From 6ca2e52598ec57d7e54a46315daf1e7018b8333f Mon Sep 17 00:00:00 2001
From: Nick White <hg@njw.me.uk>
Date: Sun, 17 Jul 2011 15:48:24 +0100
Subject: Add ip setting and improve robustness of http

---
 getgbook.c | 25 +++++++++++++++++--------
 util.c     | 10 +++++-----
 2 files changed, 22 insertions(+), 13 deletions(-)

diff --git a/getgbook.c b/getgbook.c
index c208e25..df5de6f 100644
--- a/getgbook.c
+++ b/getgbook.c
@@ -5,9 +5,10 @@
 #include "util.c"
 
 #define usage "getgbook " VERSION " - a google books downloader\n" \
-              "usage: getgbook [-p|-a] isbn\n" \
+              "usage: getgbook [-i ip] [-p|-a] isbn\n" \
               "  -p print all available pages\n" \
               "  -a download all available pages\n" \
+              "  -i appear from ip address\n" \
               "  otherwise, all pages in stdin will be downloaded\n"
 
 #define URLMAX 1024
@@ -19,6 +20,8 @@ typedef struct {
 	char name[80];
 } Page;
 
+char extrahdr[1024] = "\0";
+
 char *getbookid(char *isbn)
 {
 	char url[URLMAX];
@@ -26,7 +29,7 @@ char *getbookid(char *isbn)
 
 	snprintf(url, URLMAX, "/books/feeds/volumes?q=isbn:%s", isbn);
 
-	if(!get("books.google.com", url, &buf))
+	if(!get("books.google.com", url, extrahdr, &buf))
 		return NULL;
 
 	if((c = strstr(buf,"<dc:identifier>")) == NULL)
@@ -49,7 +52,7 @@ int gettotalpages(char *bookid)
 
 	bookid = malloc(sizeof(char *) * BOOKID_LEN);
 
-	if(!get("books.google.com", url, &buf))
+	if(!get("books.google.com", url, extrahdr, &buf))
 		return 0;
 
 	if((c = strstr(buf," pages</dc:format>")) == NULL)
@@ -68,7 +71,7 @@ Page *getpagedetail(char *bookid, char *pg)
 
 	snprintf(url, URLMAX, "/books?id=%s&pg=%s&jscmd=click3", bookid, pg);
 
-	if(!get("books.google.com", url, &buf))
+	if(!get("books.google.com", url, extrahdr, &buf))
 		return NULL;
 
 	snprintf(m, 80, "\"pid\":\"%s\"", pg);
@@ -113,10 +116,16 @@ int main(int argc, char *argv[])
 	int totalpages, i;
 	Page *page;
 
-	if(argc < 2 || argc > 3 ||
-	   (argv[1][0]=='-' && ((argv[1][1]!='p' && argv[1][1]!='a') || argc < 3)))
+	if(argc < 2 || argc > 5 ||
+	   (argv[1][0]=='-' && ((argv[1][1]!='p' && argv[1][1]!='a' && argv[1][1] != 'i') || argc < 3)))
 		die(usage);
 
+	if(argv[1][0] == '-' && argv[1][1] == 'i') {
+		snprintf(extrahdr, 1024, "X-Forwarded-For: %s\r\n", argv[2]);
+		argv+=2;
+		argc-=2;
+	}
+
 	if((bookid = getbookid(argv[argc-1])) == NULL)
 		die("Could not find book\n");
 
@@ -137,7 +146,7 @@ int main(int argc, char *argv[])
 			}
 			if(argv[1][1] == 'a') {
 				snprintf(n, 80, "%05d.png", page->num);
-				gettofile(page->url, n);
+				gettofile("books.google.com", page->url, extrahdr, n);
 				printf("Downloaded page %d\n", page->num);
 			} else
 				printf("%d\n", page->num);
@@ -154,7 +163,7 @@ int main(int argc, char *argv[])
 				continue;
 			}
 			snprintf(n, 80, "%05d.png", page->num);
-			gettofile(page->url, n);
+			gettofile("books.google.com", page->url, extrahdr, n);
 			printf("Downloaded page %d\n", page->num);
 			free(page);
 		}
diff --git a/util.c b/util.c
index 2cb7c99..68d1d72 100644
--- a/util.c
+++ b/util.c
@@ -33,7 +33,7 @@ static int dial(char *host, char *port) {
 	return srv;
 }
 
-int get(char *host, char *path, char **buf) {
+int get(char *host, char *path, char *extrahdr, char **buf) {
 	size_t l, res;
 	int fd, i, p;
 	char h[1024] = "\0";
@@ -43,13 +43,13 @@ int get(char *host, char *path, char **buf) {
 	srv = fdopen(fd, "r+");
 
 	fprintf(srv, "GET %s HTTP/1.0\r\nUser-Agent: getgbook-"VERSION \
-	             " (not mozilla)\r\nHost: %s\r\n\r\n", path, host);
+	             " (not mozilla)\r\n%sHost: %s\r\n\r\n", path, extrahdr, host);
 	fflush(srv);
 
 	while(h[0] != '\r') {
 		fgets(h, 1024, srv);
 		if(sscanf(h, "HTTP/%d.%d %d", &i, &i, &p) == 3 && p != 200)
-			return 1;
+			return 0;
 	}
 
 	*buf = malloc(sizeof(char *) * 4096);
@@ -60,12 +60,12 @@ int get(char *host, char *path, char **buf) {
 	return l;
 }
 
-int gettofile(char *url, char *savepath) {
+int gettofile(char *host, char *url, char *extrahdr, char *savepath) {
 	char *buf = 0;
 	FILE *f;
 	size_t i, l;
 
-	if(!(l = get("books.google.com", url, &buf))) {
+	if(!(l = get(host, url, extrahdr, &buf))) {
 		fprintf(stderr, "Could not download %s\n", url);
 		return 1;
 	}
-- 
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