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-rw-r--r--src/spf.c647
1 files changed, 647 insertions, 0 deletions
diff --git a/src/spf.c b/src/spf.c
new file mode 100644
index 0000000..2b61ba1
--- /dev/null
+++ b/src/spf.c
@@ -0,0 +1,647 @@
+#include "stralloc.h"
+#include "alloc.h"
+#include "ip.h"
+#include "ipalloc.h"
+#include "ipme.h"
+#include "str.h"
+#include "fmt.h"
+#include "scan.h"
+#include "byte.h"
+#include "now.h"
+#include "dns.h"
+#include "case.h"
+#include "spf.h"
+
+/* long lived SPF variables (output) */
+
+stralloc spfinfo = {0}; /* SPF results - see spf.h */
+stralloc spfrecord = {0}; /* Used for diagnostics */
+
+/* s/qmail control SPF variables (input) */
+
+stralloc spflocalrules; /* Local rules provided here */
+stralloc spfexplain; /* Default SPF_EXPMSG in spf.h */
+
+stralloc spfmf = {0}; /* aka envelopefrom = clientid */
+stralloc spfhelo = {0}; /* helo or domain part for spfmf */
+stralloc dnsname = {0}; /* FQDN of client host in DNS */
+stralloc spflocal = {0}; /* Receiving host */
+
+stralloc spfexpmsg = {0}; /* additional explanation given as 5xx SMTP response */
+stralloc expdomain = {0}; /* the domain, for which explanation is given */
+int flagip6;
+
+stralloc domain = {0};
+stralloc identity = {0};
+
+static int recursion;
+char ip4remote[4] = {0, 0, 0, 0};
+char ip6remote[16] = {16 * 0};
+
+/* Sample SPF TXT records:
+Standard example: example.net TXT "v=spf1 mx a:pluto.example.net include:aspmx.googlemail.com -all"
+Fehcom's example: fehcom.net TXT "v=spf1 ip4:85.25.149.179/32 ip6:2001:4dd0:ff00:3d4::2/64 -all"
+Include example: mailing.com TXT "v=spf1 a:smtpout.mailing.com include:spf.nl2go.com ~all"
+Exists+Expand: exists.com TXT "v=spf1 exists:%{ir}.%{l1r+-}._spf.%{d} -all"
+*/
+
+/* Entry point: -------------------------------------- Go for SPF */
+
+/**
+ @brief spf_query
+ prepares the SPF TXT record query
+ @param input: pointer to remoteip, helo, mf, localhost, and flagIP6
+ @return int r = SPF return code
+ */
+
+
+int spf_query(const char *remoteip,const char *helo,const char *mf,const char *local,const int flagip)
+{
+ int at;
+ int r = SPF_INIT;
+ flagip6 = flagip;
+
+ if (!stralloc_copys(&spfinfo," ")) return SPF_NOMEM;
+
+ switch (flagip6) {
+ case -1: if (!spf_info("MLocal=",remoteip)) return SPF_NOMEM;
+ if (!spf_info("R:","+")) return SPF_NOMEM;
+ break;
+ case 0: if (!ip4_scan(remoteip,ip4remote)) return SPF_SYNTAX;
+ if (ipme_is4(ip4remote) == 1) {
+ if (!spf_info("MLocal=",remoteip)) return SPF_NOMEM;
+ if (!spf_info("R:","+")) return SPF_NOMEM;
+ return SPF_ME;
+ } break;
+ case 1: if (!ip6_scan(remoteip,ip6remote)) return SPF_SYNTAX;
+ if (ipme_is6(ip6remote) == 1) {
+ if (!spf_info("MLocal=",remoteip)) return SPF_NOMEM;
+ if (!spf_info("R:","+")) return SPF_NOMEM;
+ return SPF_ME;
+ } break;
+ }
+
+ if (helo && str_len(helo)) {
+ if (!stralloc_copys(&spfhelo,helo)) return SPF_NOMEM;
+ } else {
+ if (!stralloc_copys(&spfhelo,"unknown")) return SPF_NOMEM;
+ }
+ if (!stralloc_0(&spfhelo)) return SPF_NOMEM;
+
+ if (mf && str_len(mf)) {
+ if (!stralloc_copys(&spfmf,mf)) return SPF_NOMEM;
+ if (!stralloc_0(&spfmf)) return SPF_NOMEM;
+ at = str_rchr(spfmf.s,'@');
+ if (spfmf.s[at] == '@') {
+ if (!stralloc_copys(&domain,spfmf.s + at + 1)) return SPF_NOMEM;
+ } else {
+// if (!stralloc_0(&spfhelo)) return SPF_NOMEM;
+ if (!stralloc_copys(&domain,&spfhelo)) return SPF_NOMEM;
+ }
+ if (!stralloc_copy(&identity,&domain)) return SPF_NOMEM;
+ }
+ if (!stralloc_0(&identity)) return SPF_NOMEM;
+
+ if (local && str_len(local)) {
+ if (!stralloc_copys(&spflocal,local)) return SPF_NOMEM;
+ } else {
+ if (!stralloc_copys(&spflocal,"localhost")) return SPF_NOMEM;
+ }
+ if (!stralloc_0(&spflocal)) return SPF_NOMEM;
+
+ if (!spf_info("S=",remoteip)) return SPF_NOMEM;
+ if (!spf_info("O=",spfmf.s)) return SPF_NOMEM;
+ if (!spf_info("C=",identity.s)) return SPF_NOMEM;
+ if (!spf_info("H=",spfhelo.s)) return SPF_NOMEM;
+
+ if (!stralloc_copy(&spfexpmsg,&spfexplain)) return SPF_NOMEM;
+ if (!stralloc_0(&spfexpmsg)) return SPF_NOMEM;
+
+ recursion = 0;
+ dnsname.len = 0;
+
+ if (r == SPF_INIT) r = spf_lookup(&domain);
+ if (r == SPF_LOOP) {
+ if (!spf_info("P=","Maximum nesting level exceeded; possible loop")) return SPF_NOMEM;
+ if (!spf_info("R:","e")) return SPF_NOMEM;
+ }
+ if (r < 0) r = SPF_UNKNOWN; /* return 2main */
+
+ return r;
+}
+
+/* SPF Lookup: -------------------------------------- Return cases */
+
+static struct spf_aliases {
+ char *alias;
+ int defrc;
+} spf_aliases[] = {
+ { "allow", SPF_OK }
+, { "pass", SPF_OK }
+, { "deny", SPF_FAIL }
+, { "softdeny",SPF_SOFTFAIL }
+, { "fail", SPF_FAIL }
+, { "softfail",SPF_SOFTFAIL }
+, { "unknown", SPF_NEUTRAL }
+, { 0, SPF_UNKNOWN }
+};
+
+/**
+ @brief spf_lookup
+ calles the actual (recursive) SPF DNS query
+ @param input: pointer to stralloc domain (fqdn)
+ @input stralloc spflocalrules (if provided -- for artificial results)
+ @output stralloc spfdata with RDATA (+ artificial information)
+ @return int r = SPF return code
+ */
+
+int spf_lookup(stralloc *domain)
+{
+ stralloc spfdata = {0};
+ stralloc sa = {0};
+ struct spf_aliases *da;
+ int first = !recursion;
+ int local_pos = -1;
+ int localrules = 0;
+ int q = -1;
+ int i, r;
+ int begin, pos;
+ int spfrc;
+ int done;
+ char *p;
+
+ /* Fallthrough result */
+
+ REDIRECT:
+ if (++recursion > LOOKUP_LIMIT) return SPF_EXHAUST;
+
+ if (!stralloc_copys(&expdomain,domain->s)) return SPF_NOMEM; // *FIXME */
+
+ if (!stralloc_copys(&spfdata,"")) return SPF_NOMEM;
+ r = spf_records(&spfdata,domain);
+
+ if (!stralloc_0(domain)) return SPF_NOMEM;
+ if (first) if (!stralloc_copys(&spfrecord,"")) return SPF_NOMEM;
+ if (!stralloc_cats(&spfrecord,"(")) return SPF_NOMEM;
+ if (!stralloc_cat(&spfrecord,domain)) return SPF_NOMEM;
+ if (!stralloc_cats(&spfrecord,")")) return SPF_NOMEM;
+ if (!stralloc_cats(&spfrecord," => ")) return SPF_NOMEM;
+ if (!stralloc_cat(&spfrecord,&spfdata)) return SPF_NOMEM;
+ if (!stralloc_cats(&spfrecord,"\n")) return SPF_NOMEM;
+ if (!stralloc_0(&spfrecord)) return SPF_NOMEM;
+
+ /* In spite of none-existing SPF data, use local rules as substitude */
+
+ if (r == SPF_NONE) { /* No SPF records published */
+ if (!first) {
+ return r;
+ } else {
+ spfdata.len = 0;
+ }
+ if (localrules) { /* append local ruleset */
+ local_pos = spfdata.len;
+ if (!stralloc_cats(&spfdata,spflocalrules.s)) return SPF_NOMEM;
+ }
+ if (!stralloc_0(&spfdata)) return SPF_NOMEM;
+
+ if (!stralloc_copys(&expdomain,"")) return SPF_NOMEM;
+
+ } else if (r == SPF_OK) { /* SPF records published */
+ if (!stralloc_0(&spfdata)) return SPF_NOMEM;
+ r = SPF_NEUTRAL;
+
+ if (first && localrules) { /* try to add local rules before failure of all mechs */
+ pos = 0;
+ p = (char *) 0;
+ while (pos < spfdata.len) {
+ NXTOK(begin,pos,&spfdata);
+ if (!spfdata.s[begin]) continue;
+
+ if (p && spfdata.s[begin] != *p) p = (char *) 0;
+ if (!p && (spfdata.s[begin] == '-' ||
+ spfdata.s[begin] == '~' ||
+ spfdata.s[begin] == '?')) p = &spfdata.s[begin];
+
+ if (p && p > spfdata.s && case_equals(spfdata.s + begin + 1,"all")) {
+ /* ok, we can insert the local rules at p */
+ local_pos = p - spfdata.s;
+
+ if (!stralloc_readyplus(&spfdata,spflocalrules.len)) return 0;
+ p = spfdata.s + local_pos;
+ byte_copyr(p + spflocalrules.len,spfdata.len - local_pos,p);
+ byte_copy(p,spflocalrules.len,spflocalrules.s);
+ spfdata.len += spflocalrules.len;
+
+ pos += spflocalrules.len;
+ break;
+ }
+ }
+
+ if (pos >= spfdata.len) pos = spfdata.len - 1;
+ for (i = 0; i < pos; i++)
+ if (!spfdata.s[i]) spfdata.s[i] = ' ';
+ }
+
+ } else { /* Any other SPF return code */
+ return r;
+ }
+
+ /* (artificial) SPF data exist; work thru them */
+
+ pos = 0;
+ done = 0;
+ while (pos < spfdata.len) {
+ NXTOK(begin,pos,&spfdata);
+ if (!spfdata.s[begin]) continue;
+
+ if (!done && localrules) { /* in local ruleset? */
+ if (local_pos >= 0 && begin >= local_pos) {
+ if (begin < (local_pos + spflocalrules.len)) {
+ if (!stralloc_copys(&expdomain,"")) return SPF_NOMEM;
+ } else {
+ if (!stralloc_copy(&expdomain,domain)) return SPF_NOMEM;
+ }
+ }
+ }
+
+ for (p = spfdata.s + begin; *p; ++p)
+ if (*p == ':' || *p == '/' || *p == '=') break;
+
+ if (*p == '=') {
+ *p++ = 0;
+
+ if (case_equals(spfdata.s + begin,"redirect")) { /* modifiers are simply handled here */
+ if (done) continue;
+
+// if (!stralloc_0(domain)) return SPF_NOMEM;
+ if (!spf_parse(&sa,p,domain->s)) return SPF_NOMEM;
+ if (!stralloc_copy(domain,&sa)) return SPF_NOMEM;
+ if (!spf_info("D=",p)) return SPF_NOMEM;
+ r = SPF_UNKNOWN;
+
+ goto REDIRECT;
+ } else if (case_equals(spfdata.s + begin,"default")) { /* we don't need those anymore */
+ if (done) continue;
+
+ for (da = spf_aliases; da->alias; ++da)
+ if (case_equals(da->alias,p)) break;
+
+ r = da->defrc;
+ } else if (case_equals(spfdata.s + begin,"exp")) { /* exp= only on top level */
+ stralloc out = {0};
+
+ if (!first) continue;
+ if (!stralloc_copys(&sa,p)) return SPF_NOMEM;
+
+ switch (dns_txt(&out,&sa)) {
+ case -1: return SPF_NOMEM;
+ case 0: continue; /* nobody @home */
+ }
+
+ if (!stralloc_copys(&spfexpmsg,out.s)) return SPF_NOMEM;
+ if (!stralloc_append(&spfexpmsg,"\n")) return SPF_NOMEM;
+ if (!stralloc_0(&spfexpmsg)) return SPF_NOMEM;
+ }
+ } else if (!done) { /* and unknown modifiers are ignored */
+ if (!stralloc_copys(&sa,spfdata.s + begin)) return SPF_NOMEM;
+ if (!stralloc_0(&sa)) return SPF_NOMEM;
+
+ switch (spfdata.s[begin]) {
+ case '-': begin++; spfrc = SPF_FAIL; break;
+ case '~': begin++; spfrc = SPF_SOFTFAIL; break;
+ case '+': begin++; spfrc = SPF_OK; break;
+ case '?': begin++; spfrc = SPF_NEUTRAL; break;
+ default: spfrc = SPF_OK;
+ }
+
+ if (*p == '/') {
+ *p++ = 0;
+ q = spf_mechanism(spfdata.s + begin,0,p,domain->s);
+ } else {
+ if (*p) *p++ = 0;
+ i = str_chr(p,'/');
+ if (p[i] == '/') {
+ p[i++] = 0;
+ q = spf_mechanism(spfdata.s + begin,p,p + i,domain->s);
+ } else if (i > 0) {
+ q = spf_mechanism(spfdata.s + begin,p,0,domain->s);
+ } else {
+ q = spf_mechanism(spfdata.s + begin,0,0,domain->s);
+ }
+ }
+ if (q == SPF_OK) q = spfrc;
+
+ switch (q) {
+ case SPF_OK: if (!spf_info("R:","+")) return SPF_NOMEM; break;
+ case SPF_NEUTRAL: if (!spf_info("R:","?")) return SPF_NOMEM; break;
+ case SPF_SYNTAX: if (!spf_info("P=","Unknown parse error")) return SPF_NOMEM;
+ if (!spf_info("R:","e")) return SPF_NOMEM; break;
+ case SPF_SOFTFAIL: if (!spf_info("R:","~")) return SPF_NOMEM; break;
+ case SPF_FAIL: if (!spf_info("R:","-")) return SPF_NOMEM; break;
+ case SPF_EXT: if (!spf_info("P=","Unknown SPF mechanism")) return SPF_NOMEM; break;
+ case SPF_ERROR: if (localrules) if (local_pos >= 0 && begin >= local_pos) break;
+ if (!spf_info("R:","o")) return SPF_NOMEM; q = SPF_NONE; break;
+ case SPF_NONE: continue;
+ }
+
+ r = q;
+ done = 1; /* we're done, no more mechanisms */
+ }
+ }
+
+ /* we fell through, no local rule applied */
+ if (!done)
+ if (!stralloc_copy(&expdomain,domain)) return SPF_NOMEM;
+
+ return r;
+}
+
+/* Mechanisms: -------------------------------------- Lookup classes */
+
+static struct mechanisms {
+ char *mechanism;
+ int (*func)(char *spfspec,char *prefix);
+ unsigned int use_spfspec : 1;
+ unsigned int use_prefix : 1;
+ unsigned int expands : 1;
+ unsigned int filldomain : 1;
+ int defresult : 4;
+} mechanisms[] = {
+ { "all", 0, 0,0,0,0,SPF_OK }
+, { "include", spf_include,1,0,1,0,0 }
+, { "a", spf_a, 1,1,1,1,0 }
+, { "mx", spf_mx, 1,1,1,1,0 }
+, { "ptr", spf_ptr, 1,0,1,1,0 }
+, { "ip4", spf_ip4, 1,1,0,0,0 }
+, { "ip6", spf_ip6, 1,1,0,0,0 }
+, { "exists", spf_exists, 1,0,1,0,0 }
+, { "extension",0, 1,1,0,0,SPF_EXT }
+, { 0, 0, 1,1,0,0,SPF_EXT }
+};
+
+/**
+ @brief spf_mechanism
+ evaluates the provided mechanisms in the SPF record [RFC7208 Sec 5.]
+ @param input: pointer to mechanism, SPF specification from record, CIDR prefix length, domain
+ @input stralloc spflocalrules (if provided)
+ @output pointer to spfspec: data evaluated
+ @return int r
+ */
+
+int spf_mechanism(char *mechanism,char *spfspec,char *prefix,char *domain)
+{
+ struct mechanisms *mech;
+ stralloc sa = {0};
+ int r;
+ int pos;
+
+ for (mech = mechanisms; mech->mechanism; mech++)
+ if (case_equals(mech->mechanism,mechanism)) break;
+
+ if (mech->use_spfspec && !spfspec && mech->filldomain) spfspec = domain;
+ if (!mech->use_spfspec != !spfspec) return SPF_SYNTAX;
+ if (mech->use_prefix && !get_prefix(prefix)) return SPF_SYNTAX;
+
+ if (!mech->func) return mech->defresult;
+ if (!stralloc_readyplus(&sa,1)) return SPF_NOMEM;
+
+ if (mech->expands && case_diffs(spfspec,domain)) {
+ if (!spf_parse(&sa,spfspec,domain)) return SPF_NOMEM;
+ for (pos = 0; (sa.len - pos) > 255;) {
+ pos += byte_chr(sa.s + pos,sa.len - pos,'.');
+ if (pos < sa.len) pos++;
+ }
+ sa.len -= pos;
+ if (pos > 0) byte_copy(sa.s,sa.len,sa.s + pos);
+ if (!stralloc_0(&sa)) return SPF_NOMEM;
+ spfspec = sa.s;
+ }
+
+ r = mech->func(spfspec,prefix);
+ return r;
+}
+
+/**
+ @brief spf_include
+ deals with recursive evaluation of SPF record [RFC7208 Sec. 5.2]
+ @param input: pointer to included SPF specification; CIDR prefix length
+ @return int r = 1 ok; 0 failure
+ */
+
+int spf_include(char *spfspec,char *prefix)
+{
+ stralloc sa = {0};
+ int r;
+
+ if (!stralloc_copys(&sa,spfspec)) return SPF_NOMEM;
+
+ r = spf_lookup(&sa);
+ switch (r) {
+ case SPF_NONE: r = SPF_UNKNOWN; break;
+ case SPF_SYNTAX: r = SPF_UNKNOWN; break;
+ case SPF_NEUTRAL:
+ case SPF_SOFTFAIL:
+ case SPF_FAIL: r = SPF_NONE; break;
+ }
+ if (!stralloc_0(&sa)) return SPF_NOMEM;
+ if (!spf_info("I=",sa.s)) return SPF_NOMEM;
+
+ return r;
+}
+
+/**
+ @brief spf_parse
+ parses the substructure of the SPF record and calls spf_macros
+ @param input: pointer to SPF specification, pointer to domain
+ output: stralloc sa --
+ @output pointer to spfspec: with found data
+ @return int r = 1 ok; 0 failure
+ */
+
+int spf_parse(stralloc *sa,char *spfspec,char *domain)
+{
+ char *p;
+ int pos;
+ char append;
+
+ if (!stralloc_readyplus(sa,3)) return 0;
+ if (!stralloc_copys(sa,"")) return 0;
+
+ for (p = spfspec; *p; ++p) {
+ append = *p;
+ if (byte_equal(p,1,"%")) {
+ p++;
+ switch (*p) {
+ case '%': break;
+ case '_': append = ' '; break;
+ case '-': if (!stralloc_cats(sa,"%20")) return 0; continue;
+ case '{':
+ pos = str_chr(p,'}');
+ if (p[pos] != '}') { p--; break; }
+ p[pos] = '\0';
+ if (!spf_macros(sa,p + 1,domain)) return 0;
+ p += pos;
+ continue;
+ default: p--;
+ }
+ }
+ if (!stralloc_append(sa,&append)) return 0;
+ }
+
+ return 1;
+}
+
+/**
+ @brief spf_macros
+ deals with macros in the SPF specificaton [RFC7208 Sec. 7ff]
+ @param input: pointer to SPF macro, pointer to domain
+ output: pointer to stralloc expand(ed information)
+ @return int r = 1 ok; 0 failure
+ */
+
+int spf_macros(stralloc *expand,char *macro,char *domain)
+{
+ static const char hextab[] = "0123456789abcdef";
+ stralloc sa = {0};
+ int reverse = 0;
+ int ndigits = -1;
+ int urlencode;
+ unsigned long u;
+ char ch = {0};
+ char ascii;
+ int pos, i, n;
+ int start = expand->len;
+
+ /* URL encoding - hidden in RFC 7208 Sec. 7.3 */
+
+ if (*macro == 'x') { urlencode = -1; ++macro; } else urlencode = 0;
+ ch = *macro;
+ if (!ch) { return 1; }
+ if (ch >= 'A' && ch <= 'Z') { ch += 32; urlencode = 1; }
+ if (urlencode == -1) ch -= 32;
+
+ /* No. digits determine number of printed labels */
+
+ i = 0;
+ while (*macro) {
+ i++;
+ if (*macro == '}') break;
+ if (*macro >= '0' && *macro <= '9') {
+ scan_ulong(macro,&u); ndigits = u;
+ } else if (i > 1 && *macro == 'r') { reverse = 1; break; } /* Reverse representation */
+ macro++;
+ }
+
+ switch (ch) { /* see RFC7208 sec. 7.2 */
+ case 's': case 'S':
+ if (!stralloc_readyplus(&sa,spfmf.len)) return 0;
+ if (!stralloc_copys(&sa,spfmf.s)) return 0;
+ break;
+ case 'l': case 'L':
+ i = byte_rchr(spfmf.s,spfmf.len,'@');
+ if (i < spfmf.len) {
+ if (!stralloc_copyb(&sa,spfmf.s,i)) return 0;
+ } else {
+ if (!stralloc_copys(&sa,"postmaster")) return 0;
+ }
+ break;
+ case 'o': case 'O':
+ i = byte_rchr(spfmf.s,spfmf.len,'@') + 1;
+ if (i > spfmf.len) break;
+ if (!stralloc_copys(&sa,spfmf.s + i)) return 0;
+ break;
+ case 'd': case 'D':
+ if (!stralloc_copys(&sa,domain)) return 0; /* the hack for 'Z'; Russions everywhere ;-) */
+ break;
+ case 'i': case 'c': case 'I': case 'C':
+ if (!stralloc_ready(&sa,IPFMT)) return 0;
+ if (flagip6) {
+ sa.len = ip6_fmt(sa.s,ip6remote);
+ } else {
+ sa.len = ip4_fmt(sa.s,ip4remote);
+ }
+ break;
+ case 'p': case 'P':
+ if (!dnsname.len) spf_ptr(domain,0);
+ if (dnsname.len) {
+ if (!stralloc_copys(&sa,dnsname.s)) return 0;
+ } else {
+ if (!stralloc_copys(&sa,"unknown")) return 0;
+ }
+ break;
+ case 'h': case 'H':
+ if (!stralloc_copys(&sa,spfhelo.s)) return 0; /* FIXME: FQDN? */
+ break;
+ case 't': case 'T':
+ if (!stralloc_ready(&sa,FMT_ULONG)) return 0;
+ sa.len = fmt_ulong(sa.s,(unsigned long)now());
+ break;
+ case 'v': case 'V':
+ if (flagip6) {
+ if (!stralloc_copys(&sa,"ip6")) return 0;
+ } else {
+ if (!stralloc_copys(&sa,"in-addr")) return 0;
+ }
+ break;
+ case 'r': case 'R':
+ if (!stralloc_copy(&sa,&spflocal)) return 0;
+ break;
+ default: break;
+ }
+ if (!stralloc_0(&sa)) return 0; // XXX
+
+ if (reverse) {
+ n = 0;
+ for (i = 1; i <= sa.len; i++) {
+ if ((ndigits == -1) || (n < ndigits)) {
+ if (!byte_diff(sa.s + sa.len - i - 1,1,".") || (i == sa.len)) {
+ n++;
+ if (!stralloc_cats(expand,sa.s + sa.len - i)) return 0;
+ if (i < sa.len) {
+ sa.s[sa.len - i - 1] = 0;
+ if (!stralloc_cats(expand,".")) return 0;
+ }
+ }
+ }
+ }
+ } else if (ndigits != -1) {
+ n = pos = 0;
+ for (i = 1; i <= sa.len; i++) {
+ if (n < ndigits) {
+ if (!byte_diff(sa.s + i,1,".")) { n++; pos = i; }
+ }
+ }
+ if (!stralloc_catb(expand,sa.s,pos)) return 0;
+ } else
+ if (!stralloc_cats(expand,sa.s)) return 0;
+
+ if (urlencode) {
+ stralloc_copyb(&sa,expand->s + start,expand->len - start);
+ expand->len = start;
+
+ for (i = 0; i < sa.len; ++i) {
+ ch = sa.s[i];
+ if (urlchr_table[(unsigned char)ch]) {
+ if (!stralloc_readyplus(expand,3)) return 0;
+ if (!stralloc_append(expand,"%")) return 0;
+ ascii = hextab[(unsigned char)ch >> 4];
+ if (!stralloc_append(expand,&ascii)) return 0;
+ ascii = hextab[(unsigned char)ch & 0x0f];
+ if (!stralloc_append(expand,&ascii)) return 0;
+ } else {
+ if (!stralloc_append(expand,&ch)) return 0;
+ }
+ }
+ }
+
+ return 1;
+}
+
+int spf_info(char *s,const char *t)
+{
+ if (!stralloc_cats(&spfinfo,s)) return 0;
+ if (!stralloc_cats(&spfinfo,t)) return 0;
+ if (!stralloc_cats(&spfinfo," ")) return 0;
+
+ return 1;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-22 07:47:56 +0000