Curl couldn't resolve host

[Extrasklep]

Hello, I'm trying to download files using CURL but every time curl gives some weird errors
The URLs are valid and internet settings are correct and everything
The errors I get:

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* timeout on name lookup is not supported
* Curl_ipv4_resolve_r failed for (domain)
* Couldn't resolve host '(domain)'
* Closing connection 0

If I try an IP address it's just

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* timeout on name lookup is not supported
* Closing connection 0

My code:

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int http_init() {
    return curl_global_init(CURL_GLOBAL_ALL); //this doesn't return any errors
}

void http_exit() {
    curl_global_cleanup();
}


//curl write data function
static size_t write_data(void *ptr, size_t size, size_t nmemb, void *stream) {
    size_t written = fwrite(ptr, size, nmemb, (FILE *)stream);
    return written;
}

unsigned char http_downloadfile(const char* url, const char* filename) {
    std::cout << url << ", " << filename << '\n';
    CURL *curl_handle;
    CURLcode cres;
    FILE *file;
    
    /* init the curl session */ 
    curl_handle = curl_easy_init();
    
    /* set URL to get here */ 
    curl_easy_setopt(curl_handle, CURLOPT_URL, url);
    
    /* Switch on full protocol/debug output while testing */ 
    curl_easy_setopt(curl_handle, CURLOPT_VERBOSE, 1L);
    
    /* disable progress meter, set to 0L to enable it */ 
    curl_easy_setopt(curl_handle, CURLOPT_NOPROGRESS, 1L);
    
    /* send all data to this function  */ 
    curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, write_data);
    
    curl_easy_setopt(curl_handle, CURLOPT_FOLLOWLOCATION, 1L);
    
    curl_easy_setopt(curl_handle, CURLOPT_FAILONERROR, 1L);
    
    curl_easy_setopt(curl_handle, CURLOPT_HTTP_VERSION, (long)CURL_HTTP_VERSION_2TLS);
    
    curl_easy_setopt(curl_handle, CURLOPT_SSL_VERIFYPEER, 0L);
    
    curl_easy_setopt(curl_handle, CURLOPT_USERAGENT, "Mozilla/5.0 (Nintendo 3DS; U; ; en) AppleWebKit/536.30 (KHTML, like Gecko)");
    
    curl_easy_setopt(curl_handle, CURLOPT_STDERR, stdout);
    
    //Open file
    file = fopen(filename, "wb");
    if(file) {
        /* write the page body to this file handle */ 
        curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, file);
        
        /* get it! */ 
        cres = curl_easy_perform(curl_handle);
        
        /* close the header file */ 
        fclose(file);
    } else {
        //Unable to open file
        std::cout << "Unable to open file in http_downloadfile\n";
        return 255;
    }
    
    curl_easy_cleanup(curl_handle);
    
    if (cres != CURLE_OK) {
        return 128;
    }
    
    return 0;
}

[83tropicstorm]

Hello! I'm rather new to homebrew development (and using C++/C in general) and for some reason I cannot get libcurl to function. I copied over a snippet of code that I had already written using CURL but it wouldn't print out the text file like I wanted. Just to make sure I wasn't doing anything wrong programming wise, I went ahead and copied and pasted a simple example of libcurl I found online and I keep getting the same error. The file I'm linking to can be accessed through the 3DS web browser. I even tried replacing the url with Google but it STILL didn't work! I am not getting any compiler errors and the makefile should be configured properly. I also redownloaded the 3ds toolchain and I am still having this issue. I even tried compiling it as a C file instead of a C++ file in case that was causing it but as you probably guessed, it was pretty useless. I am using Windows (Specifically Windows 10) if that matters. Any help would be GREATLY appreciated as I have wasted almost two days trying to get this to work properly.

This is the code with the 'simple.c' example:

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#include <stdio.h>
#include <curl/curl.h>
#include <3ds.h>

int main(int argc, const char* argv[]) {
	//Initalize GFX
	gfxInitDefault();

	//Create print console objects.
	PrintConsole topScreen, bottomScreen;

	//Initialize the top and bottom screen to be used as console output.
	consoleInit(GFX_TOP, &topScreen);
	consoleInit(GFX_BOTTOM, &bottomScreen);

	consoleSelect(&topScreen);

	CURL* curl;
	CURLcode res;

	curl = curl_easy_init();
	if (curl) {
		curl_easy_setopt(curl, CURLOPT_URL, "http://192.168.42.68:800/file.txt");
		/* example.com is redirected, so we tell libcurl to follow redirection */
		curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);

		/* Perform the request, res will get the return code */
		res = curl_easy_perform(curl);
		/* Check for errors */
		if (res != CURLE_OK)
			fprintf(stderr, "curl_easy_perform() failed: %s\n",
				curl_easy_strerror(res));

		/* always cleanup */
		curl_easy_cleanup(curl);
	}

	//Main loop
	while (aptMainLoop()) {
		consoleSelect(&topScreen);

		hidScanInput();
		u32 kDown = hidKeysDown();

		if (kDown & KEY_START)
			break;

		gfxFlushBuffers();
		gfxSwapBuffers();

		gspWaitForVBlank();
	}

	gfxExit();
}

In case it matters, here is the Makefile I'm using as well:

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#---------------------------------------------------------------------------------
.SUFFIXES:
#---------------------------------------------------------------------------------

ifeq ($(strip $(DEVKITARM)),)
$(error "Please set DEVKITARM in your environment. export DEVKITARM=<path to>devkitARM")
endif

TOPDIR ?= $(CURDIR)
include $(DEVKITARM)/3ds_rules

#---------------------------------------------------------------------------------
# TARGET is the name of the output
# BUILD is the directory where object files & intermediate files will be placed
# SOURCES is a list of directories containing source code
# DATA is a list of directories containing data files
# INCLUDES is a list of directories containing header files
# GRAPHICS is a list of directories containing graphics files
# GFXBUILD is the directory where converted graphics files will be placed
#   If set to $(BUILD), it will statically link in the converted
#   files as if they were data files.
#
# NO_SMDH: if set to anything, no SMDH file is generated.
# ROMFS is the directory which contains the RomFS, relative to the Makefile (Optional)
# APP_TITLE is the name of the app stored in the SMDH file (Optional)
# APP_DESCRIPTION is the description of the app stored in the SMDH file (Optional)
# APP_AUTHOR is the author of the app stored in the SMDH file (Optional)
# ICON is the filename of the icon (.png), relative to the project folder.
#   If not set, it attempts to use one of the following (in this order):
#     - <Project name>.png
#     - icon.png
#     - <libctru folder>/default_icon.png
#---------------------------------------------------------------------------------
TARGET		:=	$(notdir $(CURDIR))
BUILD		:=	build
SOURCES		:=	source
DATA		:=	data
INCLUDES	:=	include
GRAPHICS	:=	gfx
GFXBUILD	:=	$(BUILD)
#ROMFS		:=	romfs
#GFXBUILD	:=	$(ROMFS)/gfx

#---------------------------------------------------------------------------------
# options for code generation
#---------------------------------------------------------------------------------
ARCH	:=	-march=armv6k -mtune=mpcore -mfloat-abi=hard -mtp=soft

CFLAGS	:=	-g -Wall -O2 -mword-relocations \
			-fomit-frame-pointer -ffunction-sections \
			`curl-config --cflags` \
			$(ARCH)

CFLAGS	+=	$(INCLUDE)  -DARM11 -D_3DS -I/opt/devkitpro/portlibs/3ds/include/

CXXFLAGS	:= $(CFLAGS) -fno-rtti -fno-exceptions -std=gnu++11

ASFLAGS	:=	-g $(ARCH)
LDFLAGS	=	-specs=3dsx.specs -g $(ARCH) -Wl,-Map,$(notdir $*.map)

LIBS	:=  `curl-config --libs`

#---------------------------------------------------------------------------------
# list of directories containing libraries, this must be the top level containing
# include and lib
#---------------------------------------------------------------------------------
LIBDIRS	:= $(CTRULIB) $(PORTLIBS)


#---------------------------------------------------------------------------------
# no real need to edit anything past this point unless you need to add additional
# rules for different file extensions
#---------------------------------------------------------------------------------
ifneq ($(BUILD),$(notdir $(CURDIR)))
#---------------------------------------------------------------------------------

export OUTPUT	:=	$(CURDIR)/$(TARGET)
export TOPDIR	:=	$(CURDIR)

export VPATH	:=	$(foreach dir,$(SOURCES),$(CURDIR)/$(dir)) \
			$(foreach dir,$(GRAPHICS),$(CURDIR)/$(dir)) \
			$(foreach dir,$(DATA),$(CURDIR)/$(dir))

export DEPSDIR	:=	$(CURDIR)/$(BUILD)

CFILES		:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.c)))
CPPFILES	:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.cpp)))
SFILES		:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.s)))
PICAFILES	:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.v.pica)))
SHLISTFILES	:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.shlist)))
GFXFILES	:=	$(foreach dir,$(GRAPHICS),$(notdir $(wildcard $(dir)/*.t3s)))
BINFILES	:=	$(foreach dir,$(DATA),$(notdir $(wildcard $(dir)/*.*)))

#---------------------------------------------------------------------------------
# use CXX for linking C++ projects, CC for standard C
#---------------------------------------------------------------------------------
ifeq ($(strip $(CPPFILES)),)
#---------------------------------------------------------------------------------
	export LD	:=	$(CC)
#---------------------------------------------------------------------------------
else
#---------------------------------------------------------------------------------
	export LD	:=	$(CXX)
#---------------------------------------------------------------------------------
endif
#---------------------------------------------------------------------------------

#---------------------------------------------------------------------------------
ifeq ($(GFXBUILD),$(BUILD))
#---------------------------------------------------------------------------------
export T3XFILES :=  $(GFXFILES:.t3s=.t3x)
#---------------------------------------------------------------------------------
else
#---------------------------------------------------------------------------------
export ROMFS_T3XFILES	:=	$(patsubst %.t3s, $(GFXBUILD)/%.t3x, $(GFXFILES))
export T3XHFILES		:=	$(patsubst %.t3s, $(BUILD)/%.h, $(GFXFILES))
#---------------------------------------------------------------------------------
endif
#---------------------------------------------------------------------------------

export OFILES_SOURCES 	:=	$(CPPFILES:.cpp=.o) $(CFILES:.c=.o) $(SFILES:.s=.o)

export OFILES_BIN	:=	$(addsuffix .o,$(BINFILES)) \
			$(PICAFILES:.v.pica=.shbin.o) $(SHLISTFILES:.shlist=.shbin.o) \
			$(addsuffix .o,$(T3XFILES))

export OFILES := $(OFILES_BIN) $(OFILES_SOURCES)

export HFILES	:=	$(PICAFILES:.v.pica=_shbin.h) $(SHLISTFILES:.shlist=_shbin.h) \
			$(addsuffix .h,$(subst .,_,$(BINFILES))) \
			$(GFXFILES:.t3s=.h)

export INCLUDE	:=	$(foreach dir,$(INCLUDES),-I$(CURDIR)/$(dir)) \
			$(foreach dir,$(LIBDIRS),-I$(dir)/include) \
			-I$(CURDIR)/$(BUILD)

export LIBPATHS	:=	$(foreach dir,$(LIBDIRS),-L$(dir)/lib)

export _3DSXDEPS	:=	$(if $(NO_SMDH),,$(OUTPUT).smdh)

ifeq ($(strip $(ICON)),)
	icons := $(wildcard *.png)
	ifneq (,$(findstring $(TARGET).png,$(icons)))
		export APP_ICON := $(TOPDIR)/$(TARGET).png
	else
		ifneq (,$(findstring icon.png,$(icons)))
			export APP_ICON := $(TOPDIR)/icon.png
		endif
	endif
else
	export APP_ICON := $(TOPDIR)/$(ICON)
endif

ifeq ($(strip $(NO_SMDH)),)
	export _3DSXFLAGS += --smdh=$(CURDIR)/$(TARGET).smdh
endif

ifneq ($(ROMFS),)
	export _3DSXFLAGS += --romfs=$(CURDIR)/$(ROMFS)
endif

.PHONY: all clean

#---------------------------------------------------------------------------------
all: $(BUILD) $(GFXBUILD) $(DEPSDIR) $(ROMFS_T3XFILES) $(T3XHFILES)
	@$(MAKE) --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile

$(BUILD):
	@mkdir -p $@

ifneq ($(GFXBUILD),$(BUILD))
$(GFXBUILD):
	@mkdir -p $@
endif

ifneq ($(DEPSDIR),$(BUILD))
$(DEPSDIR):
	@mkdir -p $@
endif

#---------------------------------------------------------------------------------
clean:
	@echo clean ...
	@rm -fr $(BUILD) $(TARGET).3dsx $(OUTPUT).smdh $(TARGET).elf $(GFXBUILD)

#---------------------------------------------------------------------------------
$(GFXBUILD)/%.t3x	$(BUILD)/%.h	:	%.t3s
#---------------------------------------------------------------------------------
	@echo $(notdir $<)
	@tex3ds -i $< -H $(BUILD)/$*.h -d $(DEPSDIR)/$*.d -o $(GFXBUILD)/$*.t3x

#---------------------------------------------------------------------------------
else

#---------------------------------------------------------------------------------
# main targets
#---------------------------------------------------------------------------------
$(OUTPUT).3dsx	:	$(OUTPUT).elf $(_3DSXDEPS)

$(OFILES_SOURCES) : $(HFILES)

$(OUTPUT).elf	:	$(OFILES)

#---------------------------------------------------------------------------------
# you need a rule like this for each extension you use as binary data
#---------------------------------------------------------------------------------
%.bin.o	%_bin.h :	%.bin
#---------------------------------------------------------------------------------
	@echo $(notdir $<)
	@$(bin2o)

#---------------------------------------------------------------------------------
.PRECIOUS	:	%.t3x
#---------------------------------------------------------------------------------
%.t3x.o	%_t3x.h :	%.t3x
#---------------------------------------------------------------------------------
	@echo $(notdir $<)
	@$(bin2o)

#---------------------------------------------------------------------------------
# rules for assembling GPU shaders
#---------------------------------------------------------------------------------
define shader-as
	$(eval CURBIN := $*.shbin)
	$(eval DEPSFILE := $(DEPSDIR)/$*.shbin.d)
	echo "$(CURBIN).o: $< $1" > $(DEPSFILE)
	echo "extern const u8" `(echo $(CURBIN) | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`"_end[];" > `(echo $(CURBIN) | tr . _)`.h
	echo "extern const u8" `(echo $(CURBIN) | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`"[];" >> `(echo $(CURBIN) | tr . _)`.h
	echo "extern const u32" `(echo $(CURBIN) | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`_size";" >> `(echo $(CURBIN) | tr . _)`.h
	picasso -o $(CURBIN) $1
	bin2s $(CURBIN) | $(AS) -o $*.shbin.o
endef

%.shbin.o %_shbin.h : %.v.pica %.g.pica
	@echo $(notdir $^)
	@$(call shader-as,$^)

%.shbin.o %_shbin.h : %.v.pica
	@echo $(notdir $<)
	@$(call shader-as,$<)

%.shbin.o %_shbin.h : %.shlist
	@echo $(notdir $<)
	@$(call shader-as,$(foreach file,$(shell cat $<),$(dir $<)$(file)))

#---------------------------------------------------------------------------------
%.t3x	%.h	:	%.t3s
#---------------------------------------------------------------------------------
	@echo $(notdir $<)
	@tex3ds -i $< -H $*.h -d $*.d -o $*.t3x

-include $(DEPSDIR)/*.d

#---------------------------------------------------------------------------------------
endif
#---------------------------------------------------------------------------------------

[WinterMute]

Same answer for both here - you need to initialise the 3DS socket service before using curl.

See https://github.com/devkitPro/3ds-exampl ... .c#L70-L84 although I used atexit in that code for convenience. You don't need to as long as you call socExit before your app terminates.

[Extrasklep]

Thanks a lot, I'll try it when I have time