Revert changes relative to lib/*.[ch] recent renaming

This reverts renaming and usage of lib/*.h header files done
28-12-2012, reverting 2 commits:

  f871de0... build: make use of 76 lib/*.h renamed files
  ffd8e12... build: rename 76 lib/*.h files

This also reverts removal of redundant include guard (redundant thanks
to changes in above commits) done 2-12-2013, reverting 1 commit:

  c087374... curl_setup.h: remove redundant include guard

This also reverts renaming and usage of lib/*.c source files done
3-12-2013, reverting 3 commits:

  13606bb... build: make use of 93 lib/*.c renamed files
  5b6e792... build: rename 93 lib/*.c files
  7d83dff... build: commit 13606bbfde follow-up 1

Start of related discussion thread:

  http://curl.haxx.se/mail/lib-2013-01/0012.html

Asking for confirmation on pushing this revertion commit:

  http://curl.haxx.se/mail/lib-2013-01/0048.html

Confirmation summary:

  http://curl.haxx.se/mail/lib-2013-01/0079.html

NOTICE: The list of 2 files that have been modified by other
intermixed commits, while renamed, and also by at least one
of the 6 commits this one reverts follows below. These 2 files
will exhibit a hole in history unless git's '--follow' option
is used when viewing logs.

  lib/curl_imap.h
  lib/curl_smtp.h

1 files changed, 583 insertions, 0 deletions

diff --git a/lib/http_digest.c b/lib/http_digest.c
new file mode 100644
index 000000000..17cc95e81
--- /dev/null
+++ b/lib/http_digest.c
@@ -0,0 +1,583 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2012, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at http://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+
+#include "setup.h"
+
+#if !defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_CRYPTO_AUTH)
+
+#include "urldata.h"
+#include "sendf.h"
+#include "rawstr.h"
+#include "curl_base64.h"
+#include "curl_md5.h"
+#include "http_digest.h"
+#include "strtok.h"
+#include "url.h" /* for Curl_safefree() */
+#include "curl_memory.h"
+#include "non-ascii.h" /* included for Curl_convert_... prototypes */
+#include "warnless.h"
+
+#define _MPRINTF_REPLACE /* use our functions only */
+#include <curl/mprintf.h>
+
+/* The last #include file should be: */
+#include "memdebug.h"
+
+#define MAX_VALUE_LENGTH 256
+#define MAX_CONTENT_LENGTH 1024
+
+static void digest_cleanup_one(struct digestdata *dig);
+
+/*
+ * Return 0 on success and then the buffers are filled in fine.
+ *
+ * Non-zero means failure to parse.
+ */
+static int get_pair(const char *str, char *value, char *content,
+                    const char **endptr)
+{
+  int c;
+  bool starts_with_quote = FALSE;
+  bool escape = FALSE;
+
+  for(c=MAX_VALUE_LENGTH-1; (*str && (*str != '=') && c--); )
+    *value++ = *str++;
+  *value=0;
+
+  if('=' != *str++)
+    /* eek, no match */
+    return 1;
+
+  if('\"' == *str) {
+    /* this starts with a quote so it must end with one as well! */
+    str++;
+    starts_with_quote = TRUE;
+  }
+
+  for(c=MAX_CONTENT_LENGTH-1; *str && c--; str++) {
+    switch(*str) {
+    case '\\':
+      if(!escape) {
+        /* possibly the start of an escaped quote */
+        escape = TRUE;
+        *content++ = '\\'; /* even though this is an escape character, we still
+                              store it as-is in the target buffer */
+        continue;
+      }
+      break;
+    case ',':
+      if(!starts_with_quote) {
+        /* this signals the end of the content if we didn't get a starting
+           quote and then we do "sloppy" parsing */
+        c=0; /* the end */
+        continue;
+      }
+      break;
+    case '\r':
+    case '\n':
+      /* end of string */
+      c=0;
+      continue;
+    case '\"':
+      if(!escape && starts_with_quote) {
+        /* end of string */
+        c=0;
+        continue;
+      }
+      break;
+    }
+    escape = FALSE;
+    *content++ = *str;
+  }
+  *content=0;
+
+  *endptr = str;
+
+  return 0; /* all is fine! */
+}
+
+/* Test example headers:
+
+WWW-Authenticate: Digest realm="testrealm", nonce="1053604598"
+Proxy-Authenticate: Digest realm="testrealm", nonce="1053604598"
+
+*/
+
+CURLdigest Curl_input_digest(struct connectdata *conn,
+                             bool proxy,
+                             const char *header) /* rest of the *-authenticate:
+                                                    header */
+{
+  char *token = NULL;
+  char *tmp = NULL;
+  bool foundAuth = FALSE;
+  bool foundAuthInt = FALSE;
+  struct SessionHandle *data=conn->data;
+  bool before = FALSE; /* got a nonce before */
+  struct digestdata *d;
+
+  if(proxy) {
+    d = &data->state.proxydigest;
+  }
+  else {
+    d = &data->state.digest;
+  }
+
+  /* skip initial whitespaces */
+  while(*header && ISSPACE(*header))
+    header++;
+
+  if(checkprefix("Digest", header)) {
+    header += strlen("Digest");
+
+    /* If we already have received a nonce, keep that in mind */
+    if(d->nonce)
+      before = TRUE;
+
+    /* clear off any former leftovers and init to defaults */
+    digest_cleanup_one(d);
+
+    for(;;) {
+      char value[MAX_VALUE_LENGTH];
+      char content[MAX_CONTENT_LENGTH];
+
+      while(*header && ISSPACE(*header))
+        header++;
+
+      /* extract a value=content pair */
+      if(!get_pair(header, value, content, &header)) {
+        if(Curl_raw_equal(value, "nonce")) {
+          d->nonce = strdup(content);
+          if(!d->nonce)
+            return CURLDIGEST_NOMEM;
+        }
+        else if(Curl_raw_equal(value, "stale")) {
+          if(Curl_raw_equal(content, "true")) {
+            d->stale = TRUE;
+            d->nc = 1; /* we make a new nonce now */
+          }
+        }
+        else if(Curl_raw_equal(value, "realm")) {
+          d->realm = strdup(content);
+          if(!d->realm)
+            return CURLDIGEST_NOMEM;
+        }
+        else if(Curl_raw_equal(value, "opaque")) {
+          d->opaque = strdup(content);
+          if(!d->opaque)
+            return CURLDIGEST_NOMEM;
+        }
+        else if(Curl_raw_equal(value, "qop")) {
+          char *tok_buf;
+          /* tokenize the list and choose auth if possible, use a temporary
+             clone of the buffer since strtok_r() ruins it */
+          tmp = strdup(content);
+          if(!tmp)
+            return CURLDIGEST_NOMEM;
+          token = strtok_r(tmp, ",", &tok_buf);
+          while(token != NULL) {
+            if(Curl_raw_equal(token, "auth")) {
+              foundAuth = TRUE;
+            }
+            else if(Curl_raw_equal(token, "auth-int")) {
+              foundAuthInt = TRUE;
+            }
+            token = strtok_r(NULL, ",", &tok_buf);
+          }
+          free(tmp);
+          /*select only auth o auth-int. Otherwise, ignore*/
+          if(foundAuth) {
+            d->qop = strdup("auth");
+            if(!d->qop)
+              return CURLDIGEST_NOMEM;
+          }
+          else if(foundAuthInt) {
+            d->qop = strdup("auth-int");
+            if(!d->qop)
+              return CURLDIGEST_NOMEM;
+          }
+        }
+        else if(Curl_raw_equal(value, "algorithm")) {
+          d->algorithm = strdup(content);
+          if(!d->algorithm)
+            return CURLDIGEST_NOMEM;
+          if(Curl_raw_equal(content, "MD5-sess"))
+            d->algo = CURLDIGESTALGO_MD5SESS;
+          else if(Curl_raw_equal(content, "MD5"))
+            d->algo = CURLDIGESTALGO_MD5;
+          else
+            return CURLDIGEST_BADALGO;
+        }
+        else {
+          /* unknown specifier, ignore it! */
+        }
+      }
+      else
+        break; /* we're done here */
+
+      /* pass all additional spaces here */
+      while(*header && ISSPACE(*header))
+        header++;
+      if(',' == *header)
+        /* allow the list to be comma-separated */
+        header++;
+    }
+    /* We had a nonce since before, and we got another one now without
+       'stale=true'. This means we provided bad credentials in the previous
+       request */
+    if(before && !d->stale)
+      return CURLDIGEST_BAD;
+
+    /* We got this header without a nonce, that's a bad Digest line! */
+    if(!d->nonce)
+      return CURLDIGEST_BAD;
+  }
+  else
+    /* else not a digest, get out */
+    return CURLDIGEST_NONE;
+
+  return CURLDIGEST_FINE;
+}
+
+/* convert md5 chunk to RFC2617 (section 3.1.3) -suitable ascii string*/
+static void md5_to_ascii(unsigned char *source, /* 16 bytes */
+                         unsigned char *dest) /* 33 bytes */
+{
+  int i;
+  for(i=0; i<16; i++)
+    snprintf((char *)&dest[i*2], 3, "%02x", source[i]);
+}
+
+CURLcode Curl_output_digest(struct connectdata *conn,
+                            bool proxy,
+                            const unsigned char *request,
+                            const unsigned char *uripath)
+{
+  /* We have a Digest setup for this, use it!  Now, to get all the details for
+     this sorted out, I must urge you dear friend to read up on the RFC2617
+     section 3.2.2, */
+  unsigned char md5buf[16]; /* 16 bytes/128 bits */
+  unsigned char request_digest[33];
+  unsigned char *md5this;
+  unsigned char *ha1;
+  unsigned char ha2[33];/* 32 digits and 1 zero byte */
+  char cnoncebuf[33];
+  char *cnonce = NULL;
+  size_t cnonce_sz = 0;
+  char *tmp = NULL;
+  struct timeval now;
+
+  char **allocuserpwd;
+  const char *userp;
+  const char *passwdp;
+  struct auth *authp;
+
+  struct SessionHandle *data = conn->data;
+  struct digestdata *d;
+  CURLcode rc;
+/* The CURL_OUTPUT_DIGEST_CONV macro below is for non-ASCII machines.
+   It converts digest text to ASCII so the MD5 will be correct for
+   what ultimately goes over the network.
+*/
+#define CURL_OUTPUT_DIGEST_CONV(a, b) \
+  rc = Curl_convert_to_network(a, (char *)b, strlen((const char*)b)); \
+  if(rc != CURLE_OK) { \
+    free(b); \
+    return rc; \
+  }
+
+  if(proxy) {
+    d = &data->state.proxydigest;
+    allocuserpwd = &conn->allocptr.proxyuserpwd;
+    userp = conn->proxyuser;
+    passwdp = conn->proxypasswd;
+    authp = &data->state.authproxy;
+  }
+  else {
+    d = &data->state.digest;
+    allocuserpwd = &conn->allocptr.userpwd;
+    userp = conn->user;
+    passwdp = conn->passwd;
+    authp = &data->state.authhost;
+  }
+
+  if(*allocuserpwd) {
+    Curl_safefree(*allocuserpwd);
+    *allocuserpwd = NULL;
+  }
+
+  /* not set means empty */
+  if(!userp)
+    userp="";
+
+  if(!passwdp)
+    passwdp="";
+
+  if(!d->nonce) {
+    authp->done = FALSE;
+    return CURLE_OK;
+  }
+  authp->done = TRUE;
+
+  if(!d->nc)
+    d->nc = 1;
+
+  if(!d->cnonce) {
+    /* Generate a cnonce */
+    now = Curl_tvnow();
+    snprintf(cnoncebuf, sizeof(cnoncebuf), "%32ld",
+             (long)now.tv_sec + now.tv_usec);
+
+    rc = Curl_base64_encode(data, cnoncebuf, strlen(cnoncebuf),
+                            &cnonce, &cnonce_sz);
+    if(rc)
+      return rc;
+    d->cnonce = cnonce;
+  }
+
+  /*
+    if the algorithm is "MD5" or unspecified (which then defaults to MD5):
+
+    A1 = unq(username-value) ":" unq(realm-value) ":" passwd
+
+    if the algorithm is "MD5-sess" then:
+
+    A1 = H( unq(username-value) ":" unq(realm-value) ":" passwd )
+         ":" unq(nonce-value) ":" unq(cnonce-value)
+  */
+
+  md5this = (unsigned char *)
+    aprintf("%s:%s:%s", userp, d->realm, passwdp);
+  if(!md5this)
+    return CURLE_OUT_OF_MEMORY;
+
+  CURL_OUTPUT_DIGEST_CONV(data, md5this); /* convert on non-ASCII machines */
+  Curl_md5it(md5buf, md5this);
+  free(md5this); /* free this again */
+
+  ha1 = malloc(33); /* 32 digits and 1 zero byte */
+  if(!ha1)
+    return CURLE_OUT_OF_MEMORY;
+
+  md5_to_ascii(md5buf, ha1);
+
+  if(d->algo == CURLDIGESTALGO_MD5SESS) {
+    /* nonce and cnonce are OUTSIDE the hash */
+    tmp = aprintf("%s:%s:%s", ha1, d->nonce, d->cnonce);
+    if(!tmp)
+      return CURLE_OUT_OF_MEMORY;
+    CURL_OUTPUT_DIGEST_CONV(data, tmp); /* convert on non-ASCII machines */
+    Curl_md5it(md5buf, (unsigned char *)tmp);
+    free(tmp); /* free this again */
+    md5_to_ascii(md5buf, ha1);
+  }
+
+  /*
+    If the "qop" directive's value is "auth" or is unspecified, then A2 is:
+
+      A2       = Method ":" digest-uri-value
+
+          If the "qop" value is "auth-int", then A2 is:
+
+      A2       = Method ":" digest-uri-value ":" H(entity-body)
+
+    (The "Method" value is the HTTP request method as specified in section
+    5.1.1 of RFC 2616)
+  */
+
+  /* So IE browsers < v7 cut off the URI part at the query part when they
+     evaluate the MD5 and some (IIS?) servers work with them so we may need to
+     do the Digest IE-style. Note that the different ways cause different MD5
+     sums to get sent.
+
+     Apache servers can be set to do the Digest IE-style automatically using
+     the BrowserMatch feature:
+     http://httpd.apache.org/docs/2.2/mod/mod_auth_digest.html#msie
+
+     Further details on Digest implementation differences:
+     http://www.fngtps.com/2006/09/http-authentication
+  */
+  if(authp->iestyle && ((tmp = strchr((char *)uripath, '?')) != NULL)) {
+    md5this = (unsigned char *)aprintf("%s:%.*s", request,
+                                       curlx_sztosi(tmp - (char *)uripath),
+                                       uripath);
+  }
+  else
+    md5this = (unsigned char *)aprintf("%s:%s", request, uripath);
+
+  if(!md5this) {
+    free(ha1);
+    return CURLE_OUT_OF_MEMORY;
+  }
+
+  if(d->qop && Curl_raw_equal(d->qop, "auth-int")) {
+    /* We don't support auth-int at the moment. I can't see a easy way to get
+       entity-body here */
+    /* TODO: Append H(entity-body)*/
+  }
+  CURL_OUTPUT_DIGEST_CONV(data, md5this); /* convert on non-ASCII machines */
+  Curl_md5it(md5buf, md5this);
+  free(md5this); /* free this again */
+  md5_to_ascii(md5buf, ha2);
+
+  if(d->qop) {
+    md5this = (unsigned char *)aprintf("%s:%s:%08x:%s:%s:%s",
+                                       ha1,
+                                       d->nonce,
+                                       d->nc,
+                                       d->cnonce,
+                                       d->qop,
+                                       ha2);
+  }
+  else {
+    md5this = (unsigned char *)aprintf("%s:%s:%s",
+                                       ha1,
+                                       d->nonce,
+                                       ha2);
+  }
+  free(ha1);
+  if(!md5this)
+    return CURLE_OUT_OF_MEMORY;
+
+  CURL_OUTPUT_DIGEST_CONV(data, md5this); /* convert on non-ASCII machines */
+  Curl_md5it(md5buf, md5this);
+  free(md5this); /* free this again */
+  md5_to_ascii(md5buf, request_digest);
+
+  /* for test case 64 (snooped from a Mozilla 1.3a request)
+
+    Authorization: Digest username="testuser", realm="testrealm", \
+    nonce="1053604145", uri="/64", response="c55f7f30d83d774a3d2dcacf725abaca"
+  */
+
+  if(d->qop) {
+    *allocuserpwd =
+      aprintf( "%sAuthorization: Digest "
+               "username=\"%s\", "
+               "realm=\"%s\", "
+               "nonce=\"%s\", "
+               "uri=\"%s\", "
+               "cnonce=\"%s\", "
+               "nc=%08x, "
+               "qop=%s, "
+               "response=\"%s\"",
+               proxy?"Proxy-":"",
+               userp,
+               d->realm,
+               d->nonce,
+               uripath, /* this is the PATH part of the URL */
+               d->cnonce,
+               d->nc,
+               d->qop,
+               request_digest);
+
+    if(Curl_raw_equal(d->qop, "auth"))
+      d->nc++; /* The nc (from RFC) has to be a 8 hex digit number 0 padded
+                  which tells to the server how many times you are using the
+                  same nonce in the qop=auth mode. */
+  }
+  else {
+    *allocuserpwd =
+      aprintf( "%sAuthorization: Digest "
+               "username=\"%s\", "
+               "realm=\"%s\", "
+               "nonce=\"%s\", "
+               "uri=\"%s\", "
+               "response=\"%s\"",
+               proxy?"Proxy-":"",
+               userp,
+               d->realm,
+               d->nonce,
+               uripath, /* this is the PATH part of the URL */
+               request_digest);
+  }
+  if(!*allocuserpwd)
+    return CURLE_OUT_OF_MEMORY;
+
+  /* Add optional fields */
+  if(d->opaque) {
+    /* append opaque */
+    tmp = aprintf("%s, opaque=\"%s\"", *allocuserpwd, d->opaque);
+    if(!tmp)
+      return CURLE_OUT_OF_MEMORY;
+    free(*allocuserpwd);
+    *allocuserpwd = tmp;
+  }
+
+  if(d->algorithm) {
+    /* append algorithm */
+    tmp = aprintf("%s, algorithm=\"%s\"", *allocuserpwd, d->algorithm);
+    if(!tmp)
+      return CURLE_OUT_OF_MEMORY;
+    free(*allocuserpwd);
+    *allocuserpwd = tmp;
+  }
+
+  /* append CRLF + zero (3 bytes) to the userpwd header */
+  tmp = realloc(*allocuserpwd, strlen(*allocuserpwd) + 3);
+  if(!tmp)
+    return CURLE_OUT_OF_MEMORY;
+  strcat(tmp, "\r\n");
+  *allocuserpwd = tmp;
+
+  return CURLE_OK;
+}
+
+static void digest_cleanup_one(struct digestdata *d)
+{
+  if(d->nonce)
+    free(d->nonce);
+  d->nonce = NULL;
+
+  if(d->cnonce)
+    free(d->cnonce);
+  d->cnonce = NULL;
+
+  if(d->realm)
+    free(d->realm);
+  d->realm = NULL;
+
+  if(d->opaque)
+    free(d->opaque);
+  d->opaque = NULL;
+
+  if(d->qop)
+    free(d->qop);
+  d->qop = NULL;
+
+  if(d->algorithm)
+    free(d->algorithm);
+  d->algorithm = NULL;
+
+  d->nc = 0;
+  d->algo = CURLDIGESTALGO_MD5; /* default algorithm */
+  d->stale = FALSE; /* default means normal, not stale */
+}
+
+
+void Curl_digest_cleanup(struct SessionHandle *data)
+{
+  digest_cleanup_one(&data->state.digest);
+  digest_cleanup_one(&data->state.proxydigest);
+}
+
+#endif