thodg/libgit2/src/netops.c

• Show log

  Commit

• Hash : f7597410
  Author :
  Date : 2019-05-21T10:57:30
  

  netops: safely cast to int Only read at most INT_MAX from the underlying stream, so that we can accurately return the number of bytes read. Since callers are not guaranteed to get as many bytes as requested (due to availability of input), this is safe and callers should call in a loop until EOF.

Download

• src/netops.c

• /*
   * Copyright (C) the libgit2 contributors. All rights reserved.
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  
  #include "netops.h"
  
  #include <ctype.h>
  #include "git2/errors.h"
  
  #include "posix.h"
  #include "buffer.h"
  #include "http_parser.h"
  #include "global.h"
  
  int gitno_recv(gitno_buffer *buf)
  {
  	return buf->recv(buf);
  }
  
  void gitno_buffer_setup_callback(
  	gitno_buffer *buf,
  	char *data,
  	size_t len,
  	int (*recv)(gitno_buffer *buf), void *cb_data)
  {
  	memset(data, 0x0, len);
  	buf->data = data;
  	buf->len = len;
  	buf->offset = 0;
  	buf->recv = recv;
  	buf->cb_data = cb_data;
  }
  
  static int recv_stream(gitno_buffer *buf)
  {
  	git_stream *io = (git_stream *) buf->cb_data;
  	size_t readlen = buf->len - buf->offset;
  	ssize_t ret;
  
  	readlen = min(readlen, INT_MAX);
  
  	ret = git_stream_read(io, buf->data + buf->offset, (int)readlen);
  	if (ret < 0)
  		return -1;
  
  	buf->offset += ret;
  	return (int)ret;
  }
  
  void gitno_buffer_setup_fromstream(git_stream *st, gitno_buffer *buf, char *data, size_t len)
  {
  	memset(data, 0x0, len);
  	buf->data = data;
  	buf->len = len;
  	buf->offset = 0;
  	buf->recv = recv_stream;
  	buf->cb_data = st;
  }
  
  /* Consume up to ptr and move the rest of the buffer to the beginning */
  void gitno_consume(gitno_buffer *buf, const char *ptr)
  {
  	size_t consumed;
  
  	assert(ptr - buf->data >= 0);
  	assert(ptr - buf->data <= (int) buf->len);
  
  	consumed = ptr - buf->data;
  
  	memmove(buf->data, ptr, buf->offset - consumed);
  	memset(buf->data + buf->offset, 0x0, buf->len - buf->offset);
  	buf->offset -= consumed;
  }
  
  /* Consume const bytes and move the rest of the buffer to the beginning */
  void gitno_consume_n(gitno_buffer *buf, size_t cons)
  {
  	memmove(buf->data, buf->data + cons, buf->len - buf->offset);
  	memset(buf->data + cons, 0x0, buf->len - buf->offset);
  	buf->offset -= cons;
  }
  
  /* Match host names according to RFC 2818 rules */
  int gitno__match_host(const char *pattern, const char *host)
  {
  	for (;;) {
  		char c = git__tolower(*pattern++);
  
  		if (c == '\0')
  			return *host ? -1 : 0;
  
  		if (c == '*') {
  			c = *pattern;
  			/* '*' at the end matches everything left */
  			if (c == '\0')
  				return 0;
  
  	/*
  	 * We've found a pattern, so move towards the next matching
  	 * char. The '.' is handled specially because wildcards aren't
  	 * allowed to cross subdomains.
  	 */
  
  			while(*host) {
  				char h = git__tolower(*host);
  				if (c == h)
  					return gitno__match_host(pattern, host++);
  				if (h == '.')
  					return gitno__match_host(pattern, host);
  				host++;
  			}
  			return -1;
  		}
  
  		if (c != git__tolower(*host++))
  			return -1;
  	}
  
  	return -1;
  }
  
  int gitno_connection_data_handle_redirect(
  		git_net_url *url,
  		const char *redirect_str,
  		const char *service_suffix)
  {
  	git_net_url tmp = GIT_NET_URL_INIT;
  	int error = 0;
  
  	assert(url && redirect_str);
  
  	if (redirect_str[0] == '/') {
  		git__free(url->path);
  
  		if ((url->path = git__strdup(redirect_str)) == NULL) {
  			error = -1;
  			goto done;
  		}
  	} else {
  		git_net_url *original = url;
  
  		if ((error = git_net_url_parse(&tmp, redirect_str)) < 0)
  			goto done;
  
  		/* Validate that this is a legal redirection */
  
  		if (original->scheme &&
  		    strcmp(original->scheme, tmp.scheme) != 0 &&
  			strcmp(tmp.scheme, "https") != 0) {
  			git_error_set(GIT_ERROR_NET, "cannot redirect from '%s' to '%s'",
  				original->scheme, tmp.scheme);
  
  			error = -1;
  			goto done;
  		}
  
  		if (original->host &&
  		    git__strcasecmp(original->host, tmp.host) != 0) {
  			git_error_set(GIT_ERROR_NET, "cannot redirect from '%s' to '%s'",
  				original->host, tmp.host);
  
  			error = -1;
  			goto done;
  		}
  
  		git_net_url_swap(url, &tmp);
  	}
  
  	/* Remove the service suffix if it was given to us */
  	if (service_suffix) {
  		const char *service_query = strchr(service_suffix, '?');
  		size_t suffix_len = service_query ?
  			(size_t)(service_query - service_suffix) : strlen(service_suffix);
  		size_t path_len = strlen(url->path);
  
  		if (suffix_len && path_len >= suffix_len) {
  			size_t suffix_offset = path_len - suffix_len;
  
  			if (git__strncmp(url->path + suffix_offset, service_suffix, suffix_len) == 0 &&
  			    (!service_query || git__strcmp(url->query, service_query + 1) == 0)) {
  				/* Ensure we leave a minimum of '/' as the path */
  				if (suffix_offset == 0)
  					suffix_offset++;
  
  				url->path[suffix_offset] = '\0';
  
  				git__free(url->query);
  				url->query = NULL;
  			}
  		}
  	}
  
  done:
  	git_net_url_dispose(&tmp);
  	return error;
  }
  
  

Download