jscoverage/trunk/http-connection.c

/*
    http-connection.c - TCP connection between HTTP client and server
    Copyright (C) 2008 siliconforks.com

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include <config.h>

#include "http-server.h"

#include <assert.h>
#include <errno.h>
#include <string.h>

#include <arpa/inet.h>

#include "util.h"

#define CONNECTION_BUFFER_CAPACITY 8192

struct HTTPConnection {
  SOCKET s;
  uint8_t input_buffer[CONNECTION_BUFFER_CAPACITY];
  size_t input_buffer_offset;
  size_t input_buffer_length;
  uint8_t output_buffer[CONNECTION_BUFFER_CAPACITY];
  size_t output_buffer_offset;
  size_t output_buffer_length;
};

static HTTPConnection * HTTPConnection_new(SOCKET s) {
  HTTPConnection * connection = xmalloc(sizeof(HTTPConnection));
  connection->s = s;
  connection->input_buffer_offset = 0;
  connection->input_buffer_length = 0;
  connection->output_buffer_offset = 0;
  connection->output_buffer_length = 0;
  return connection;
}

HTTPConnection * HTTPConnection_new_client(const char * host, uint16_t port) {
  struct in_addr ip_address;
  if (! inet_aton(host, &ip_address)) {
    /* it's a host name */
    if (xgethostbyname(host, &ip_address) != 0) {
      return NULL;
    }
  }

  SOCKET s = socket(PF_INET, SOCK_STREAM, 0);
  if (s < 0) {
    return NULL;
  }

  struct sockaddr_in a;
  a.sin_family = AF_INET;
  a.sin_port = htons(port);
  a.sin_addr = ip_address;

  if (connect(s, (struct sockaddr *) &a, sizeof(a)) < 0) {
    closesocket(s);
    return NULL;
  }

  return HTTPConnection_new(s);
}

HTTPConnection * HTTPConnection_new_server(SOCKET s) {
  return HTTPConnection_new(s);
}

int HTTPConnection_delete(HTTPConnection * connection) {
  int result = 0;
  if (closesocket(connection->s) == -1) {
    result = errno;
  }
  free(connection);
  return result;
}

int HTTPConnection_get_peer(HTTPConnection * connection, struct sockaddr_in * peer) {
  int result = 0;
  socklen_t length = sizeof(struct sockaddr_in);
  if (getpeername(connection->s, (struct sockaddr *) peer, &length) == -1) {
    result = errno;
  }
  return result;
}

int HTTPConnection_read_octet(HTTPConnection * connection, int * octet) {
  if (connection->input_buffer_offset >= connection->input_buffer_length) {
    ssize_t bytes_received = recv(connection->s, connection->input_buffer, CONNECTION_BUFFER_CAPACITY, 0);
    if (bytes_received == -1) {
      return errno;
    }
    else if (bytes_received == 0) {
      /* orderly shutdown */
      *octet = -1;
      return 0;
    }
    else {
      connection->input_buffer_offset = 0;
      connection->input_buffer_length = bytes_received;
    }
  }
  *octet = connection->input_buffer[connection->input_buffer_offset];
  connection->input_buffer_offset++;
  return 0;
}

int HTTPConnection_peek_octet(HTTPConnection * connection, int * octet) {
  int result = HTTPConnection_read_octet(connection, octet);

  /* check for error */
  if (result != 0) {
    return result;
  }

  /* check for end */
  if (*octet == -1) {
    return 0;
  }

  /* reset input buffer */
  connection->input_buffer_offset--;
  return 0;
}

int HTTPConnection_write(HTTPConnection * connection, const void * p, size_t size) {
  while (size > 0) {
    if (connection->output_buffer_length == CONNECTION_BUFFER_CAPACITY) {
      /* buffer full */
      ssize_t bytes_sent = send(connection->s, connection->output_buffer, CONNECTION_BUFFER_CAPACITY, 0);
      if (bytes_sent == -1) {
        return errno;
      }
      connection->output_buffer_length = 0;
    }

    size_t buffer_remaining = CONNECTION_BUFFER_CAPACITY - connection->output_buffer_length;
    size_t bytes_to_copy;
    if (size <= buffer_remaining) {
      bytes_to_copy = size;
    }
    else {
      bytes_to_copy = buffer_remaining;
    }

    memcpy(connection->output_buffer + connection->output_buffer_length, p, bytes_to_copy);
    connection->output_buffer_length += bytes_to_copy;
    p += bytes_to_copy;
    size -= bytes_to_copy;
  }

  return 0;
}

int HTTPConnection_flush(HTTPConnection * connection) {
  if (connection->output_buffer_length > 0) {
    ssize_t bytes_sent = send(connection->s, connection->output_buffer, connection->output_buffer_length, 0);
    if (bytes_sent == -1) {
      return errno;
    }
    connection->output_buffer_length = 0;
  }
  return 0;
}
1	/*
2	http-connection.c - TCP connection between HTTP client and server
3	Copyright (C) 2008 siliconforks.com
4
5	This program is free software; you can redistribute it and/or modify
6	it under the terms of the GNU General Public License as published by
7	the Free Software Foundation; either version 2 of the License, or
8	(at your option) any later version.
9
10	This program is distributed in the hope that it will be useful,
11	but WITHOUT ANY WARRANTY; without even the implied warranty of
12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13	GNU General Public License for more details.
14
15	You should have received a copy of the GNU General Public License along
16	with this program; if not, write to the Free Software Foundation, Inc.,
17	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18	*/
19
20	#include <config.h>
21
22	#include "http-server.h"
23
24	#include <assert.h>
25	#include <errno.h>
26	#include <string.h>
27
28	#include <arpa/inet.h>
29
30	#include "util.h"
31
32	#define CONNECTION_BUFFER_CAPACITY 8192
33
34	struct HTTPConnection {
35	SOCKET s;
36	uint8_t input_buffer[CONNECTION_BUFFER_CAPACITY];
37	size_t input_buffer_offset;
38	size_t input_buffer_length;
39	uint8_t output_buffer[CONNECTION_BUFFER_CAPACITY];
40	size_t output_buffer_offset;
41	size_t output_buffer_length;
42	};
43
44	static HTTPConnection * HTTPConnection_new(SOCKET s) {
45	HTTPConnection * connection = xmalloc(sizeof(HTTPConnection));
46	connection->s = s;
47	connection->input_buffer_offset = 0;
48	connection->input_buffer_length = 0;
49	connection->output_buffer_offset = 0;
50	connection->output_buffer_length = 0;
51	return connection;
52	}
53
54	HTTPConnection * HTTPConnection_new_client(const char * host, uint16_t port) {
55	struct in_addr ip_address;
56	if (! inet_aton(host, &ip_address)) {
57	/* it's a host name */
58	if (xgethostbyname(host, &ip_address) != 0) {
59	return NULL;
60	}
61	}
62
63	SOCKET s = socket(PF_INET, SOCK_STREAM, 0);
64	if (s < 0) {
65	return NULL;
66	}
67
68	struct sockaddr_in a;
69	a.sin_family = AF_INET;
70	a.sin_port = htons(port);
71	a.sin_addr = ip_address;
72
73	if (connect(s, (struct sockaddr *) &a, sizeof(a)) < 0) {
74	closesocket(s);
75	return NULL;
76	}
77
78	return HTTPConnection_new(s);
79	}
80
81	HTTPConnection * HTTPConnection_new_server(SOCKET s) {
82	return HTTPConnection_new(s);
83	}
84
85	int HTTPConnection_delete(HTTPConnection * connection) {
86	int result = 0;
87	if (closesocket(connection->s) == -1) {
88	result = errno;
89	}
90	free(connection);
91	return result;
92	}
93
94	int HTTPConnection_get_peer(HTTPConnection * connection, struct sockaddr_in * peer) {
95	int result = 0;
96	socklen_t length = sizeof(struct sockaddr_in);
97	if (getpeername(connection->s, (struct sockaddr *) peer, &length) == -1) {
98	result = errno;
99	}
100	return result;
101	}
102
103	int HTTPConnection_read_octet(HTTPConnection * connection, int * octet) {
104	if (connection->input_buffer_offset >= connection->input_buffer_length) {
105	ssize_t bytes_received = recv(connection->s, connection->input_buffer, CONNECTION_BUFFER_CAPACITY, 0);
106	if (bytes_received == -1) {
107	return errno;
108	}
109	else if (bytes_received == 0) {
110	/* orderly shutdown */
111	*octet = -1;
112	return 0;
113	}
114	else {
115	connection->input_buffer_offset = 0;
116	connection->input_buffer_length = bytes_received;
117	}
118	}
119	*octet = connection->input_buffer[connection->input_buffer_offset];
120	connection->input_buffer_offset++;
121	return 0;
122	}
123
124	int HTTPConnection_peek_octet(HTTPConnection * connection, int * octet) {
125	int result = HTTPConnection_read_octet(connection, octet);
126
127	/* check for error */
128	if (result != 0) {
129	return result;
130	}
131
132	/* check for end */
133	if (*octet == -1) {
134	return 0;
135	}
136
137	/* reset input buffer */
138	connection->input_buffer_offset--;
139	return 0;
140	}
141
142	int HTTPConnection_write(HTTPConnection * connection, const void * p, size_t size) {
143	while (size > 0) {
144	if (connection->output_buffer_length == CONNECTION_BUFFER_CAPACITY) {
145	/* buffer full */
146	ssize_t bytes_sent = send(connection->s, connection->output_buffer, CONNECTION_BUFFER_CAPACITY, 0);
147	if (bytes_sent == -1) {
148	return errno;
149	}
150	connection->output_buffer_length = 0;
151	}
152
153	size_t buffer_remaining = CONNECTION_BUFFER_CAPACITY - connection->output_buffer_length;
154	size_t bytes_to_copy;
155	if (size <= buffer_remaining) {
156	bytes_to_copy = size;
157	}
158	else {
159	bytes_to_copy = buffer_remaining;
160	}
161
162	memcpy(connection->output_buffer + connection->output_buffer_length, p, bytes_to_copy);
163	connection->output_buffer_length += bytes_to_copy;
164	p += bytes_to_copy;
165	size -= bytes_to_copy;
166	}
167
168	return 0;
169	}
170
171	int HTTPConnection_flush(HTTPConnection * connection) {
172	if (connection->output_buffer_length > 0) {
173	ssize_t bytes_sent = send(connection->s, connection->output_buffer, connection->output_buffer_length, 0);
174	if (bytes_sent == -1) {
175	return errno;
176	}
177	connection->output_buffer_length = 0;
178	}
179	return 0;
180	}