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Reorganize some of the http code and split it into more functions.

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Implement fetchStatHTTP().
Unbungle struct url, and add fetchFreeURL().
Document it.
This commit is contained in:
Dag-Erling Smørgrav 2000-05-11 13:31:02 +00:00
parent d1c418891e
commit 60245e42b0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=60376
4 changed files with 203 additions and 103 deletions
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48
lib/libfetch/fetch.3
View File

@ -28,11 +28,12 @@
.Dt FETCH 3
.Os
.Sh NAME
.Nm fetchParseURL ,
.Nm fetchFreeURL ,
.Nm fetchGetURL ,
.Nm fetchPutURL ,
.Nm fetchStatURL ,
.Nm fetchListURL ,
.Nm fetchParseURL ,
.Nm fetchGet ,
.Nm fetchPut ,
.Nm fetchStat ,
@ -56,6 +57,10 @@
.Fd #include <sys/param.h>
.Fd #include <stdio.h>
.Fd #include <fetch.h>
.Ft struct url *
.Fn fetchParseURL "char *URL"
.Ft void
.Fn fetchFreeURL "struct url *URL"
.Ft FILE *
.Fn fetchGetURL "char *URL" "char *flags"
.Ft FILE *
@ -64,8 +69,6 @@
.Fn fetchStatURL "char *URL" "struct url_stat *us" "char *flags"
.Ft struct url_ent *
.Fn fetchListURL "char *URL" "char *flags"
.Ft struct url *
.Fn fetchParseURL "char *URL"
.Ft FILE *
.Fn fetchGet "struct url *URL" "char *flags"
.Ft FILE *
@ -103,6 +106,25 @@
These functions implement a high-level library for retrieving and
uploading files using Uniform Resource Locators (URLs).
.Pp
.Fn fetchParseURL
takes a URL in the form of a null-terminated string and splits it into
its components function according to the Common Internet Scheme Syntax
detailed in RFC1738. A regular expression which produces this syntax
is:
.Bd -literal
<scheme>:(//(<user>(:<pwd>)?@)?<host>(:<port>)?)?/(<document>)?
.Ed
.Pp
Note that some components of the URL are not necessarily relevant to
all URL schemes.
For instance, the file scheme only needs the <scheme>
and <document> components.
.Pp
The pointer returned by
.Fn fetchParseURL
should be freed using
.Fn fetchFreeURL .
.Pp
.Fn fetchGetURL
and
.Fn fetchPutURL
@ -158,25 +180,6 @@ The pointer returned by
should be freed using
.Fn free .
.Pp
.Fn fetchParseURL
takes a URL in the form of a null-terminated string and splits it into
its components function according to the Common Internet Scheme Syntax
detailed in RFC1738. A regular expression which produces this syntax
is:
.Bd -literal
<scheme>:(//(<user>(:<pwd>)?@)?<host>(:<port>)?)?/(<document>)?
.Ed
.Pp
Note that some components of the URL are not necessarily relevant to
all URL schemes.
For instance, the file scheme only needs the <scheme>
and <document> components.
.Pp
The pointer returned by
.Fn fetchParseURL
should be freed using
.Fn free .
.Pp
.Fn fetchGet ,
.Fn fetchPut
and
@ -414,7 +417,6 @@ Some parts of the library are not yet implemented.
The most notable
examples of this are
.Fn fetchPutHTTP ,
.Fn fetchStatHTTP ,
.Fn fetchListHTTP ,
.Fn fetchListFTP
and FTP proxy support.

38
lib/libfetch/fetch.c
View File

@ -152,7 +152,7 @@ fetchGetURL(char *URL, char *flags)
f = fetchGet(u, flags);
free(u);
fetchFreeURL(u);
return f;
}
@ -171,7 +171,7 @@ fetchPutURL(char *URL, char *flags)
f = fetchPut(u, flags);
free(u);
fetchFreeURL(u);
return f;
}
@ -189,7 +189,7 @@ fetchStatURL(char *URL, struct url_stat *us, char *flags)
s = fetchStat(u, us, flags);
free(u);
fetchFreeURL(u);
return s;
}
@ -207,7 +207,7 @@ fetchListURL(char *URL, char *flags)
ue = fetchList(u, flags);
free(u);
fetchFreeURL(u);
return ue;
}
@ -282,19 +282,13 @@ fetchParseURL(char *URL)
nohost:
/* document */
if (*p) {
struct url *t;
t = realloc(u, sizeof *u + strlen(p) - 1);
if (t == NULL) {
errno = ENOMEM;
_fetch_syserr();
goto ouch;
}
u = t;
strcpy(u->doc, p);
} else {
u->doc[0] = '/';
u->doc[1] = 0;
if (!*p)
p = "/";
if ((u->doc = strdup(p)) == NULL) {
errno = ENOMEM;
_fetch_syserr();
goto ouch;
}
DEBUG(fprintf(stderr,
@ -313,3 +307,13 @@ fetchParseURL(char *URL)
free(u);
return NULL;
}
/*
* Free a URL
*/
void
fetchFreeURL(struct url *u)
{
free(u->doc);
free(u);
}

11
lib/libfetch/fetch.h
View File

@ -40,14 +40,14 @@
#define URL_PWDLEN 256
struct url {
off_t offset;
size_t length;
char scheme[URL_SCHEMELEN+1];
char user[URL_USERLEN+1];
char pwd[URL_PWDLEN+1];
char host[MAXHOSTNAMELEN+1];
int port;
char doc[2];
char *doc;
off_t offset;
size_t length;
};
struct url_stat {
@ -81,7 +81,6 @@ int fetchStatFTP(struct url *, struct url_stat *, char *);
struct url_ent *fetchListFTP(struct url *, char *);
/* Generic functions */
struct url *fetchParseURL(char *);
FILE *fetchGetURL(char *, char *);
FILE *fetchPutURL(char *, char *);
int fetchStatURL(char *, struct url_stat *, char *);
@ -91,6 +90,10 @@ FILE *fetchPut(struct url *, char *);
int fetchStat(struct url *, struct url_stat *, char *);
struct url_ent *fetchList(struct url *, char *);
/* URL parsing */
struct url *fetchParseURL(char *);
void fetchFreeURL(struct url *);
/* Last error code */
extern int fetchLastErrCode;
extern int fetchTimeout;

209
lib/libfetch/http.c
View File

@ -64,11 +64,13 @@
#include <err.h>
#include <ctype.h>
#include <locale.h>
#include <netdb.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "fetch.h"
@ -292,25 +294,19 @@ _http_auth(char *usr, char *pwd)
}
/*
* Retrieve a file by HTTP
* Connect to server or proxy
*/
FILE *
fetchGetHTTP(struct url *URL, char *flags)
_http_connect(struct url *URL, char *flags)
{
int sd = -1, e, i, enc = ENC_NONE, direct, verbose;
struct cookie *c;
char *ln, *p, *px, *q;
FILE *f, *cf;
int direct, sd = -1, verbose;
size_t len;
off_t pos = 0;
char *px;
FILE *f;
direct = (flags && strchr(flags, 'd'));
verbose = (flags && strchr(flags, 'v'));
/* allocate cookie */
if ((c = calloc(1, sizeof *c)) == NULL)
return NULL;
/* check port */
if (!URL->port) {
struct servent *se;
@ -374,20 +370,40 @@ fetchGetHTTP(struct url *URL, char *flags)
/* reopen as stream */
if ((f = fdopen(sd, "r+")) == NULL)
goto ouch;
c->real_f = f;
return f;
ouch:
if (sd >= 0)
close(sd);
_http_seterr(999); /* XXX do this properly RSN */
return NULL;
}
/*
* Send a HEAD or GET request
*/
int
_http_request(FILE *f, char *op, struct url *URL, char *flags)
{
int e, verbose;
char *ln, *p;
size_t len;
verbose = (flags && strchr(flags, 'v'));
/* send request (proxies require absolute form, so use that) */
if (verbose)
_fetch_info("requesting http://%s:%d%s",
URL->host, URL->port, URL->doc);
_http_cmd(f, "GET http://%s:%d%s HTTP/1.1" ENDL,
URL->host, URL->port, URL->doc);
_http_cmd(f, "%s %s://%s:%d%s HTTP/1.1" ENDL,
op, URL->scheme, URL->host, URL->port, URL->doc);
/* start sending headers away */
if (URL->user[0] || URL->pwd[0]) {
char *auth_str = _http_auth(URL->user, URL->pwd);
if (!auth_str)
goto fouch;
return 999; /* XXX wrong */
_http_cmd(f, "Authorization: Basic %s" ENDL, auth_str);
free(auth_str);
}
@ -399,7 +415,7 @@ fetchGetHTTP(struct url *URL, char *flags)
/* get response */
if ((ln = fgetln(f, &len)) == NULL)
goto fouch;
return 999;
DEBUG(fprintf(stderr, "response: [\033[1m%*.*s\033[m]\n",
(int)len-2, (int)len-2, ln));
@ -410,9 +426,55 @@ fetchGetHTTP(struct url *URL, char *flags)
while ((p < ln + len) && !isdigit(*p))
p++;
if (!isdigit(*p))
goto fouch;
return 999;
e = atoi(p);
DEBUG(fprintf(stderr, "code: [\033[1m%d\033[m]\n", e));
return e;
}
/*
* Check a header line
*/
char *
_http_match(char *str, char *hdr)
{
while (*str && *hdr && tolower(*str++) == tolower(*hdr++))
/* nothing */;
if (*str || *hdr != ':')
return NULL;
while (*hdr && isspace(*++hdr))
/* nothing */;
return hdr;
}
/*
* Retrieve a file by HTTP
*/
FILE *
fetchGetHTTP(struct url *URL, char *flags)
{
int e, enc = ENC_NONE, i, verbose;
struct cookie *c;
char *ln, *p, *q;
FILE *f, *cf;
size_t len;
off_t pos = 0;
verbose = (flags && strchr(flags, 'v'));
/* allocate cookie */
if ((c = calloc(1, sizeof *c)) == NULL)
return NULL;
/* connect */
if ((f = _http_connect(URL, flags)) == NULL) {
free(c);
return NULL;
}
c->real_f = f;
e = _http_request(f, "GET", URL, flags);
/* add code to handle redirects later */
if (e != (URL->offset ? HTTP_PARTIAL : HTTP_OK)) {
@ -426,49 +488,33 @@ fetchGetHTTP(struct url *URL, char *flags)
goto fouch;
if ((ln[0] == '\r') || (ln[0] == '\n'))
break;
DEBUG(fprintf(stderr, "header: [\033[1m%*.*s\033[m]\n",
(int)len-2, (int)len-2, ln));
#define XFERENC "Transfer-Encoding:"
if (strncasecmp(ln, XFERENC, sizeof XFERENC - 1) == 0) {
p = ln + sizeof XFERENC - 1;
while ((p < ln + len) && isspace(*p))
p++;
for (q = p; (q < ln + len) && !isspace(*q); q++)
while (isspace(ln[len-1]))
--len;
ln[len] = '\0'; /* XXX */
DEBUG(fprintf(stderr, "header: [\033[1m%s\033[m]\n", ln));
if ((p = _http_match("Transfer-Encoding", ln)) != NULL) {
for (q = p; *q && !isspace(*q); q++)
/* VOID */ ;
*q = 0;
if (strcasecmp(p, "chunked") == 0)
enc = ENC_CHUNKED;
DEBUG(fprintf(stderr, "xferenc: [\033[1m%s\033[m]\n", p));
#undef XFERENC
#define CONTTYPE "Content-Type:"
} else if (strncasecmp(ln, CONTTYPE, sizeof CONTTYPE - 1) == 0) {
p = ln + sizeof CONTTYPE - 1;
while ((p < ln + len) && isspace(*p))
p++;
for (i = 0; p < ln + len; p++)
if (i < HTTPCTYPELEN)
c->content_type[i++] = *p;
DEBUG(fprintf(stderr, "transfer encoding: [\033[1m%s\033[m]\n", p));
} else if ((p = _http_match("Content-Type", ln)) != NULL) {
for (i = 0; *p && i < HTTPCTYPELEN; p++, i++)
c->content_type[i] = *p;
do c->content_type[i--] = 0; while (isspace(c->content_type[i]));
DEBUG(fprintf(stderr, "conttype: [\033[1m%s\033[m]\n",
DEBUG(fprintf(stderr, "content type: [\033[1m%s\033[m]\n",
c->content_type));
#undef CONTTYPE
#define CONTRANGE "Content-Range:"
#define BYTES "bytes "
} else if (strncasecmp(ln, CONTRANGE, sizeof CONTRANGE - 1) == 0) {
p = ln + sizeof CONTRANGE - 1;
while ((p < ln + len) && isspace(*p))
p++;
if (strncasecmp(p, BYTES, sizeof BYTES - 1) != 0
|| (p += 6) >= ln + len)
} else if ((p = _http_match("Content-Range", ln)) != NULL) {
if (strncasecmp(p, "bytes ", 6) != 0)
goto fouch;
while ((p < ln + len) && isdigit(*p))
p += 6;
while (*p && isdigit(*p))
pos = pos * 10 + (*p++ - '0');
/* XXX wouldn't hurt to be slightly more paranoid here */
DEBUG(fprintf(stderr, "contrange: [\033[1m%lld-\033[m]\n", pos));
DEBUG(fprintf(stderr, "content range: [\033[1m%lld-\033[m]\n", pos));
if (pos > URL->offset)
goto fouch;
#undef BYTES
#undef CONTRANGE
}
}
@ -488,12 +534,6 @@ fetchGetHTTP(struct url *URL, char *flags)
return cf;
ouch:
if (sd >= 0)
close(sd);
free(c);
_http_seterr(999); /* XXX do this properly RSN */
return NULL;
fouch:
fclose(f);
free(c);
@ -516,10 +556,61 @@ fetchPutHTTP(struct url *URL, char *flags)
* Get an HTTP document's metadata
*/
int
fetchStatHTTP(struct url *url, struct url_stat *us, char *flags)
fetchStatHTTP(struct url *URL, struct url_stat *us, char *flags)
{
warnx("fetchStatHTTP(): not implemented");
return -1;
int e, verbose;
size_t len;
char *ln, *p;
FILE *f;
verbose = (flags && strchr(flags, 'v'));
/* connect */
if ((f = _http_connect(URL, flags)) == NULL)
return -1;
if ((e = _http_request(f, "HEAD", URL, flags)) != HTTP_OK) {
_http_seterr(e);
goto ouch;
}
while (1) {
if ((ln = fgetln(f, &len)) == NULL)
goto fouch;
if ((ln[0] == '\r') || (ln[0] == '\n'))
break;
while (isspace(ln[len-1]))
--len;
ln[len] = '\0'; /* XXX */
DEBUG(fprintf(stderr, "header: [\033[1m%s\033[m]\n", ln));
if ((p = _http_match("Last-Modified", ln)) != NULL) {
struct tm tm;
char locale[64];
strncpy(locale, setlocale(LC_TIME, NULL), sizeof locale);
setlocale(LC_TIME, "C");
strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm);
/* XXX should add support for date-2 and date-3 */
setlocale(LC_TIME, locale);
us->atime = us->mtime = timegm(&tm);
DEBUG(fprintf(stderr, "last modified: [\033[1m%04d-%02d-%02d "
"%02d:%02d:%02d\033[m]\n",
tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
tm.tm_hour, tm.tm_min, tm.tm_sec));
} else if ((p = _http_match("Content-Length", ln)) != NULL) {
us->size = 0;
while (*p && isdigit(*p))
us->size = us->size * 10 + (*p++ - '0');
DEBUG(fprintf(stderr, "content length: [\033[1m%lld\033[m]\n", us->size));
}
}
return 0;
ouch:
_http_seterr(999); /* XXX do this properly RSN */
fouch:
fclose(f);
return -1;
}
/*