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netrc: Implement .netrc parsing #244

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netrc: Implement .netrc parsing #244

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ea153e9
netrc: Implement .netrc parsing
davidpolverari Oct 16, 2019
316997e
WIP refactoring
davidpolverari Oct 21, 2019
d5a9df9
Latest WIP commit. Includes most of the requested changes.
davidpolverari Oct 23, 2019
87d7320
Replace next_token with memtok and eliminate global vars.
davidpolverari Nov 13, 2019
1a5b638
Add netrc_t struct
davidpolverari Nov 22, 2019
ba0539d
Use netrc_t (wrongly) to test
davidpolverari Nov 27, 2019
1fc0dcc
Refactor netrc module and its usage
davidpolverari Dec 9, 2019
32f53bc
conn.c: Move netrc credential parsing code to conn_set
davidpolverari Dec 19, 2019
97b22a1
text.c: Remove netrc_filename var
davidpolverari Dec 19, 2019
6d2bfa3
netrc.c: Break long line
davidpolverari Dec 19, 2019
d0c858a
text.c: remove useless ternary operator
davidpolverari Dec 19, 2019
24a27fa
netrc: Store pointer to mmaped file instead of filename
davidpolverari Dec 19, 2019
f9192ab
netrc: Hide netrc_t implementation details from header file
davidpolverari Dec 21, 2019
5abebdf
WIP netrc support
ismaell Jan 19, 2020
802ffcf
WIP: netrc support
davidpolverari Jan 21, 2020
c2fc839
Minor changes
davidpolverari Jan 23, 2020
e303c11
Revert "Minor changes"
davidpolverari Jan 23, 2020
0103c49
WIP netrc: improve netrc_parse token copying
ismaell Jan 21, 2020
607f701
WIP netrc: make parser struct R/O and make netrc_parse void
ismaell Jan 21, 2020
67eec63
WIP netrc: move null check to netrc_parse
ismaell Jan 21, 2020
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5 changes: 3 additions & 2 deletions src/conf.h
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Original file line number Diff line number Diff line change
Expand Up @@ -42,8 +42,9 @@
#ifndef AXEL_CONF_H
#define AXEL_CONF_H

#include "netrc.h"

typedef struct {
char netrc_filename[MAX_STRING];
char default_filename[MAX_STRING];
char http_proxy[MAX_STRING];
char no_proxy[MAX_STRING];
Expand All @@ -68,7 +69,7 @@ typedef struct {
int search_threads;
int search_amount;
int search_top;
int use_netrc;
netrc_t *netrc;

unsigned io_timeout;

Expand Down
8 changes: 3 additions & 5 deletions src/conn.c
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Original file line number Diff line number Diff line change
Expand Up @@ -254,12 +254,10 @@ conn_init(conn_t *conn)
conn->ftp->local_if = conn->local_if;
conn->ftp->ftp_mode = FTP_PASSIVE;
conn->ftp->tcp.ai_family = conn->conf->ai_family;
if (conn->conf->use_netrc) {
netrc_t * netrc;
netrc = netrc_init(conn->conf->netrc_filename, conn->host, conn->user, sizeof(conn->user), conn->pass, sizeof(conn->pass));
netrc_parse(netrc);
if (conn->conf->netrc) {
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Code here shouldn't be conditional, and it should be for all protocols.

We want to support other formats, like authinfo, in the future.

It should be into a separate function, so that refactoring doesn't touch code around it:

conf_auth_setup(conf);

Also auto-login should only happen if we didn't got the credentials from somewhere else, so a check for that is needed.

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Well, I will move this code to the conn.c:conn_set() function, as that is the one that deals with parsing URLs and extracting fields like username, password and hostname from them and copying to conn_t. But once parsing is entangled with auth code, I'd rather leave this kind of refactoring to another PR.

netrc_parse(conn->conf->netrc, conn->host, conn->user, sizeof(conn->user), conn->pass, sizeof(conn->pass));
netrc_close(conn->conf->netrc);
printf("host: %s, user: %s, pass: %s\n", conn->host, conn->user, conn->pass);
netrc_close(netrc);
}
if (!ftp_connect(conn->ftp, conn->proto, conn->host, conn->port,
conn->user, conn->pass,
Expand Down
47 changes: 19 additions & 28 deletions src/netrc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -49,6 +49,7 @@ typedef struct {
size_t len;
} buffer_t;

static buffer_t tok, save_buf;
static const char *tok_delim = " \t\n";

static size_t
Expand Down Expand Up @@ -143,69 +144,59 @@ netrc_mmap(const char *filename, char **addr)
}

static void
get_creds(netrc_t *netrc, buffer_t last_tok, buffer_t *save_ptr)
get_creds(netrc_t *netrc, char *user, size_t user_len, char *pass, size_t pass_len)
{
buffer_t tok = last_tok;

while (tok.len) {
if (!strncmp("login", tok.data, tok.len)) {
tok = memtok(NULL, 0, tok_delim, save_ptr);
if (tok.len <= netrc->user_len)
strlcpy(netrc->user, tok.data, tok.len+1);
tok = memtok(NULL, 0, tok_delim, &save_buf);
if (tok.len <= user_len)
strlcpy(user, tok.data, tok.len+1);
} else if (!strncmp("password", tok.data, tok.len)) {
tok = memtok(NULL, 0, tok_delim, save_ptr);
if (tok.len <= netrc->pass_len)
strlcpy(netrc->pass, tok.data, tok.len+1);
tok = memtok(NULL, 0, tok_delim, &save_buf);
if (tok.len <= pass_len)
strlcpy(pass, tok.data, tok.len+1);
} else if (!strncmp("machine", tok.data, tok.len) || !strncmp("default", tok.data, tok.len)) {
save_ptr->data -= tok.len;
save_ptr->len += tok.len;
save_buf.data -= tok.len;
save_buf.len += tok.len;
break;
}
tok = memtok(NULL, 0, tok_delim, save_ptr);
tok = memtok(NULL, 0, tok_delim, &save_buf);
}
}

netrc_t *
netrc_init(const char *file, const char *host, char *user, size_t user_len, char *pass, size_t pass_len)
netrc_init(const char *file)
{
netrc_t *netrc;

if (!host || !user || !pass || !user_len || !pass_len)
return NULL;
netrc = calloc(1, sizeof(netrc_t));
if (!netrc)
return NULL;
netrc->file = file;
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netrc->host = host;
netrc->user = user;
netrc->user_len = user_len;
netrc->pass = pass;
netrc->pass_len = pass_len;
return netrc;
}

int
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netrc_parse(netrc_t *netrc)
netrc_parse(netrc_t *netrc, const char *host, char *user, size_t user_len, char *pass, size_t pass_len)
{
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size_t sz;
char *s_addr = NULL;
buffer_t tok, save_ptr;

if (!(sz = netrc_mmap(netrc->file, &s_addr)))
return 0;
tok = memtok(s_addr, sz, tok_delim, &save_ptr);
tok = memtok(s_addr, sz, tok_delim, &save_buf);
while (tok.len) {
if (!strncmp("default", tok.data, tok.len)) {
get_creds(netrc, tok, &save_ptr);
get_creds(netrc, user, user_len, pass, pass_len);
break;
} else if (!strncmp("machine", tok.data, tok.len)) {
tok = memtok(NULL, 0, tok_delim, &save_ptr);
if ((tok.len && !strncmp(netrc->host, tok.data, tok.len))) {
get_creds(netrc, tok, &save_ptr);
tok = memtok(NULL, 0, tok_delim, &save_buf);
if ((tok.len && !strncmp(host, tok.data, tok.len))) {
get_creds(netrc, user, user_len, pass, pass_len);
break;
}
}
tok = memtok(NULL, 0, tok_delim, &save_ptr);
tok = memtok(NULL, 0, tok_delim, &save_buf);
}
munmap(s_addr, sz);
return 1;
Expand Down
9 changes: 2 additions & 7 deletions src/netrc.h
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Expand Up @@ -39,15 +39,10 @@

typedef struct {
const char *file;
const char *host;
char *user;
size_t user_len;
char *pass;
size_t pass_len;
} netrc_t;

netrc_t *netrc_init(const char *file, const char *host, char *user, size_t user_len, char *pass, size_t pass_len);
int netrc_parse(netrc_t *netrc);
netrc_t *netrc_init(const char *file);
int netrc_parse(netrc_t *netrc, const char *host, char *user, size_t user_len, char *pass, size_t pass_len);
void netrc_close(netrc_t *netrc);

#endif /* AXEL_NETRC_H */
11 changes: 5 additions & 6 deletions src/text.c
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Expand Up @@ -163,13 +163,12 @@ main(int argc, char *argv[])
}
break;
case 'R':
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Let's define a negative version, it's necessary for if there's a default in the axel config file. I'm not sure a short version is needed (I've been thinking about removing support for systems not supporting getopt_long anyway).

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About negative version of the option, I don't know whether it is a good idea to make .netrc parsing default, as it may break existing users' assumptions/scripts/workflows, etc. What do you think about it?

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I don't mean to make it the default, but if you have the option on the configuration file, then you need a way to disable it from the command line.

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Ok, I'll add it.

conf->use_netrc = 1;
if (optarg) {
if (!strlcpy(conf->netrc_filename, optarg,
sizeof(conf->netrc_filename))) {
print_help();
goto free_conf;
{
char *netrc_filename = NULL;
if (optarg) {
netrc_filename = optarg;
}
conf->netrc = netrc_init(netrc_filename);
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}
break;
case '6':
Expand Down