not match any "
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"existing ref on the remote and does "
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"not start with refs/.", rs[i].dst);
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}
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break;
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default:
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errs = 1;
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error("dst refspec %s matches more than one.",
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rs[i].dst);
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break;
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}
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if (errs)
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continue;
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if (matched_dst->peer_ref) {
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errs = 1;
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error("dst ref %s receives from more than one src.",
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matched_dst->name);
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}
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else {
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matched_dst->peer_ref = matched_src;
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matched_dst->force = rs[i].force;
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}
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}
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return -errs;
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}
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static struct ref *find_ref_by_name(struct ref *list, const char *name)
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{
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for ( ; list; list = list->next)
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if (!strcmp(list->name, name))
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return list;
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return NULL;
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}
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int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
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int nr_refspec, char **refspec, int all)
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{
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struct refspec *rs = parse_ref_spec(nr_refspec, refspec);
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if (nr_refspec)
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return match_explicit_refs(src, dst, dst_tail, rs);
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/* pick the remainder */
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for ( ; src; src = src->next) {
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struct ref *dst_peer;
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if (src->peer_ref)
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continue;
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dst_peer = find_ref_by_name(dst, src->name);
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if ((dst_peer && dst_peer->peer_ref) || (!dst_peer && !all))
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continue;
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if (!dst_peer) {
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/* Create a new one and link it */
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int len = strlen(src->name) + 1;
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dst_peer = xcalloc(1, sizeof(*dst_peer) + len);
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memcpy(dst_peer->name, src->name, len);
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hashcpy(dst_peer->new_sha1, src->new_sha1);
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link_dst_tail(dst_peer, dst_tail);
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}
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dst_peer->peer_ref = src;
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}
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return 0;
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}
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enum protocol {
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PROTO_LOCAL = 1,
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PROTO_SSH,
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PROTO_GIT,
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};
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static enum protocol get_protocol(const char *name)
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{
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if (!strcmp(name, "ssh"))
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return PROTO_SSH;
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if (!strcmp(name, "git"))
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return PROTO_GIT;
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if (!strcmp(name, "git+ssh"))
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return PROTO_SSH;
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if (!strcmp(name, "ssh+git"))
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return PROTO_SSH;
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die("I don't handle protocol '%s'", name);
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}
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#define STR_(s) # s
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#define STR(s) STR_(s)
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#ifndef NO_IPV6
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/*
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* Returns a connected socket() fd, or else die()s.
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*/
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static int git_tcp_connect_sock(char *host)
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{
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int sockfd = -1, saved_errno = 0;
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char *colon, *end;
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const char *port = STR(DEFAULT_GIT_PORT);
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struct addrinfo hints, *ai0, *ai;
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int gai;
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if (host[0] == '[') {
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end = strchr(host + 1, ']');
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if (end) {
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*end = 0;
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end++;
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host++;
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} else
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end = host;
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} else
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end = host;
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colon = strchr(end, ':');
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if (colon) {
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*colon = 0;
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port = colon + 1;
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}
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memset(&hints, 0, sizeof(hints));
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hints.ai_socktype = SOCK_STREAM;
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hints.ai_protocol = IPPROTO_TCP;
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gai = getaddrinfo(host, port, &hints, &ai);
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if (gai)
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die("Unable to look up %s (%s)", host, gai_strerror(gai));
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for (ai0 = ai; ai; ai = ai->ai_next) {
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sockfd = socket(ai->ai_family,
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ai->ai_socktype, ai->ai_protocol);
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if (sockfd < 0) {
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saved_errno = errno;
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continue;
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}
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if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
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saved_errno = errno;
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close(sockfd);
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sockfd = -1;
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continue;
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}
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break;
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}
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freeaddrinfo(ai0);
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if (sockfd < 0)
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die("unable to connect a socket (%s)", strerror(saved_errno));
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return sockfd;
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}
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#else /* NO_IPV6 */
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/*
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* Returns a connected socket() fd, or else die()s.
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*/
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static int git_tcp_connect_sock(char *host)
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{
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int sockfd = -1, saved_errno = 0;
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char *colon, *end;
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char *port = STR(DEFAULT_GIT_PORT), *ep;
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struct hostent *he;
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struct sockaddr_in sa;
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char **ap;
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unsigned int nport;
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if (host[0] == '[') {
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end = strchr(host + 1, ']');
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if (end) {
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*end = 0;
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end++;
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host++;
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} else
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end = host;
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} else
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end = host;
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colon = strchr(end, ':');
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if (colon) {
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*colon = 0;
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port = colon + 1;
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}
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he = gethostbyname(host);
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if (!he)
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die("Unable to look up %s (%s)", host, hstrerror(h_errno));
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nport = strtoul(port, &ep, 10);
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if ( ep == port || *ep ) {
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/* Not numeric */
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struct servent *se = getservbyname(port,"tcp");
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if ( !se )
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die("Unknown port %s\n", port);
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nport = se->s_port;
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}
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for (ap = he->h_addr_list; *ap; ap++) {
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sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
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if (sockfd < 0) {
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saved_errno = errno;
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continue;
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}
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memset(&sa, 0, sizeof sa);
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sa.sin_family = he->h_addrtype;
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sa.sin_port = htons(nport);
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memcpy(&sa.sin_addr, *ap, he->h_length);
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if (connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
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saved_errno = errno;
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close(sockfd);
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sockfd = -1;
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continue;
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}
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break;
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}
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if (sockfd < 0)
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die("unable to connect a socket (%s)", strerror(saved_errno));
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return sockfd;
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}
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#endif /* NO_IPV6 */
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|
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static void git_tcp_connect(int fd[2], char *host)
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{
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int sockfd = git_tcp_connect_sock(host);
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fd[0] = sockfd;
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fd[1] = sockfd;
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}
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|
|
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static char *git_proxy_command;
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static const char *rhost_name;
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static int rhost_len;
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static int git_proxy_command_options(const char *var, const char *value)
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{
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if (!strcmp(var, "core.gitproxy")) {
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const char *for_pos;
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int matchlen = -1;
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int hostlen;
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|
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if (git_proxy_command)
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return 0;
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/* [core]
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* ;# matches www.kernel.org as well
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* gitproxy = netcatter-1 for kernel.org
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* gitproxy = netcatter-2 for sample.xz
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* gitproxy = netcatter-default
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*/
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for_pos = strstr(value, " for ");
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if (!for_pos)
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/* matches everybody */
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matchlen = strlen(value);
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else {
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hostlen = strlen(for_pos + 5);
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if (rhost_len < hostlen)
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matchlen = -1;
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else if (!strncmp(for_pos + 5,
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rhost_name + rhost_len - hostlen,
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hostlen) &&
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((rhost_len == hostlen) ||
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rhost_name[rhost_len - hostlen -1] == '.'))
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matchlen = for_pos - value;
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else
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matchlen = -1;
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}
|
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if (0 <= matchlen) {
|
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/* core.gitproxy = none for kernel.org */
|
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if (matchlen == 4 &&
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!memcmp(value, "none", 4))
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matchlen = 0;
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git_proxy_command = xmalloc(matchlen + 1);
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memcpy(git_proxy_command, value, matchlen);
|
|
git_proxy_command[matchlen] = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
return git_default_config(var, value);
|
|
}
|
|
|
|
static int git_use_proxy(const char *host)
|
|
{
|
|
rhost_name = host;
|
|
rhost_len = strlen(host);
|
|
git_proxy_command = getenv("GIT_PROXY_COMMAND");
|
|
git_config(git_proxy_command_options);
|
|
rhost_name = NULL;
|
|
return (git_proxy_command && *git_proxy_command);
|
|
}
|
|
|
|
static void git_proxy_connect(int fd[2], char *host)
|
|
{
|
|
const char *port = STR(DEFAULT_GIT_PORT);
|
|
char *colon, *end;
|
|
int pipefd[2][2];
|
|
pid_t pid;
|
|
|
|
if (host[0] == '[') {
|
|
end = strchr(host + 1, ']');
|
|
if (end) {
|
|
*end = 0;
|
|
end++;
|
|
host++;
|
|
} else
|
|
end = host;
|
|
} else
|
|
end = host;
|
|
colon = strchr(end, ':');
|
|
|
|
if (colon) {
|
|
*colon = 0;
|
|
port = colon + 1;
|
|
}
|
|
|
|
if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0)
|
|
die("unable to create pipe pair for communication");
|
|
pid = fork();
|
|
if (!pid) {
|
|
dup2(pipefd[1][0], 0);
|
|
dup2(pipefd[0][1], 1);
|
|
close(pipefd[0][0]);
|
|
close(pipefd[0][1]);
|
|
close(pipefd[1][0]);
|
|
close(pipefd[1][1]);
|
|
execlp(git_proxy_command, git_proxy_command, host, port, NULL);
|
|
die("exec failed");
|
|
}
|
|
if (pid < 0)
|
|
die("fork failed");
|
|
fd[0] = pipefd[0][0];
|
|
fd[1] = pipefd[1][1];
|
|
close(pipefd[0][1]);
|
|
close(pipefd[1][0]);
|
|
}
|
|
|
|
/*
|
|
* Yeah, yeah, fixme. Need to pass in the heads etc.
|
|
*/
|
|
int git_connect(int fd[2], char *url, const char *prog)
|
|
{
|
|
char command[1024];
|
|
char *host, *path = url;
|
|
char *end;
|
|
int c;
|
|
int pipefd[2][2];
|
|
pid_t pid;
|
|
enum protocol protocol = PROTO_LOCAL;
|
|
int free_path = 0;
|
|
|
|
/* Without this we cannot rely on waitpid() to tell
|
|
* what happened to our children.
|
|
*/
|
|
signal(SIGCHLD, SIG_DFL);
|
|
|
|
host = strstr(url, "://");
|
|
if(host) {
|
|
*host = '\0';
|
|
protocol = get_protocol(url);
|
|
host += 3;
|
|
c = '/';
|
|
} else {
|
|
host = url;
|
|
c = ':';
|
|
}
|
|
|
|
if (host[0] == '[') {
|
|
end = strchr(host + 1, ']');
|
|
if (end) {
|
|
*end = 0;
|
|
end++;
|
|
host++;
|
|
} else
|
|
end = host;
|
|
} else
|
|
end = host;
|
|
|
|
path = strchr(end, c);
|
|
if (c == ':') {
|
|
if (path) {
|
|
protocol = PROTO_SSH;
|
|
*path++ = '\0';
|
|
} else
|
|
path = host;
|
|
}
|
|
|
|
if (!path || !*path)
|
|
die("No path specified. See 'man git-pull' for valid url syntax");
|
|
|
|
/*
|
|
* null-terminate hostname and point path to ~ for URL's like this:
|
|
* ssh://host.xz/~user/repo
|
|
*/
|
|
if (protocol != PROTO_LOCAL && host != url) {
|
|
char *ptr = path;
|
|
if (path[1] == '~')
|
|
path++;
|
|
else {
|
|
path = xstrdup(ptr);
|
|
free_path = 1;
|
|
}
|
|
|
|
*ptr = '\0';
|
|
}
|
|
|
|
if (protocol == PROTO_GIT) {
|
|
/* These underlying connection commands die() if they
|
|
* cannot connect.
|
|
*/
|
|
char *target_host = xstrdup(host);
|
|
if (git_use_proxy(host))
|
|
git_proxy_connect(fd, host);
|
|
else
|
|
git_tcp_connect(fd, host);
|
|
/*
|
|
* Separate original protocol components prog and path
|
|
* from extended components with a NUL byte.
|
|
*/
|
|
packet_write(fd[1],
|
|
"%s %s%chost=%s%c",
|
|
prog, path, 0,
|
|
target_host, 0);
|
|
free(target_host);
|
|
if (free_path)
|
|
free(path);
|
|
return 0;
|
|
}
|
|
|
|
if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0)
|
|
die("unable to create pipe pair for communication");
|
|
pid = fork();
|
|
if (pid < 0)
|
|
die("unable to fork");
|
|
if (!pid) {
|
|
snprintf(command, sizeof(command), "%s %s", prog,
|
|
sq_quote(path));
|
|
dup2(pipefd[1][0], 0);
|
|
dup2(pipefd[0][1], 1);
|
|
close(pipefd[0][0]);
|
|
close(pipefd[0][1]);
|
|
close(pipefd[1][0]);
|
|
close(pipefd[1][1]);
|
|
if (protocol == PROTO_SSH) {
|
|
const char *ssh, *ssh_basename;
|
|
ssh = getenv("GIT_SSH");
|
|
if (!ssh) ssh = "ssh";
|
|
ssh_basename = strrchr(ssh, '/');
|
|
if (!ssh_basename)
|
|
ssh_basename = ssh;
|
|
else
|
|
ssh_basename++;
|
|
execlp(ssh, ssh_basename, host, command, NULL);
|
|
}
|
|
else {
|
|
unsetenv(ALTERNATE_DB_ENVIRONMENT);
|
|
unsetenv(DB_ENVIRONMENT);
|
|
unsetenv(GIT_DIR_ENVIRONMENT);
|
|
unsetenv(GRAFT_ENVIRONMENT);
|
|
unsetenv(INDEX_ENVIRONMENT);
|
|
execlp("sh", "sh", "-c", command, NULL);
|
|
}
|
|
die("exec failed");
|
|
}
|
|
fd[0] = pipefd[0][0];
|
|
fd[1] = pipefd[1][1];
|
|
close(pipefd[0][1]);
|
|
close(pipefd[1][0]);
|
|
if (free_path)
|
|
free(path);
|
|
return pid;
|
|
}
|
|
|
|
int finish_connect(pid_t pid)
|
|
{
|
|
while (waitpid(pid, NULL, 0) < 0) {
|
|
if (errno != EINTR)
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|