+/*
+ * Copyright (C) 1995-2007, Index Data ApS
+ * See the file LICENSE for details.
+ *
+ * $Id: http.c,v 1.1 2007-01-11 10:55:57 adam Exp $
+ */
+
+/**
+ * \file http.c
+ * \brief Implements HTTP decoding
+ */
+
+#include <ctype.h>
+#include <yaz/odr.h>
+#include <yaz/yaz-version.h>
+#include <yaz/yaz-iconv.h>
+#include <yaz/zgdu.h>
+
+#ifdef WIN32
+#define strncasecmp _strnicmp
+#define strcasecmp _stricmp
+#endif
+
+static int decode_headers_content(ODR o, int off, Z_HTTP_Header **headers,
+ char **content_buf, int *content_len)
+{
+ int i = off;
+ int chunked = 0;
+
+ *headers = 0;
+ while (i < o->size-1 && o->buf[i] == '\n')
+ {
+ int po;
+ i++;
+ if (o->buf[i] == '\r' && i < o->size-1 && o->buf[i+1] == '\n')
+ {
+ i++;
+ break;
+ }
+ if (o->buf[i] == '\n')
+ break;
+ for (po = i; ; i++)
+ {
+ if (i == o->size)
+ {
+ o->error = OHTTP;
+ return 0;
+ }
+ else if (o->buf[i] == ':')
+ break;
+ }
+ *headers = (Z_HTTP_Header *) odr_malloc(o, sizeof(**headers));
+ (*headers)->name = (char*) odr_malloc(o, i - po + 1);
+ memcpy ((*headers)->name, o->buf + po, i - po);
+ (*headers)->name[i - po] = '\0';
+ i++;
+ while (i < o->size-1 && o->buf[i] == ' ')
+ i++;
+ for (po = i; i < o->size-1 && !strchr("\r\n", o->buf[i]); i++)
+ ;
+
+ (*headers)->value = (char*) odr_malloc(o, i - po + 1);
+ memcpy ((*headers)->value, o->buf + po, i - po);
+ (*headers)->value[i - po] = '\0';
+
+ if (!strcasecmp((*headers)->name, "Transfer-Encoding")
+ &&
+ !strcasecmp((*headers)->value, "chunked"))
+ chunked = 1;
+ headers = &(*headers)->next;
+ if (i < o->size-1 && o->buf[i] == '\r')
+ i++;
+ }
+ *headers = 0;
+ if (o->buf[i] != '\n')
+ {
+ o->error = OHTTP;
+ return 0;
+ }
+ i++;
+
+ if (chunked)
+ {
+ int off = 0;
+
+ /* we know buffer will be smaller than o->size - i*/
+ *content_buf = (char*) odr_malloc(o, o->size - i);
+
+ while (1)
+ {
+ /* chunk length .. */
+ int chunk_len = 0;
+ for (; i < o->size-2; i++)
+ if (isdigit(o->buf[i]))
+ chunk_len = chunk_len * 16 +
+ (o->buf[i] - '0');
+ else if (isupper(o->buf[i]))
+ chunk_len = chunk_len * 16 +
+ (o->buf[i] - ('A'-10));
+ else if (islower(o->buf[i]))
+ chunk_len = chunk_len * 16 +
+ (o->buf[i] - ('a'-10));
+ else
+ break;
+ /* chunk extension ... */
+ while (o->buf[i] != '\r' && o->buf[i+1] != '\n')
+ {
+ if (i >= o->size-2)
+ {
+ o->error = OHTTP;
+ return 0;
+ }
+ i++;
+ }
+ i += 2; /* skip CRLF */
+ if (chunk_len == 0)
+ break;
+ if (chunk_len < 0 || off + chunk_len > o->size)
+ {
+ o->error = OHTTP;
+ return 0;
+ }
+ /* copy chunk .. */
+ memcpy (*content_buf + off, o->buf + i, chunk_len);
+ i += chunk_len + 2; /* skip chunk+CRLF */
+ off += chunk_len;
+ }
+ if (!off)
+ *content_buf = 0;
+ *content_len = off;
+ }
+ else
+ {
+ if (i > o->size)
+ {
+ o->error = OHTTP;
+ return 0;
+ }
+ else if (i == o->size)
+ {
+ *content_buf = 0;
+ *content_len = 0;
+ }
+ else
+ {
+ *content_len = o->size - i;
+ *content_buf = (char*) odr_malloc(o, *content_len + 1);
+ memcpy(*content_buf, o->buf + i, *content_len);
+ (*content_buf)[*content_len] = '\0';
+ }
+ }
+ return 1;
+}
+
+void z_HTTP_header_add_content_type(ODR o, Z_HTTP_Header **hp,
+ const char *content_type,
+ const char *charset)
+{
+ const char *l = "Content-Type";
+ if (charset)
+ {
+ char *ctype = odr_malloc(o, strlen(content_type)+strlen(charset) + 15);
+ sprintf(ctype, "%s; charset=%s", content_type, charset);
+ z_HTTP_header_add(o, hp, l, ctype);
+ }
+ else
+ z_HTTP_header_add(o, hp, l, content_type);
+
+}
+
+void z_HTTP_header_add(ODR o, Z_HTTP_Header **hp, const char *n,
+ const char *v)
+{
+ while (*hp)
+ hp = &(*hp)->next;
+ *hp = (Z_HTTP_Header *) odr_malloc(o, sizeof(**hp));
+ (*hp)->name = odr_strdup(o, n);
+ (*hp)->value = odr_strdup(o, v);
+ (*hp)->next = 0;
+}
+
+const char *z_HTTP_header_lookup(const Z_HTTP_Header *hp, const char *n)
+{
+ for (; hp; hp = hp->next)
+ if (!yaz_matchstr(hp->name, n))
+ return hp->value;
+ return 0;
+}
+
+
+Z_GDU *z_get_HTTP_Request(ODR o)
+{
+ Z_GDU *p = (Z_GDU *) odr_malloc(o, sizeof(*p));
+ Z_HTTP_Request *hreq;
+
+ p->which = Z_GDU_HTTP_Request;
+ p->u.HTTP_Request = (Z_HTTP_Request *) odr_malloc(o, sizeof(*hreq));
+ hreq = p->u.HTTP_Request;
+ hreq->headers = 0;
+ hreq->content_len = 0;
+ hreq->content_buf = 0;
+ hreq->version = "1.1";
+ hreq->method = "POST";
+ hreq->path = "/";
+ z_HTTP_header_add(o, &hreq->headers, "User-Agent", "YAZ/" YAZ_VERSION);
+ return p;
+}
+
+
+Z_GDU *z_get_HTTP_Request_host_path(ODR odr,
+ const char *host,
+ const char *path)
+{
+ Z_GDU *p = z_get_HTTP_Request(odr);
+
+ p->u.HTTP_Request->path = odr_strdup(odr, path);
+
+ if (host)
+ {
+ const char *cp0 = strstr(host, "://");
+ const char *cp1 = 0;
+ if (cp0)
+ cp0 = cp0+3;
+ else
+ cp0 = host;
+
+ cp1 = strchr(cp0, '/');
+ if (!cp1)
+ cp1 = cp0+strlen(cp0);
+
+ if (cp0 && cp1)
+ {
+ char *h = (char*) odr_malloc(odr, cp1 - cp0 + 1);
+ memcpy (h, cp0, cp1 - cp0);
+ h[cp1-cp0] = '\0';
+ z_HTTP_header_add(odr, &p->u.HTTP_Request->headers,
+ "Host", h);
+ }
+ }
+ return p;
+}
+
+
+Z_GDU *z_get_HTTP_Response(ODR o, int code)
+{
+ Z_GDU *p = (Z_GDU *) odr_malloc(o, sizeof(*p));
+ Z_HTTP_Response *hres;
+
+ p->which = Z_GDU_HTTP_Response;
+ p->u.HTTP_Response = (Z_HTTP_Response *) odr_malloc(o, sizeof(*hres));
+ hres = p->u.HTTP_Response;
+ hres->headers = 0;
+ hres->content_len = 0;
+ hres->content_buf = 0;
+ hres->code = code;
+ hres->version = "1.1";
+ z_HTTP_header_add(o, &hres->headers, "Server",
+ "YAZ/" YAZ_VERSION);
+ if (code != 200)
+ {
+ hres->content_buf = (char*) odr_malloc(o, 400);
+ sprintf (hres->content_buf,
+ "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n"
+ "<HTML>\n"
+ " <HEAD>\n"
+ " <TITLE>YAZ " YAZ_VERSION "</TITLE>\n"
+ " </HEAD>\n"
+ " <BODY>\n"
+ " <P><A HREF=\"http://www.indexdata.dk/yaz/\">YAZ</A> "
+ YAZ_VERSION "</P>\n"
+ " <P>Error: %d</P>\n"
+ " <P>Description: %.50s</P>\n"
+ " </BODY>\n"
+ "</HTML>\n",
+ code, z_HTTP_errmsg(code));
+ hres->content_len = strlen(hres->content_buf);
+ z_HTTP_header_add(o, &hres->headers, "Content-Type", "text/html");
+ }
+ return p;
+}
+
+const char *z_HTTP_errmsg(int code)
+{
+ if (code == 200)
+ return "OK";
+ else if (code == 400)
+ return "Bad Request";
+ else if (code == 404)
+ return "Not Found";
+ else if (code == 405)
+ return "Method Not Allowed";
+ else if (code == 500)
+ return "Internal Error";
+ else
+ return "Unknown Error";
+}
+
+int yaz_decode_http_response(ODR o, Z_HTTP_Response **hr_p)
+{
+ int i, po;
+ Z_HTTP_Response *hr = (Z_HTTP_Response *) odr_malloc(o, sizeof(*hr));
+
+ *hr_p = hr;
+ hr->content_buf = 0;
+ hr->content_len = 0;
+
+ po = i = 5;
+ while (i < o->size-2 && !strchr(" \r\n", o->buf[i]))
+ i++;
+ hr->version = (char *) odr_malloc(o, i - po + 1);
+ if (i - po)
+ memcpy(hr->version, o->buf + po, i - po);
+ hr->version[i-po] = 0;
+ if (o->buf[i] != ' ')
+ {
+ o->error = OHTTP;
+ return 0;
+ }
+ i++;
+ hr->code = 0;
+ while (i < o->size-2 && o->buf[i] >= '0' && o->buf[i] <= '9')
+ {
+ hr->code = hr->code*10 + (o->buf[i] - '0');
+ i++;
+ }
+ while (i < o->size-1 && o->buf[i] != '\n')
+ i++;
+ return decode_headers_content(o, i, &hr->headers,
+ &hr->content_buf, &hr->content_len);
+}
+
+int yaz_decode_http_request(ODR o, Z_HTTP_Request **hr_p)
+{
+ int i, po;
+ Z_HTTP_Request *hr = (Z_HTTP_Request *) odr_malloc(o, sizeof(*hr));
+
+ *hr_p = hr;
+
+ /* method .. */
+ for (i = 0; o->buf[i] != ' '; i++)
+ if (i >= o->size-5 || i > 30)
+ {
+ o->error = OHTTP;
+ return 0;
+ }
+ hr->method = (char *) odr_malloc(o, i+1);
+ memcpy (hr->method, o->buf, i);
+ hr->method[i] = '\0';
+ /* path */
+ po = i+1;
+ for (i = po; o->buf[i] != ' '; i++)
+ if (i >= o->size-5)
+ {
+ o->error = OHTTP;
+ return 0;
+ }
+ hr->path = (char *) odr_malloc(o, i - po + 1);
+ memcpy (hr->path, o->buf+po, i - po);
+ hr->path[i - po] = '\0';
+ /* HTTP version */
+ i++;
+ if (i > o->size-5 || memcmp(o->buf+i, "HTTP/", 5))
+ {
+ o->error = OHTTP;
+ return 0;
+ }
+ i+= 5;
+ po = i;
+ while (i < o->size && !strchr("\r\n", o->buf[i]))
+ i++;
+ hr->version = (char *) odr_malloc(o, i - po + 1);
+ memcpy(hr->version, o->buf + po, i - po);
+ hr->version[i - po] = '\0';
+ /* headers */
+ if (i < o->size-1 && o->buf[i] == '\r')
+ i++;
+ if (o->buf[i] != '\n')
+ {
+ o->error = OHTTP;
+ return 0;
+ }
+ return decode_headers_content(o, i, &hr->headers,
+ &hr->content_buf, &hr->content_len);
+}
+
+int yaz_encode_http_response(ODR o, Z_HTTP_Response *hr)
+{
+ char sbuf[80];
+ Z_HTTP_Header *h;
+ int top0 = o->top;
+
+ sprintf(sbuf, "HTTP/%s %d %s\r\n", hr->version,
+ hr->code,
+ z_HTTP_errmsg(hr->code));
+ odr_write(o, (unsigned char *) sbuf, strlen(sbuf));
+ /* apply Content-Length if not already applied */
+ if (!z_HTTP_header_lookup(hr->headers,
+ "Content-Length"))
+ {
+ char lstr[60];
+ sprintf(lstr, "Content-Length: %d\r\n",
+ hr->content_len);
+ odr_write(o, (unsigned char *) lstr, strlen(lstr));
+ }
+ for (h = hr->headers; h; h = h->next)
+ {
+ odr_write(o, (unsigned char *) h->name, strlen(h->name));
+ odr_write(o, (unsigned char *) ": ", 2);
+ odr_write(o, (unsigned char *) h->value, strlen(h->value));
+ odr_write(o, (unsigned char *) "\r\n", 2);
+ }
+ odr_write(o, (unsigned char *) "\r\n", 2);
+ if (hr->content_buf)
+ odr_write(o, (unsigned char *)
+ hr->content_buf,
+ hr->content_len);
+ if (o->direction == ODR_PRINT)
+ {
+ odr_printf(o, "-- HTTP response:\n%.*s\n", o->top - top0,
+ o->buf + top0);
+ odr_printf(o, "-- \n");
+ }
+ return 1;
+}
+
+int yaz_encode_http_request(ODR o, Z_HTTP_Request *hr)
+{
+ Z_HTTP_Header *h;
+ int top0 = o->top;
+
+ odr_write(o, (unsigned char *) hr->method,
+ strlen(hr->method));
+ odr_write(o, (unsigned char *) " ", 1);
+ odr_write(o, (unsigned char *) hr->path,
+ strlen(hr->path));
+ odr_write(o, (unsigned char *) " HTTP/", 6);
+ odr_write(o, (unsigned char *) hr->version,
+ strlen(hr->version));
+ odr_write(o, (unsigned char *) "\r\n", 2);
+ if (hr->content_len &&
+ !z_HTTP_header_lookup(hr->headers,
+ "Content-Length"))
+ {
+ char lstr[60];
+ sprintf(lstr, "Content-Length: %d\r\n",
+ hr->content_len);
+ odr_write(o, (unsigned char *) lstr, strlen(lstr));
+ }
+ for (h = hr->headers; h; h = h->next)
+ {
+ odr_write(o, (unsigned char *) h->name, strlen(h->name));
+ odr_write(o, (unsigned char *) ": ", 2);
+ odr_write(o, (unsigned char *) h->value, strlen(h->value));
+ odr_write(o, (unsigned char *) "\r\n", 2);
+ }
+ odr_write(o, (unsigned char *) "\r\n", 2);
+ if (hr->content_buf)
+ odr_write(o, (unsigned char *)
+ hr->content_buf,
+ hr->content_len);
+ if (o->direction == ODR_PRINT)
+ {
+ odr_printf(o, "-- HTTP request:\n%.*s\n", o->top - top0,
+ o->buf + top0);
+ odr_printf(o, "-- \n");
+ }
+ return 1;
+}
+
+/*
+ * Local variables:
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ * vim: shiftwidth=4 tabstop=8 expandtab
+ */
+